COVANCE INC
10-K, 1997-03-28
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-K

                  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                         OF THE SECURITIES EXCHANGE ACT OF 1934 
                           For the fiscal year ended
                                December 31, 1996

                         Commission File Number: 1-12213

                                  COVANCE INC.
             (Exact name of Registrant as specified in its Charter)

                  Delaware                    22-3265977
          (State of Incorporation) (I.R.S. Employer Identification No.)

          210 Carnegie Center, Princeton, New Jersey      08540
           (Address of Principal Executive Offices)    (Zip Code)

Registrant's telephone number, including area code:  (609) 452-4400

Securities registered pursuant to Section 12(b) of the Act:
                                                    Name of each Exchange
             Title of each Class                    on which Registered
         ____________________________             ________________________
         Common Stock, $.01 Par Value             New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the Registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. YES  X   NO
                                       ___     ___

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of the Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.  X
                             ___

As of March 3, 1997, the aggregate market value of the voting stock held by
non-affiliates of the Registrant was $1,078,308,751 (based on the closing price
of the Company's Common Stock on the New York Stock Exchange on March 3, 1997 of
$19.25).

As of March 3, 1997, the Registrant had 56,087,500 shares of Common Stock
outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

                                      None


<PAGE>



                                     PART I


Item 1.  Business

General

      Covance Inc. ("Covance" or the "Company") is a leading contract research
organization ("CRO") providing a wide range of integrated product development
services on a worldwide basis to the biotechnology, pharmaceutical and medical
device industries. Covance also provides services such as health economics for
managed care organizations, hospitals and health care provider networks, and
early development and laboratory testing services to the chemical, agrochemical
and food industries. The services Covance provides constitute six lines of
business: preclinical, biomanufacturing, clinical and periapproval, central
laboratory, clinical packaging and health economics. These six lines of business
can be further categorized as non-clinical (preclinical and biomanufacturing)
and clinical (clinical and periapproval, central laboratory, clinical packaging
and health economics). Covance believes it is one of the largest
biopharmaceutical CROs, based on estimated 1996 annual net revenue, and one of a
few that are capable of providing comprehensive global product development
services.

      On May 13, 1996, the Board of Directors of Corning Incorporated
("Corning"), the Company's former indirect parent, approved a plan to distribute
(the "Distributions"), in a tax free distribution to all Corning stockholders of
record as of 11:59 PM on December 31, 1996, all of the Company's outstanding
Common Stock, and that of Quest Diagnostics Inc. ("Quest"). The Distributions
were effected as of the close of December 31, 1996 (the "Distribution Date") and
the Company (as well as Quest) became an independent, publicly-traded company on
such date.

      Covance's businesses were initially acquired by its former parent,
Corning, as part of a strategy to create a global, integrated and full service
product development company. In 1987, Corning acquired Hazleton Corporation (now
known as Covance Laboratories Inc.), owner of preclinical drug safety assessment
laboratories and Phase I clinical research units. In 1989, Phase II and Phase
III clinical trials expertise was added with G.H. Besselaar Associates (now
known as Covance Clinical and Periapproval Services Inc.), and Covance further
expanded its clinical trials expertise in 1990 with the purchase of PACT Inc.
(now known as Covance Clinical and Periapproval Services Inc.), a periapproval
studies company. In 1991, SciCor Inc. (now known as Covance Central Laboratories
Inc.), a clinical laboratory dedicated to the drug development process was
purchased. Covance's pharmaceutical laboratory capabilities were expanded in
1992 with the creation in Switzerland of a jointly owned company, SciCor S.A.
Covance acquired 100% of this company in 1994. Also in 1994, the Company
acquired a significant minority equity interest in Bio-Imaging Technologies Inc.
("Bio-Imaging"), which uses proprietary imaging technology to quantify the
diagnostic and therapeutic effectiveness of experimental drugs and devices. In
1995, Covance acquired National Packaging 

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<PAGE>

Systems, Inc. ("National Packaging") (now known as Covance Pharmaceutical
Packaging Services Inc.), a clinical packaging company. Also in 1995, Covance
formed Covance Biotechnology Services Inc. ("Covance Biotechnology"), a
majority-owned company which will enable Covance to engage in biomanufacturing.

      In early 1996, Covance purchased Health Technology Associates Inc. ("HTA")
(now known as Covance Health Economics and Outcomes Services Inc.), a health
economics company. In October 1996, Covance expanded its clinical packaging
capabilities to Europe with the purchase of Swiss-based CRS Pacamed AG ("CRS
Pacamed") (now known as Covance Pharmaceutical Packaging Services A.G.). In
addition, Covance acquired a 91,000 square-foot facility in Horsham, United
Kingdom, which will be used, among other things, to enhance the Company's
ability to provide clinical packaging services in Europe, and serve as the
Company's European headquarters.

      The Company maintains offices in 15 countries, including offices in
Singapore and Canada, which opened in 1996.

CRO Industry Overview

      The CRO industry provides independent product development services to the
pharmaceutical, biotechnology and medical device industries. In general, CROs
derive substantially all of their revenue from the research and development
expenditures of such industries. Today, there are only a few full-service
companies. Full-service CROs design and manage preclinical and clinical and
periapproval studies and trials, provide health economic services, and provide
packaging and central laboratory services and other services required to develop
and market new products in accordance with applicable government regulations in
the jurisdictions where the services are provided, including the regulations of
the FDA in the United States.

Trends Affecting the CRO Industry

      Covance believes that the outsourcing of drug development activities by
pharmaceutical and biotechnology companies has been increasing and will continue
to increase as a result of a number of factors, as further described below.

      Cost Containment Pressures. Market forces and governmental initiatives
have placed significant downward pressure on pharmaceutical and biotechnology
companies' drug prices. Covance believes that the pharmaceutical industry is
responding to these pressures by downsizing its research and development
infrastructure and converting the fixed costs of maintaining such infrastructure
to variable costs by outsourcing drug development activities to CROs. The
downsizing of development capabilities also creates demand for CROs as
biopharmaceutical companies experience internal development resource shortages
when a large number of compounds emerge from the research process and need to
undergo development. Management also believes that many of these companies are


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<PAGE>

attempting to decrease the new drug development cycle by using CROs, which may
have greater expertise in the therapeutic area, while offering greater
efficiency at a lower cost.

      Marketplace Globalization. Pharmaceutical and biotechnology companies are
increasingly attempting to expand the market for new drugs by pursuing
regulatory approvals in multiple countries simultaneously rather than
sequentially as they have in the past. Covance believes that CROs with a global
presence will continue to benefit from these trends, and that it is
well-positioned to benefit from such trends.

      Revenue Enhancement Through Faster Drug Development. Covance believes that
CROs, by providing specialized development services, are often able to perform
the needed services with a higher level of expertise or specialization, and more
quickly, than a pharmaceutical or biotechnology company could perform such
services internally.

      Consolidation in the Pharmaceutical Industry. The pharmaceutical industry
is consolidating as such companies seek to obtain cost reduction synergies
through business combinations. Once consolidated, many pharmaceutical companies
aggressively manage costs by reducing jobs, decentralizing the research and
development process, and outsourcing to CROs in an effort to reduce the fixed
costs associated with internal drug development.

      Increasingly Stringent Regulation. Increasingly stringent regulatory
requirements throughout the world and their standardization have increased the
need for broader, global regulatory expertise. Covance believes that the
pharmaceutical and biotechnology industries are outsourcing to global CROs to
take advantage of their capabilities and geographic presence.

      Therapeutic Focus. Management believes that the economics of the
marketplace require increased research and development expenditures as
biopharmaceutical companies become focused on innovative new products, including
drugs for an aging population, and drugs for the treatment of chronic disorders
and life threatening conditions. The development of therapies for chronic
disorders, such as Alzheimer's disease or arthritis, requires complex clinical
trials to demonstrate the therapies effectiveness and to determine whether the
drug causes any long-term side effects. Management believes that CROs with the
requisite therapeutic experience and the ability to manage complex trials will
present an attractive development alternative for biopharmaceutical companies.

      Biotechnology Industry Growth. The United States biotechnology industry
has grown rapidly over the last 10 years and is introducing new therapies which
require regulatory approval. Many biotechnology companies do not have the
necessary internal resources and experience (capital, equipment or people) to
conduct preclinical studies and clinical trials. Accordingly, many biotechnology
companies have chosen to outsource to CROs rather than expend significant time
and resources to develop an internal preclinical or clinical development or
biomanufacturing capability. 


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<PAGE>

The New Drug Development Process-Overview

      Before a new drug may be marketed to the public, it must undergo extensive
testing and regulatory review to determine that the drug is both safe and
effective for its intended purpose. The developmental process and typical
corresponding time periods are as set forth below. Similar extensive testing and
regulatory reviews are required in Europe and some Asian countries to determine
that a new drug is safe and effective for its intended purpose before it can be
marketed to the public.

      Preclinical Research (6 months to 3 years). In vitro ("test tube") and in
vivo ("animal") studies are conducted to establish the basic pharmacokinetic
effect and safety of a drug including the toxicity of the drug over a wide range
of doses. Initially, acute toxicology studies are conducted. In the United
States, if results warrant continuing development of the drug, the manufacturer
(also known as the "sponsor") will file an Investigational New Drug Application
("IND"), whereupon the Food and Drug Administration ("FDA") may grant permission
to begin human trials (also known as "clinical trials"). Preclinical studies may
continue after the start of clinical trials to determine the longer term effects
of a product.

         Clinical Trials (3.5 to 6 years).

      o  Phase I (6 months to 1 year). This phase involves the initial basic
         safety and pharmacology testing in approximately 20 to 100 human
         subjects, usually healthy volunteers in a closely monitored setting,
         including studies to determine the side effect profile of the drug, how
         the drug works, how it is affected by other drugs, where it goes in the
         body, how long it remains active, and how it is broken down and
         eliminated from the body.

      o  Phase II (1 to 2 years). This phase involves basic efficacy
         (effectiveness) and dose-range testing in approximately 100 to 400
         carefully selected patients suffering from the disease or condition
         under study to help determine the best effective dose, confirm that the
         drug works as expected, and provide additional safety data. The trials
         are typically well controlled and usually involve a placebo, also known
         as a "sugar pill." A placebo is an identical tablet or solution which
         lacks the active substance under investigation.

      o  Phase III (2 to 3 years). This phase involves efficacy and safety
         studies in broader populations of hundreds or thousands of patients at
         many investigational sites (hospitals and clinics) and may involve
         placebo-controlled trials, in which the new drug is compared with a
         placebo; studies comparing the new drug with one or more drugs with
         established safety and efficacy profiles in the same therapeutic
         category; or studies where there is no comparison to a placebo or
         another drug ("uncontrolled" trials). Generally, Phase III studies are
         intended to provide additional information on drug safety and efficacy,
         an evaluation of the risk-benefit relationship for the drug, and
         information for the adequate labeling of the product.


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<PAGE>

      NDA Preparation and Submission. Upon completion of Phase III trials, the
sponsor or CRO assembles the tabulated and statistically analyzed data from all
phases of development into a single large document, the New Drug Application
("NDA"), which comprises, on average, approximately 100,000 pages.

      FDA Review and Approval (1 to 2 years). At this stage, the FDA will
scrutinize data from all phases of development to confirm that the sponsor has
complied with regulations and that the drug is safe and effective for the
specific use (or "indication") under study. Product labeling is also approved at
this stage, which serves as a guideline to the sponsor about how its product can
be promoted in the marketplace.

      Treatment Investigational New Drug (May span late Phase II, Phase III, and
FDA review). When results from Phase II or Phase III show special promise in the
treatment of a serious condition for which existing therapeutic options are
limited or of minimal value, the FDA may allow the manufacturer to make the new
drug available to a larger number of patients through the regulated mechanism of
a treatment investigational new drug ("TIND") application. Although less
scientifically rigorous than a controlled clinical trial, a TIND may enroll and
collect primarily safety data from thousands of patients.

      Post-Marketing Surveillance and Phase IV Studies (Periapproval). Federal
regulation requires the sponsor to collect and periodically report to the FDA
additional safety and efficacy data on the drug for as long as the sponsor
markets the drug (post-marketing surveillance). If the drug is marketed outside
the United States, these reports must include data from all countries in which
the drug is sold. Additional studies (Phase IV) may be undertaken after initial
approval to find new uses for the drug or to test new dosage formulations. All
of these studies are types of "periapproval" studies.

Business Strategy

      Based on 1996 net revenues, Covance believes it is one of the largest CROs
serving the biotechnology and pharmaceutical industries. The Company has a
focused strategy to provide high quality, cost effective, integrated,
comprehensive and innovative services to assist its pharmaceutical and
biotechnology clients to develop, produce, obtain approval for and enhance the
commercial success of their new therapeutic products worldwide.

      Services. Covance believes that CROs capable of offering a full range of
biopharmaceutical drug development and manufacturing services are better able to
compete for three reasons: (1) a full range of services provides a client with
the choice of using just one provider to secure all of the client's development
needs; (2) an integrated provider of these services can provide economies of
scale and accelerate the development of the client's product through more
comprehensive planning of the development process; and (3) early stage
development provides the CRO with access to the client sooner in the development
cycle and may promote the client's use of later stage development services.


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<PAGE>

      As part of its strategy, Covance both continually improves its existing
services and endeavors to create new ones. Covance has implemented a total
quality management system throughout its operations which assists the Company in
its goal of producing error-free services on time and within the client's
budget. This management system is overseen by a quality team comprised of
Covance's most senior executives, including its chief executive officer.
Furthermore, certain of Covance's United States and European subsidiaries have
received ISO 9000 and 9001 certifications based on quality standards established
by the International Organization for Standardization. The ISO 9000 standards
define the international requirements for creating a quality assurance system
that will result in providing consistent service.

      Covance also developed the Expanded Access Program ("EAP"), one of
Covance's periapproval offerings. EAP is a mechanism that allows innovative new
therapies for life threatening diseases to be given to expanded populations
prior to FDA approval pursuant to a TIND application. In addition to improving
its existing services, Covance also focuses on providing its clients new market
oriented, value-added services, including those that involve integrated services
relying on multidisciplinary teams drawn from various Covance operating units or
divisions. For instance, Covance is duplicating in the United States a Strategic
Product Development ("SPD") program developed in Europe that has successfully
reduced the estimated time from preclinical testing to the first human studies.

      Covance's new service offerings arise as a result of both "home-grown"
activities and through strategic acquisitions. With respect to the former, in
addition to SPD, Covance has invested in the creation of a multi-use
biomanufacturing facility, Covance Biotechnology. With respect to the latter,
Covance added domestic clinical packaging capabilities through the acquisition
of National Packaging in January 1995, European clinical packaging capabilities
through the acquisition of CRS Pacamed in October 1996, and enhanced its health
economics services by acquiring HTA in March 1996. Covance expects to continue
developing services internally and making strategic acquisitions that are
complementary to its existing services and that will expand its capability to
serve its clients.

      Streamlining the Drug Development Process. In recognition of its clients
needs with respect to cost containment, reduced testing time frames and global
trials, Covance has also created a dedicated team focused exclusively on
continually examining and redesigning the drug development process with the
objective of reducing the time required to develop a new compound. The mandate
of this team is to examine every significant process, system and information
technology used in product development, with the objective of applying the
considerable experience and technical resources available throughout the
Company. Covance has over 300 information systems professionals working in 12
regional information system centers (nine in the United States and three in
Europe) and nine satellite centers (five in the United States and four in
Europe). All of the Company's employees at its 33 locations (both domestic and


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<PAGE>

international) and miniframe computers and thousands of desktop computers are
connected by a wide area network that provides global access to the expertise
and technologies resident in the regional information system centers. These
systems also support the Company's ability to provide integrated services and
connect the Company to its clients. For instance, Covance's development of its
Information Access System permits clients to obtain real time access to their
study data, and its drug supply management system based on Integrated Voice
Response technology allows clients to more efficiently manage the distribution
of their experimental compounds to investigational sites. In examining ways to
improve the drug developmental process, Covance's information technology
strategy is to capitalize on its existing heterogeneous, flexible and
proprietary computer systems, and to both customize them where appropriate for
particular client needs and incorporate new systems and technologies to meet
changing demands in a timely and cost effective manner.

      Geographic Expansion. Covance believes that it will become increasingly
important to provide its full range of drug research and development services in
all major and developing biotechnology and pharmaceutical markets, especially
given industry trends to conduct research on new drugs outside the United States
first and to conduct clinical trials in multiple countries simultaneously.
Through its offices, regional monitoring sites, laboratories and manufacturing
sites in over 33 locations in 15 different countries and field work in over 30
other countries, Covance believes it is a leader among CROs in its ability to
deliver services globally. Currently, approximately 30% of Covance's 5,400
employees are based outside of the United States.

      Covance will continue its strategy of establishing new or enhancing
existing operations in significant biotechnology and pharmaceutical markets.
Covance expects this will occur as a result of internal growth and through
strategic acquisitions. In April 1996, Covance opened its Singapore office.
Singapore will serve as Covance's center for conducting clinical trials in Asia,
a region that Covance believes will be increasingly important for the research,
development and therapeutic use of drugs. Covance is also collaborating with the
Singapore National Science and Technology Board concerning the Singapore
government's initiative to form the Asia Pacific Economic Cooperation
coordinating center for Good Clinical Practice. In December 1996, Covance opened
an office in Montreal, Canada, to serve the pharmaceutical and biotechnology
markets and to have further access to patients. Covance is also discussing with
its clients opening new offices in Latin America and Africa to serve their
growing need to conduct drug development studies in these regions.

Services

      Covance provides a wide range of integrated product development services
on a worldwide basis to the biotechnology, pharmaceutical and medical device
industries. In addition and to a lesser extent, Covance provides services such
as health economics for managed care organizations, hospitals and health care
provider networks, and early development and laboratory testing services to the
chemical, agrochemical and food 


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<PAGE>

industries. The services Covance provides constitute six lines of business:
preclinical, biomanufacturing, clinical and periapproval, central laboratory,
clinical packaging and health economics.

Preclinical Services

      Covance has four major laboratories, employing over 1,900 people, located
in Madison, Wisconsin, Vienna, Virginia, Harrogate, United Kingdom, and Munster,
Germany. The Company also has an administrative office in Tokyo, Japan. The
preclinical services offered are wide-ranging, including in vivo toxicology
studies (such as acute, subchronic and carcinogenicity studies), genetic
toxicology studies (such as in vitro cytotoxicity, cytogenetics and gene
mutation studies and transgenic mouse models) and chemistry services (such as in
vitro metabolism, pharmacokinetics and bioequivalence studies).

      The preclinical area has also been a source of innovation by introducing
new technologies for client access to data, electronic animal identification,
multimedia study reports and data tables and in vivo and in vitro measures of
induced cell proliferation. Covance's preclinical group also works closely with
its Phase I and II groups to minimize product development time and to provide
clients with early data on the safety and efficacy of new molecules. This data
allows clients to make a decision about whether to continue, cease or modify
their development program.

      As part of its preclinical services, Covance is duplicating in the United
States an SPD program developed in Europe that has successfully reduced the time
from preclinical testing to the first human studies. SPD involves an integrated
process and team drawn from Covance's preclinical and Phase I and II areas. In
an SPD program, the compound is researched from initial preclinical evaluation
through its first dosing in humans, including the filing and attainment of an
IND application. Specific elements of the process include formulation and dose
delivery testing, product metabolism, chemistry, pharmacology, toxicology and
safety testing. The preclinical testing phase in the United States typically
takes six months to three years and Phase I studies typically take six months to
one year. Because INDs are required in the United States to be filed before
human clinical trials start, it is uncertain whether SPD trial completion speeds
in the United States will be as swift as the Company's experiences with clients
in the United Kingdom (where INDs are not required to commence Phase I clinical
trials), but Covance believes that an SPD program can reduce the typical drug
development time in the United States.

      Covance also provides animals, including purpose-bred animals, for
biomedical research. These animals are used by biopharmaceutical companies,
university research centers and CROs, like Covance, as part of their preclinical
in vivo safety and efficacy testing. Through a variety of processes, technology
and specifically constructed facilities, Covance is able to provide both
purpose-bred and specific pathogen free animals that meets clients' rigorous
control requirements. Covance is also a provider of custom 


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polyclonal and monoclonal antibody services and owns and operates an 18,000
square-foot state-of-the-art antisera production facility that complies with
both good manufacturing practices ("GMP") and good laboratory practices ("GLP").

      Although Covance's animal breeding facilities maintain procedures in
accordance with applicable government regulations and Company policies for the
quarantine and handling of imported animals, including primates, there is a risk
that these animals may be infected with diseases that may be harmful and even
lethal to themselves and humans. In 1996, Covance, with the approval of the
Texas Department of Health and the Centers for Disease Control, destroyed a
shipment of monkeys from the Philippines because some had been infected with a
sub-strain of the Ebola-Reston virus, which is lethal to monkeys.

      Covance also provides early development and laboratory testing services to
the chemical, agrochemical and food industries. Covance offers a complete range
of services to agrochemical manufacturers to determine the potential risk to
humans, animals and the environment from plant protection products. Covance also
offers a broad range of services to the food industries, including nutritional
analysis and nutritional content fact labels.

Biomanufacturing

      Covance holds a majority interest in Covance Biotechnology, a company
formed in 1995 to manufacture peptides and recombinant proteins for
biotechnology and pharmaceutical clients in accordance with GMP for preclinical
and clinical trials as well as for commercial sales. Covance Biotechnology's
services include process development services, GMP manufacturing by microbial
and mammalian cell expression, laboratory testing, quality assurance and quality
control and regulatory affairs assistance. Covance Biotechnology is able to
process multiple compounds for multiple clients simultaneously and on a scale,
Covance believes, greater than any other contract bioprocessor. Covance
Biotechnology provides an alternative for clients who might otherwise need to
design, finance and construct their own facility to manufacture a compound for
preclinical or clinical trials or commercial sale. By retaining Covance
Biotechnology, a client can avoid the expense, time delay and risk of making
additional investments for a compound whose safety, efficacy and commercial
opportunities are uncertain. This allows clients to preserve their capital and
lower their risks.

      Covance Biotechnology has submitted proposals to a number of prospective
biopharmaceutical clients, and it has been awarded two contracts. For the year
ended December 31, 1996, Covance Biotechnology reported a net loss of
approximately $3.1 million. Cumulatively since its inception, Covance
Biotechnology has incurred net losses totaling $5.0 million.

      The 109,000 square-foot biomanufacturing facility, located in Research
Triangle Park, North Carolina, became "mechanically complete" in December 1996,
and became operational in January 1997, although the facility continues to
undergo validation. The 


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<PAGE>

biomanufacturing facility is financed through several tax retention operating
leases provided by a commercial lending institution ("Bank") and, during the
construction phase, was being leased by the General Contractor, before being
transferred to Covance Biotechnology upon the "mechanical completion" of the
facility. The leases expires in December 2006. The annual minimum lease payments
are $5.3 million. At the expiration of the lease term, Covance Biotechnology is
liable for the unamortized balance of the cost of the facility, currently
estimated to be approximately $37 million. Covance Biotechnology may also choose
to purchase the facility at specific dates over the 10 year period. Using
current estimates, the purchase price would be approximately $52 million at the
end of the first year, decreasing on an amortizing basis to approximately $34.5
million at the end of the tenth year.

      Covance owns 76% of the voting capital stock of Covance Biotechnology in
the form of convertible preferred stock. The remaining 24% of Covance
Biotechnology's capital stock is owned by certain minority stockholders (the
"Minority Stockholders") in the form of common stock. Covance's ownership in
Covance Biotechnology may be reduced to 68% if certain options granted to key
Covance Biotechnology executives are exercised in full.

      The Company, Covance Biotechnology, and the Minority Stockholders are also
party to a capital contribution and stockholder agreement (the "Agreement"),
which, among other things, limits certain Minority Stockholders common stock
transfers, grants Covance a right of first refusal on shares of Minority
Stockholders common stock, and grants Covance the right to purchase up to
one-third of the common stock held by the Minority Stockholders on certain
dates. If Covance chooses not to exercise its purchase right, the Agreement
obligates Covance Biotechnology to use its best efforts to arrange for the sale
of such shares on certain specified terms, and certain other conditions. The
Company has no affirmative obligation to provide further funds or financial
assistance of any kind to Covance Biotechnology.

Clinical and Periapproval Services

      Covance offers a comprehensive range of clinical trial services, including
Phase I through III clinical studies and periapproval studies, including Phase
IIIb and Phase IV clinical studies, TINDs, post-marketing surveillance studies
and prescription to over-the-counter switch studies ("Rx to O-T-C Switch").
Covance also has extensive experience in a number of therapeutic areas,
including diseases of the cardiovascular and central nervous systems,
endocrinology and respiratory systems, infectious diseases (including AIDS), and
significant experience in other areas including oncology, bone metabolism
immunology, gastroenterology, urology, dermatology and hematology. Covance has
extensive experience in managing both small, medium and large trials in the
United States and in many parts of the world, including Australia, Canada,
Western, Central and Eastern Europe, Israel, Mexico and Russia. These trials may
be conducted separately or simultaneously as part of a multinational development
plan.


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      Covance can manage every aspect of clinical trials by providing its
clients the following services: clinical development plans and protocol design,
consulting services (clinical and data management, regulatory advice and
filings, information systems and drug development strategy), site, investigator
and patient enrollment, preparation and submission of TINDs, INDs, European
study permissions, NDAs, computer assisted NDAs ("CANDAs"), product license
applications ("PLAs"), computer assisted PLAs ("CAPLAs") and European submission
dossiers, computerized patient randomization and dose assignment and tracking,
Phase I - Phase IV study design and implementation, monitoring and safety
evaluation management and reporting, data processing and management, statistical
analyses and report writing, medical writing, good clinical practices ("GCP")
and GMP audits and, through its relationship with Bio-Imaging, medical image
digitization and processing. Clinical trials are managed by a dedicated project
team, which, in each case, is led by a project director who supervises all
aspects of the clinical trial.

      The following is a description of the core services Covance provides,
either on an individual or integrated basis depending on client needs, as part
of conducting clinical trials:

      Study Design. Covance serves its clients in the critical area of study
design by applying its experience in the preparation of study protocols and case
report forms ("CRFs"). The study protocol defines the medical issues to be
examined in evaluating the safety and efficacy of the drug under study, the
number of patients required to produce statistically valid results, the clinical
tests to be performed in the study, the time period over which the study will be
conducted, the frequency and dosage of drug administration and the exact
inclusion and exclusion criteria to be met for the patients enrolled in the
study. The success of the study depends not only on the ability of the protocol
to accurately reflect requirements of regulatory authorities, but also on the
ability of the protocol to fit coherently with the other aspects of the
development process and the ultimate marketing strategy for the drug. This
includes outcomes and pharmacoeconomic concerns and reimbursement planning. With
study protocol finalization, CRFs must be developed to record the desired
information to be obtained from the clinical studies. The various other
disciplines involved in the drug development process, including data management,
statistics and regulatory affairs, must work closely with the clinical trial
management project team to assure that the right data are acquired in a form
which is most efficient for subsequent data entry, management analyses and
reporting.

      Investigator Recruitment. During the clinical trials, administration of
the drug to patients is supervised by physicians, also referred to as
investigators, at hospitals, clinics or other locations, also referred to as
investigational sites. Covance solicits the participation in the study of
investigators who contract directly with either Covance or its client. Covance
maintains and continually expands and refines its computerized database of
approximately 30,000 investigators. Information regarding Covance's experience
with these investigators, including factors relevant to rapid study initiation,
are contained in 

                                                                              11

<PAGE>

the database. Covance has worked with approximately 25,000 general practitioners
in connection with the conduct of Phase III and IV studies.

      Study Monitoring. Covance provides study monitoring services which include
investigational site initiation, patient enrollment assistance and data
collection through subsequent site visits. These visits also serve to assure
that data are gathered according to GCP, the requirements of the client, as
specified in the study protocol or otherwise, and applicable regulations.
Covance focuses at an early stage on identifying and quickly completing the
critical rate-limiting steps of screening and selecting investigators,
processing pre-study regulatory paperwork, obtaining institutional review board
approvals and scheduling investigational site initiation visits.

      Clinical Data Management and Biostatistical Analysis. Covance's data
management and biostatistical analysis operations are managed by professionals
with extensive pharmaceutical and biotechnology industry experience in the
design and construction of local and multinational clinical trial databases.
Data management and biostatistical analysis services are offered as discrete
products and as part of an integrated drug development program. During the
design of development plans and protocols, Covance offers consulting services
relating to, and the determination of, sample size parameters for patient
enrollment, development of data analysis plans and randomization schemes. During
the conduct of clinical trials, Covance assists in the rapid acquisition of
clean and accurate data. Following completion of the clinical trials, Covance
assists in report preparation and regulatory submissions. Covance's
biostatisticians may participate with clients in meetings with the FDA to
present and discuss biostatistical analyses prepared by Covance. Covance has
expertise in electronically capturing and integrating geographically diverse
data. Covance employs a variety of software, which may be specified by clients
or combined with customized programs developed by Covance.

      Clinical Development Technologies. To expedite the drug development
process and to help reduce costs, Covance created a proprietary drug management
system based on an Interactive Voice Response System ("IVRS") and an Information
Access System ("IAS"), which are interactive information technologies. IVRS uses
touch-tone telephone technology to assist biopharmaceutical clients in managing
the "just-in-time" delivery of clinical drug supplies and patient randomization.
IVRS is available in multiple languages using toll free numbers and has, in some
cases, demonstrated up to 30% reduction in study drug waste. IAS, based on Lotus
Notes(R) software, provides clients with 24-hour access to study data, such as
study patient enrollment progress, patient visit information, CRF status and
serious adverse event experience.

      Medical Writing and Regulatory Services. Covance provides medical report
writing and regulatory services to its clients in a manner designed to
complement parallel development processes to reduce overall development time.
These services are fully integrated with Covance's other services to accelerate
development speed consistent with good service and regulatory compliance.
Services in this area include integrated 

                                                                              12

<PAGE>

clinical/statistical reports, manuscripts, risk/benefit assessment reports,
package inserts, quality assurance and environmental risk assessments. Covance
believes it was one of the first CROs to develop CANDAs and CAPLAs.

      Treatment Investigational New Drug Applications. The TIND is an
application by a pharmaceutical or biotechnology sponsor and the associated
procedure to allow broader populations of patients to receive treatment with an
investigational new drug for a serious or immediate life-threatening disease,
such as AIDS or cancer, for which no comparable or satisfactory therapy is
available. This treatment is provided during the clinical trial phase of
development but does not typically use controlled clinical trials. The Company
is experienced with TINDs and has developed specialized systems for prompt
initiation and effective operation of TIND programs, such as computerized
patient screening, optical scanning of CRFs and drug management systems. Other
special TIND programs or systems involve providing project specific information
to physicians, patients and patient advocacy groups, and data processing,
management, analyses and reporting systems. Covance's EAP, which is conducted
pursuant to a TIND, is a mechanism that allows innovative new therapies for
life-threatening diseases to be given to expanded populations prior to FDA
approval.

      Other Periapproval Studies. Besides TINDs, Phase IIIb studies (involving
studies conducted after NDA submission but before regulatory approval is issued)
and Phase IV studies, Covance performs other types of periapproval studies such
as post-marketing surveillance studies and Rx to O-T-C Switch studies.
Post-marketing surveillance studies are epidemiologically based evaluations of
the use of products in actual medical practice using a broad range of patients.
These studies use practicing physicians to evaluate primarily the safety profile
of the product under actual medical practice conditions. Post-marketing
surveillance studies are large, typically involving over 1,000 physicians and
thousands of patients, and usually focus on evaluating just a limited number of
key clinical outcomes, such as a particular side effect. In Rx to O-T-C Switch
studies, Covance gathers, on behalf of a sponsor, the necessary safety data to
obtain regulatory permission for the sale of its drug without the need of a
prescription. These studies are also large, well-controlled programs.

Health Economics

      Covance offers a wide range of health economic services for managed care
organizations, hospitals, health care provider networks and pharmaceutical and
device manufacturers. These services include outcomes and pharmacoeconomic
studies, reimbursement planning services and disease management services, as
discussed below.

      Outcomes and Pharmacoeconomic Studies. Covance offers its clients a full
range of strategic and analytic services, including strategic planning,
quality-of-life assessment, and economic studies (including feasibility studies,
protocol and instrument design and data analysis). Outcomes studies may be
prospective, often conducted in conjunction with clinical trials, or
retrospective. Many cost-effectiveness studies employ economic 

                                                                              13

<PAGE>

modeling techniques to evaluate the full financial impact of new medical
technologies. When planning studies, the Company examines the audience for the
study's findings to determine which of the client's concerns (such as regulatory
approval, clinical acceptance, insurer coverage or insurer payment) might be
more fully informed by the availability of outcomes data, and then determines
how such data can be efficiently collected and communicated. Covance typically
involves academic and clinical experts to ensure that appropriate techniques are
used and to enhance study credibility and acceptance. Covance also designs most
studies with a goal of publishing its findings in respected, peer-reviewed
journals.

      Covance believes that given the changing competitive pressures affecting
the pharmaceutical industry and the rising need to more rigorously demonstrate
the value of particular drugs, both in their own right and compared to other
drugs and treatment regimes, the ability to perform outcomes and
pharmacoeconomic studies will become increasingly important.

      Reimbursement Planning. Covance offers its customers strategic
reimbursement and market planning services. These services enable clients to
enhance the commercial success of their medical products. Covance analyzes, on
behalf of the customer, who will pay for a medical product (e.g., third-party
payors such as private insurance companies or federal programs like Medicare)
and what economic barriers or opportunities exist for the product (e.g., claims
coding, coverage policy, or payment amounts). In addition, Covance often offers
its reimbursement planning activities in conjunction with its other services
that evaluate existing and potential market size, pricing, distribution, and
economic impact.

      Through its Medical Technology Hotlines(R) division, Covance also provides
full service reimbursement case management, including: (1) contacting insurers
to investigate specific coverage and benefit matters, resolving denied claims
and educating insurers; (2) assisting manufacturers in designing and effectively
running their indigent patient programs, pursuant to which costly new products
are made available to patients who cannot afford them because of inadequate
insurance coverage or other cost reasons; (3) designing and administering
transition programs for manufacturers, which includes obtaining third-party
payment for a product for patients who had previously received it free as part
of a clinical trial; and (4) conducting reimbursement training seminars for
clients and their customers.

      All of these services are supported by a dedicated information services
group that provides a range of data products, services and information systems,
including customized hospital cost reports, patient average lengths of stay or
mortality rates at the federal, state, local or individual hospital level. The
extensive economic and epidemiologic databases Covance maintains are used to
perform market research, determine the economics of a disease or inform
government authorities about the need for potential policy changes.


                                                                              14

<PAGE>

      Disease Management Services. Working for a variety of customers, including
pharmaceutical and device manufacturers, managed care organizations, hospitals,
provider networks and computerized medical record companies, Covance designs and
implements systems that track patterns of care, patient outcomes, and costs, and
develops programs and tools designed to improve quality and decrease costs of
care. Such programs and tools include medical practice guidelines and
computerized decision support tools.

Central Laboratory Services

      Covance believes that the ability to conduct high quality and
sophisticated central laboratory services is an integral aspect of what
constitutes a full service CRO. Covance's two facilities (one located in the
United States and the other in Switzerland) provide central laboratory services
dedicated exclusively to biopharmaceutical studies. These facilities provide
clients with combinable data in studies that can be conducted separately, or
multinationally and simultaneously. Providing combinable data eliminates the
need for statistical correlation among different laboratories by using
consistent laboratory methods, the use of same reagent manufacturers, and the
use of identical clinical trial reference ranges and equipment calibration.
Covance also employs a proprietary clinical trials management system, which
Covance believes is unique, that enables it to enter a sponsor's protocol
requirements directly into its own database. This system, based on protocol
requirements, constructs the drug kits that will go to the investigational sites
and the requisition forms therefor, allows for proper laboratory specimen
collection from the investigational site, sequencing of study participants
visits and investigator test ordering of additional tests and ensures that all
demographic data is complete and accurate and will produce for the client
reports that are customized to their specifications. The laboratories provide a
comprehensive audit trail by ensuring that all laboratory data are traceable to
source documents, are capable of delivering customized data electronically
within 24 hours and provide safety test results within 48 hours from most
locations. As the need for central laboratory services expands geographically,
the Company has expanded the reach of its central laboratories business through
a contractual arrangement with a leading South African laboratory that allow
Covance to combine the testing capabilities of such laboratory with its own
proprietary systems.

Clinical Packaging

      Covance offers full service contract packaging for the pharmaceutical
industry in the United States and Europe including package development and
design, coldformed and thermoformed blister units, blister packaging, multi-dose
bottle filling, clinical labeling, storage and site distribution of clinical
supplies and return services for unused supplies. With the addition, in 1996, of
Covance Pharmaceutical Packaging Services AG, Covance packaging services and
products have been expanded to include software inventory and validation
controls and processes and the manufacturing of robotic packaging machines.
Covance believes that by integrating packaging services with its other clinical
and periapproval services it can accelerate the drug development process through
operational 


                                                                              15

<PAGE>

efficiencies that arise from coordinating at the outset the design of a clinical
trial. Also in 1996, Covance purchased a 91,000 square foot packaging facility
in Horsham, United Kingdom. This facility will provide a modern pharmaceutical
packaging operation at one of the largest packaging facilities in Europe.
Management expects commercial operations to commence early in the second quarter
1997, with the facility to be fully operational in mid 1997.

Clients and Marketing

      Covance provides its product development services on a global basis to,
among others, the pharmaceutical and biotechnology industries. In 1996, Covance
served over 270 biopharmaceutical companies, including all 50 of the world's
largest pharmaceutical companies and 17 of the world's 25 largest biotechnology
companies. Of the 270 biopharmaceutical companies Covance serves, 45 are
Japanese. The Japanese biopharmaceutical companies are served by Covance's
United States and European operations.

      For the year ended December 31, 1996, approximately 71% of Covance's net
revenues, 77% of Covance's operating income and 77% of Covance's identifiable
assets were attributed principally to United States operations, while
approximately 29% of Covance's net revenues, 23% of Covance's operating income
and 23% of Covance's identifiable assets were attributed to European (including
Asian) operations. Approximately 62% of Covance's net revenues during 1996 were
attributed to the Company's clinical lines of business. Approximately 38% of
Covance's net revenues during 1996 were attributed to the Company's nonclinical
lines of business. In 1996, no client accounted for more than 10% of the
Company's net revenue, and only one client accounted for more than 5% of the
Company's net revenue. In 1996, Covance's top five clients accounted for
approximately 20% of Covance's net revenues.

      Covance's sales activities are conducted by more than 120 business
development people based in Covance's operations in the United States, Europe,
Australia, Japan and Singapore. Most of Covance business development personnel
have technical or scientific backgrounds.

      To strengthen its sales and marketing activities, Covance introduced in
1995 a Lotus Notes(R) based large account management process ("LAMP") that
allows Covance business development personnel in all locations to promptly
ascertain the status of any new client activity with any Covance operation. LAMP
is an important tool in managing Covance's key account program. Through LAMP,
the key account program and dedicated resources, Covance believes it can better
coordinate and unite the efforts of its sales and marketing personnel and
strengthen relationships with pivotal biopharmaceutical clients. Covance
believes that this will allow it to improve its understanding of its clients'
organizational structure, management practices and product pipeline, and, thus,
better serve its clients' needs. Conversely, LAMP also enables 


                                                                              16

<PAGE>

clients, across different business functions, to better understand the full
range of Covance's services.

Contractual Arrangements

      Most of Covance's contracts in the preclinical, central laboratory,
clinical packaging and health economics areas are fixed price or
fee-for-service, and in the clinical and periapproval areas are fee-for-service
with a cap. To a lesser extent, some of the contracts in the clinical and
periapproval areas are fixed price or fee-for-service without a cap. In cases
where the contracts are fixed price, Covance bears the cost of overruns, with
certain exceptions, but benefits if the costs are lower than anticipated. In
cases where the contracts are fee-for-service with a cap, the contracts contain
an overall budget for the trial based on time and cost estimates. If costs are
lower than anticipated, the client keeps the savings, but if costs are higher
than estimated, then Covance is responsible for the overrun unless the increased
cost is a result of a change requested by the client, such as an increase in the
number of patients to be enrolled or the type or amount of data to be collected.
Contracts may range from a few months to several years depending on the nature
of the work performed. In some cases, for multiyear contracts involving either
preclinical or clinical and periapproval trials, a portion of the contract fee
is paid at the time the study or trial is started with the balance of the
contract fee payable in installments over the study or trial duration and may be
performance based. For instance, in clinical and periapproval trials,
installment payments may be related to investigator recruitment, patient
enrollment or delivery of the database.

      Most of Covance's contracts for the provision of its services are
terminable by the client either immediately or upon notice. Contracts may be
terminated for a variety of reasons, including the failure of a product to
satisfy safety requirements, unexpected or undesired results of the product, the
client's decision to forego or terminate a particular study, insufficient
enrollment or investigator recruitment, or the Company's failure to properly
discharge its obligations thereunder.

Backlog

      Certain of Covance's studies and projects are performed over an extended
period of time which may be as long as several years. With respect to such
studies or projects, Covance maintains an order backlog to track anticipated net
revenues for such work that has yet to be earned. However, Covance does not
maintain an order backlog for all the services it provides because such services
are performed within a short period of time or for other reasons where it is not
practical or feasible to maintain an order backlog. Additionally, services
appropriate for backlog measurement do not correspond exactly with any
particular line of business.

      Backlog is principally calculated with respect to work to be performed
pursuant to letters of intent and contracts. Once work under a letter of intent
or contract commences, net revenue is recognized over the life of the contract.
In certain cases, however, 


                                                                              17

<PAGE>

Covance will work on a project prior to executing a letter of intent and the
backlog may include the net revenue expected from such project.

      No assurance can be given that the Company will be able to realize all or
any net revenue included in backlog. Although backlog can be meaningful to
management with respect to a particular study where study-specific information
is known (for example, study duration, performance clauses and other
study-specific contract terms), Covance believes that its aggregate backlog as
of any date is not necessarily a meaningful indicator of future results for a
variety of reasons, including the following: First, studies vary in duration.
For instance, some studies that are included in 1995 backlog may be completed in
1996, while others may be completed in later years. Second, the scope of studies
may change, which may either increase or decrease their value. Third, studies
included in backlog may be subject to bonus or penalty payments. Fourth, trials
under letters of intent or contracts included in backlog are subject to
termination or delay at any time by the client or regulatory authorities.
Termination or delays can result from a number of reasons. Delayed contracts
remain in Covance's backlog pending determination of whether to continue, modify
or cancel the study.

      Based upon the above discussion, Covance's aggregate backlog was
approximately $503 million, compared to approximately $392 million at December
31, 1995.

Competition

      The CRO industry is highly fragmented, with participants ranging from
hundreds of small, limited-service providers to a few full service CROs with
global capabilities. Covance primarily competes against in-house departments of
pharmaceutical companies, full-service CROs and, to a lesser extent,
universities and teaching hospitals. Covance believes, based on 1996 revenues,
that the five largest CROs besides itself include Pharmaceutical Product
Development Inc. (after its merger with Applied Bioscience International Inc.),
Quintiles Transnational Corporation, Huntington International Holdings PLC,
Parexel International Corporation and ClinTrials Inc.

      As a result of competitive pressures, the CRO industry is consolidating.
This trend is likely to produce competition among the larger CROs for both
clients and acquisition candidates and companies may choose to limit the CROs
with whom they are willing to work. In addition, there are few barriers to entry
for small, limited-service entities considering entering the CRO industry. CROs
compete on the basis of several factors, including reputation for on-time
quality performance, expertise and experience in specific therapeutic areas,
scope of service offerings, how well such services are integrated, strengths in
various geographic markets, price, technological expertise and efficient drug
development processes, the ability to acquire, process, analyze and report data
in a time-saving and accurate manner, the ability to manage large-scale clinical
trials both domestically and internationally, expertise and experience in health
economics and size. The Company believes that it competes favorably in all of
these areas.


                                                                              18

<PAGE>

Relationship With Corning and Quest

      Effective as of the Distribution Date, Corning, Quest and Covance entered
into certain agreements to provide for an orderly transition to the status of
three separate independent companies, to govern their relationship subsequent to
the Distributions and to provide for the allocation of tax and certain other
liabilities and obligations arising from periods prior to the Distributions.

      Transaction Agreement. The Transaction Agreement between Corning, Quest
and the Company provided for, among other things, certain conditions precedent
to the Distributions, certain corporate transactions required to effect the
Distributions and other arrangements between Corning, Quest and Covance
subsequent to the Distributions. The Transaction Agreement provided for, among
other things, assumptions of liabilities and cross-indemnities designed to
allocate generally, effective as of the Distribution Date, financial
responsibility for the liabilities arising out of or in connection with the
business of the Company, Quest and Corning.

      In addition to the specific indemnity described below, Corning, Quest and
Covance are obligated under the Transaction Agreement to indemnify and hold
harmless each other in respect of Indemnifiable Losses (as defined therein)
arising out of or otherwise relating to the management or conduct of their
respective businesses or the breach of any provision of the Transaction
Agreement. The Transaction Agreement also provided that, except as otherwise set
forth therein or in any other agreement, all costs or expenses incurred on or
prior to the Distribution Date in connection with the Distributions are to be
allocated among the parties. Except as set forth in the Transaction Agreement or
any related agreement, each party shall bear its own costs and expenses incurred
after the Distribution Date.

      Spin-Off Tax Indemnification Agreements. Corning and Covance entered into
a tax indemnification agreement (the "Corning/Covance Spin-Off Tax
Indemnification Agreement") pursuant to which, among other things, Covance
agreed with Corning that during the period from December 31, 1996 to December
31, 1998 (the "Restricted Period") (i) it would continue active conduct in its
CRO business, (ii) it would continue to own and manage at least 50% of the
assets which it owned immediately after the Distribution Date, and (iii) it
would refrain from certain stock issuances, mergers or liquidations, or any
revisions to its Rights Plan (as defined therein). Covance also agreed to
indemnify Corning for Taxes (as defined therein) arising from certain violations
of the Corning/Covance Spin-Off Tax Indemnification Agreement and for Taxes
arising as a result of the purchase of 20% or more of Covance Stock during the
Restricted Period or the commencement of a tender or purchase offer by a third
party for 20% or more of Covance stock. If the Company's obligations under the
Corning/Covance Spin-Off Tax Indemnification Agreement were breached and, as a
result thereof, one or both of the Distributions do not qualify for the
treatment stated in the Private Letter Ruling issued by the Internal Revenue
Service (the "IRS Ruling"), the Company would be required to 


                                                                              19

<PAGE>

indemnify Corning for Taxes imposed, and such indemnification obligations could
exceed the Company's net asset value at such time.

      Quest and Covance also entered into a tax indemnification agreement (the
"Quest Diagnostics/Covance Spin-Off Tax Indemnification Agreement") which was
essentially the same as the Corning/Covance Spin-Off Tax Indemnification
Agreement, except that Covance made representations and covenants to and
indemnified Quest, as opposed to Corning. Quest and Covance also entered into a
second tax indemnification agreement (the "Covance/Quest Diagnostics Spin-Off
Tax Indemnification Agreement") which is essentially the same as the spin-off
tax indemnification agreement between Corning and Quest, except that Quest made
representations and covenants to and indemnified Covance as opposed to Corning.

      The various Spin-Off Tax Indemnification Agreements also require Covance
to take such actions as Corning and Quest may reasonably request to preserve the
favorable tax treatment provided for in the rulings obtained from the IRS in
respect of the Distributions.

      Tax Sharing Agreement. Corning, Quest and Covance entered into a tax
sharing agreement (the "Tax Sharing Agreement") which allocated responsibility
for federal income and various other taxes ("Taxes") among the three companies.
The Tax Sharing Agreement provides that, except for Taxes arising as a result of
the failure of either or both of the Distributions to qualify for the treatment
stated in the IRS Ruling (which Taxes are allocated either pursuant to the
Spin-Off Tax Indemnification Agreements or as described below), Corning is
liable for and will pay the federal income taxes of the consolidated group that
includes Quest and Covance and their subsidiaries, provided, however, that Quest
and Covance were required to reimburse Corning for taxes for periods beginning
after December 31, 1995 in which they were members of the Corning consolidated
group and for which tax returns have not been filed as of the Distribution Date.
This reimbursement obligation is based on the hypothetical separate federal tax
liability of Quest and Covance, calculated on a separate consolidated basis,
subject to certain adjustments. Under the Tax Sharing Agreement, in the case of
adjustments by a taxing authority of a consolidated federal income tax or
certain other tax returns prepared by Corning which includes Quest or Covance,
then, subject to certain exceptions, Corning is liable for and will pay any tax
assessments, and is entitled to any tax refunds, resulting from such audit.

      The Tax Sharing Agreement further provided that, if either of the
Distributions fails to qualify for the tax treatment stated in the IRS Ruling
(for reasons other than those indemnified against under one or more of the
Spin-Off Tax Indemnification Agreements), Taxes imposed upon or incurred by
Corning, Quest or Covance as a result of such failure are to be allocated among
Corning, Quest and Covance in such a manner as will take into account the extent
to which the actions or inactions of each may have contributed to such failure,
and Corning, Quest and Covance each will indemnify and hold harmless the other
from and against the taxes so allocated. If it is determined that none of the
companies 


                                                                              20

<PAGE>

contributed to the failure of such Distribution to qualify for the tax treatment
stated in the IRS Ruling, the liability for taxes will be borne by each company
in proportion to its relative average market capitalization as determined by the
average closing price for the common stock of each company during the 20
trading-day period immediately following the Distribution Date. In the event
that either of the Distributions fails to qualify for the tax treatment stated
in the IRS Ruling and the liability for taxes as a result of such failure is
allocated among Corning, Quest and the Company, the liability so allocated to
the Company could exceed the net asset value of Covance.

Banking Facilities

      In November 1996, Covance obtained from a syndicate of banks (the "Banks")
a five-year $250,000,000 Senior Revolving Credit Facility (the "Credit
Facility"). The Credit Facility is guaranteed by certain material United States
subsidiaries of Covance and, in certain circumstances, by the pledges of stock
of certain foreign subsidiaries of Covance. The proceeds of the Credit Facility
were used to effect certain repayments required by the Distributions. The Credit
Facility will also be used to provide financing for the Company's and its
subsidiaries' working capital needs, capital expenditures, acquisitions and
other corporate purposes. Covance may prepay the loans under the Credit Facility
in whole or in part (subject to certain reimbursements to the Banks) and may
permanently reduce or terminate the Banks commitments. Under the Credit
Facility, Covance may choose to obtain different forms of loans, at varying
interest rates. The Company is also obligated to pay certain fees in connection
with the Credit Facility, including a facility fee. Covance will be required to
comply with certain affirmative and negative covenants, including financial
covenants which require the Company to meet minimum interest coverage targets
and maximum leverage ratios.

Government Regulation

      The laboratory, manufacturing and packaging services performed by Covance
are subject to various regulatory requirements designed to ensure the quality
and integrity of the testing, manufacturing and packaging processes. The
industry standards for conducting preclinical laboratory testing are embodied in
the GLP and GMP regulations and for central laboratory operations in the
Clinical Laboratory Improvement Amendments of 1988 ("CLIA"). Covance's central
laboratories also, in limited circumstances and when required by a client,
follow GLP. Covance's central laboratory in Geneva has also been certified by
the College of American Pathologists ("CAP"). GMP sets forth the requirements
for manufacturing facilities. GLP and GMP have been adopted by the FDA, by the
Department of Health in the United Kingdom and by similar regulatory authorities
in other parts of the world. GLP and GMP stipulate requirements for facilities,
equipment and professional staff. The regulations require standardized
procedures for studies, for recording and reporting data and for retaining
appropriate records. To help satisfy its compliance obligations, Covance has
established quality assurance controls at its laboratory and manufacturing
facilities which monitor ongoing 


                                                                              21

<PAGE>

compliance with GLP, GMP and CLIA regulations, as applicable, by auditing test
data and conducting regular inspections of testing and manufacturing procedures.

      The industry standard for the conduct of clinical research and development
studies is embodied in the regulations for GCP. Although GCP has not been
formally adopted by the FDA nor, with certain exceptions, by similar regulatory
authorities in other countries, certain provisions of GCP have been included in
FDA regulations. As a matter of practice, the FDA and many other regulatory
authorities require that test results submitted to such authorities be based on
studies conducted in accordance with GCP. These regulations require (1)
complying with specific requirements governing the selection of qualified
investigators; (2) obtaining specific written commitments from the
investigators; (3) verifying that patient informed consent is obtained; (4)
monitoring the validity and accuracy of data; (5) verifying drug or device
accountability; (6) instructing investigators to maintain records and reports;
and (7) permitting appropriate governmental authorities access to data for their
review. Covance must also maintain reports for each study for specified periods
for inspection by the study sponsor and the FDA during audits. As with GLP and
GMP, noncompliance with GCP can result in the disqualification of data
collection during the clinical trial.

      Covance's standard operating procedures are written in accordance with
regulations and guidelines appropriate to the region and the nation where they
will be used. Within Europe, all work is carried out in accordance with the
European Community Note for Guidance "Good Clinical Practice for Trials on
Medicinal Products in the European Community" and the requirements of the
applicable country. In addition, FDA regulations and guidelines serve as a basis
for Covance's North American and Asian/Pacific standard operating procedures.
From an international perspective, when applicable, Covance has implemented
common standard operating procedures across regions to assure consistency
whenever it is feasible and appropriate to do so.

      Covance's animal import and breeding facilities are also subject to a
variety of federal and state laws and regulations, including The Animal Welfare
Act and the rules and regulations promulgated thereunder by the United States
Department of Agriculture ("USDA"). These regulations establish the standards
for the humane treatment, care and handling of animals by dealers and research
facilities. Covance's breeding and import animal facilities maintain detailed
standard operating procedures and the documentation necessary to comply with
applicable regulations for the humane treatment of the animals in its custody.
Besides being licensed by the USDA as both a dealer and research facility, this
business is also accredited by the American Association for the Accreditation of
Laboratory Animal Care and has registered assurance with the United States
National Institutes of Health Office of Protection for Research Risks.

      The use of controlled substances in testing for drugs of abuse is
regulated by the Drug Enforcement Administration (the "DEA"). All Covance
laboratories and packaging sites using controlled substances for testing or
packaging purposes are licensed by the DEA.


                                                                              22

<PAGE>

      Covance's United States laboratories are subject to licensing and
regulation under federal, state and local laws relating to hazard communication
and employee right-to-know regulations, the handling and disposal of medical
specimens and hazardous waste and radioactive materials, as well as to the
safety and health of laboratory employees. All Covance laboratories are operated
in material compliance with applicable federal and state laws and regulations
relating to the storage and disposal of all laboratory specimens including the
regulations of the Environmental Protection Agency, the Nuclear Regulatory
Commission, the Department of Transportation, the National Fire Protection
Agency and the Resource Conservation and Recovery Act. Although Covance believes
that it is currently in compliance in all material respects with such federal,
state and local laws, failure to comply could subject Covance to denial of the
right to conduct business, fines, criminal penalties and other enforcement
actions.

      In addition to its comprehensive regulation of safety in the workplace,
the Occupational Safety and Health Administration has established extensive
requirements relating to workplace safety for health care employers, whose
workers may be exposed to blood-borne pathogens such as HIV and the hepatitis B
virus. These regulations, among other things, require work practice controls,
protective clothing and equipment, training, medical follow-up, vaccinations and
other measures designed to minimize exposure to chemicals, and transmission of
blood-borne and airborne pathogens. Furthermore, relevant Covance employees
receive initial and periodic training to ensure compliance with applicable
hazardous materials regulations and health and safety guidelines.

      The regulations of the Department of Transportation, the Public Heath
Service and the Postal Service apply to the surface and air transportation of
laboratory specimens. Covance's laboratories also comply with the International
Air Transport Association regulations, which govern international shipments of
laboratory specimens. Furthermore, when the materials are sent to a foreign
country, the transportation of such materials becomes subject to the laws, rules
and regulations of such foreign country.

Intellectual Property

      Covance has developed certain computer software and technically derived
procedures that provide separate services and are intended to maximize the
quality and effectiveness of its services. Although Covance's intellectual
property rights are important to its results of operations, Covance believes
that such factors as the technical expertise, knowledge, ability and experience
of Covance's professionals are more important, and that, overall, these
technological capabilities provide significant benefits to its clients.

Employees

      At January 15, 1997, Covance had approximately 5,400 employees,
approximately 30% of whom are employed outside of the United States.
Approximately 25 of Covance's employees hold M.D. degrees, 169 hold Ph.D.
degrees, 11 hold Pharm.D. 


                                                                              23

<PAGE>

degrees, 25 hold D.V.M. degrees and 434 hold masters or other postgraduate
degrees. Covance believes that its relations with its employees are good.


Item 2.  Properties

      Covance both owns and leases its facilities. Covance's principal executive
offices are located in Princeton, New Jersey where it leases approximately
157,000 square feet of space. The lease expires in 2004. Covance owns its
397,000 square-foot preclinical laboratory located in Madison, Wisconsin and its
205,000 square-foot preclinical laboratory in Harrogate, United Kingdom. Covance
leases most of its 201,000 square-foot preclinical laboratory in Vienna,
Virginia. It also owns several of the buildings. The leases expire in 1999 and
have a 10-year renewal option. Covance also leases its 152,000 square-foot
pharmaceutical laboratory in Indianapolis, Indiana, which expires in 2000.
Covance leases its 51,000 square-foot pharmaceutical laboratory in Geneva,
Switzerland, which lease expires in 2000. Covance's domestic packaging
operations are conducted from several leased facilities. The principal packaging
facility is in Allentown, Pennsylvania. The leases are for approximately 100,000
square feet of space and they all expire in 1999. Covance's Swiss-based
packaging operation currently conducts business in a 20,000 square-foot leased
facility, but has plans to construct a new, purpose-designed 37,000 square-foot
facility. The new facility is expected to be completed in early 1998. In
addition, in October 1996, Covance purchased a 91,000 square-foot former
pharmaceutical manufacturing facility in Horsham, United Kingdom. After its
renovation is completed by mid-1997, this facility will be used to provide
clinical packaging, clinical and periapproval services and health economics
services and also serve as Covance's European headquarters. Covance
Biotechnology's facility in North Carolina is leased. Covance also owns or
leases other facilities in the United States, United Kingdom, Ireland, Belgium,
France, Germany, Switzerland, Sweden, Australia, Singapore and Japan.


Item 3.  Legal Proceedings

      Covance is party to lawsuits and administrative proceedings incidental to
the normal course of its business. Covance does not believe that any liabilities
related to such lawsuits or proceedings will have a material effect on its
financial condition or results of operations.


                                                                              24
<PAGE>


Item 4.  Submission of Matters to a Vote of Security Holders

      In October 1996, the Company's sole stockholder, Quest Diagnostics, Inc.
("Quest"), by unanimous written consent, approved the change of the Company's
name from Corning Pharmaceutical Services Inc. to Covance Inc.

      In October 1996, Quest, by unanimous written consent, approved the merger
of the Company's subsidiary, Covance Clinical and Periapproval Services Inc.
with and into the Company.

      On December 31, 1996, the Company held a Special Meeting, in lieu of an
Annual Meeting of Stockholders, to elect Class I, II and III Directors. All
shares were voted in favor of the election of the following Directors to their
respective Class, with each term expiring at the Annual Meeting of Stockholders
as noted, or until their successors have been elected and qualified:


              Name                      Class             Term Expiring
              ----                      -----             -------------

       Robert M. Baylis                   I                    1998
       Irwin Lerner                       I                    1998

       J. Randall MacDonald               II                   1999
       William C. Ughetta                 II                   1999

       Van C. Campbell                   III                   2000
       Christopher A. Kuebler            III                   2000
       Nigel W. Morris                   III                   2000





                                                                              25
<PAGE>


                                     PART II


Item 5.  Market for Registrant's Common Equity and Related Stockholder Matters

      The Company's Common Stock is traded on the New York Stock Exchange
(symbol: CVD). The following table sets forth the high and low sales prices on
the New York Stock Exchange since the Company's Common Stock began trading on a
"when issued" basis on December 17, 1996. The Company's Common Stock began
trading "regular way" on January 14, 1997.

           Quarter Ended                   High                Low
           -------------                   ----                ---

           Fourth Quarter 1996            $25.00             $20.875
           (December 17th
             through December 31st)


      As of March 3, 1997, there were 15,448 holders of record of the Company's
Common Stock.

      The Company does not currently intend to pay dividends in the foreseeable
future, but to reinvest earnings in the Company's business. The Company is also
restricted (subject to certain exceptions) from paying dividends on its Common
Stock by certain covenants contained in a credit agreement to which the Company
is a party.


                                                                              26
<PAGE>


Item 6.  Selected Financial Data

      The following table presents selected historical financial data of Covance
at the dates and for each of the periods indicated. The selected financial data
as of and for each of the years ended December 31, 1996, 1995, 1994 and 1993 has
been derived from the audited consolidated financial statements of Covance. The
selected financial data as of and for the year ended December 31, 1992 has been
derived from Covance's unaudited consolidated financial statements. In the
opinion of management, the unaudited financial statements include all
adjustments, consisting of normal recurring accruals, that are necessary for a
fair presentation of the financial position and results of operation for 1992.

      The selected financial data should be read in conjunction with the audited
Covance financial statements and notes thereto ("Audited Covance Financial
Statements") filed elsewhere herein. Historical consolidated financial data may
not be indicative of Covance's future performance. See the Audited Covance
Financial Statements. See also "Management's Discussion and Analysis of
Financial Condition and Results of Operations of Covance."









                                                                              27
<PAGE>


<TABLE>
<CAPTION>
                                                                   Year Ended December 31,
                                       ------------------------------------------------------------------------------------
                                           1996             1995           1994          1993      1992
                                          -------          -------        -------      -------   -------
                                                                         (in thousands)
<S>                                      <C>             <C>             <C>          <C>        <C>
Income Statement Data:
Net revenues .........................   $ 494,828       $ 409,174       $ 319,501    $289,697   $270,871
Costs and expenses:
  Cost of revenue ....................     324,345         270,726         213,490     192,783    192,375
  Selling, general and
      administrative .................      80,014          64,201          48,892      42,949     41,230
Spin-off related charge ..............      27,404
Restructuring charge .................                       4,616                                  3,373
  Depreciation and
      amortization ...................      25,204          22,070          18,520      16,984     15,212
                                         ---------       ---------       ---------    --------   --------
      Total ..........................     456,967         361,613         280,902     252,716    252,190
                                         ---------       ---------       ---------    --------   --------
Income from operations ...............      37,861(a)       47,561(b)       38,599      36,981     18,681
                                         ---------       ---------       ---------    --------   --------
Other expense (income)
  Interest expense, net ..............       6,791           5,269           4,307       4,421      5,686
  Foreign exchange (gain)
      loss ...........................       1,116            (784)           (712)        852      1,258
                                         ---------       ---------       ---------    --------   --------
                                             7,907           4,485           3,595       5,273      6,944
                                         ---------       ---------       ---------    --------   --------
Income before taxes and
    equity investee loss
    (gain) ...........................      29,954(a)       43,076(b)       35,004      31,708     11,737
Taxes on income ......................      17,377          18,445          14,924      13,506      6,834
Equity investee (gain) loss ..........        (139)            405             435       1,391        303
                                         ---------       ---------       ---------    --------   --------
Net income before cumulative
    effect of change in
    accounting method ................      12,716          24,226          19,645      16,811      4,600
Cumulative effect of change
    in method of accounting
    for postretirement
    benefits other than
    pensions .........................                                                              4,334
                                         ---------       ---------       ---------    --------   --------
Net income ...........................   $  12,716(a)    $  24,226(b)    $  19,645    $ 16,811   $    266
                                         =========       =========       =========    ========   ========
Balance Sheet Data (at end of period):
  Working capital ....................   $  65,946       $  18,472       $  12,961    $ 12,076   $ 15,451
  Total assets .......................     451,047         322,510         271,992     229,693    225,337
  Long-term debt .....................     163,000          89,836          75,178      69,239     77,916
  Stockholder's equity ...............     110,704          82,517          63,908      49,388     37,197
</TABLE>

- ------------
      (a)Excluding the impact of the fourth quarter 1996 one-time spin-off
         related charge totaling $27,404 ($19,725 net of tax), income from
         operations, income before taxes and equity investee gain and net income
         for the year ended December 31, 1996 was $65,265, $57,358 and $32,441,
         respectively.

      (b)Excluding the impact of the second quarter 1995 restructuring charge
         totaling $4,616 ($2,770 net of tax), income from operations, income
         before taxes and equity investee loss and net income for the year ended
         December 31, 1995 was $52,177, $47,692 and $26,996, respectively.


                                                                              28

<PAGE>

Item 7.  Management's Discussion and Analysis of Financial Condition and Results
              of Operations

Overview

      Covance is a leading CRO providing a wide range of integrated product
development services on a worldwide basis to the biotechnology, pharmaceutical
and medical device industries. In addition, and to a lesser extent, Covance
provides services such as health economics for managed care organizations,
hospitals and health care provider networks, and early development and
laboratory testing services to the chemical, agrochemical and food industries.
The foregoing services can be broadly classified into six lines of business:
preclinical, biomanufacturing, clinical and periapproval, central laboratory,
clinical packaging, and health economics. These six lines of business can be
further categorized as non-clinical (preclinical and biomanufacturing) and
clinical (clinical and periapproval, central laboratory, clinical packaging and
health economics). Covance believes it is one of the largest biopharmaceutical
CROs, based on estimated 1996 annual net revenue, and one of only a few that are
capable of providing comprehensive global product development services. Covance
offers its clients high quality services designed to reduce product development
time, allowing them to introduce their products into the marketplace faster and,
thus, maximize the period of marketing exclusivity and monetary return on their
investments. Additionally, Covance's comprehensive services and broad experience
provide clients with a variable cost alternative to fixed cost internal
development capabilities.

      The businesses that today constitute Covance were acquired by Corning,
starting in 1987, as part of a strategy to create a global, integrated and full
service product development company. In keeping with this strategy, during the
period 1994 through the present, Covance has purchased the remaining interest in
a jointly owned company, acquired a significant minority interest in a
complementary service business, acquired three new businesses and formed a major
new business venture. Specifically, in April 1994, Covance acquired the
remaining interest in SciCor S.A., a provider of central laboratory testing
services based in Switzerland. The transaction was accounted for as a purchase
business combination. In October 1994, Covance acquired a significant minority
equity position in Bio-Imaging Technologies, Inc. ("Bio-Imaging"), which uses
proprietary imaging technology to quantify the diagnostic and therapeutic
effectiveness of experimental drugs and devices. Covance expanded its offering
of value added product development services in January 1995 with the acquisition
of National Packaging Systems, Inc., a leading clinical packaging company. The
transaction was accounted for as a purchase business combination. In February
1995, Covance formed Covance Biotechnology, a majority-owned company which will
enable Covance to engage in biomanufacturing. In recognition of the rapid
changes in the biopharmaceutical industry's marketplace, particularly the need
for the industry to further demonstrate the benefits and cost effectiveness of
their products to payors, Covance purchased in March 1996 all the assets and
substantially all of the liabilities of Health Technology Associates, 


                                                                              29

<PAGE>

Inc. ("HTA"), a leading health economics company, in a transaction accounted for
as a purchase business combination. In October 1996, Covance expanded its
clinical packaging capabilities to Europe with the purchase of Swiss based CRS
Pacamed AG (now known as Covance Pharmaceutical Packaging Services AG). In
addition, Covance acquired an 81,000 square foot facility in Horsham, England,
which will be used, among other things, to provide clinical packaging services
in Europe.

      During the year ended December 31, 1996, approximately three-quarters of
Covance's net revenues were earned under contracts, which generally range in
duration from a few months to two years. Revenue from these contracts is
recognized as costs are incurred on the basis of the relationship between costs
incurred and estimated total costs. Typically, Covance's contracts in the
preclinical, central laboratory, clinical packaging and health economics areas
are fixed price or fee-for-service and in the clinical and periapproval areas
are fee-for-service with a cap. To a lesser extent, some of the contracts in the
clinical and periapproval areas are fixed price or fee-for-service without a
cap. The contracts may contain provisions for renegotiation for cost overruns
arising from changes in the level of work scope. Renegotiated amounts are
included in net revenues when earned and realization is assured. In some cases,
for multi-year contracts involving preclinical and clinical and periapproval
trials, a portion of the contract fee is paid at the time the trial is
initiated, with performance-based installments payable over the contract
duration, in some cases on a milestone achievement basis. Covance routinely
subcontracts with independent physician investigators in connection with
multi-site clinical trials. Investigator fees are not reflected in net revenues
or expenses since such fees are granted by customers on a "pass-thru basis"
without risk or reward to Covance. While most contracts are terminable either
immediately or upon notice by the client, they typically require payment of
expenses to wind down a study and fees earned to date, and, in some cases, a
termination fee or a payment of some portion of the fees or profit that could
have been earned under the contract if it had not been terminated early.

      Covance's cost of revenue includes appropriate amounts necessary to
complete the net revenues and earnings process and includes direct labor and
related benefit charges, other direct costs and allocable expenses (including
indirect labor, facility charges and information technology costs). These costs,
as a percentage of net revenues, tend to fluctuate from one period to another
(generally within a range of up to 2% in either direction) principally as a
result of changes in labor utilization and the mix of service offerings
involving hundreds of studies conducted during any period of time. Accordingly,
changes in cost of revenue as a percentage of net revenues plus or minus 2% are
expected from one period to another.


                                                                              30
<PAGE>


Results of Operations

      Year ended December 31, 1996 Compared with Year Ended December 31, 1995.
Net revenues increased 20.9% to $494.8 million for 1996 from $409.2 million for
1995. Excluding the impact of 1996 acquisitions, growth in net revenues was
16.4%. Net revenues from Covance's combined clinical lines of business,
excluding the recently acquired health economics and Swiss packaging businesses,
grew approximately 20%, benefiting from the continuing trend in outsourcing of
clinical development activities, while net revenues from Covance's more mature
preclinical business grew approximately 10%.

      Cost of revenue increased 19.8% to $324.3 million for 1996 from $270.7
million for 1995 as a result of the increase in net revenues. Cost of revenue,
as a percentage of net revenues, decreased to 65.5% for 1996 from 66.2% for
1995.

      Overall, selling, general and administrative expense, which consists
primarily of administrative payroll and related benefit charges, advertising and
promotional expenses, administrative travel and allocable expenses (facility
charges and information technology costs), increased 24.6% to $80.0 million for
1996 from $64.2 million for 1995. As a percentage of net revenues, selling,
general and administrative expense increased to 16.2% for 1996 from 15.7% for
1995. Contributing to the increase in selling, general and administrative
expense were a continuing increase in Covance's corporate center function,
increasing pre-operating costs relative to Covance's biomanufacturing business,
investment in a Covance-wide global sales force initiative, administrative costs
associated with the establishment of Covance's new Singapore operation and the
evaluation of further geographic expansion opportunities, partially offset by a
reduction in certain administrative costs allocated by Corning and affiliates.

      Depreciation and amortization increased 14.2% to $25.2 million or 5.1% of
net revenues for 1996 from $22.1 million or 5.4% of net revenues for 1995 as the
growth in net revenues outpaced the increase in these non-cash charges.

      Inclusive of special non-recurring charges in both years, income from
operations decreased by $9.7 million to $37.9 million for 1996 from $47.6
million for 1995. During the fourth quarter of 1996, Covance recorded a large
one-time charge totaling $27.4 million ($19.7 million after tax) associated with
its spin-off from Corning. This charge consisted of the cost to establish and
fund two employee stock ownership plans ($16.7 million) and the direct expenses
incurred to establish Covance as a separate publicly traded company ($10.7
million). During the second quarter of 1995, Covance recorded a restructuring
provision totaling $4.6 million ($2.8 million after tax) as a result of
management's decision to discontinue certain nonstrategic operations. Excluding
the impact of the 1996 spin-off related charge and the 1995 restructuring
provision, income from operations increased 25.1% to $65.3 million or 13.2% of
net revenues for 1996 from $52.2 million or 12.8% of net revenues for 1995.


                                                                              31

<PAGE>

      Other expense increased $3.4 million to $7.9 million for 1996 from $4.5
million for 1995, due to a net foreign exchange transaction loss of $1.1 million
incurred in 1996 as compared to a net gain of $0.8 million recorded in 1995 and
to an increase in net interest expense of $1.5 million.

      Covance's effective tax rate, excluding the special non-recurring charges
in both years, increased to 43.7% for 1996 from 42.5% for 1995. Since Covance
operates on a global basis, its effective tax rate is subject to variation from
year to year as the geographic dispersion of its pre-tax earnings changes.

      Net income decreased to $12.7 million for 1996 from $24.2 million for
1995. Excluding the after tax impact of the 1996 spin-off related charge and
1995 restructuring provision, net income increased $5.4 million or 20.2% to
$32.4 million from $27.0 million for 1995.

      Year Ended December 31, 1995 Compared with Year Ended December 31, 1994.
Net revenues increased 28.1% to $409.2 million for 1995 from $319.5 million for
1994. Excluding the impact of the 1995 acquisition of National Packaging
Systems, Inc., growth in net revenues was 23.8%. Net revenues from Covance's
combined clinical lines of business, excluding the newly acquired clinical
packaging business, grew in excess of 35%, generally as a result of the growth
in outsourcing of clinical development activities in 1995 as compared to 1994
and more specifically because of Covance's central laboratory's effort to
complete development work on several large protease inhibitor studies by the end
of 1995. Net revenues from Covance's preclinical business grew nearly 10%,
largely as a result of particularly strong growth in Europe, fueled by new
service offerings, overall volume increases and favorable foreign exchange rates
in 1995 compared to 1994.

      Cost of revenue increased 26.8% to $270.7 million or 66.2% of net revenues
for 1995 from $213.5 million or 66.8% of net revenues for 1994, as a result of
the increase in net revenues.

      Overall, selling, general and administrative expense increased 31.3% to
$64.2 million for 1995 from $48.9 million for 1994. As a percentage of net
revenues these costs increased to 15.7% for 1995 from 15.3% for 1994. Largely
contributing to the increase in selling, general and administrative expenses
were administrative costs associated with the establishment of Covance's new
biomanufacturing business, an increase in Covance's corporate center function,
strategic consulting expenses incurred to reorganize a large portion of
Covance's clinical operations into customer teams to better manage large scale
clinical trials and increased marketing initiatives such as the establishment of
a Lotus Notes(R) based centralized client contact database for use by Covance's
sales force, partially offset by a non-recurring charge incurred in 1994 in
connection with a separation payment made to Covance's then chief executive
officer upon his resignation.


                                                                              32

<PAGE>

      During 1995, Covance recorded a restructuring provision totaling $4.6
million ($2.8 million after tax) as a result of management's decision to
discontinue certain nonstrategic operations. The restructuring charge included
severance costs relating to approximately 90 employees of which approximately 50
had been terminated as of December 31, 1995. The remaining employees were
terminated and all other substantive activities to complete the restructuring
plan were completed by April 30, 1996. Severance benefits are being paid in the
form of salary continuation. The restructuring activities have occurred
substantially in accordance with the restructuring plan.

      Depreciation and amortization increased 19.2% to $22.1 million or 5.4% of
net revenues for 1995 from $18.5 million or 5.8% of net revenues for 1994 as the
growth in net revenues outpaced the increase in these non-cash charges.

      Income from operations increased $9.0 million or 23.2% to $47.6 million
for 1995 from $38.6 million for 1994. Excluding the impact of the 1995
restructuring provision, the increase in income from operations was $13.6
million or 35.2% to 12.8% of net revenues for 1995 from 12.1% of net revenues
for 1994.

      Other expense increased $0.9 million for 1995 to $4.5 million from $3.6
million for 1994. This increase is entirely a result of an increase in interest
expense relating principally to 1995 acquisition activity. Substantially all
borrowings to date have been from Corning.

      Covance's effective tax rate for 1995 increased slightly to 42.8% from
42.6% for 1994.

      Net income increased 23.3% to $24.2 million for 1995 from $19.6 million
for 1994. Excluding the impact of the 1995 restructuring provision, the increase
in net income was $7.4 million or 37.4% for 1995.

Quarterly Results

      Covance's quarterly operating results are subject to variation, and are
expected to continue to be subject to variation, as a result of factors such as
delays in initiating or completing significant preclinical and clinical and
periapproval trials, termination of preclinical and clinical and periapproval
trials, acquisitions and exchange rate fluctuations. Delays and terminations of
studies or trials are often the result of actions taken by clients or regulatory
authorities and are not typically controllable by Covance. Since a large amount
of Covance's operating costs are relatively fixed while revenue is subject to
fluctuation, minor variations in the commencement, progress or completion of
preclinical and clinical and periapproval trials may cause significant
variations in quarterly operating results.


                                                                              33
<PAGE>


      The following table presents unaudited quarterly operating results of
Covance for each of the ten most recent fiscal quarters in the period ended
December 31, 1996. In the opinion of Covance, this information has been prepared
on the same basis as the Audited Covance Financial Statements and reflects all
adjustments (consisting only of normal recurring adjustments) necessary for a
fair presentation of results of operations for those periods. This quarterly
financial data should be read in conjunction with the Audited Covance Financial
Statements included elsewhere herein. The operating results for any quarter are
not necessarily indicative of the results to be expected in any future period.


<TABLE>
<CAPTION>
                                                       Quarter Ended
                ---------------------------------------------------------------------------------------------------------
                Sept. 30, Dec. 31,   Mar. 31,  June 30,    Sept. 30,   Dec. 31,  Mar. 31,  June 30,    Sept. 30, Dec. 31,
                  1994      1994       1995      1995        1995        1995      1996      1996        1996      1996
                  ----      ----       ----      ----        ----        ----      ----      ----        ----      ----
                                                       (in thousands)
<S>            <C>       <C>        <C>       <C>         <C>         <C>       <C>        <C>        <C>        <C>
Net revenues.. $  82,904 $  84,612  $  91,974 $ 104,813   $ 106,099   $ 106,288 $ 108,697  $ 121,530  $ 127,179  $ 137,422
Operating
  expenses....    73,214    74,967     78,991    95,148      92,428      95,046    94,659    104,195    109,677    148,436
                 -------   -------    -------   -------    --------    --------  --------   --------   --------   --------

Income (loss) from
  operations..     9,690     9,645     12,983     9,665(b)   13,671      11,242    14,038     17,335     17,502    (11,014)(a)
Other expense,
  net.........     1,030       897      1,434     1,644         231       1,176     1,156      1,615      1,550      3,586
                 -------   -------    -------   -------   --------     --------  --------   --------   --------   --------

Pre-tax
  income (loss).   8,660     8,748     11,549     8,021(b)   13,440      10,066    12,882     15,720     15,952    (14,600)(a)
Income taxes..     3,693     3,732      4,953     3,423       5,771       4,298     5,619      6,861      6,931     (2,034)
Equity investee
  loss (gain).        --        87         49       149         153          54       (44)        29        (53)       (71)
                 -------   -------    -------   -------    --------    --------  --------   --------   --------   --------

Net income
  (Loss)...... $   4,967 $   4,929  $   6,547 $   4,449(b)$   7,516   $   5,714 $   7,307  $   8,830  $   9,074  $ (12,495)(a)
                 =======   =======    =======   =======    ========    ========  ========   ========   ========   ========
</TABLE>


- ----------

     (a) Excluding the impact of the fourth quarter 1996 spin-off related
         charge totaling $27,404 ($19,725 net of tax), income from operations,
         pre-tax income and net income were $16,390, $12,804 and $7,230
         respectively.

     (b) Excluding the impact of the second quarter 1995 restructuring provision
         totaling $4,616 ($2,770 net of tax), income from operations, pre-tax
         income and net income were $14,281, $12,637 and $7,219 respectively.


                                                                              34
<PAGE>


Liquidity and Capital Resources

      Historically, Covance had participated in the centralized treasury and
cash management processes of Corning. For domestic operations, cash received
from operations was generally transferred to Corning on a daily basis. For
international operations, excess cash was transferred to Corning periodically.
Cash disbursements for operations were funded as needed from Corning. From time
to time excess cash balances were maintained at Covance, generally for specific
cash requirements.

      In November 1996, Covance established the $250 million Credit Facility.
Covance borrowed $160 million in November 1996 under the Credit Facility to
repay Corning and affiliates for all of its intercompany borrowings and income
tax liabilities existing at that time. Under the Credit Facility, Covance has
several different interest rate options. Interest on all outstanding borrowings
under the Credit Facility is computed based upon the London Interbank Offered
Rate plus a margin. The Credit Facility expires in November 2001 and contains
various covenants which, among other things, may restrict Covance from engaging
in certain financing activities and prohibits Covance from paying cash dividends
on the Covance Common Stock during a default or an event of default, as defined
in the Credit Facility, or after giving effect to the payment of such dividends
Covance would not be in compliance with the financial covenants of the Credit
Facility. At December 31, 1996, Covance was in compliance with the terms of the
Credit Facility.

      Covance has now established a similar centralized cash management function
as had existed when Covance was a subsidiary of Corning, whereby cash received
from operations is generally swept daily, for domestic operations, and
periodically, for international operations, to a concentration account managed
centrally. Cash disbursements for operations are funded as needed from the
concentration account. From time to time excess cash balances are maintained at
Covance, generally for specific cash requirements.

      Covance's primary cash needs on both a short and long-term basis are for
capital expenditures, expansion of services, possible future acquisitions,
geographic expansion, working capital and other general corporate purposes.
Covance's management believes that the Credit Facility will provide it with
sufficient financial flexibility and ready access to cash on both a short-term
and a long-term basis to fund, as required, capital expenditures, potential
future acquisitions and other longer-term growth opportunities.

      During the year ended December 31, 1996, Covance's operations provided net
cash of $29.9 million, a decrease of $15.2 million from the corresponding 1995
amount. This reduction is attributable to a larger increase in working capital
during 1996 as compared to 1995. Working capital was $65.9 million at December
31, 1996, an increase of $47.4 million from the December 31, 1995 level of $18.5
million. This increase was primarily attributable to an increase in cash of
$17.3 million to $25.4 million at December 31, 1996 and to an increase in
aggregate accounts receivable and unbilled services of $35.8 million or 36.9% to
$133.0 million at December 31, 1996. Excluding the impact of acquisitions 


                                                                              35

<PAGE>

made in 1996, the aggregate increase in accounts receivable and unbilled
services was 29.1%. Covance initiated collection and contract management efforts
during the fourth quarter of 1996 to reduce the percentage increase in aggregate
accounts receivable and unbilled services to a level more consistent with the
increase in net revenues. While further progress still needs to be made, the
percentage increase in aggregate accounts receivable and unbilled services from
year end 1995 to year end 1996 is down from the 42.8% increase (35.7% excluding
acquisitions) experienced during the first nine months of 1996. Covance's ratio
of current assets to current liabilities was 1.43 at December 31, 1996 and 1.15
at December 31, 1995.

      Investing activities for the years ended December 31, 1996 and 1995
included acquisitions and capital spending to expand existing operations and
purchase equipment to enhance scientific technology capabilities. In March 1996,
Covance acquired Health Technology Associates, Inc. for a cash payment of
approximately $14.9 million. In October 1996, Covance acquired CRS Pacamed AG
for a cash payment of approximately $14.4 million, a new facility to house its
clinical packaging, clinical and periapproval services and health economics
operations in Europe for a cash payment of approximately $9.0 million and paid
$7.0 million in contingent purchase price in connection with Covance's 1995
acquisition of National Packaging Systems, Inc. During 1996, Covance spent
approximately $37.9 million on capital expenditures (excluding the October 1996
facility purchase of $9.0 million) for maintenance and upgrade of existing
equipment, outfitting of new facilities and computer equipment and software for
newly hired employees. Funding for new business acquisitions was provided
through borrowings from Corning.

      As described in Note 10 to the Audited Covance Financial Statements, a
Covance subsidiary, Covance Biotechnology, entered into an operating lease
arrangement in June 1995 whereby a custom-designed, fully equipped facility
would be constructed. The lease, which commenced in December 1996 upon
completion of construction of the facility, requires minimum annual lease
payments of approximately $5.3 million.

Foreign Currency

      Contracts between Covance's foreign subsidiaries and its clients are
frequently denominated in currencies other than the applicable subsidiary's
local currency. Accordingly, payments received for services rendered under such
contracts are denominated in a currency different than the currency used for the
payment of the subsidiary's expenses. Therefore, the subsidiary's net revenues,
expenses and earnings are affected by fluctuations in exchange rates. In
addition, Covance's consolidated financial statements are denominated in U.S.
dollars and, accordingly, changes in exchange rates between the applicable
foreign currency and the U.S. dollar will affect the translation of such
subsidiary's financial results into U.S. dollars for purposes of reporting
Covance's consolidated financial results. Translation adjustments are reported
as a separate section of stockholder's equity. To date, such adjustments have
not been material to Covance's financial statements.


                                                                              36

<PAGE>

Taxes

      Since Covance conducts operations on a global basis, Covance's effective
tax rate has and will continue to depend upon the geographic distribution of its
pretax earnings among locations with varying tax rates. Covance's profits are
further impacted by changes in the tax rates of the various jurisdictions. In
particular, as the geographic mix of Covance's pre-tax earnings among various
tax jurisdictions changes, Covance's effective tax rate may vary from period to
period. See Note 5 to the Audited Covance Financial Statements.

Inflation

      While most of Covance's net revenues are earned under contracts, the
long-term contracts (those in excess of one year) generally include an inflation
or cost of living adjustment for the portion of the services to be performed
beyond one year from the contract date. As a result Covance believes that the
effects of inflation generally do not have a material adverse effect on its
operations or financial condition.






                                                                              37
<PAGE>


Item 8.  Financial Statements and Supplementary Data


INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                                                                     Page
                                                                                                                     ----
<S>                                                                                                                   <C>
FINANCIAL STATEMENTS OF COVANCE INC.

     Report of Price Waterhouse LLP--Independent Accountants....................................................      39

     Consolidated Financial Statements:

       Consolidated Balance Sheets--December 31, 1996 and 1995..................................................      40

       Consolidated Statements of Income--Years ended December 31, 1996, 1995 and 1994..........................      41

       Consolidated Statements of Cash Flows--Years ended December 31, 1996, 1995 and 1994......................      42

       Consolidated Statements of Stockholders' Equity--Years ended
         December 31, 1996, 1995 and 1994.......................................................................      43

       Notes to Consolidated Financial Statements...............................................................      44
</TABLE>


                                                                              38
<PAGE>


                        REPORT OF INDEPENDENT ACCOUNTANTS

      To the Board of Directors and Stockholders of Covance Inc.

      In our opinion, the accompanying consolidated balance sheets and the
related consolidated statements of income, of cash flows and of stockholders'
equity appearing on pages 40 through 56 present fairly, in all material
respects, the financial position of Covance Inc. and its subsidiaries at
December 31, 1996 and 1995, and the results of their operations and their cash
flows for each of the three years in the period ended December 31, 1996, in
conformity with generally accepted accounting principles. These financial
statements are the responsibility of the Company's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these statements in accordance with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements are
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audits provide a reasonable basis for the opinion expressed
above.


/s/ Price Waterhouse LLP
Price Waterhouse LLP
Morristown, NJ
January 27, 1997













                                                                              39
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS
                           DECEMBER 31, 1996 AND 1995

<TABLE>
<CAPTION>
(Dollars in thousands)                                                          1996                        1995
                                                                                -----                       -----
<S>                                                                            <C>                        <C>
Assets
Current Assets:
    Cash and cash equivalents..........................................        $  25,416                  $  8,068
    Accounts receivable, net...........................................           93,700                    78,968
    Unbilled services..................................................           39,313                    18,217
    Inventory..........................................................           16,410                    14,004
    Deferred income taxes..............................................           17,529                    11,337
    Prepaid expenses and other assets..................................           25,526                    15,189
                                                                                --------                  --------
        Total Current Assets...........................................          217,894                   145,783
Property and equipment, net............................................          167,809                   140,708
Goodwill, net..........................................................           53,271                    24,028
Other assets...........................................................           12,073                    11,991
                                                                                --------                  --------
        Total Assets...................................................         $451,047                  $322,510
                                                                                ========                  ========
Liabilities and Stockholders' Equity
Current Liabilities:
    Trade accounts payable.............................................         $ 26,652                  $ 23,761
    Accrued payroll and benefits.......................................           28,212                    20,339
    Accrued expenses and other liabilities.............................           35,840                    24,701
    Unearned revenue...................................................           57,794                    41,879
    Income taxes payable...............................................            3,450                    16,631
                                                                                --------                  --------
        Total Current Liabilities......................................          151,948                   127,311

Long-term Debt.........................................................          163,000                        --
Due to Corning Incorporated and affiliates.............................               --                    89,836
Deferred income taxes..................................................            9,957                     6,406
Other liabilities......................................................           15,438                    16,440
                                                                                --------                  --------
        Total Liabilities..............................................          340,343                   239,993
                                                                                --------                  --------
Commitments and Contingent Liabilities
Stockholders' Equity:
    Common stock - Par value $0.01 per share; 140,000,000
       shares authorized; 57,063,644 shares issued and
       outstanding at December 31, 1996................................              571                        --
    Additional paid-in capital.........................................           48,970                    30,816
    Retained earnings..................................................           58,010                    48,653
    Cumulative translation adjustment..................................            3,153                     3,048
                                                                                --------                  --------
        Total Stockholders' Equity.....................................          110,704                    82,517
                                                                                --------                  --------
        Total Liabilities and Stockholders' Equity.....................         $451,047                  $322,510
                                                                                ========                  ========
</TABLE>




   The accompanying notes are an integral part of these financial statements.


                                                                              40
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
                        CONSOLIDATED STATEMENTS OF INCOME
              FOR THE YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994

<TABLE>
<CAPTION>
(Dollars in thousands, except per share data)                                1996               1995              1994
                                                                            -----              ------             ------
<S>                                                                      <C>                  <C>               <C>       
Net revenues...................................................          $ 494,828            $ 409,174          $  319,501
Cost and expenses
  Cost of revenue..............................................            324,345              270,726             213,490
  Selling, general and administrative expenses.................             80,014               64,201              48,892
  Spin-off related charge......................................             27,404                   --                  --
  Restructuring charge.........................................                 --                4,616                  --
  Depreciation and amortization................................             25,204               22,070              18,520
                                                                          --------             --------            --------
      Total....................................................            456,967              361,613             280,902
                                                                          --------             --------            --------
Income from operations.........................................             37,861               47,561              38,599
                                                                          --------             --------            --------
Other expense (income)
  Interest expense, net........................................              6,791                5,269               4,307
  Foreign exchange loss (gain).................................              1,116                 (784)              (712)
                                                                          --------             --------            --------
                                                                             7,907                4,485               3,595
                                                                          --------             --------            --------
Income before taxes and equity investee (gain) loss............             29,954               43,076              35,004
Taxes on income................................................             17,377               18,445              14,924
Equity investee (gain) loss....................................               (139)                 405                 435
                                                                          --------             --------            --------
Net income.....................................................          $  12,716            $  24,226           $  19,645
                                                                          ========             ========            ========

Earnings per share.............................................            $  0.22                  N/A                 N/A

Weighted average shares outstanding............................         57,063,644                  N/A                 N/A
</TABLE>








   The accompanying notes are an integral part of these financial statements.


                                                                              41
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
              FOR THE YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994

<TABLE>
<CAPTION>

(Dollars in thousands)                                                       1996               1995              1994
                                                                             -----             ------            ------
<S>                                                                          <C>                <C>               <C>
Cash flows from operating activities
Net income..........................................................         $ 12,716           $ 24,226          $ 19,645
Adjustments to reconcile net income to net
 cash provided by operating activities:
    Depreciation and amortization...................................           25,204             22,070            18,520
    ESOP component of spin-off related charge.......................           16,673                 --                --
    Restructuring reserve, net of cash paid.........................               --              2,965                --
    Deferred income tax provision...................................           (3,188)            (4,503)           (1,502)
    Related party charges...........................................            2,052              3,288             3,504
    Other...........................................................              237              1,266             1,375
Changes in operating assets and liabilities, net of effects
 of acquisitions
    Accounts receivable.............................................          (12,444)           (10,082)          (11,706)
    Unbilled services...............................................          (18,568)            (5,023)            2,058
    Inventory.......................................................           (1,911)            (2,576)             (603)
    Accounts payable................................................            2,327              6,783             4,372
    Accrued liabilities.............................................           15,800             11,669             7,550
    Unearned revenue................................................           14,701             (7,556)            2,894
    Income taxes payable............................................          (13,606)             8,673               194
    Other assets and liabilities, net...............................          (10,135)            (6,094)           (3,369)
                                                                              -------            -------           -------
Net cash provided by operating activities...........................           29,858             45,106            42,932
                                                                              -------            -------           -------
Cash flows from investing activities
    Capital expenditures............................................          (46,941)           (34,792)          (25,242)
    Acquisition of businesses, net of cash acquired.................          (33,883)           (14,000)          (10,789)
    Other, net......................................................               34                571            (2,432)
                                                                              -------            -------           -------
Net cash used in investing activities...............................          (80,790)           (48,221)          (38,463)
                                                                              -------            -------           -------
Cash flows from financing activities
    Proceeds from Long-term debt....................................          160,000                 --                --
    Due to Corning Incorporated and affiliates......................          (88,361)            14,236             6,079
    Capital contributions...........................................               --              1,000                --
    Dividends paid to Corning.......................................           (3,359)           (10,229)           (9,465)
                                                                              -------            -------           -------
Net cash provided by (used in) financing activities.................           68,280              5,007            (3,386)
                                                                              -------            -------           -------
Net change in cash and cash equivalents.............................           17,348              1,892             1,083
Cash and cash equivalents, beginning of year........................            8,068              6,176             5,093
                                                                              -------            -------           -------
Cash and cash equivalents, end of year..............................        $  25,416           $  8,068          $  6,176
                                                                              =======            =======           =======
</TABLE>




   The accompanying notes are an integral part of these financial statements.


                                                                              42
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
              FOR THE YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994


<TABLE>
<CAPTION>
                                                                  Additional                     Cumulative        Total
                                                   Common           Paid-in        Retained      Translation   Stockholders'
(Dollars in thousands)                              Stock           Capital        Earnings      Adjustment       Equity
                                                  --------         --------         -------       ---------      ---------
<S>                                                    <C>          <C>             <C>           <C>             <C>      
Balance, December 31, 1993..................              --        $ 23,024        $ 24,476      $  1,888        $  49,388
Net income..................................              --              --          19,645            --           19,645
Dividends paid to Corning...................              --              --          (9,465)           --           (9,465)
Capital contribution........................              --           3,504              --            --            3,504
Currency translation adjustment.............              --              --              --           836              836
                                                     -------         -------         -------        ------          -------
Balance, December 31, 1994..................              --          26,528          34,656         2,724           63,908
Net income..................................              --              --          24,226            --           24,226
Dividends paid to Corning...................              --              --         (10,229)           --          (10,229)
Capital contribution........................              --           4,288              --            --            4,288
Currency translation adjustment.............              --              --              --           324              324
                                                     -------         -------         -------        ------          -------
Balance, December 31, 1995..................              --          30,816          48,653         3,048           82,517
Net income..................................              --              --          12,716            --           12,716
Dividends paid to Corning...................              --              --          (3,359)           --           (3,359)
Capital contribution........................              --           2,052              --            --            2,052
Adjustment to reflect par value
 of shares issued in spin-off
 (56,208,644 shares)........................           $ 562            (562)             --            --               --
ESOP contribution (855,000 shares)..........               9          16,664              --            --           16,673
Currency translation adjustment.............              --              --              --           105              105
                                                     -------         -------         -------        ------          -------
Balance, December 31, 1996..................           $ 571        $ 48,970        $ 58,010      $  3,153        $ 110,704
                                                     =======         =======         =======        ======          =======
</TABLE>

















   The accompanying notes are an integral part of these financial statements.


                                                                              43
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
               (Dollars in thousands, unless otherwise indicated)


1.  Organization and Spin-off

      Organization

      Covance Inc. and its subsidiaries ("Covance") is a leading contract
research organization providing a wide range of integrated product development
services on a worldwide basis to the biotechnology, pharmaceutical and medical
device industries. Also, Covance provides services such as health economics for
managed care organizations, hospitals and health care provider networks, and
early development and laboratory testing services to the chemical, agrochemical
and food industries. Covance's operations involve a single industry segment for
financial reporting purposes. At the present time, operations are principally
focused in the United States and Europe.

      Spin-off

      Prior to December 31, 1996, Covance was an indirect wholly-owned business
of Corning Incorporated ("Corning"). In May 1996, Corning's Board of Directors
approved a plan to distribute to its stockholders on a pro rata basis all of its
ownership interest in Covance (the "Spin-Off Distribution"). The intent of the
plan was to create an independent, publicly-owned company (Covance). In June
1996, Corning submitted to the Internal Revenue Service ("IRS") a request for a
ruling that the Spin-Off Distribution qualify as a tax free distribution under
the Internal Revenue Code of 1986, as amended. In November 1996, the IRS
approved that request. In November 1996, Corning's Board of Directors approved
the final terms of the Spin-Off Distribution, and effective December 31, 1996
the Spin-Off Distribution was complete. Under the terms of the Spin-Off
distribution, shareholder's of record of Corning common stock on December 31,
1996 received one share of Covance common stock for each four shares of Corning
common stock held. As a result of the Spin-Off Distribution, Covance issued
approximately 56.2 million shares of its common stock.

      In connection with the Spin-Off distribution, Covance recorded a one-time
charge totaling $27.4 million ($19.7 million net of tax), consisting of the cost
of establishing and funding two employee stock ownership plans (collectively,
the "ESOP") and the direct costs incurred to effect the Spin-Off distribution.
The ESOP component of the charge, which totaled $16.7 million, represents the
fair market value of the shares (approximately 855,000) issued into the ESOP.
The direct costs consist primarily of accounting, legal and other professional
fees associated with Covance being established as a separate publicly traded
entity.


2.  Summary of Significant Accounting Policies

      Principles of Consolidation

      The consolidated financial statements include the accounts of all entities
controlled by Covance, including Covance Biotechnology, a majority owned
business. All significant intercompany accounts and transactions are eliminated.
The equity method of accounting is used for investments in affiliates in which
Covance owns between 20 and 50 percent.


                                                                              44
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


      Use of Estimates

      The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities,
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from these estimates.

      Foreign Currencies

      For subsidiaries outside of the United States that operate in a local
currency environment, assets and liabilities are translated to United States
dollars at year-end exchange rates. Income and expense items are translated at
average rates of exchange prevailing during the year. Translation adjustments
are accumulated in a separate component of stockholders' equity. Transaction
gains and losses are included in the determination of income.

      Cash and Cash Equivalents

      Cash and cash equivalents include all highly liquid investments with an
original maturity of three months or less at date of purchase and consist
principally of amounts temporarily invested in money market funds.

      Financial Instruments

      The fair value of cash, accounts receivable, trade accounts payable and
accrued expenses are not materially different than their carrying amounts as
reported at December 31, 1996 and 1995.

      Accounts receivable and unbilled services from Covance customers are
concentrated primarily in the pharmaceutical and biotechnology industries.
Covance monitors the creditworthiness of its customers to which it grants credit
terms in the ordinary course of business. Although Covance customers are
concentrated primarily within these two industries, management considers the
likelihood of material credit risk exposure as remote. Covance in some cases
requires advance payment for a portion of the contract price from its customers
upon the signing of a contract for services. Historically, bad debts have been
minimal.

      Inventory

      Inventories, which consist principally of supplies, are valued at the
lower of cost (first-in, first-out method) or market.

      Property and Equipment

      Property and equipment are recorded at cost. Depreciation and amortization
are provided on the straight line method at rates adequate to allocate the cost
of the applicable assets over their estimated useful lives, which range in term
from three to thirty years.


                                                                              45
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


      Goodwill

      Goodwill (investment costs in excess of the fair value of net tangible
assets acquired) is capitalized and amortized on a straight-line basis over the
period expected to be benefited, which ranges from twenty to forty years.

      Impairment of Long-Lived Assets

      Statement of Financial Accounting Standards No. 121, "Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of"
("SFAS No. 121"), was adopted in 1995. Assessments of the recoverability of
long-lived assets are conducted when events or changes in circumstances occur
that indicate that the carrying value of the asset may not be recoverable. The
assessment of possible impairment is based upon the ability to recover the asset
from the expected future undiscounted cash flows of related operations. The
policy on impairment prior to the adoption of SFAS No. 121 was not materially
different.

      Revenue Recognition

      Revenue is recognized using the cost-to-cost type of
percentage-of-completion method of accounting for services rendered in
connection with contractual arrangements, which generally range from a few
months to two years. Revenue is recognized as costs are incurred on the basis of
the relationship between costs incurred and total estimated costs. Contracts may
contain provisions for renegotiation in the event of cost overruns due to
changes in the level of work scope. Renegotiated amounts are included in revenue
when earned and realization is assured. Provisions for losses to be incurred on
contracts are recognized in full in the period in which it is determined that a
loss will result from performance of the contractual arrangement. Most service
contracts may be terminated for a variety of reasons by Covance's customers
either immediately or upon notice. The contracts often require payments to
Covance to recover costs incurred, including costs to wind down the study and
fees earned to date, and in some cases to provide Covance with a portion of the
fees or profits that would have been earned under the contract had the contract
not been terminated early.

      Revenue from performing clinical laboratory testing services is recognized
as tests are completed. Revenue from other activities is recognized as services
are performed or products are shipped.

      Unbilled receivables are recorded for revenue recognized to date that is
currently unbillable to the customer pursuant to contractual terms. In general,
amounts become billable upon the achievement of milestones or in accordance with
predetermined payment schedules. Unbilled receivables are billable to customers
within one year from the respective balance sheet date. Unearned revenue is
recorded for advance billings to customers for which revenue has not been
recognized at a given date.

      Covance routinely subcontracts with independent physician investigators in
connection with multi-site clinical trials. Investigator fees are not reflected
in revenue or expense since such fees are granted by customers on a "pass-thru
basis" without risk or reward to Covance.


                                                                              46

<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


      Costs and Expenses

      Cost of revenue generally includes appropriate amounts necessary to
complete the revenue earning process and encompass direct labor and related
benefit charges, other direct costs and allocable expenses (including facility
charges, indirect labor and information technology costs). Selling, general and
administrative expenses primarily consist of administrative payroll and related
benefit charges, advertising and promotional expenses, administrative travel and
allocable expenses (facility charges and information technology costs).
Advertising expense is recognized as incurred.

      Taxes on Income

      Covance uses the asset and liability method of accounting for income
taxes. Under this method, deferred tax assets and liabilities are recognized for
the expected future tax consequences of differences between the carrying amounts
of assets and liabilities and their respective tax bases using enacted tax rates
in effect for the year in which the temporary differences are expected to
reverse. The effect on deferred taxes of a change in enacted tax rates is
recognized in income in the period when the change is effective.

      Earnings per share

      Earnings per share is computed by dividing net income by the weighted
average number of shares outstanding. Earnings per share has been presented for
1996 based upon the number of Covance shares issued and outstanding as a result
of the Spin-Off Distribution. Historical earnings per share has not been
presented for periods prior to 1996 because Covance's status as a wholly-owned
business of Corning for such periods does not permit a determination of the
number of shares outstanding on a comparable or consistent basis. Common stock
equivalents are not included in the earnings per share computation because they
do not result in material dilution.


3.  Property and Equipment

      Property and equipment at December 31, 1996 and 1995 consist of the
following:

<TABLE>
<CAPTION>
                                                                                     1996                1995
                                                                                     -----               -----
<S>                                                                                <C>                 <C>
Property and equipment at cost:
  Land...................................................................          $   6,859           $   2,996
  Buildings and improvements.............................................            116,176             105,291
  Equipment..............................................................            136,711             101,686
  Furniture, fixtures & leasehold improvements...........................             41,116              39,622
  Construction-in-progress...............................................              4,025               5,861
                                                                                    --------            --------
                                                                                     304,887             255,456
Less: Accumulated depreciation and amortization..........................           (137,078)           (114,748)
                                                                                    --------            --------
Property and equipment...................................................          $ 167,809            $140,708
                                                                                    ========            ========
</TABLE>


      Depreciation and amortization expense aggregated $23.2 million, $20.8
million and $17.8 million for 1996, 1995 and 1994, respectively.


                                                                              47

<PAGE>

                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


4.  Acquisitions and Goodwill

      In October 1996, Covance acquired the stock of CRS Pacamed AG (now known
as Covance Pharmaceutical Packaging Services AG) for a cash payment of
approximately $14.4 million in a transaction accounted for as a purchase
business combination. The goodwill resulting from this transaction aggregated
$10.3 million.

      In March 1996, Covance acquired all of the assets and substantially all of
the liabilities of Health Technology Associates, Inc. ("HTA", now known as
Covance Health Economics and Outcomes Services Inc.) for an initial cash payment
of approximately $14.9 million in a transaction accounted for as a purchase
business combination. In accordance with the terms of the asset purchase
agreement, Covance is contingently obligated to pay up to an additional $17.2
million in contingent purchase price if HTA achieves certain established
earnings targets for the three year period ending March 1999. The goodwill
resulting from the initial cash payment on this transaction aggregated $13.7
million.

      In January 1995, Covance acquired National Packaging Systems, Inc. ("NPS",
now known as Covance Pharmaceutical Packaging Services Inc.) for an initial cash
payment of $14.0 million in a transaction accounted for as a purchase business
combination. In October 1996, Covance paid, pursuant to the terms of the
acquisition agreement, an additional $7.0 million in contingent purchase price
to former NPS shareholders as NPS achieved certain established earnings targets
for the period January 1995 through September 1996. The goodwill resulting from
this transaction aggregated $16.1 million.

      In April 1994, Covance acquired SciCor S.A. (now known as Covance Central
Laboratory Services SA), a provider of laboratory testing services domiciled in
Switzerland, for total consideration of approximately $10.8 million in a
transaction accounted for as a purchase business combination. The goodwill
resulting from this transaction aggregated $9.5 million.

      Results of operations for these entities have been included in the
accompanying financial statements beginning on the respective dates of
acquisition. Pro forma information for these entities has not been presented,
due to their insignificance to Covance taken as a whole.

      Goodwill associated with these and prior acquisitions aggregated $53.3
million and $24.0 million, net of accumulated amortization of $5.2 million and
$3.5 million at December 31, 1996 and 1995, respectively. Amortization expense
aggregated $1.7 million, $0.9 million and $0.5 million for 1996, 1995 and 1994,
respectively.


                                                                              48
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


5.  Taxes on Income

      Historically, Covance and its subsidiaries have operated under a tax
sharing agreement with Corning, pursuant to which they were required to compute
their provision for income taxes on a separate return basis and pay to Corning
the separate Federal income tax return liability so computed. Covance's
operations through December 31, 1996 will be included in the Federal income tax
return filed by Corning.

      In connection with the Spin-Off Distribution, Covance entered into a tax
indemnification agreement with Corning and a former affiliate of Corning that
prohibits Covance for a period of two years after the date of the Spin-Off
Distribution from taking certain actions that might jeopardize the favorable tax
treatment of the Spin-Off Distribution under Section 355 of the Internal Revenue
Code of 1986, as amended, and will provide Corning and the former affiliate of
Corning with certain rights of indemnification against Covance. The tax
indemnification agreement will also require Covance to take such actions as
Corning and the former affiliate of Corning may request to preserve the
favorable tax treatment provided for in any rulings obtained from the Internal
Revenue Service in respect of the Spin-Off Distribution.

      Covance also entered into a tax sharing agreement with Corning and a
former affiliate of Corning which allocates responsibility for federal, state
and local taxes relating to taxable periods before the Spin-Off Distribution and
provides for computing and apportioning tax liabilities and tax benefits for
such periods.

      The components of income before taxes and the related provision (benefit)
for taxes on income for 1996, 1995 and 1994 are as follows:

<TABLE>
<CAPTION>
                                                            1996                 1995                1994
                                                            -----                -----              ------
<S>                                                        <C>                  <C>                 <C>
Income before taxes and equity investee (gain) loss:
    Domestic...................................            $23,259              $ 32,771            $ 30,928
    International..............................              6,695                10,305               4,076
                                                            -------              -------             -------
      Total....................................            $29,954              $ 43,076            $ 35,004
                                                            =======              =======             =======
Federal income taxes:
    Current provision..........................            $17,108              $ 19,118            $ 12,167
    Deferred benefit...........................             (6,311)               (6,760)             (1,742)
International income taxes:
    Current (benefit) provision................              1,248                  (933)                602
    Deferred provision.........................              1,635                 3,434               1,440
State and other income taxes:
    Current provision..........................              4,174                 3,959               2,868
    Deferred benefit...........................               (477)                 (373)               (411)
                                                            -------              -------             -------
        Net income tax provision...............            $17,377              $ 18,445            $ 14,924
                                                            =======              =======             =======
</TABLE>


                                                                              49

<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)

      The differences between the provision for income taxes and income taxes
computed using the Federal statutory income tax rate for 1996, 1995 and 1994 are
as follows:

<TABLE>
<CAPTION>
                                                                 1996                 1995                1994
                                                                 -----                -----               -----
<S>                                                               <C>                 <C>                  <C>  
Taxes at statutory rate..............................             35.0%               35.0%                35.0%
State and local taxes, net of Federal benefit........              8.0                 5.5                  4.6
Non-deductible spin-off related charge...............              7.1                  --                   --
Goodwill amortization................................              2.1                 1.1                  0.5
Impact of international operations...................              1.8                (0.3)                 1.7
Other, net...........................................              4.0                 1.5                  0.8
                                                                  ----                ----                 ----
        Total........................................             58.0%               42.8%                42.6%
                                                                  ====                ====                 ====
</TABLE>

      The tax effects of temporary differences that give rise to significant
portions of the deferred tax assets and liabilities at December 31, 1996 and
1995 are as follows:

<TABLE>
<CAPTION>
                                                                      1996                           1995
                                                                      -----                          -----
<S>                                                                  <C>                          <C>
Current deferred tax assets:
    Liabilities not currently deductible...................          $15,571                      $  10,356
    Net operating losses...................................            2,332                            888
    Other..................................................              792                            538
                                                                     -------                        -------
    Gross current deferred tax assets......................           18,695                         11,782
    Less: valuation allowance..............................           (1,166)                          (445)
                                                                     -------                        -------
    Net current deferred tax assets........................          $17,529                       $ 11,337
                                                                     =======                        =======
Noncurrent deferred tax assets:
    Liabilities not currently deductible...................          $ 5,256                       $  5,857
    Less: valuation allowance..............................           (1,212)                            --
                                                                     -------                        -------
    Net noncurrent deferred tax assets.....................            4,044                          5,857
Noncurrent deferred tax liabilities:
    Property and equipment.................................          (14,001)                       (12,263)
                                                                     -------                        -------
    Net noncurrent deferred tax liabilities................         $ (9,957)                      $ (6,406)
                                                                     =======                        =======
</TABLE>


      Income taxes payable at December 31, 1996 consist primarily of liabilities
for state and international income taxes, while income taxes payable at December
31, 1995 consist of Federal income taxes payable to Corning of $17.0 million,
state and other income taxes payable of $1.6 million and international income
taxes receivable of $2.0 million. Covance paid income taxes of $25.5 million,
$16.7 million and $17.0 million for the years 1996, 1995 and 1994, respectively.

      Covance currently provides income taxes on the earnings of foreign
subsidiaries to the extent they are taxable or expected to be remitted. Taxes
have not been provided on $18.9 million of accumulated foreign unremitted
earnings because those earnings are expected to remain invested indefinitely. It
is not practical to estimate the amount of additional tax that might be payable
if such accumulated earnings were remitted. Additionally, if such accumulated
earnings were remitted, certain countries impose withholding taxes that, subject
to certain limitations, are available for use as a tax credit against any
Federal income tax liability arising from such remittance.


                                                                              50
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)

6.  Long-Term Debt

      In connection with being established as a separate publicly traded
company, Covance negotiated a five year $250 million senior revolving credit
facility (the "Credit Facility") with a syndicate of banks. Under the Credit
Facility, borrowings can be made in a number of different currencies until the
fifth anniversary thereof at which time all outstanding loans must be paid in
full. Under the Credit Facility, Covance has several different interest rate
options. Interest on all outstanding borrowings during 1996 was computed based
upon the London Interbank Offered Rate ("LIBOR") plus an applicable margin.
Covance has the option to prepay the loans outstanding under the Credit Facility
in whole or in part at any time, subject to payment of breakage costs, in
certain circumstances. The Credit Facility contains certain covenants and
requires the maintenance of key ratios, as defined in the Credit Facility.

      In order to repay Corning and affiliates for intercompany borrowings and
income tax liabilities, Covance borrowed $160.0 million under the Credit
Facility in November 1996. For the period of time during 1996 that this
borrowing was outstanding, interest was incurred at the rate of approximately
6.0% per annum.


7.  Employee Benefit Plans

      Covance has several defined contribution plans covering substantially all
of its full-time employees. Contributions to these plans aggregated $6.6
million, $4.9 million and $4.2 million for 1996, 1995 and 1994, respectively.


8.  Stockholders' Equity

      Preferred Stock

      Covance is authorized to issue up to 10.0 million shares of Series
Preferred Stock, par value $1.00 per share (the "Covance Series Preferred
Stock"). The Covance Board of Directors has the authority to issue such shares
from time to time, without stockholder approval, and to determine the
designations, preferences, rights, including voting rights, and restrictions of
such shares, subject to the Delaware General Corporate Laws. Pursuant to this
authority, the Covance Board of Directors has designated 1.0 million shares of
the Covance Series Preferred Stock as Covance Series A Preferred Stock. No other
class of Covance Series Preferred Stock has been designated by the Board. As of
December 31, 1996 no Covance Series Preferred Stock has been issued or is
outstanding.

      Dividends - Common Stock

      While owned by Corning, Covance paid to Corning dividends of $3.4 million,
$10.2 million and $9.5 million during 1996, 1995 and 1994, respectively. As a
separate publicly traded company, Covance's Board of Directors may declare
dividends on the shares of Covance Common Stock out of legally available funds
(subject to any preferential rights of any outstanding Covance Series Preferred
Stock). However, Covance has no present intention to declare dividends for the
foreseeable future, but instead intends to retain earnings to provide funds for
the operation and expansion of its business. In addition, the Credit Facility
prohibits Covance from paying cash dividends on the Covance Common Stock during
a default or event of default, as defined in the Credit Facility, or after
giving effect to the payment of such dividends Covance would not be in
compliance with the financial covenants of the Credit Facility.


                                                                              51

<PAGE>

                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


      Stock Compensation Plans

      In December 1996, Covance adopted, in connection with the Spin-Off
Distribution, the Employee Equity Participation Program ("EEPP"). The EEPP
consists of two plans: (a) a stock option plan (the "Covance Stock Option
Plan"); and (b) an incentive stock plan (the "Covance Incentive Stock Plan").
The EEPP, which is administered by the Covance Compensation Committee of the
Board of Directors, provides for the grant to eligible employees of either
non-qualified or incentive stock options, or both, to purchase shares of Covance
common stock at no less than fair market value on the date of grant. Options
granted are not exercisable for at least twelve months and expire no more than
ten years from date of grant. The EEPP also authorizes the Covance Compensation
Committee to award eligible employees shares, or the right to receive shares, of
Covance common stock. The shares awarded may be subject to certain restrictions
prohibiting sale or other disposition and may be subject to forfeiture, in
certain circumstances. A maximum of 6.0 million shares may be optioned or
granted to eligible employees under the EEPP.

      Also in December 1996, Covance adopted a stock purchase plan (the "Covance
Stock Purchase Plan") pursuant to which Covance may make available for sale to
employees shares of its common stock at a price equal to 85% of the lower of the
market value on the first or last day of each calendar quarter. The Covance
Stock Purchase Plan, which is administered by the Covance Compensation
Committee, is intended to give Covance employees the opportunity to purchase
shares of Covance common stock through payroll deduction. A maximum of 1.0
million shares may be purchased by Covance Employees under the Covance Stock
Purchase Plan.

      From 1990 through 1996, certain employees of Covance were granted
restricted stock awards or options, or both, to purchase shares of Corning
common stock under existing Corning stock award and option plans. In connection
with the Spin-Off Distribution, options outstanding under the Corning stock
option plans held by Covance employees and restricted share awards made to
Covance employees were replaced by substitute awards under a newly established
conversion plan (the "Covance Conversion Plan"). The Covance Conversion Plan has
essentially all of the same characteristics as the EEPP. The replacement stock
awards have the same terms and conditions as the Corning stock awards they
replaced. The replacement stock options have the same vesting provisions, option
periods and other terms and conditions and retain the same ratio of exercise
price per share to market value per share and the same aggregate difference
between market value and exercise price as the Corning stock options they
replaced.

      Covance has adopted the disclosure-only provisions of SFAS No. 123,
"Accounting for Stock-Based Compensation", and accordingly, applies Accounting
Principles Board Opinion No. 25 and related interpretations in accounting for
its plans. Had Covance elected to recognize compensation expense, in accordance
with the provisions of SFAS No. 123, for the stock option awards granted under
the Corning stock option plans to Covance employees and for the stock purchased
by Covance employees under the Corning employee stock purchase program, its net
income in 1996 and 1995 would have been $10.8 million and $23.8 million,
respectively, and its earning per share in 1996 would have been $0.19. The fair
value of the Corning stock options used to compute the pro forma net income and
earnings per share disclosures is the estimated present value at grant date
using the Black-Scholes option-pricing model with the following weighted average
assumptions: expected volatility of 24.5%; risk free interest rate of 5.5% to
7.2%; and an expected holding period of five years.


                                                                              52
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


      The following table sets forth on a pro forma basis the stock option
activity during 1996, 1995 and 1994 for the Covance stock options issued in
replacement of the Corning stock options under the Covance Conversion Plan
(grant dates are original Corning option grant dates):

<TABLE>
<CAPTION>
                                                                        Number                    Weighted
                                                                       of Shares                   Average
                                                                    (in thousands)                  Price
                                                                      -----------                 ---------
  <S>                                                                   <C>                       <C>
                 Pro Forma:
  Options outstanding, January 1, 1994.....................                67.5                   $13.21
  Granted..................................................               429.1                   $15.28
                                                                         ------
  Options outstanding, January 1, 1995.....................               496.6                   $15.43
  Granted..................................................               306.0                   $15.81
  Exercised................................................                (0.3)                  $11.66
                                                                         ------
  Options outstanding, December 31, 1995...................               802.3                   $15.58
  Granted..................................................               268.6                   $17.61
  Exercised................................................                (8.4)                  $13.43
                                                                         ------
  Options outstanding, December 31, 1996...................             1,062.5                   $16.11
                                                                         ======
</TABLE>

      The weighted average fair value of the stock options granted during 1996,
calculated using the Black-Scholes option-pricing model with the assumptions as
set forth above, is $6.20 per share.



      The following table sets forth the status of the options outstanding at
December 31, 1996:

<TABLE>
<CAPTION>
                                            Stock Options Outstanding                        Stock Options Exercisable
                                     --------------------------------------                   -----------------------
                                                      Weighted
             Option              Number                Average            Weighted            Number            Weighted
              Price             of Shares             Remaining            Average           of Shares           Average
              Range          (in thousands)       Contractual Life          Price         (in Thousands)          Price
           -----------         -----------          -------------         ---------        ------------         ---------
      <S>                         <C>                  <C>                  <C>                 <C>               <C>
      $11.66 - $16.49             787.2                8.1 years            $15.58              212.8             $15.23
      $16.50 - $19.57             275.3                9.3 years            $17.63                3.7             $18.40
</TABLE>

      In connection with the Spin-Off Distribution, Covance established two
employee stock ownership plans (collectively, the "ESOP") for the benefit of all
active Covance employees as of December 31, 1996. Covance contributed
approximately 855,000 shares of its common stock into the ESOP. The shares
contributed were allocated among the plan participants based upon a percentage
of each employees annual compensation. As a result of this contribution, Covance
recorded a one-time charge of $16.7 million, representing the fair market value
of the shares issued into the ESOP.


                                                                              53
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


9.  Restructuring Charge

      In 1995, Covance recorded a provision for restructuring charges totaling
$4.6 million as a result of management's decision to discontinue certain
nonstrategic operations. The restructuring charge consisted of employee
termination costs of $1.5 million (relating to approximately 90 employees), the
write-off of fixed assets of $1.7 million and costs of exiting leased facilities
of $1.4 million. During 1995 approximately 50 of the employees had been
terminated and a total of approximately $1.7 million had been charged against
the restructuring reserve. During 1996, the remaining 40 employees were
terminated and all other substantive activities to complete the restructuring
plan were completed. At December 31, 1996 approximately $1.0 million in
restructuring reserves remain relating to facility lease obligations, which are
expected to be paid during 1997.


10.  Commitments and Contingent Liabilities

      Minimum rental commitments under noncancellable operating leases,
primarily office and laboratory facilities (including the Covance Biotechnology
facility), in effect at December 31, 1996 are as follows:

           Year ended December 31,
           1997...........................................       $24,514
           1998...........................................       $21,434
           1999...........................................       $18,910
           2000...........................................       $16,183
           2001...........................................       $13,169
           2002 and beyond................................       $20,619

      Operating lease rental expense aggregated $16.1 million, $14.1 million and
$11.0 million for 1996, 1995 and 1994, respectively.

      In June 1995, Covance Biotechnology ("lessee") entered into a lease
arrangement whereby a custom-designed, fully equipped facility would be
constructed for the lessee at a cost of approximately $55 million to perform
specialized research and manufacturing activities for biotechnology and
pharmaceutical companies. The lessor in this arrangement is a subsidiary of one
of the largest banks in the United States. The lease arrangement contains
purchase and cancellation options for the lessee at any time during the ten year
period covered by the lease arrangement. Although the lease arrangement is
cancelable by the lessee at any time throughout the ten year period, an initial
lease term of five years, representing management's estimate at the lease
inception date of the period in which occupancy of the facility is reasonably
assured, has been selected for financial reporting purposes. The initial term of
the lease commenced in December 1996, upon completion of construction of the
facility. The annual minimum lease payments total approximately $5.3 million.
The lease arrangement is classified as an operating lease.

      A purchase price option has been established at specific dates over the
ten year period covered by the lease arrangement. Using current estimates, the
purchase price would approximate $52 million at the end of the first year and
decreases on an amortizing basis to approximately $37 million at the end of the
tenth year.


                                                                              54
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


      The cancellation option provisions of the lease arrangement stipulate a
residual value guarantee by Covance at specific dates over the ten year period.
Sale of the facility is stipulated in the lease arrangement at such time that
the lessee exercises the cancellation option provisions. The lessee's residual
value guarantee ("Deficiency Payment") is unconditionally payable to the lessor
in the event that the lessee terminates the lease arrangement and the sale of
the facility results in receipt of sales proceeds by the lessor in an amount
less than the lessor's unamortized investment in the lease arrangement. The
lessee's maximum Deficiency Payment would approximate $35 million at the end of
the first year and decreases to approximately $25 million at the end of the
tenth year, assuming that the sales proceeds received by the lessor were zero.


11.  Geographic Information

                                         United                   Europe &
                                         States                     Other
                                         ------                    -------
Net revenue:
      1996.......................         $348,996                  $145,832
      1995.......................         $286,474                  $122,700
      1994.......................         $242,131                  $ 77,370

Income from operations:
      1996.......................         $ 29,244(1)               $  8,617(1)
      1995.......................         $ 34,799(2)               $ 12,762
      1994.......................         $ 32,710                  $  5,889

Identifiable assets:
      1996.......................         $297,386                  $153,661
      1995.......................         $229,720                  $ 92,790
      1994.......................         $202,986                  $ 69,006


      (1)   Excluding the impact of the 1996 one-time spin-off related charge
            totaling $27,404, United States and European & Other income from
            operations were $48,848 and $16,417, respectively.

      (2)   Excluding the impact of the 1995 restructuring provision totaling
            $4,616, United States income from operations was $39,415.


                                                                              55
<PAGE>


                          COVANCE INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)
               (Dollars in thousands, unless otherwise indicated)


12.  Related Party Transactions

      Historically, Covance had participated in Corning's centralized treasury
and cash management processes. For domestic operations, cash received from
operations was generally transferred to Corning on a daily basis. For
international operations, excess cash was periodically transferred to Corning.
Cash disbursements for operations, acquisitions and other investments was funded
as needed from Corning. Substantially all of Covance's borrowings during 1996
(prior to the establishment of the Credit Facility), 1995 and 1994 were from
Corning. The blended rate on those borrowings for 1996, 1995 and 1994 was
approximately 6.0%.

      During 1996, 1995 and 1994, certain members of Covance management
participated in various stock compensation programs sponsored by Corning
resulting in Covance recognizing compensation expense of $1.5 million, $0.4
million and $0.1 million, respectively.

      During 1996, 1995 and 1994 Corning and affiliates provided a number of
administrative functions to Covance which resulted in charges of $3.4 million,
$5.3 million and $5.7 million being recorded in Covance's results of operations
for 1996, 1995 and 1994, respectively. Management believes the method used to
allocate such costs is reasonable under the circumstances. The charges for these
functions are included primarily in selling, general and administrative expenses
and do not necessarily reflect the amount of expenses that would have been
incurred by Covance on a stand-alone basis. In certain cases, related party
expenses allocated to Covance have not required reimbursement in cash and,
accordingly, have been treated as capital contributions.


13.  Quarterly Financial Information (Unaudited)

      The following is a summary of unaudited quarterly financial information
for 1996 and 1995:

<TABLE>
<CAPTION>
                                                          First            Second             Third            Fourth
Year Ended December 31, 1996                             Quarter           Quarter           Quarter           Quarter
- ----------------------------                             -------           -------           -------           -------
<S>                                                      <C>               <C>               <C>               <C>     
Net revenues.......................................      $108,697          $121,530          $127,179          $137,422
Income (loss) from operations......................        14,038            17,335            17,502           (11,014)(1)
Net income.........................................         7,307             8,830             9,074           (12,495)(1)
</TABLE>

<TABLE>
<CAPTION>
                                                          First            Second             Third            Fourth
Year Ended December 31, 1995                             Quarter           Quarter           Quarter           Quarter
- ----------------------------                             -------           -------           -------           -------
<S>                                                      <C>               <C>               <C>               <C>     
Net revenues.......................................      $ 91,974          $104,813          $106,099          $106,288
Income from operations.............................        12,983             9,665(2)         13,671            11,242
Net income.........................................         6,547             4,449(2)          7,516             5,714
</TABLE>


 (1)        Excluding the impact of the 1996 one-time spin-off related charge
            totaling $27,404 ($19,725 net of tax), income from operations and
            net income in the fourth quarter of 1996 were $16,390 and $7,230,
            respectively.

 (2)        Excluding the impact of the 1995 restructuring provision totaling
            $4,616 ($2,770 net of tax), income from operations and net income in
            the second quarter of 1995 were $14,281 and $7,219, respectively.


                                                                              56


<PAGE>


Item 9.  Changes in and Disagreements with Accountants on Accounting and
              Financial Disclosure

      None.

















                                                                              57
<PAGE>


                                    PART III


Item 10.  Directors and Executive Officers of the Registrant

Management

      Directors. The Covance Board of Directors ("Covance Board") is comprised
of seven Directors and is divided into three classes, each class is elected for
a three-year term at the annual meeting of stockholders. Set forth below is the
names and ages of each Director, and their class and term of office. Messrs.
Campbell, Kuebler and Ughetta are continuing Directors of the Company. In
connection with the Distribution, Messrs. Baylis, Lerner, MacDonald, and Morris
were elected to the Covance Board on December 31, 1996. The Company does not
intend to hold an annual meeting of stockholders until Spring 1998.

Name                               Age            Class        Term Expires
- ----------------------------       ---            -----        ------------
Robert M. Baylis                    58              I             1998
Van C. Campbell                     58             III            2000
Christopher A. Kuebler              43             III            2000
Irwin Lerner                        66              I             1998
J. Randall MacDonald                48              II            1999
Nigel W. Morris                     38             III            2000
William C. Ughetta                  63              II            1999

      Robert M. Baylis was a Vice Chairman of CS First Boston Corporation
("First Boston"), a financial services company, from March 1992 to March 1994,
and from August 1995 to January 1996. He was Chairman and Chief Executive
Officer of CS First Boston Pacific Inc./Hong Kong from March 1994 to August
1995. Prior to March 1992, Mr. Baylis held a variety of positions with First
Boston, including Managing Director-Investment Banking Group and Managing
Director-Equity Security Department. Prior to his retirement, Mr. Baylis was
with First Boston for over 33 years. He is also a director of Host Marriott
Corporation (hotels), Gryphon Holdings, Inc. (insurance), Home State Holdings,
Inc. (insurance) and New York Life Insurance Company (insurance). Mr. Baylis has
been a member of the Covance Board since December 1996.

      Van C. Campbell is the Vice Chairman of Corning, an affiliate of the
Company prior to the Distribution Date, which he joined in 1964. He was elected
assistant treasurer in 1971, treasurer in 1972, a vice president in 1973,
financial vice president in 1975 and senior vice president for finance in 1980.
He became general manager of the Consumer Products Division in 1981. Mr.
Campbell was elected Vice Chairman and a director of Corning in 1983. He is a
director of Armstrong World Industries, Inc. (flooring and building products),
General Signal Corporation (industrial products) and Quest Diagnostics, Inc.
(clinical testing), an affiliate of the Company prior to the Distribution Date.
Mr. Campbell has been a member of the Covance Board since May 1995.


                                                                              58

<PAGE>

      Christopher A. Kuebler has been Covance's President and Chief Executive
Officer since November 1994. From March 1993 through November 1994, he was the
Corporate Vice President, European Operations for Abbott Laboratories Inc.
("ALI"), a diversified health care company. From January 1991 until March 1993,
Mr. Kuebler was the Vice President, Sales and Marketing for ALI's Pharmaceutical
Division. Mr. Kuebler has been a member of the Covance Board since November
1994, and was elected Chairman in November 1996. Mr. Kuebler also serves in
various executive officer and director capacities of Covance's subsidiaries.

      Irwin Lerner was the Chairman of the Board of Directors and Executive
Committee of Hoffmann-La Roche, Inc. ("Roche"), a pharmaceutical company, from
January to September 1993. From April 1980 to January 1993, Mr. Lerner was the
President and Chief Executive Officer of Roche. He is also a director of Humana,
Inc. (HMO), Medarex, Inc. (biotechnology), Public Service Enterprise Group Inc.
(public utility) and Sequana Therapeutics, Inc. (genomics). Mr. Lerner has been
a member of the Covance Board since December 1996.

      J. Randall MacDonald has been the Senior Vice President-Human Resources
and Administration for the GTE Corporation, a telecommunications company, since
April 1995. Prior to April 1995, Mr. MacDonald held various senior positions
with GTE, including Vice President-Employee Relations and Organizational
Development (from 1988) and Vice President of Organizational Development (from
1986). Mr. MacDonald joined GTE in 1983 as a Director of Employee Relations. Mr.
MacDonald has been a member of the Covance Board since December 1996.

      Nigel W. Morris has been the President and Chief Operating Officer of
Capital One Financial Corporation ("Capital One"), a financial services company,
since July 1994. Mr. Morris was an Executive Vice President of the Signet
Banking Corporation ("Signet Bank") credit card division from May 1993 to
November 1994. From October 1988 until April 1993, Mr. Morris was the Senior
Vice President-Policy/Strategy-Credit Card Business for Signet Bank. He is also
a director of Capital One and a member of Visa U.S.A. Inc.'s Marketing
Committee. Mr. Morris has been a member of the Covance Board since December
1996.

      William C. Ughetta is the Senior Vice President and General Counsel of
Corning, an affiliate of the Company prior to the Distribution Date. Mr. Ughetta
joined Corning in 1968 as assistant secretary and assistant counsel. He was
elected secretary of the corporation in 1971 and vice president in 1972. He was
elected a senior vice president in 1983. Mr. Ughetta has been a member of the
Covance Board since July 1996. He is a director of Siecor Corporation (fiber
optics) and Chemung Canal Trust Company (banking).


                                                                              59
<PAGE>


      Directors' Compensation. Each director of Covance, other than a director
who is an employee of Covance, receives $15,000 annually for services as a
director and is also paid $1,000 for each meeting of the Covance Board and $500
for each meeting of any committee thereof which he attends.

      Pursuant to a Directors Deferred Compensation Plan ("DDCP"), adopted
December 1996, each director may elect to defer until a date specified by him
receipt of all or a portion of his cash compensation. Such plan provides that
amounts deferred may be allocated to (i) a cash account upon which amounts
deferred may earn interest, compounded quarterly, at the base rate of Citibank,
N.A. in effect on certain specified dates, (ii) a market value account, the
value of which will be based upon the market value of Covance Common Stock from
time to time, or (iii) a combination of such accounts. All six non-employee
directors are eligible to participate in the DDCP.

      Non-Employee Directors also participate in a Director's Restricted Stock
Plan ("DRSP"), adopted December 1996, pursuant to which Covance issues to each
non-employee director elected 200 shares of Covance Common Stock for each year
of their term of service, subject to forfeiture and restrictions on transfer,
and 2,000 shares upon such director's election, subject to forfeiture and
restrictions on transfer.

      Committees of the Board of Directors. Covance has established three Board
committees: the Audit and Finance Committee, the Corporate Governance Committee,
and the Compensation Committee (collectively, the "Committees"). The Committees
were established in December 1996. No meetings of any of these Committees took
place in 1996. The Audit and Finance Committee examines and considers matters
relating to the financial affairs of Covance, including reviewing Covance's
annual financial statements, the scope of the independent and internal audits
and the independent auditor's letter to management concerning the effectiveness
of Covance's internal financial and accounting controls. The Audit and Finance
Committee's members are Mr. Baylis (Chairman), Mr. Campbell and Mr. Ughetta. The
Corporate Governance Committee examines, considers and makes recommendations
concerning various policies relating to the management of the Company, including
policies concerning the evaluation and remuneration of Directors, and
performance requirements for Directors. The Corporate Governance Committee's
members are Mr. Morris (Chairman), Mr. Kuebler, Mr. MacDonald and Mr. Ughetta.
The Compensation Committee makes recommendations to the Covance Board with
respect to programs for human resource development and management organization
and succession, determine senior executive compensation, consider and make
recommendations to the Covance Board with respect to compensation matters and
policies and employee benefit and incentive plans, administer such plans, and
administer Covance's stock option and equity based plans and grant stock options
and other rights under such plans. The Compensation Committee's members are Mr.
MacDonald (Chairman), Mr. Morris and Mr. Lerner.


                                                                              60
<PAGE>


      Executive Officers. In addition to Mr. Kuebler, the following persons
serve as executive officers of Covance:

      Richard J. Andrews (49) has been a Corporate Senior Vice President of
Covance since July 1996. In addition, Mr. Andrews has served as the President of
Covance Central Laboratory Services Inc. ("Central Labs"), a wholly owned
subsidiary of Covance, since June 1994. From January 1993, Mr. Andrews has
served as the President of Covance Central Laboratory Services S.A. ("Central
Labs S.A."), a wholly owned subsidiary of Central Labs. Central Labs and Central
Labs S.A. provide the Company's central laboratory services. Prior to January
1993, Mr. Andrews served in various executive capacities in Europe, including
Worldwide Business Director, for Dupont International S.A., a multinational
chemical and pharmaceutical company. Mr. Andrews also serves as a director of
several of Covance's subsidiaries.

      Michael Giannetto (34) has been the Company's Controller since July 1996
and a Vice President since November 1996. From December 1992 to March 1995, Mr.
Giannetto was the Manager of Financial Reporting and Technical Accounting for
Corning Life Sciences Inc. ("CLSI"), an affiliate of the Company prior to the
Distribution Date. From March 1995 to July 1996, Mr. Giannetto was the Business
Controller for Covance. Prior to December 1992, Mr. Giannetto was a Senior Audit
Manager for Deloitte & Touche.

      Charles C. Harwood, Jr. (43) has been the Company's Corporate Senior Vice
President and Chief Financial Officer since July 1996. From November 1994 to
July 1996, Mr. Harwood was the Company's Vice President and Chief Financial
Officer. From May 1993 to November 1994, Mr. Harwood was Executive Director,
Finance of Covance. From January 1993 to May 1993, Mr. Harwood was Chief
Financial Officer and Vice President of Finance with Integrated Telecom
Technologies, Inc. Prior to that position, he was the President of Pembroke
Development Co., Inc., a commercial real estate development company. Mr. Harwood
also serves as a director of Bio-Imaging, Covance Biotechnology and several of
Covance's subsidiaries.

      Jeffrey S. Hurwitz (36) has been the Company's Corporate Senior Vice
President, General Counsel and Secretary since July 1996. From November 1994 to
July 1996, Mr. Hurwitz was Covance's Vice President, General Counsel and
Secretary. From October 1993 to November 1994, Mr. Hurwitz was Covance's General
Counsel and Secretary. From May 1992 to October 1993, Mr. Hurwitz was an
Assistant Counsel and Assistant Secretary for CLSI, an affiliate of the Company
prior to the Distribution Date. From August 1991 to May 1992, Mr. Hurwitz was an
Assistant Counsel for Corning, an affiliate of the Company prior to the
Distribution Date. From February 1991 to June 1991, Mr. Hurwitz was an Associate
with the law firm of Luskin & Stern. Prior to February 1991, Mr. Hurwitz was an
Associate with the law firm of Shearman & Sterling. Mr. Hurwitz also serves as a
director of Bio-Imaging, Covance Biotechnology and several of Covance's
subsidiaries.


                                                                              61

<PAGE>

      Kim D. Lamon, M.D., Ph.D. (44) has been a Corporate Senior Vice President
of Covance since July 1996. In addition, Dr. Lamon has been the President of
Covance Clinical and Periapproval Services Inc. ("CAPS") and Covance
Periapproval Services Inc. ("CPSI") since May 1996. CAPS and CPSI, and their
European affiliates, provide the Company's clinical and periapproval services.
From April 1994 until May 1996, he was the Executive Vice President, Chief
Medical Officer for Quest Diagnostics Incorporated, and Senior Vice President,
Science and Technology for CLSI, in each case an affiliate of the Company prior
to the Distribution Date. From July 1992 until April 1994, Dr. Lamon was Senior
Vice President, Clinical Research and Development and Executive Medical Director
for Rhone-Poulenc Rorer ("RPR"), a pharmaceutical company. Prior to July 1992,
Dr. Lamon was Senior Vice President, Clinical Research and Regulatory Affairs at
RPR. Dr. Lamon received his M.D. and Ph.D. in Pharmacology from Thomas Jefferson
University. Since 1989, Dr. Lamon has been an Adjunct Assistant Professor of
Pharmacology at Thomas Jefferson University. Dr. Lamon also serves as a director
of several of Covance's subsidiaries.

      James D. Utterback (41) has been the Company's Corporate Senior Vice
President and Group President, Global Ventures, since August 1995. Global
Ventures is responsible for the Company's international expansion plans. Mr.
Utterback has also been responsible for Covance's global clinical packaging
operations since August 1995. From May 1994 until August 1995, Mr. Utterback was
the Senior Vice President, Human Resources and Quality for CLSI, an affiliate of
the Company prior to the Distribution Date. Prior to May 1994, Mr. Utterback
served in various executive capacities, including Chief Executive Officer in
South Africa, for RPR, a pharmaceutical company. Mr. Utterback has worked in the
pharmaceutical industry since 1985, living in Europe, Africa and the United
States. Mr. Utterback also serves as a director of several of Covance's
subsidiaries.

      Michael G. Wokasch (45) has been a Corporate Senior Vice President of
Covance since July 1996. In addition, Mr. Wokasch has been the President of
Covance Laboratories Inc. ("Labs"), a wholly owned subsidiary of Covance, since
July 1995. Labs and its affiliates provide the Company's preclinical services.
From January 1992 until July 1995, Mr. Wokasch served as Divisional Vice
President of Sales of ALI. From October 1991 to January 1992, Mr. Wokasch served
as Director for New Product/Marketing/Development & Scientific Relations at ALI.
Prior to October 1991, Mr. Wokasch was a Director, New Product Development at
ALI. Mr. Wokasch also serves as a director of several of Covance's subsidiaries.


                                                                              62
<PAGE>


Item 11.  Executive Compensation

      Compensation. The following table sets forth information with respect to
annual and long-term compensation paid by Covance and its subsidiaries, or its
affiliates (prior to the Distribution Date) as noted in the footnotes, to each
of the chief executive officer and the four other most highly compensated
executive officers (collectively, the "named executive officers") of Covance
during the years ended December 31, 1996, 1995 and 1994 for services rendered by
each of the named executive officers. Unless otherwise noted, all references in
the following tables and footnotes to stock and stock options relate to awards
of, and options to purchase, Corning Common Stock. Effective on the Distribution
Date, all such Corning awards were terminated or otherwise forfeited. See
Footnote 2 to this table. The Corning awards are being presented for historical
purposes only.


                                                      SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                      Long-Term Compensation
                                               Annual Compensation (1)                   Awards (1) (2)
                                   ____________________________________________     ____________________________

                                                                                    Restricted      Securities      All Other
        Name and                                                   Other Annual       Stock         Underlying    Compensation
   Principal Position     Year     Salary            Bonus         Compensation       Awards (3)      Options (4)      (1) (5)
____________________________________________________________________________________________________________________________________
<S>                      <C>      <C>              <C>                <C>             <C>               <C>              <C>
Christopher A. Kuebler,  1996     345,833          231,000            72,447 (14)     (18)              -0-              72,043
Chairman, President and  1995     322,567          303,958            50,427          (19)              (26)             68,680
Chief Executive Officer  1994      51,667 (8)      101,679             -0-            -0-               (26)              2,140
____________________________________________________________________________________________________________________________________
Richard J. Andrews,      1996     231,444          106,696             -0-            -0-               (27)             58,788
Corporate Senior Vice    1995     222,833          176,512             -0-            -0-               -0-              57,478
President; President,    1994     197,635           41,000             -0-            -0-               (27)             50,499
Covance Central
Laboratory Services Inc.
____________________________________________________________________________________________________________________________________
Kim D. Lamon (6),        1996     206,111 (9)      156,957 (12)       40,745 (15)     (20)              -0-              55,786
Corporate Senior Vice    1995       (9)              (12)             34,097          (21)              (28)             58,060
President; President,    1994       (9)              (12)              -0-            -0-               (28)             18,534
Covance Clinical and
Periapproval Services
Inc. and Covance
Periapproval Services
Inc.
____________________________________________________________________________________________________________________________________
James D. Utterback (7),  1996     244,565          162,200            34,254 (16)     (22)              -0-              45,376
Corporate Senior         1995      98,820 (10)      78,738 (13)       26,831          (23)              (29)             41,595
Vice President; Group    1994       (10)             (13)              -0-            -0-               (29)             17,509
President, Global
Ventures
____________________________________________________________________________________________________________________________________
Michael G. Wokasch,      1996     202,614          103,334             -0-   (17)     (24)              -0-              17,730
Corporate Senior         1995     100,000 (11)      76,500             -0-            (25)              (30)              4,740
Vice President;
President, Covance
Laboratories, Inc.
____________________________________________________________________________________________________________________________________
</TABLE>



                                                                              63

<PAGE>

       (1)   As noted in the footnotes set forth below, compensation disclosed
             in this table, including the footnotes thereto, may reflect
             compensation paid by the Company, Corning, Quest or CLSI, for
             services rendered by the named executive to entities other than the
             Company.

       (2)   All awards reflected in these columns, including the footnotes
             thereto, reflect awards to the named executives by Corning for
             Corning securities. Except to the extent noted in the footnotes
             below, all such awards were terminated or forfeited on the
             Distribution Date. For the purpose of the discussion set forth in
             the footnotes below, (i) a "terminated" Corning stock or option
             award refers to Corning awards which ended as at the Distribution
             Date but were eligible for regrant by the Company pursuant the
             Conversion Plan (as hereinafter defined) and (ii) a "forfeited"
             Corning stock or option award refers to Corning awards which ended
             as at the Distribution Date and were not eligible for regrant under
             any Company plan.

       (3)   No Covance restricted stock awards were granted in 1996. All
             restricted stock awards granted in 1996, 1995 and 1994 were for
             shares of Corning common stock granted pursuant to Corning benefit
             plans. Except as noted below, all such Corning restricted stock
             awards terminated as at the Distribution Date and were replaced by
             Company restricted stock awards pursuant to the Conversion Plan as
             follows: (i) for Mr. Kuebler, an aggregate of 31,805 Corning
             restricted shares were terminated and 15,000 shares were forfeited,
             all at the Distribution Date, and an aggregate of 62,579 Covance
             shares were granted in January 1997 pursuant to the Conversion
             Plan; (ii) for Dr. Lamon, an aggregate of 14,841 Corning restricted
             shares were terminated, 11,250 shares were forfeited and 3,750
             shares were released from restriction, all at the Distribution
             Date, and an aggregate of 29,201 Covance shares were granted in
             January 1997 pursuant to the Conversion Plan; (iii) for Mr.
             Utterback, an aggregate of 7,076 Corning restricted shares were
             terminated, 7,500 shares were forfeited and 2,500 shares were
             released from restriction, all at the Distribution Date, and an
             aggregate of 13,923 Covance shares were granted in January 1997
             pursuant to the Conversion Plan; and (iv) for Mr. Wokasch, an
             aggregate of 5,950 Corning restricted shares were terminated, 2,250
             shares were forfeited and 750 shares were released from
             restriction, all at the Distribution Date, and an aggregate of
             11,707 Covance shares were granted in January 1997 pursuant to the
             Conversion Plan. Conversion Plan restricted shares, in substitution
             of all terminated Corning restricted shares, were granted to the
             named executives on January 31, 1997, which shares are subject to
             forfeiture conditions and restrictions on transfer until July 1,
             1997.

       (4)   No Covance options were granted in 1996. All options granted in
             1996, 1995 and 1994 were options for shares of Corning common stock
             granted pursuant to Corning benefit plans. All such Corning options
             terminated as at the Distribution Date and were replaced by Company
             options pursuant to the Conversion Plan, as noted below. Conversion
             Plan options, in substitution of the Corning options, were granted
             to the named executives on January 31, 1997.

       (5)   Includes the following amounts contributed by Covance, except as
             noted, as matching contributions to such individuals 401(k) Plan
             (as defined below) account for 1996: $6,531 for Mr. Kuebler, $6,517
             for Mr. Andrews, $5,774 for Dr. Lamon, $8,250 for Mr. Utterback and
             $8,250 for Mr. Wokasch. In addition, pursuant to a non-qualified
             benefit plan of which Mr. Andrews is the sole beneficiary, Mr.
             Andrews received a 1996 Company contribution of $43,951 to his
             account in such plan. Also includes a $12,840 automobile allowance
             received by each of Messrs. Kuebler, Utterback and Dr. Lamon,
             $8,320 received by Mr. Andrews and $9,480 received by Mr. Wokasch.
             Also includes (i) the forgiveness of 20% of principal on
             interest-free loans made by Covance to the following individuals,
             for the following amounts forgiven: $40,000 for Mr. Kuebler,
             $30,000 for Dr. Lamon, and $20,000 for Mr. Utterback, and (ii)
             imputed interest on such loans to the following individuals for the
             following amounts: $12,672 for Mr. Kuebler, $7,172 for Dr. Lamon
             and $4,286 for Mr. Utterback. The original principal amount of such
             loans were $200,000 for Mr. Kuebler, $150,000 for Dr. Lamon and
             $100,000 for Mr. Utterback, which loans are to be forgiven over a
             five year period provided 


                                                                              64

<PAGE>

             such individuals continue to be employed by Covance. Such loans 
             were made to assist these individuals in relocating to the New 
             Jersey area.

       (6)   Dr. Lamon joined the Company in May 1996. All compensation and
             benefits reflected in this table for fiscal 1994 and 1995, and
             January through May 1996, reflect compensation received from CLSI
             or Quest, affiliates of the Company prior to the Distribution Date,
             for services performed for such company. All stock and option
             awards during such dates were issued by Corning for CLSI or Quest
             performance by Dr. Lamon.

       (7)   Mr. Utterback joined the Company in August 1995. All compensation
             and benefits reflected in this table for fiscal 1994, and January
             through August 1995, reflect compensation received from CLSI or
             Quest, affiliates of the Company prior to the Distribution Date,
             for services performed for such company. All stock and option
             awards during such dates were issued by Corning for CLSI or Quest
             performance by Mr. Utterback.

       (8)   Mr. Kuebler joined the Company in November 1994.

       (9)   For the period January through April 1996, Dr. Lamon also received
             salary from CLSI (an affiliate of the Company prior to the
             Distribution Date), for work performed for CLSI or Quest, in the
             amount of $115,813. In fiscal 1995 and 1994, Dr. Lamon received
             salary from CLSI, for work performed for CLSI or Quest, in the
             amounts of $309,417 and $200,000, respectively.

       (10)  For the period January through July 1995, Mr. Utterback also
             received salary from CLSI (an affiliate of the Company prior to the
             Distribution Date), for work performed for CLSI or Quest, in the
             amount of $138,347. In fiscal 1994, Mr. Utterback received salary
             from CLSI, for work performed for CLSI or Quest, in the amount of
             $153,333.

       (11)  Mr. Wokasch joined the Company in July 1995.

       (12)  For the period January through April 1996, Dr. Lamon received a
             bonus from CLSI (an affiliate of the Company prior to the
             Distribution Date), for work performed for CLSI or Quest, in the
             amount of $37,102. In fiscal 1995 and 1994, Dr. Lamon received
             bonuses from CLSI, for work performed for CLSI or Quest, in the
             amounts of $160,265 and $175,625, respectively.

       (13)  For the period January through July 1995, Mr. Utterback also
             received a bonus from CLSI (an affiliate of the Company prior to
             the Distribution Date), for work performed for CLSI or Quest, in
             the amount of $26,088. In fiscal 1994, Mr. Utterback received a
             bonus from CLSI, for work performed for CLSI or Quest, in the
             amount of $134,646.

       (14)  The amount shown for Mr. Kuebler reflects (i) dividends on shares
             of Corning restricted stock granted but not earned within one year
             from the date of grant, (ii) tax and financial counseling services,
             (iii) transportation services and (iv) tax reimbursement allowances
             in the aggregate amount of $42,727, which are intended to offset
             the inclusion in taxable income of the value of certain benefits.

       (15)  The amount shown for Dr. Lamon reflects (i) dividends on shares of
             Corning restricted stock granted but not earned within one year
             from the date of grant, (ii) tax and financial counseling services,
             (iii) transportation services and (iv) tax reimbursement allowances
             in the aggregate amount of $27,545, which are intended to offset
             the inclusion in taxable income of the value of certain benefits.


                                                                              65
<PAGE>


       (16)  The amount shown for Mr. Utterback reflects (i) dividends on shares
             of Corning restricted stock granted but not earned within one year
             from the date of grant, (ii) tax and financial counseling services,
             (iii) transportation services and (iv) tax reimbursement allowances
             in the aggregate amount of $21,364, which are intended to offset
             the inclusion in taxable income of the value of certain benefits.

       (17)  The value of benefits received by the named individual did not
             exceed the lesser of either $50,000 or 10% of the total annual
             salary and bonus reported.

       (18)  Pursuant to Corning's Corporate Performance Plan/CPP-6, Mr. Kuebler
             was granted 13,500 Corning restricted performance shares in
             December 1995. Mr. Kuebler, pursuant to the terms of such plan,
             earned an aggregate of 16,065 Corning restricted shares in fiscal
             1996, valued at $743,006 as of December 31,1996. As a result of the
             Distribution, Mr. Kuebler's rights to such CPP-6 shares were
             terminated. See Footnote 3 with respect to shares granted to Mr.
             Kuebler pursuant to the Conversion Plan in January 1997 as a
             replacement for all terminated Corning shares. Forfeited shares
             were not replaced.

       (19)  Pursuant to Corning's Corporate Performance Plan/CPP-5, Mr. Kuebler
             was granted 10,000 Corning restricted performance shares in
             December 1994. Mr. Kuebler, pursuant to the terms of such plan,
             earned an aggregate of 10,740 Corning restricted shares in fiscal
             1995, valued at $326,926 as of December 31, 1995. As a result of
             the Distribution, Mr. Kuebler's rights to such CPP-5 shares were
             terminated. Furthermore, pursuant to a Corning benefit plan, Mr.
             Kuebler was also granted 20,000 restricted shares ("Career Shares")
             valued at $608,800 as of December 31, 1995. Such Career Shares were
             subject to certain restrictions on transfer until retirement, and
             certain forfeiture provisions. With respect to such Career Shares,
             5,000 shares were terminated and 15,000 shares were forfeited as at
             the Distribution Date. See Footnote 3 with respect to shares
             granted to Mr. Kuebler pursuant to the Conversion Plan in January
             1997 as a replacement for all terminated Corning shares. Forfeited
             shares were not replaced.

       (20)  Pursuant to Corning's Corporate Performance Plan/CPP-6, Dr. Lamon
             was granted 10,000 Corning restricted performance shares in
             December 1995. Dr. Lamon, pursuant to the terms of such plan,
             earned an aggregate of 11,900 Corning restricted shares in fiscal
             1996, valued at $550,375 as of December 31, 1996. As a result of
             the Distribution, Dr. Lamon's rights to such CPP-6 shares were
             terminated. See Footnote 3 with respect to shares granted to Dr.
             Lamon pursuant to the Conversion Plan in January 1997 as a
             replacement for all terminated Corning shares. Forfeited shares
             were not replaced.

       (21)  Pursuant to Corning's Corporate Performance Plan/CPP-5, Dr. Lamon
             was granted 6,500 Corning restricted performance shares in December
             1994. Dr. Lamon, pursuant to the terms of such plan, earned an
             aggregate of 2,941 Corning restricted shares in fiscal 1995, valued
             at $89,524 as of December 31, 1995. As a result of the
             Distribution, Dr. Lamon's rights to such CPP-5 shares were
             terminated. Furthermore, pursuant to a Corning benefit plan, Dr.
             Lamon was also granted 15,000 Career Shares, valued at $456,600 as
             of December 31, 1995. Such Career Shares were subject to certain
             restrictions on transfer until retirement, and certain forfeiture
             provisions. With respect to such Career Shares, 11,250 shares were
             forfeited and 3,750 shares were released from all restriction and
             delivered to Dr. Lamon prior to the Distribution Date. See Footnote
             3 with respect to shares granted to Dr. Lamon pursuant to the
             Conversion Plan in January 1997 as a replacement for all terminated
             Corning shares. Forfeited shares were not replaced.


                                                                              66
<PAGE>


       (22)  Pursuant to Corning's Corporate Performance Plan/CPP-6, Mr.
             Utterback was granted 4,000 Corning restricted performance shares
             in December 1995. Mr. Utterback, pursuant to the terms of such
             plan, earned an aggregate of 4,760 Corning restricted shares in
             fiscal 1996, valued at $220,150 as of December 31, 1996. As a
             result of the Distribution, Mr. Utterback's rights to such CPP-6
             shares were terminated. See Footnote 3 with respect to shares
             granted to Mr. Utterback pursuant to the Conversion Plan in January
             1997 as a replacement for all terminated Corning shares. Forfeited
             shares were not replaced.

       (23)  Pursuant to Corning's Corporate Performance Plan/CPP-5, Mr.
             Utterback was granted 4,000 Corning restricted performance shares
             in December 1994. Mr. Utterback, pursuant to the terms of such
             plan, earned an aggregate of 2,316 Corning restricted shares in
             fiscal 1995, valued at $70,499 as of December 31, 1995. As a result
             of the Distribution, Mr. Utterback's rights to such CPP-5 shares
             were terminated. Furthermore, pursuant to a Corning benefit plan,
             Mr. Utterback was also granted 10,000 Career Shares, valued at
             $304,400 as of December 31, 1995. Such Career Shares were subject
             to certain restrictions on transfer until retirement, and certain
             forfeiture provisions. With respect to such Career Shares, 7,500
             shares were forfeited and 2,500 shares were released from all
             restriction and delivered to Mr. Utterback prior to the
             Distribution Date. See Footnote 3 with respect to shares granted to
             Mr. Utterback pursuant to the Conversion Plan in January 1997 as a
             replacement for all terminated Corning shares. Forfeited shares
             were not replaced.

       (24)  Pursuant to Corning's Corporate Performance Plan/CPP-6, Mr. Wokasch
             was granted 5,000 Corning restricted performance shares in December
             1995. Mr. Wokasch, pursuant to the terms of such plan, earned an
             aggregate of 5,950 Corning restricted shares in fiscal 1996, valued
             at $275,188 as of December 31, 1996. As a result of the
             Distribution, Mr. Wokasch's rights to such CPP-6 shares were
             terminated. See Footnote 3 with respect to shares granted to Mr.
             Wokasch pursuant to the Conversion Plan in January 1997 as a
             replacement for all terminated Corning shares. Forfeited shares
             were not replaced.

       (25)  Pursuant to a Corning benefit plan, Mr. Wokasch was granted 3,000
             Career Shares, valued at $91,320 as of December 31, 1995. Such
             Career Shares were subject to certain restrictions on transfer
             until retirement, and certain forfeiture provisions. With respect
             to such Career Shares, 2,250 shares were forfeited and 750 shares
             were released from all restriction and delivered to Mr. Wokasch
             prior to the Distribution Date. See Footnote 3 with respect to
             shares granted to Mr. Wokasch pursuant to the Conversion Plan in
             January 1997 as a replacement for all terminated Corning shares.
             Forfeited shares were not replaced.

       (26)  Pursuant to various Corning stock options plans, Mr. Kuebler was
             granted (i) in 1995, an option to purchase 81,000 shares of Corning
             common stock and (ii) in 1994, an option to purchase 20,000 shares
             of Corning common stock. As at the Distribution Date, all such
             options terminated and were replaced in January 1997 with options
             to purchase an aggregate of 145,611 Covance shares pursuant to the
             Conversion Plan.

       (27)  Pursuant to various Corning stock options plans, Mr. Andrews was
             granted (i) in 1996, an option to purchase 4,000 shares of Corning
             common stock and (ii) in 1994, an option to purchase 12,000 shares
             of Corning common stock. As at the Distribution Date, all such
             options terminated and were replaced in January 1997 with options
             to purchase an aggregate of 31,487 Covance shares pursuant to the
             Conversion Plan.


                                                                              67
<PAGE>


       (28)  Pursuant to various Corning stock options plans, Dr. Lamon was
             granted (i) in 1995, an option to purchase 60,000 shares of Corning
             common stock and (ii) in 1994, an option to purchase 23,000 shares
             of Corning common stock. As at the Distribution Date, all such
             options terminated and were replaced in January 1997 with options
             to purchase an aggregate of 123,967 Covance shares pursuant to the
             Conversion Plan.

       (29)  Pursuant to various Corning stock options plans, Mr. Utterback was
             granted (i) in 1995, an option to purchase 24,000 shares of Corning
             common stock and (ii) in 1994, an option to purchase 18,000 shares
             of Corning common stock. As at the Distribution Date, all such
             options terminated and were replaced in January 1997 with options
             to purchase an aggregate of 66,902 Covance shares pursuant to the
             Conversion Plan.

       (30)  Pursuant to various Corning stock options plans, Mr. Wokasch was
             granted in 1995 an option to purchase 38,000 shares of Corning
             common stock. As at the Distribution Date, all such options
             terminated and were replaced in January 1997 with options to
             purchase an aggregate of 55,095 Covance shares pursuant to the
             Conversion Plan.


                                                                              68

<PAGE>


      Option Grants. The following table sets forth certain information
regarding options granted by Corning in 1996 to all of the named executive
officers pursuant to Corning stock option plans. All such options terminated as
of the Distribution Date. These awards are being presented for historical
purposes only. No Covance options were granted in 1996. Employees of Covance,
including the named executive officers, who held at the Distribution Date
Corning stock options or restricted shares, received new Covance options or
restricted shares under the Conversion Plan (as defined below) in exchange for
the surrender of all such eligible Corning options or restricted shares. Such
grants under the Conversion Plan were approved on January 31, 1997 and are not
reported herein.



                    OPTION/SAR GRANTS IN FISCAL YEAR 1996 (1)

<TABLE>
<CAPTION>
                                                                                                Potential Realizable Value at
                                                                                                Assumed Annual Rates of Stock
                                                                                                   Price Appreciation for
                                                         Individual Grants                             Option Term (3)
                                               ______________________________________    ___________________________________________
                                                % of Total
                                 Number of        Options
                                 Securities     Granted to                               Gain
                                 Underlying      Employees                                at
                                  Options       in Fiscal     Exercise     Expiration     0%
            Name                  Granted         Year         Price          Date        (4)       Gain at 5%      Gain at 10%
______________________________ _______________ ______________ __________ _______________ ________ _______________ _________________
<S>                                 <C>              <C>       <C>          <C>            <C>        <C>             <C>
Christopher A. Kuebler               -0- 
Richard J. Andrews                  4,000 (2)        0.1%      34.44        4/24/06        0          86,637          219,554
Kim D. Lamon                         -0-
James D. Utterback                   -0-
Michael G. Wokasch                   -0-

All Optionees as a
       Group                        4,000          100.0 %      4.44         2006          0          86,637          219,554
______________________________ _______________ ______________ __________ _______________ ________ _______________ _________________
</TABLE>

       (1)   No SARs were granted.

       (2)   The Corning stock option agreement with Mr. Andrews provided that
             one-half of the options would become exercisable on April 24, 1997
             and all of the options would become exercisable on April 24, 1998.
             Such agreement was terminated as of the Distribution Date and Mr.
             Andrews received conversion options under the Conversion Plan on
             January 31, 1997. This award is being presented for historical
             purposes only.

       (3)   The dollar amounts set forth under these columns are the result of
             calculations at 0% and at the 5% and 10% rates established by the
             Commission and therefore are not intended to forecast future
             appreciation of the Company's or Corning's stock price.

       (4)   No gain to the optionees is possible without an appreciation in
             stock price, an event which will also benefit all stockholders. If
             the stock price does not appreciate, the optionees will realize no
             benefit.


                                                                              69

<PAGE>

      Option Exercises and Fiscal Year-End Values. The named executive officers
exercised no Corning options pursuant to Corning plans in 1996. The named
executive officers did not exercise any options pursuant to Company plans in
1996.

      Corporate Performance Plan Activity. Awards of performance-based shares of
Corning Common Stock were granted to Covance's executive officers pursuant to a
series of Corning performance-based plans (the "Corporate Performance Plan").
The Corporate Performance Plan provided the mechanisms to reward improvement in
corporate performance as measured by net income, earnings per share and/or
return on equity. Each year minimum, target and maximum goals were set and
shares awarded (at target levels) which were subject to forfeiture in whole or
in part if performance goals were not met. The percentage of awards that could
have been earned range from 0% to 150% of target. Shares earned remained subject
to forfeiture and restrictions on transfer for two years following the end of
the performance period.

      In December 1996, the Compensation Committee of the Board of Directors of
Corning assessed performance against goals, determined the number of shares
earned of the CPP-6 target shares granted in December 1995. As set forth in the
footnotes to the Summary Compensation Table, Corporate Performance Plan awards
for the CPP-5 and CPP-6 Corning grants were terminated as at the Distribution
Date. Covance granted, in substitution, Covance restricted shares pursuant to
the Covance Conversion Plan, on January 31, 1997.

      Variable Compensation. During fiscal 1996, Company employees participated
in a Corning approved variable compensation plan (the "Plan"), for approximately
400 supervisory, management and executive employees. The performance-based
annual cash incentive awards payable under the Plan were based on financial
goals such as net income, operating margin, return on equity, or earnings per
share, or a combination thereof, and quantifiable non-financial goals. Each
participant was assigned a target award, as a percentage of base salary in
effect at the end of the performance year for which the target is set, payable
if the target is achieved. Actual results were compared to the scale of targets
with each gradation of desired result corresponding to a percentage which was
multiplied by the employee's assigned target award. If the actual result was
below target, awards are less than target, down to a point below which no awards
are earned. If the desired result was above target, awards were greater than
target, up to a stated maximum award. The maximum award assigned to the chief
executive officer could not exceed 200% of base salary in effect on the date the
Corning Compensation Committee set the target for such performance year. The
committee also retained the right to reduce any award if it believed individual
performance did not warrant the award calculated by reference to the result.
Bonus' earned in 1996 for the named executive officers are disclosed in the
Summary Compensation Table.

      Employee Equity Participation Plan. Covance adopted, in December 1996, the
Employee Equity Participation Program ("EEPP"). The EEPP consists of two plans:
(a) a stock option plan from which the Company may grant incentive or
non-statutory stock 


                                                                              70

<PAGE>

options and (b) an incentive stock plan from which the Company may grant
restricted stock awards. No awards were granted to the named executive officers
pursuant to the EEPP in 1996.

      Conversion Plan. In December 1996, the Company adopted the Conversion
Equity Plan (the "Conversion Plan"). The Conversion Plan has essentially the
same characteristics as the EEPP, but any grants made pursuant to the Conversion
Plan are to replace all eligible Corning options and restricted shares held by
Company employees at the Distribution Date, all of which were terminated or
forfeited at the Distribution Date. No awards were granted to the named
executive officers pursuant to the Conversion Plan in 1996.

      Pension Plans. Covance does not currently have any qualified defined
pension benefit plans. In December 1996, Covance adopted a nonqualified
Supplemental Executive Retirement Plan ("SERP") for the benefit of certain
executive officers of Covance, including the named executive officers. Such plan
is, in whole or in part, an unfunded, unsecured obligation of Covance and
administered by the Compensation Committee.

      Eligible executives may commence receiving full benefits under the plan
upon attaining age 60, so long as they have completed at least twenty years of
service (fifteen years for certain Company executives, including the named
executives) with Covance (including service with Corning) or any subsidiary
thereof. Retirement benefits to be provided under the plan will be based on 40%
of an executive's "Final Average Pay," defined to mean the average of an
executive's base salary plus bonus, taking into account the highest five
consecutive years of the executive's last ten years of employment with Covance
or any subsidiary thereof. Under the terms of the plan, executives may, with the
approval of the Compensation Committee, elect to commence receiving reduced
benefits prior to age 60, provided that they have completed at least five years
of service with Covance or any subsidiary thereof and have attained age 55.
Benefits commencing prior to age 60 will be reduced by 5% of the amount of
benefits earned for each year prior to age 60. For example, at age 55, an
executive with at least twenty years (or fifteen years, if applicable) of
service may be eligible to receive 30% of Final Average Pay so long as the
executive receives approval from the Compensation Committee.

      At retirement, the normal form of payment under the plan will be monthly
payments over the lifetime of the executive (or actuarially reduced joint and
survivor benefits over the joint lives of the executive and a named
beneficiary). Alternatively, the executive may elect under the plan, subject to
the approval of the Compensation Committee, the right to receive an actuarially
determined lump-sum distribution from the plan.

      Maximum annual benefits, based on at least twenty years of service and the
Final Average Pay calculated under the straight life annuity option form of
pension, payable to participants at ages 55 to 60 are illustrated in the table
set forth below. The same benefits would apply for those participants eligible
for full benefits with 15 years of service. The 


                                                                              71

<PAGE>

table below does not reflect any limitations on benefits imposed by the Employee
Retirement Income Security Act of 1974, as amended ("ERISA").


                                                             Pension Plan Table
<TABLE>
<CAPTION>
                                                        Age (with at Least 20 Years of Service)
                      ______________________________________________________________________________________________________________
 Final Average
      Pay                   55                  56                57                58                 59                60
_________________     _______________     _______________    ______________    ______________     ______________    ______________
       <S>                   <C>                 <C>               <C>               <C>                <C>               <C>
       $ 100,000              30,000              32,000            34,000            36,000             38,000            40,000
         200,000              60,000              64,000            68,000            72,000             76,000            80,000
         300,000              90,000              96,000           102,000           108,000            114,000           120,000
         400,000             120,000             128,000           136,000           144,000            152,000           160,000
         500,000             150,000             160,000           170,000           180,000            190,000           200,000
         600,000             180,000             192,000           204,000           216,000            228,000           240,000
         700,000             210,000             224,000           238,000           252,000            266,000           280,000
         800,000             240,000             256,000           272,000           288,000            304,000           320,000
         900,000             270,000             288,000           306,000           324,000            342,000           360,000
       1,000,000             300,000             320,000           340,000           360,000            380,000           400,000
       1,100,000             330,000             352,000           374,000           396,000            418,000           440,000
       1,200,000             360,000             384,000           408,000           432,000            456,000           480,000
____________________________________________________________________________________________________________________________________
</TABLE>


      Retirement Savings Plan. Most of the employees of Covance and its
subsidiaries have been eligible to participate in a tax-qualified, defined
contribution plan known as the Stock Purchase Savings Plan (the "401(k) Plan"),
which provides for investment of employee contributions, including tax-deferred
contributions under Section 401(k) of the Code, and matching contributions made
by their employers, in several investment funds, including Covance Common Stock,
at the employees' discretion. As of the January 1, 1997, Covance Common Stock
was added as an investment fund and all or a portion of the employer matching
contributions will automatically be invested in Covance Common Stock. Corning
Common Stock will no longer be available as an investment fund except with
respect to amounts already so invested under the 401(k) Plan. All of the named
executives are eligible to participate in the 401(k) Plan, and their respective
Company matching contributions are disclosed in the Summary Compensation Table
for the periods covered thereby.

      Employee Stock Ownership Plan. Individuals who were active employees of
Covance and its United States subsidiaries as of the Distribution Date became
participants in the Employee Stock Ownership Plan ("ESOP"). To the extent
permitted under the ESOP, Covance contributed, in the aggregate and as of the
Distribution Date, an amount equal to a portion of each participating employee's
annual compensation. Covance may in its discretion from time to time make
additional contributions to the ESOP for the benefit of participating employees.
The assets of the ESOP will be invested primarily in shares of Covance Common
Stock. Amounts contributed to the ESOP for the benefit of participating
employees will be 100% vested on the earlier of death, disability or the 


                                                                              72

<PAGE>

second anniversary of the effective date of the grant. Contributions to the ESOP
will not currently be taxable income to the participating employees and will not
generally be available to them until termination of employment.

      Restricted Share Plan. In December 1996, Covance adopted the Restricted
Share Plan ("RSP"), intended to provide to Covance's foreign national employees
in its non-United States locations who otherwise are ineligible to participate
in the ESOP and to domestic employees whose participation therein is subject to
limitations imposed by ERISA benefits similar to the ESOP. To the extent
permitted under the RSP, Covance will award to participating employees shares of
Covance Common Stock as of the Distribution Date, the market value of which
shall equal a portion of such employee's annual compensation. Covance may in its
discretion from time to time make additional awards to participating employees.
Shares of Covance Common Stock awarded to participating employees will be 100%
vested on the earlier of death, disability or the second anniversary of the date
of each grant.

      Employee Stock Purchase Plan. In December 1996, Covance adopted the
Employee Stock Purchase Plan (the "ESPP") pursuant to which Covance makes
available for sale to employees shares of its Common Stock at a price equal to
85% of the market value on the first or last day of each calendar quarter,
whichever is lower. The ESPP, administered by the Compensation Committee, is
designed to give eligible employees (generally, employees of Covance and its
United States subsidiaries) the opportunity to purchase shares of Covance Common
Stock through payroll deductions up to 10% of compensation in a series of
quarterly offerings commencing January 1, 1997, and ending no later than
December 31, 2006.

      Employment Agreements; Severance and Change in Control Arrangements. In
November 1996, Mr. Kuebler entered into an employment agreement with Covance.
The agreement expires on or before the third anniversary of the Distribution
Date. The agreement includes provisions for an annual salary of no less than
$450,000, with increases subject to the discretion of the Covance Board; annual
target participation in the Variable Compensation Plan of Covance in amounts no
less than 65% of annual salary in effect at the time performance goals are
established; and severance payments following a termination or a change in
control in accordance with the severance policy described below, except that Mr.
Kuebler will receive three times his base annual salary and three times his
annual award of variable compensation in the event of termination for reasons
other than cause.

      In November 1996, Covance adopted an employment and severance policy
pursuant to which it provided to each executive officer, including the named
executive officers, compensation equal to two times the executive officer's base
annual salary at the annual rate in effect on the date of termination and two
times the annual award of variable compensation at the most recent target level
in the event that such executive officer has been terminated for reasons other
than cause. Such executive officer will also be entitled to participate in
Covance's health and benefits plans (to the extent permitted by the


                                                                              73

<PAGE>

administrative provisions of such plans and applicable federal and state law)
for a period of up to two years or until such officer is covered by a successor
employer's benefit plans, whichever first occurs. Pursuant to such policy,
Covance will also provide to each executive officer upon the termination of
employment by Covance other than for cause during the twelve months following a
change in control of Covance compensation equal to three times base annual
salary in effect on the termination date and three times the annual variable
compensation at the most recent target level and such officer will be entitled
to participate in Covance's health and benefits plans for a period of up to
three years. A "change in control" is defined in the policy to include the
following: the acquisition by a person of 20% or more of the voting stock of
Covance; as a result of a contested election a majority of the Covance Board
members are different than the individuals who served on Covance's Board in the
two years prior to such contested election; or approval by Covance's
stockholders of a merger or consolidation in which Covance is not the survivor
thereof, or a sale or disposition of all or substantially all of Covance's
assets or a plan of partial or complete liquidation.





                                                                              74
<PAGE>


Item 12.  Security Ownership by Certain Beneficial Owners and Management
          of Covance

      The following table sets forth the number of shares of Covance Common
Stock beneficially owned by Directors, by the named executive officers and by
all Directors and executive officers of Covance as a group, as of March 3, 1997.
Except as otherwise noted, the named individual has sole voting and investment
with respect to such power securities.

<TABLE>
<CAPTION>
                                                Number of Shares                Number of Currently              Percent
                Name                         Beneficially Owned (1)             Exercisable Options            Outstanding
_____________________________________     ______________________________      ________________________       ________________
<S>                                                 <C>                                 <C>                         <C>
Richard J. Andrews                                     509  (2)                         19,545                      *
Robert M. Baylis                                     5,200  (3)                            0                        *
Van C. Campbell                                     24,787  (3)                            0                        *
Christopher A. Kuebler                                 340  (2)                         39,345                      *
Kim D. Lamon                                         1,365  (2)                         19,678                      *
Irwin Lerner                                         3,200  (3)                            0                        *
J. Randall MacDonald                                 3,100  (3)                            0                        *
Nigel W. Morris                                      2,200  (3)                            0                        *
William C. Ughetta                                  29,598  (3)                            0                        *
James D. Utterback                                     768  (2)                         19,678                      *
Michael G. Wokasch                                     221  (2)                          7,869                      *

All Directors and Executive                         71,461  (1),(2),(3)                132,187                      *
      Officers as a Group (14)
</TABLE>


____________________________

        * Less than 1%.

       (1)   Does not include 53 shares owned by the spouses and minor children
             of certain executive officers and Directors, as to which such
             officers and Directors disclaim beneficial ownership.

       (2)   Does not include restricted performance shares granted in January
             1997 pursuant to the EEPP. Such shares are subject to performance
             conditions, certain vesting restrictions and forfeiture
             restrictions.

       (3)   Includes 2,000 shares of Covance Common Stock, issued pursuant to
             the DRSP, which each non-employee Director received in connection
             with their election as a director. Such shares are currently
             subject to certain vesting restrictions, restrictions on transfer
             and forfeiture restrictions. Also, includes a minimum of 200 shares
             of Covance Common Stock, issued pursuant to the DRSP, which each
             non-employee Director receives annually in connection with their
             yearly service as a Director. Such shares are currently subject to
             certain restrictions on transfer and forfeiture restrictions.


                                                                              75
<PAGE>


Item 13. Certain Relationships and Related Transactions

      None.



                                                                              76
<PAGE>


                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules, and Reports of Form 8-K

(a)  Documents filed as part of this report.

      1. Financial Statements.

          Report of Price Warehouse LLP - Independent Accountants

          Consolidated Financial Statements
                     Consolidated Balance Sheets - December 31, 1996 and 1995
                     Consolidated Statements of Income - Years ended December
                        31, 1996, 1995 and 1994
                     Consolidated Statements of Cash Flows - Years ended
                        December 31, 1996, 1995 and 1994
                     Consolidated Statements of Stockholders Equity - Years
                        ended December 31, 1996, 1995 and 1994
                     Notes to Consolidated Financial Statements

      2. Index to Financial Statement Schedules. Schedules are omitted because
      they are not applicable or the required information is shown in the
      financial statements or notes thereto.

      3. Exhibits. The exhibits required by Item 601 of Regulation S-K filed as
      part of, or incorporated by reference in, this report are listed in (c)
      below and in the accompanying Exhibit Index.

(b) Reports on Form 8-K.
      None.

(c)  Item 601 Exhibits.

2.1           Transaction Agreement among Corning Incorporated, Corning Life
              Science Inc., Corning Clinical Laboratories Inc. (Delaware),
              Covance Inc. and Corning Clinical Laboratories Inc. (Michigan),
              dated November 22, 1996.

3.1           Certificate of Incorporation.

3.2           By-Laws.

4.1           Form of Common Stock Certificate.

4.2           Form of Rights Agreement between Covance Inc. and Harris Trust and
              Savings Bank, dated December 31, 1996.


                                                                              77
<PAGE>



10.1          Tax Sharing Agreement among Corning Incorporated, Corning Clinical
              Laboratories Inc. and Covance Inc., dated December 31, 1996.

10.2          Spin-Off Tax Indemnification Agreement between Corning
              Incorporated and Covance Inc., dated December 31, 1996.

10.3          Spin-Off Tax Indemnification Agreement between Covance Inc. and
              Corning Clinical Laboratories Inc., dated December 31, 1996.

10.4          Spin-Off Tax Indemnification Agreement between Corning Clinical
              Laboratories Inc. and Covance Inc., dated December 31, 1996.

10.5          Credit Agreement among Covance Inc., NationsBank, N.A., Wachovia
              Bank of Georgia, N.A. and Lenders named therein, dated November
              26, 1996.

10.6          Employee Stock Ownership Plan.

10.7          Stock Purchase Savings Plan, as amended.

10.8          Employee Stock Purchase Plan.

10.9          Employee Equity Participation Plan.

10.10         Executive Retirement Supplemental Plan.

10.11         Restricted Share Plan.

10.12         Directors' Restricted Stock Plan.

10.13         Directors' Deferred Compensation Plan.

10.14         Employment Agreement between Christopher Kuebler and Covance Inc.

10.15         Executive Employment Letters and Schedule.

21            Subsidiaries.

23            Consent of Price Waterhouse LLP.

27            Financial Data Schedules. (Edgar filing only)



(d) Financial Statement Schedules.

           None.


                                                                              78

<PAGE>

                                   SIGNATURES



Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the Registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                   COVANCE INC.

Dated: March 24, 1997              By:   /s/ Christopher A. Kuebler
                                        ---------------------------
                                        Christopher A. Kuebler
                                        Chairman of the Board, President
                                        and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the Registrant and
in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
Signature                                           Title                                   Date
<S>                                       <C>                                           <C>
/s/ Christopher A. Kuebler
- ----------------------------------
Christopher A. Kuebler                    Chairman of the Board,                        March 24, 1997
                                          President and
                                          Chief Executive Officer
                                          (Principal Executive Officer)

/s/ Charles C. Harwood, Jr.
- ----------------------------------
Charles C. Harwood, Jr.                   Corporate Senior Vice President               March 24, 1997
                                          and Chief Financial Officer
                                          (Principal Financial Officer)

/s/ Michael Giannetto
- ----------------------------------
Michael Giannetto                         Vice President and Controller                 March 24, 1997
                                          (Principal Accounting Officer)

/s/ Robert M. Baylis
- ----------------------------------
Robert M. Baylis                          Director                                      March 24, 1997

/s/ Van C. Campbell
- ----------------------------------
Van C. Campbell                           Director                                      March 24, 1997

/s/ Irwin Lerner
- ----------------------------------
Irwin Lerner                              Director                                      March 24, 1997

/s/ J. Randall MacDonald
- ----------------------------------
J. Randall MacDonald                      Director                                      March 24, 1997

/s/ Nigel W. Morris
- ----------------------------------
Nigel W. Morris                           Director                                      March 24, 1997

/s/ William C. Ughetta
- ----------------------------------
William C. Ughetta                        Director                                      March 24, 1997
</TABLE>

<PAGE>




                                  EXHIBIT INDEX

Exhibit
Number             Description
- -------------      ---------------------------------------------------------
2.1                Transaction Agreement among Corning Incorporated, Corning
                   Life Science Inc., Corning Clinical Laboratories Inc.
                   (Delaware), Covance Inc. and Corning Clinical Laboratories
                   Inc. (Michigan), dated November 22, 1996. Filed herewith.

3.1                Certificate of Incorporation. Incorporated by reference to
                   Registrant's filing on Amendment No. 2 on Form 10, filed with
                   the SEC on November 19, 1996.

3.2                By-Laws. Incorporated by reference to Registrant's filing on
                   Amendment No. 2 on Form 10, filed with the SEC on November
                   19, 1996.

4.1                Form of Common Stock Certificate. Incorporated by reference
                   to Registrant's filing on Amendment No. 3 on Form 10, filed
                   with the SEC on November 25, 1996.

4.2                Form of Rights Agreement between Covance Inc. and Harris
                   Trust and Savings Bank, dated December 31, 1996. Incorporated
                   by reference to Registrant's filing on Amendment No. 2 on
                   Form 10, filed with the SEC on November 19, 1996.

10.1               Tax Sharing Agreement among Corning Incorporated, Corning
                   Clinical Laboratories Inc. and Covance Inc., dated December
                   31, 1996. Filed herewith.

10.2               Spin-Off Tax Indemnification Agreement between Corning
                   Incorporated and Covance Inc., dated December 31, 1996. Filed
                   herewith.

10.3               Spin-Off Tax Indemnification Agreement between Covance Inc.
                   and Corning Clinical Laboratories Inc., December 31, 1996.
                   Filed herewith.

10.4               Spin-Off Tax Indemnification Agreement between Corning
                   Clinical Laboratories Inc. and Covance Inc., dated December
                   31, 1996. Filed herewith.

10.5               Credit Agreement among Covance Inc., NationsBank, N.A.,
                   Wachovia Bank of Georgia, N.A. and Lenders named therein,
                   dated November 26,1996. Filed herewith.

10.6               Employee Stock Ownership Plan. Filed herewith.

10.7               Stock Purchase Savings Plan, as amended. Filed herewith.

10.8               Employee Stock Purchase Plan. Filed herewith.

10.9               Employee Equity Participation Plan. Incorporated by reference
                   to Registrant's filing on Amendment No. 3 on Form 10, filed
                   with the SEC on November 25, 1996.

10.10              Executive Retirement Supplemental Plan. Filed herewith.

10.11              Restricted Share Plan. Filed herewith.

10.12              Directors' Restricted Stock Plan. Filed herewith.

10.13              Directors' Deferred Compensation Plan. Filed herewith.

10.14              Employment Agreement between Christopher Kuebler and Covance
                   Inc. Filed herewith.

10.15              Executive Employment Letters and Schedule. Filed herewith.

21                 Subsidiaries. Incorporated by reference to Registrant's
                   filing on Amendment No. 2 on Form 10, filed with the SEC on
                   November 19, 1996.

23                 Consent of Price Waterhouse LLP. Filed herewith.

27                 Financial Data Schedules. (Edgar filing only) Filed herewith.








================================================================================


                  ---------------------------------------------


                              TRANSACTION AGREEMENT

                  ---------------------------------------------



                          dated as of November 22, 1996

                                  by and among

                              CORNING INCORPORATED,

                           CORNING LIFE SCIENCES INC.,

                 CORNING CLINICAL LABORATORIES INC. (Delaware),

                                  COVANCE INC.,

                                       and

                  CORNING CLINICAL LABORATORIES INC. (Michigan)




================================================================================



<PAGE>




                                TABLE OF CONTENTS



<TABLE>
         <S>            <C>                                                                                     <C>
                                                                                                                Page
                                    ARTICLE I
                                   DEFINITIONS

         SECTION 1.01.  General.................................................................................  2
         SECTION 1.02.  References; Interpretation..............................................................  7

                                   ARTICLE II
             DISTRIBUTIONS AND OTHER TRANSACTIONS; CERTAIN COVENANTS

         SECTION 2.01.  Conditions Precedent....................................................................  7
         SECTION 2.02.  The Distributions and Other Transactions................................................  8
         SECTION 2.03.  Treatment of Fractional Shares.......................................................... 12
         SECTION 2.04.  Certain Intercompany Financial and Other Arrangements................................... 12
         SECTION 2.05.  Certain Indebtedness and Capital Structure.............................................. 13
         SECTION 2.06.  Further Assurances...................................................................... 13
         SECTION 2.07.  No Representations or Warranties........................................................ 14
         SECTION 2.08.  Guarantees.............................................................................. 14
         SECTION 2.09.  Certain Transactions.................................................................... 15
         SECTION 2.10.  Insurance............................................................................... 15

                                   ARTICLE III
                                 INDEMNIFICATION

         SECTION 3.01.  Indemnification by Corning.............................................................. 15
         SECTION 3.02.  Indemnification by CCL.................................................................. 22
         SECTION 3.03.  Indemnification by Covance.............................................................. 23
         SECTION 3.04.  Adjustments for Indemnification Obligations............................................. 23
         SECTION 3.05.  Procedures for Indemnification - Third Party Claims..................................... 23
         SECTION 3.06.  Survival of Indemnities................................................................. 25
         SECTION 3.07.  Payments................................................................................ 25

                                   ARTICLE IV
                              ACCESS TO INFORMATION

         SECTION 4.01.  Provision of Corporate Records.......................................................... 25
         SECTION 4.02.  Access to Information................................................................... 25
         SECTION 4.03.  Reimbursement........................................................................... 26
         SECTION 4.04.  Confidentiality......................................................................... 26

                                    ARTICLE V
                               DISPUTE RESOLUTION

         SECTION 5.01.  Good Faith Negotiations................................................................. 27
         SECTION 5.02.  Procedure............................................................................... 27

<PAGE>


                                       ii

                                   ARTICLE VI
                               GENERAL PROVISIONS

         SECTION 6.01.  Expenses................................................................................ 28
         SECTION 6.02.  Notices................................................................................. 28
         SECTION 6.03.  Complete Agreement; Construction........................................................ 29
         SECTION 6.04.  Ancillary Agreements.................................................................... 29
         SECTION 6.05.  Counterparts............................................................................ 29
         SECTION 6.06.  Survival of Agreements.................................................................. 29
         SECTION 6.07.  Waiver.................................................................................. 29
         SECTION 6.08.  Amendments.............................................................................. 30
         SECTION 6.09.  Assignment.............................................................................. 30
         SECTION 6.10.  Successors and Assigns.................................................................. 30
         SECTION 6.11.  Termination............................................................................. 30
         SECTION 6.12.  Subsidiaries............................................................................ 30
         SECTION 6.13.  Third Party Beneficiaries............................................................... 30
         SECTION 6.14.  Headings................................................................................ 30
         SECTION 6.15.  Specific Performance.................................................................... 30
         SECTION 6.16.  Governing Law........................................................................... 31
         SECTION 6.17.  Public Announcements.................................................................... 31
         SECTION 6.18.  Severability............................................................................ 31





<PAGE>


                                      iii


         SCHEDULES
          

         Schedule 2.08     Guarantees

         EXHIBITS

         Exhibit A         Forms of Contribution Agreement, Liabilities Undertaking, Bill of Sale
                           and Assignment and Instrument of Assignment and Assumption
         Exhibit B         Form of Plan of Liquidation and Dissolution of CLSI
         Exhibit C         Certificate of Ownership and Merger and Certificate of Merger, with
                           attached Agreement and Plan of Merger and Complete Liquidation
                           (Covance CAPS into Covance)
         Exhibit D         Form of Insurance Agreement
         Exhibit E         Form of Services Agreement
         Exhibit F         Form of Spin-off Tax Indemnification Agreements
         Exhibit G         Form of Tax Sharing Agreement
         Exhibit H         Forms of Amended Charter and By-Laws of CCL
         Exhibit I         Forms of Amended Charter and By-Laws of Covance


</TABLE>



<PAGE>




                  TRANSACTION AGREEMENT dated as of November 22, 1996, by and
among CORNING INCORPORATED, a New York corporation ("Corning"), CORNING LIFE
SCIENCES INC., a Delaware corporation ("CLSI"), CORNING CLINICAL LABORATORIES
INC., a Delaware corporation ("CCL"), COVANCE INC., a Delaware corporation
("Covance") and CORNING CLINICAL LABORATORIES INC., a Michigan corporation ("CCL
(MI)").


                              W I T N E S S E T H:

                  WHEREAS, Corning is the common parent of a consolidated group
which includes CLSI, CCL, Covance and CCL (MI);

                  WHEREAS, the Board of Directors of Corning has determined that
it is appropriate and desirable to distribute to the holders of shares of common
stock, par value $0.50 per share, of Corning (the "Corning Common Shares") all
the outstanding shares of common stock of CCL (the "CCL Common Stock") and,
immediately following such distribution, for CCL to distribute to the holders of
CCL Common Stock all the outstanding shares of common stock of Covance (the
"Covance Common Stock");

                  WHEREAS, each of Corning, CCL and Covance has determined that
it is necessary and desirable to set forth the principal corporate transactions
required to effect such distribution and to set forth other agreements that will
govern certain other matters following the distribution;

                  WHEREAS, each of Corning, CCL and Covance has determined that
it is necessary and desirable to allocate and assign responsibility for those
liabilities in respect of the activities of the businesses of such entities on
the Distribution Date (as defined herein) and those liabilities in respect of
other businesses and activities of Corning and its former subsidiaries and other
matters;

                  WHEREAS, Corning currently owns 100% of the stock of CLSI;

                  WHEREAS, CLSI currently owns 100% of the stock of CCL;

                           WHEREAS, CCL currently owns 100% of the stock of each
                  of Covance and CCL (MI);

                           WHEREAS, Covance currently owns 100% of the stock of
                  Covance Clinical and Periapproval Services Inc. (formerly
                  Corning Besselaar, Inc.) ("Covance CAPS"); and



<PAGE>


                                        2

                  WHEREAS, prior to the Distribution Date, CLSI will contribute
to CCL substantially all of its assets other than the stock of CCL in exchange
for additional shares of CCL Common Stock, shares of voting preferred stock of
CCL and cash and will contribute to CCL (MI) certain of its obligations and
liabilities and Corning will cause CLSI to dissolve and Covance CAPS to be
merged with and into Covance.

                  NOW, THEREFORE, in consideration of the mutual agreements,
provisions and covenants contained in this Agreement, the parties hereby agree
as follows:


                                    ARTICLE I
                                   DEFINITIONS

                  SECTION 1.01. General. As used in this Agreement, the
following terms shall have the following meanings (such meanings to be equally
applicable to both the singular and plural forms of the terms defined):

                  "Action" shall mean any action, suit, arbitration, inquiry,
proceeding or investigation by or before any court, any governmental or other
regulatory or administrative agency, body or commission or any arbitration
tribunal.

                  "Affiliate" shall mean, when used with respect to a specified
person, another person that directly, or indirectly through one or more
intermediaries, will control or will be controlled by or will be under common
control with the person specified immediately following the Effective Time.

                  "Agent" shall have the meaning as defined in Section 2.02(g).

                  "Agreement Disputes" shall have the meaning as defined in
         Section 5.01.

                  "Ancillary Agreements" shall mean the Insurance Agreement, the
         Intellectual Property Agreement, the Services Agreement, the Spin-off
         Tax Indemnification Agreements and the Tax Sharing Agreement.

                  "Assignee" shall have the meaning as defined in Section
         2.02(i)(ii).

                  "CCL" shall mean Corning Clinical Laboratories Inc., a
         Delaware corporation.

                  "CCL Business" shall mean all businesses and operations
         conducted by (i) CLSI, MRL Nucor, Inc. and all current and former
         subsidiaries of CLSI (other than Covance Biotechnology Services Inc.
         (formerly CORNING Bio Inc.), Covance and its 



<PAGE>


                                        3

Subsidiaries, Pharmaceutical Laboratory Services, Inc., Quanterra Incorporated,
California Analytical Laboratory, Chemical Research Laboratories, Inc., Enseco
Incorporated, ERCO, Rocky Mountain Analytical Laboratory and Wadsworth/Alert
Laboratories, Inc.), including without limitation CCL (but excluding in any
event the environmental testing business previously conducted by CCL); and (ii)
any business entities acquired or established by or for CCL or any of its
Subsidiaries after the date of this Agreement.

                  "CCL Indemnitees" shall mean CCL, each Affiliate of CCL, each
of their respective directors and officers and each of the heirs, executors,
successors and assigns of any of the foregoing.

                  "CCL Liabilities" shall mean, collectively, (i) all the
Liabilities of CCL and its Subsidiaries under this Agreement and any of the
Ancillary Agreements, and (ii) all the Liabilities of the parties hereto or
their respective Subsidiaries (whenever arising whether prior to, at or
following the Effective Time) arising out of or in connection with or otherwise
relating to the management or conduct before or after the Effective Time of the
CCL Business.

                  "CCL (MI)" shall mean Corning Clinical Laboratories Inc., a
Michigan corporation.

                  "CCL Record Holders" shall mean all holders of CCL Common
Stock as of the Distribution Record Date, provided that the CCL Record Holders
shall be deemed to be determined immediately following the distribution of CCL
Common Stock to all Corning Record Holders.

                  "CLSI" shall mean Corning Life Sciences Inc., a Delaware
         corporation.

                  "CLSI Revolver" shall mean the Revolving Credit Agreement
dated December 1, 1994 between Corning and CLSI.

                  "Code" shall mean the Internal Revenue Code of 1986, as
amended, and the Treasury regulations promulgated thereunder, including any
successor legislation.

                           "Commission" shall mean the Securities and Exchange
                  Commission.

                  "Company Policies" shall mean all Policies, current or past,
which are or at any time were maintained by or on behalf of or for the benefit
or protection of Corning or any of its predecessors which relate to the Corning
Business, the CCL Business or the Covance Business, or current or past
directors, officers, employees or agents of any of the foregoing Businesses.




<PAGE>


                                        4


                  "Corning" shall mean Corning Incorporated, a New York
         corporation.

                  "Corning Business" shall mean (i) all businesses and
operations of Corning and its subsidiaries other than the CCL Business and the
Covance Business and (ii) the environmental testing business previously
conducted by CCL and its Subsidiaries, including California Analytical
Laboratory, Chemical Research Laboratories, Inc., Enseco Incorporated, ERCO,
Quanterra Incorporated, Rocky Mountain Analytical Laboratory and Wadsworth/Alert
Laboratories, Inc.

                  "Corning Indemnitees" shall mean Corning, each Affiliate of
Corning, each of their respective directors and officers and each of the heirs,
executors, successors and assigns of any of the foregoing.

                  "Corning Liabilities" shall mean all the Liabilities of
Corning and its Subsidiaries under this Agreement and any of the Ancillary
Agreements, and all the Liabilities of Corning and its subsidiaries that are not
CCL Liabilities or Covance Liabilities including, without limitation, all
Liabilities under any employee benefit plans maintained by Corning and any stock
option employment or consulting agreements to which Corning is a party,
including any such benefit plans or agreements covering or with persons who are
or were employees of CCL or Covance and their respective Subsidiaries.
Notwithstanding the foregoing, the remaining payment obligations under the
Agreement dated June 7, 1995 among Corning, CLSI and Ralph H. Thurman and the
Consulting Agreement dated June 7, 1995 among Corning, CLSI and Ralph H. Thurman
shall be CCL Liabilities and not Corning Liabilities.

                  "Corning Record Holders" shall mean all holders of record of
Corning Common Shares as of the Distribution Record Date.

                  "Covance" shall mean Covance Inc., a Delaware corporation
(formerly known as Corning Pharmaceutical Services Inc.).

                  "Covance Business" shall mean all businesses and operations
conducted by (i) all current and former subsidiaries of Covance and by Covance
Biotechnology Services Inc. and Pharmaceutical Laboratory Services, Inc. prior
to the Effective Time; and (ii) any business entities acquired or established by
or for Covance or any of its Subsidiaries after the date of this Agreement.

                  "Covance Indemnitees" shall mean Covance, each Affiliate of
Covance, each of their respective directors and officers and each of the heirs,
executors, successors and assigns of any of the foregoing.



<PAGE>


                                        5

                  "Covance Liabilities" shall mean, collectively, (i) all the
Liabilities of Covance and its Subsidiaries under this Agreement and any of the
Ancillary Agreements, and (ii) all the Liabilities of the parties hereto or
their respective Subsidiaries (whenever arising whether prior to, at or
following the Effective Time) arising out of or in connection with or otherwise
relating to the management or conduct before or after the Effective Time of the
Covance Business.

                  "Distribution Date" shall mean December 31, 1996 or such later
date as may hereafter be determined by Corning's Board of Directors as the date
as of which the Distributions shall be effected.

                  "Distribution Record Date" shall mean December 31, 1996 or
such later date as may hereafter be determined by Corning's Board of Directors
as the record date for the Distributions.

                  "Distributions" shall mean the two consecutive distributions
in the following order on the Distribution Date to (i) all Corning Record
Holders of the CCL Common Stock owned by Corning and (ii) all CCL Record Holders
of the Covance Common Stock owned by CCL.

                  "Effective Time" shall mean 11:59 p.m., New York time, on the
Distribution Date.

                  "Exchange Act" shall mean the Securities and Exchange Act of
1934, as amended.

                  "Indemnifiable Losses" shall mean any and all losses,
liabilities, claims, damages, demands, costs or expenses (including, without
limitation, reasonable attorneys' fees and any and all reasonable and necessary
out-of-pocket expenses) whatsoever, including any and all losses, liabilities,
claims, damages, demands, costs or expenses reasonably incurred in
investigating, preparing for or defending against any Actions or potential
Actions, provided, however, that such Indemnifiable Losses shall not include
Taxes or other amounts indemnified against under the Spin-off Tax
Indemnification Agreements and the Tax Sharing Agreement.

                  "Indemnifying Party" shall have the meaning as defined in
Section 3.04.

                  "Indemnitee" shall have the meaning as defined in Section
3.04.

                  "Information Statement" shall mean the Information Statement
sent to all the Record Holders in connection with the Distributions, including
any amendment or supplement thereto.




<PAGE>


                                        6


                  "Insurance Agreement" shall mean the Insurance Agreement among
Corning, CCL and Covance, in substantially the form attached hereto as Exhibit
D.

                  "Intellectual Property Agreement" shall mean the Intellectual
Property and Licensing Agreement among Corning, CCL and Covance, in a form to be
agreed upon by the parties to this Agreement.

                  "Liabilities" shall mean any and all debts, liabilities and
obligations, absolute or contingent, matured or unmatured, liquidated or
unliquidated, accrued or unaccrued, known or unknown, whenever arising,
including, without limitation, those debts, liabilities and obligations arising
under any law, rule, regulation, Action, threatened Action, order or consent
decree of any court, any governmental or other regulatory or administrative
agency or commission or any award of any arbitration tribunal, and those arising
under any contract, guarantee, commitment or undertaking.

                  "person" shall mean any natural person, corporation, business
trust, joint venture, association, company, partnership or government, or any
agency or political subdivision thereof.

                  "Policies" shall mean insurance policies and insurance
contracts of any kind (other than life and benefits policies or contracts),
including, without limitation, primary, excess and umbrella policies,
comprehensive general liability policies, fiduciary liability, automobile,
aircraft, property and casualty, workers' compensation and employee dishonesty
insurance policies, bonds and self-insurance and captive insurance company
arrangements, together with the rights, benefits and privileges thereunder.

                  "Record Holders" shall mean the CCL Record Holders and the
Corning Record Holders, collectively.

                  "Records" shall have the meaning as defined in Section 4.01.

                  "Registration Statements" shall mean the registration
statements on Form 10 in respect of the CCL Common Stock and the Covance Common
Stock required to be filed with the Commission pursuant to Rule 12(b) under the
Exchange Act.

                  "Rules" shall have the meaning as defined in Section 5.02.

                  "Services Agreement" shall mean the Services Agreement among
Corning, CCL and Covance, in substantially the form attached hereto as Exhibit
E.


<PAGE>


                                        7


                  "Spin-off Tax Indemnification Agreement" shall mean each of
the Spin-off Tax Indemnification Agreements between or among two or more of
Corning, CCL and Covance, in substantially the form attached hereto as Exhibit
F.

                  "Subsidiary" shall mean any corporation, partnership or other
entity of which another entity (i) will own, immediately following the Effective
Time, directly or indirectly, ownership interests sufficient to elect a majority
of the board of directors (or persons performing similar functions)
(irrespective of whether at the time any other class or classes of ownership
interests of such corporation, partnership or other entity shall or might have
such voting power upon the occurrence of any contingency) or (ii) will be,
immediately following the Effective Time, a general partner or an entity
performing similar functions; provided that Bio Imaging Technologies Inc. will
be deemed to be a Subsidiary of Covance and, National Imaging Associates will be
deemed to be a Subsidiary of CCL, in each case, for all purposes of this
Agreement.

                  "Tax" shall mean all federal, state, local and foreign gross
or net income, gross receipts, withholding, franchise, transfer, estimated or
other tax or similar charges and assessments, including all interest, penalties
and additions imposed with respect to such amounts.

                  "Tax Sharing Agreement" shall mean the Tax Sharing Agreement
among Corning, CCL and Covance, in substantially the form attached hereto as
Exhibit G.

                  "Third Party Claim" shall have the meaning as defined in
         Section 3.05.

                  SECTION 1.02. References; Interpretation. References to an
"Exhibit" or to a "Schedule" are, unless otherwise specified, to one of the
Exhibits or Schedules attached to this Agreement, and references to a "Section"
are, unless otherwise specified, to one of the Sections of this Agreement.


                                   ARTICLE II
             DISTRIBUTIONS AND OTHER TRANSACTIONS; CERTAIN COVENANTS

                  SECTION 2.01. Conditions Precedent. Neither the Distributions
nor the related transactions set forth in this Agreement or in the Ancillary
Agreements shall become effective unless the following conditions have been
satisfied or waived by Corning on or before the Effective Time:

                  (a)      The Registration Statements shall have been filed by
                           CCL and Covance, as applicable, with, and declared
                           effective by, the Commission and the Information
                           Statement shall have been mailed in a timely manner
                           to all holders of Corning Common Shares prior to the
                           Distribution Date.




<PAGE>


                                        8

                  (b)      Corning shall have received a favorable ruling from
                           the Internal Revenue Service to the effect that the
                           Distributions qualify as tax-free distributions under
                           Section 355 of the Code.

                  (c)      Corning shall have received a favorable response from
                           the Commission to the "no-action request" letter
                           describing the Distributions filed by Corning with
                           the Commission.

                  (d)      The New York Stock Exchange shall have approved the
                           CCL Common Stock and Covance Common Stock for listing
                           on its exchange, subject to official notice of
                           distribution.

                  (e)      The financing arrangements among and between the
                           parties contemplated in the Information Statement
                           will have been consummated. CCL and Covance each
                           shall pay all of the expenses associated with their
                           respective financings.

                  SECTION 2.02. The Distributions and Other Transactions. (a)
         Certain Transactions. Prior to the Distribution Date:

                  (i) Covance CAPS shall be merged with and into Covance
         pursuant to the Certificate of Ownership and Merger between Covance
         CAPS and Covance and the Certificate of Merger between Covance CAPS and
         Covance, in substantially the forms attached hereto as Exhibit C, and
         in accordance with all applicable filing requirements under the
         Delaware General Corporation Law and the New Jersey Business
         Corporation Act. As a result of the merger, Covance CAPS will cease to
         exist and Covance will acquire the assets of Covance CAPS and assume
         (or take the assets of Covance CAPS subject to) the liabilities of
         Covance CAPS.

                  (ii) CLSI will contribute to CCL all of CLSI's assets other
         than the stock of CCL and CLSI's rights under certain agreements that
         CLSI agrees to transfer pursuant to Section 2.02(i) in exchange for
         200,000 additional shares of CCL Common Stock, 1,000 shares of voting
         preferred stock of CCL and $250,000 in cash from CCL pursuant to (A)
         the Contribution Agreement between CLSI and CCL, (B) the Liabilities
         Undertaking between CLSI and CCL (C) the Instrument of Assignment and
         Assumption between CLSI and CCL and (D) the Bill of Sale and Assignment
         between CLSI and CCL, each in substantially the forms attached hereto
         as Exhibit A, and in accordance with all applicable filing requirements
         under the Delaware General Corporation Law. As a result of such
         transactions, CCL will acquire the assets of CLSI and assume (or take
         the assets of CLSI subject to) the liabilities of CLSI other than (A)
         such obligations and liabilities for which either Corning or Covance is
         responsible under this Agreement or the Ancillary Agreements and (B)
         any obligations that CCL(MI) assumes pursuant to



<PAGE>


                                        9

         the following sentence. CCL (MI) shall assume (A) the first $2 million
         in principal amount of obligations of CLSI owed by CLSI to Corning
         under the CLSI Revolver and (B) the first $2 million of CLSI's
         obligations under Section 6.06(a) of the Agreement and Plan of Merger
         among Corning, Opera Acquisition Corp. and CLSI (then known as Damon
         Corporation). Following such contributions and assumptions, CLSI shall
         adopt a plan of liquidation and dissolve pursuant to the Plan of
         Liquidation and Dissolution of CLSI, substantially in the form attached
         hereto as Exhibit B, and in accordance with all applicable filing
         requirements under the Delaware General Corporation Law. As a result of
         such liquidation and dissolution, CLSI will distribute to Corning its
         remaining assets, which will consist largely of the capital stock of
         CCL, and CLSI will cease to exist.

                  (iii) No earlier than one day following the effective date for
         the transactions described in Section 2.02(a)(ii), CCL will transfer to
         certain of its subsidiaries the following shares of common stock that
         CCL will have received from CLSI pursuant to the transactions described
         in Section 2.02(a)(ii): (A) the shares of common stock of Corning
         Nichols Institute, (B) the shares of common stock of Corning Clinical
         Laboratories Inc. (Mass.) and (C) the shares of common stock of Corning
         Clinical Laboratories Inc. (MD).

                  (iv) No earlier than three (3) days following the later of the
         effective dates for the transactions described in Sections 2.02(a)(i),
         (ii) and (iii), CCL will transfer its Covance Common Stock, its entire
         interest in Pharmaceutical Laboratory Services, Inc. and its entire
         interest in Covance Biotechnology Services Inc. to Covance by
         delivering to Covance stock certificates representing each of CCL's
         share interests in such companies, accompanied by stock powers duly
         endorsed by CCL and with all required stock transfer tax stamps
         affixed. In connection therewith CCL shall deliver to Covance for
         cancellation the share certificate currently held by it representing
         Covance Common Stock and Covance shall issue to CCL new certificates
         representing the total number of newly-issued shares of Covance Common
         Stock sufficient in number to allow for an orderly and pro rata
         distribution of such Covance Common Stock to the CCL common
         shareholders.

                  (v) No earlier than three (3) days following the later of the
         effective dates for the transactions described in Sections 2.02(a)(i),
         (ii) and (iii), Corning will transfer its CCL Common Stock and its
         entire interest in MRL Nucor, Inc. to CCL by delivering to CCL stock
         certificates representing each of Corning's share interests in CCL and
         MRL Nucor, Inc., accompanied by stock powers duly endorsed by Corning
         and with all required stock transfer tax stamps affixed. In connection
         therewith Corning shall deliver to CCL for cancellation the share
         certificate then held by it representing CCL Common Stock and shall
         receive new certificates representing the total number of newly-issued
         shares of CCL Common Stock sufficient in number to



<PAGE>


                                       10

         allow for an orderly and pro rata distribution of such CCL Common Stock
         to the Corning common shareholders.

                  (b) Ancillary Agreements. On or prior to the Distribution
         Date, each of Corning, CCL and Covance shall have executed and
         delivered to each of the others, each of the Ancillary Agreements.

                  (c) Charters; By-laws. On or prior to the Distribution Date:

                  (i) All necessary actions shall have been taken to provide for
         the amendments of the Articles of Incorporation and By-laws for CCL,
         such amendments to be in substantially the forms attached hereto as
         Exhibit H.

                  (ii) All necessary actions shall have been taken to provide
         for the amendments of the Articles of Incorporation and By-laws for
         Covance, such amendments to be in substantially the forms attached
         hereto as Exhibit I.

                  (d) Benefit Plans. On or prior to the Distribution Date, any
         shareholder approvals deemed necessary for employee benefit plans shall
         have been obtained.

                  (e) Directors. On or prior to the Distribution Date, Corning
         as the sole shareholder of CCL, and CCL, as the sole shareholder of
         Covance, shall have taken all necessary action by written consent on or
         prior to the Distribution Date to elect to the Board of Directors of
         CCL and the Board of Directors of Covance the individuals identified in
         the Information Statement as directors of CCL and Covance,
         respectively.

                  (f) Consents. The parties hereto shall use their commercially
         reasonable efforts to obtain any required consents to assignment of
         agreements hereunder, if applicable.

                  (g) Delivery of Shares to Agent. Corning shall deliver to
         Harris Trust and Savings Bank (the "Agent") the share certificates
         representing the CCL Common Stock and CCL shall deliver to the Agent
         the share certificates representing the Covance Common Stock and
         Corning and CCL shall instruct the Agent to distribute, on or as soon
         as practicable following the Distribution Date, such common stock to
         the Corning Record Holders and the CCL Record Holders, as the case may
         be, as further contemplated by the Information Statement and herein.
         CCL and Covance shall provide all share certificates that the Agent
         shall require in order to effect the Distributions.




<PAGE>


                                       11


                  (h) Sublease. Corning shall have entered into a sublease
         agreement with National Imaging Associates, Inc. with respect to the
         first floor of 10 Mountainview Road, Upper Saddle River, New Jersey.

                  (i) Transfer of Agreements. (i) CLSI hereby agrees that on or
         prior to the date on which it is dissolved, subject to the limitations
         set forth in this Section 2.02(i), it will assign, transfer and convey
         to Covance all of CLSI's rights and obligations under (a) the Capital
         Contribution Agreement and Shareholder Agreement dated February 22,
         1995 among Corning BioPro Inc., CLSI, Richard Hawkins, Dr. John
         Scarlett, Robert F. Amundsen and Dr. Nona Niland, (b) any and all
         existing stock option agreements between CLSI, Corning Bio Inc. and
         individual employees of Corning Bio Inc., (c) the Registration
         Agreement dated as of February 22, 1995 by and between Corning BioPro
         Inc. and CLSI, (d) the Joint Escrow Instructions dated February 22,
         1995 by and between Corning BioPro Inc., CLSI, Robert F. Amundsen and
         the Escrow Agent named therein, and (e) the Joint Escrow Instructions
         dated February 22, 1995 by and between Corning BioPro Inc., CLSI, Dr.
         John Scarlett and the Escrow Agent named therein. CLSI hereby further
         agrees that on or prior to the date on which it is dissolved, subject
         to the limitations set forth in this Section 2.02(i), it will assign,
         transfer and convey to Corning all of its rights and obligations under
         the lease agreement dated October 5, 1995 between 2154 Trading
         Corporation and CLSI with respect to 10 Mountainview Road, Upper Saddle
         River, New Jersey and a sublease to National Imaging Associates with
         respect to a portion of such premises. CCL hereby agrees that on or
         prior to the Distribution Date or as soon as reasonably practicable
         thereafter, subject to the limitations set forth in this Section
         2.02(i), it will assign, transfer and convey to Corning all of CCL's
         rights and obligations under the Asset Transfer Agreement dated as of
         May 2, 1994, as amended, among CCL, International Technology
         Corporation, IT Corporation and Quanterra Incorporated and the related
         closing documents thereunder, including without limitation the General
         Instrument of Assignment and Assumption dated June 28, 1994 between CCL
         and Quanterra Incorporated. Corning hereby agrees that on or prior to
         the Distribution Date or as soon as reasonably practicable thereafter,
         subject to the limitations set forth in this Section 2.02(i), it will
         assign, transfer and convey to Covance all of Corning's rights and
         obligations under that certain Registration Agreement dated as of
         February 22, 1995 by and between Corning, Dr. Nona Niland, Dr. John
         Scarlett, Robert F. Amundsen and Richard Hawkins.

                  (ii) The assignee of any  agreement  assigned,  in whole or in
         part, hereunder (an "Assignee") shall assume and agree to pay, perform,
         and  fully  discharge  all  obligations  of  the  assignor  under  such
         agreement or such  Assignee's  related  portion of such  obligations as
         determined  in  accordance  with the terms of the  relevant  agreement,
         where determinable on the face thereof,  and otherwise as determined in
         accordance with the practice of the parties prior to the Distribution.




<PAGE>


                                       12

                  (iii) Notwithstanding anything in this Agreement to the
         contrary, this Agreement shall not constitute an agreement to assign
         any agreement, in whole or in part, or any rights thereunder if the
         agreement to assign or attempt to assign, without the consent of a
         third party, would constitute a breach thereof or in any way adversely
         affect the rights of the Assignee thereof. Until such consent is
         obtained, or if an attempted assignment thereof would be ineffective or
         would adversely affect the rights of any party hereto so that the
         Assignee would not, in fact, receive all such rights, the parties will
         cooperate with each other in any arrangement designed to provide for
         the Assignee the benefits of, and to permit the Assignee to assume
         liabilities under, any such agreement.

                  (iv) Corning understands and agrees that approximately 10,968
         Corning Common Shares are held to secure certain claims of CCL under
         that Escrow Agreement dated as of October 9, 1994 (the "Escrow
         Agreement") among Corning, The First National Bank of Boston and former
         shareholders of Moran Research Labs, as amended, and will act at CCL's
         direction and at CCL's expense with respect to those shares. The
         remaining Corning Common Shares held under the Escrow Agreement are
         being held for the benefit of Corning.

                  (j) Other Transactions. On or prior to the Distribution Date,
         each of Corning, CCL and Covance shall have consummated those other
         transactions in connection with the Distributions that are contemplated
         by the Information Statement and the ruling request submission by
         Corning to the Internal Revenue Service dated June 17, 1996, as
         supplemented, and not specifically referred to in subparagraphs (a)-(i)
         above.

                  SECTION 2.03. Treatment of Fractional Shares. As soon as
practicable after the Distribution Date, the Agent shall determine the number of
whole shares and fractional shares of CCL and Covance allocable to each Corning
Record Holder and CCL Record Holder, respectively, as of the Distribution Record
Date, to aggregate all such fractional shares and sell the whole shares obtained
thereby, in open market transactions or otherwise, in each case at then
prevailing trading prices, and to cause to be distributed to each such holder to
which a fractional share shall be allocable such holder's ratable share of the
proceeds of such sale, after making appropriate deductions of the amount
required to be withheld for federal income tax purposes and after deducting an
amount equal to all brokerage charges, commissions and transfer taxes attributed
to such sale. In determining the manner and timing of selling the aggregated
fractional shares, the Agent shall use its independent judgment and shall
neither consult with nor communicate its plans to Corning, CCL or Covance.

                  SECTION 2.04. Certain Intercompany Financial and Other
Arrangements. (a) Intercompany Accounts. Without limiting the terms of Section
2.05, all intercompany receivables, payables and loans (other than receivables,
payables and loans otherwise specifically provided for in any of the Ancillary
Agreements or hereunder), including, without limitation, in respect of any cash
balances, any cash balances representing deposited checks or drafts for which
only a provisional credit has been allowed or any cash held in any centralized
cash management system, between Corning, CCL, Covance or any of their respective
Subsidiaries, on the one hand, and Corning, CCL, Covance or any of their
respective Subsidiaries, on the other hand, shall, as of the Effective Time, be
settled or contributed to capital, in each case as may be agreed in writing
prior to the Effective Time by duly authorized representatives of Corning, CCL
or Covance, as applicable. Notwithstanding the foregoing, on or after the
Distribution Date, CCL shall make a payment to Corning in an amount equal to



<PAGE>


                                       13

the excess, if any, of (i) the aggregate amount of cash and cash equivalents
held by CCL and its Subsidiaries on the Distribution Date over (ii) the sum of
the aggregate principal amount of Working Capital Loans and Swingline Loans
(each as defined in the credit agreement among CCL and the banks listed therein
to be entered into prior to the Distribution Date) outstanding on the
Distribution Date, plus $40,000,000 plus the net cash proceeds from the sales of
assets identified in the credit agreement received on or prior to the
Distribution Date. If the amount calculated in accordance with clause (ii) of
the preceding sentence, less $10,000,000, is greater than the amount calculated
in accordance with clause (i) then, on or after the Distribution Date, Corning
shall make a payment to CCL in an amount equal to the difference between such
calculations.

                  (b) Operations in Ordinary Course. Each of CCL and Covance
covenants and agrees that, except as otherwise provided in any Ancillary
Agreement, during the period from the date of this Agreement through the
Distribution Date, it will, and will cause any entity that is a Subsidiary of
such party at any time during such period to, conduct its business in a manner
substantially consistent with current and past operating practices and in the
ordinary course, including, without limitation, with respect to the payment and
administration of accounts payable and the administration of accounts
receivable, the purchase of capital assets and equipment and the management of
inventories.

                  SECTION 2.05. Certain Indebtedness and Capital Structure.
Corning, CCL and Covance each agree to use their respective commercially
reasonable efforts to achieve both an allocation of consolidated indebtedness of
Corning and a capital structure (including cash position) of each of CCL and
Covance so as to substantially reflect the respective capital structures after
the Distributions of CCL and Covance set forth in the Information Statement
under the headings "Capitalization of CCL" and "Capitalization of Covance".

                  SECTION 2.06. Further Assurances. In case at any time after
the Effective Time any further action is reasonably necessary or desirable to
carry out the purposes of this Agreement and the Ancillary Agreements, the
proper officers of each party to this Agreement shall take all such necessary
action. Without limiting the foregoing, Corning, CCL and Covance shall use their
commercially reasonable efforts to obtain all consents and approvals, to enter
into all amendatory agreements and to make all filings and applications that may
be required for the consummation of the transactions contemplated by this
Agreement and the Ancillary Agreements, including, without limitation, all
applicable governmental and regulatory filings.


<PAGE>


                                       14

                 SECTION 2.07. No Representations or Warranties. Each of the 
parties hereto understands and agrees that, except as otherwise expressly 
provided, no party hereto is, in this Agreement, in any Ancillary Agreement or 
in any other agreement or document contemplated by this Agreement or otherwise,
making any representation or warranty whatsoever, including, without limitation,
as to title, value or legal sufficiency.

                  SECTION 2.08. Guarantees. (a) Except as otherwise specified in
any Ancillary Agreement, Corning, CCL and Covance shall use their commercially
reasonable efforts to have, on or prior to the Distribution Date, or as soon as
practicable thereafter, Corning and any of its Subsidiaries removed as guarantor
of or obligor for any CCL Liability or Covance Liability, including, without
limitation, in respect of those guarantees set forth on Schedule 2.08(a), and to
the extent any such guarantee is not removed, CCL or Covance, as the case may
be, will indemnify Corning for all Indemnifiable Losses related to or arising
from such guarantee, in accordance with the procedures set forth in Section 3.05
and will pay Corning a fee reflecting Corning's continuing role as guarantor.

                  (b) Except as otherwise specified in any Ancillary Agreement,
Corning, CCL and Covance shall use their commercially reasonable efforts to
have, on or prior to the Distribution Date, or as soon as practicable
thereafter, CCL and any of its Subsidiaries removed as guarantor of or obligor
for any Corning Liability or Covance Liability, including, without limitation,
in respect of those guarantees set forth on Schedule 2.08(b), and to the extent
any such guarantee is not removed, Corning or Covance, as the case may be, will
indemnify CCL for all Indemnifiable Losses related to or arising from such
guarantee, in accordance with the procedures set forth in Section 3.05 and will
pay CCL a fee reflecting CCL's continuing role as guarantor.

                  (c) Except as otherwise specified in any Ancillary Agreement,
Corning, CCL and Covance shall use their commercially reasonable efforts to
have, on or prior to the Distribution Date, or as soon as practicable
thereafter, Covance and any of its Subsidiaries removed as guarantor of or
obligor for any Corning Liability or CCL Liability, including, without
limitation, in respect of those guarantees set forth on Schedule 2.08(c), and to
the extent any such guarantee is not removed, Corning or CCL, as the case may
be, will indemnify Covance for all Indemnifiable Losses related to or arising
from such guarantee, in accordance with the procedures set forth in Section 3.05
and will pay Covance a fee reflecting Covance's continuing role as guarantor.



<PAGE>


                                       15


                  SECTION 2.09. Certain Transactions. (a) On or prior to the
Distribution Date, and in accordance to Section 2.02(b), Corning, CCL and
Covance shall enter into (i) the Tax Sharing Agreement which shall govern, among
other things, their respective rights and obligations with respect to Taxes of
CCL and Covance and each of their respective Subsidiaries for all periods
through the Distribution Date and certain other tax-related matters; and (ii)
the Spin-off Tax Indemnification Agreements which shall, among other things,
restrict CCL and Covance from engaging in certain activities that might
jeopardize the continuing tax-free treatment of the Distributions.

                  (b) Following the Distribution Date, Corning, CCL and Covance
shall each comply with and otherwise not take any action inconsistent with each
representation and statement made, or to be made, to the Commission in
connection with the "no-action request" letter describing the Distributions
filed by Corning with the Commission.

                  SECTION 2.10. Insurance. Except as contemplated by the
Insurance Agreement, any and all coverage of CCL, Covance and their respective
Subsidiaries under Company Policies has terminated or will terminate (and will
not be replaced by Corning) no later than the Effective Time.


                                   ARTICLE III
                                 INDEMNIFICATION

                  SECTION 3.01. Indemnification by Corning. (a) Except as
otherwise specifically set forth in any provision of this Agreement or of any
Ancillary Agreement, Corning shall indemnify and hold harmless the CCL
Indemnitees and the Covance Indemnitees from and against any and all
Indemnifiable Losses of the CCL Indemnitees and the Covance Indemnitees,
respectively, arising out of, by reason of or otherwise in connection with (i)
the Corning Liabilities or (ii) the breach by Corning of any provision of this
Agreement or any Ancillary Agreement.

                  (b) Corning shall indemnify and hold harmless CCL and its
Subsidiaries from and against any and all monetary payments by or on behalf of
CCL or any of its Subsidiaries (other than criminal fines or penalties imposed
upon former or current employees of CCL or its subsidiaries) to the United
States government or one of the States of the United States or any of their
respective departments, branches or agencies arising out of any investigation or
claim by or on behalf of the United States government or one of the States of
the United States or any of their respective departments, branches or agencies,
whether criminal, civil or administrative in nature which investigation or claim
has been settled prior to the Distribution Date or is pending as of the
Distribution Date pursuant to service of subpoena or other notice of such
investigation to Corning, CCL or any of its Subsidiaries, as well as any qui tam
proceeding for which a complaint was filed prior to the Distribution Date
whether or not Corning, CCL or any Subsidiary of CCL has been served with such
complaint or otherwise been notified of the pendency of such action, but only to
the extent such investigations or claims arise out of or are related to alleged
violations of (i) the federal civil False Claims Act (31 USC ss. 3729, et seq.)
and its criminal counterpart (18 USC ss. 287), (ii) Medicare and Medicaid fraud
(42 USC ss. 1320a-7(b)(a)(1)), (iii) the Civil Monetary Penalties Law (42 USC
ss.ss. 1320a-7a and 1320a-7(b)(b)), (iv) mail fraud and wire fraud statutes (18
USC ss.ss. 1341 and 1343), (v) false statements (18 USC ss. 1301), (vi)
conspiracy (18 USC ss. 371), (vii) money laundering (18 USC ss. 1956, et seq.),
(viii) RICO (18 USC ss. 1961), (ix) Title II of the Health Insurance Portability
and Accountability Act of 1996, (x) Title XVIII of the Social Security



<PAGE>


                                       16

Act (42 USC ss.ss. 1395-1395ccc) (the Medicare statute), (xi) Title XIX of the
Social Security Act (42 USC ss.ss. 1396, et seq.) (the Medicaid statute), (xii)
the Programs Fraud Civil Remedies Act (31 USC ss.ss. 3801, et seq.); or (xiii)
the federal Anti-Kickback Act (42 USC ss.ss. 52, et seq.) arising out of the
billing or alleged overbilling by CCL or any past or present subsidiary of CLSI
(or any of their predecessors) of any federal program or agency, or any
federally supported state health care program or agency, or any beneficiary of
any of them, for services provided to any such beneficiary thereof by CCL, any
Subsidiary of CCL or any past or present subsidiary of CLSI (or any of their
predecessors).

                  (c) In the event that CCL or its Subsidiaries make monetary
payments in excess of forty-two million dollars ($42,000,000) within the period
beginning on the Distribution Date and ending five (5) years thereafter in
respect of claims by nongovernmental persons relating to or arising out of the
investigations or claims referred to in Section 3.01(b) and alleging
overbillings of such person or any beneficiary of such person by CCL, its
Subsidiaries or any past or present subsidiary of CLSI (or any of their
predecessors) for services provided prior to the Distribution Date to such
person or beneficiary thereof by CCL, its Subsidiaries or any past or present
subsidiary of CLSI (or any of their predecessors), then Corning shall indemnify
and hold harmless CCL and its Subsidiaries from and against fifty percent (50%)
of up to fifty million dollars ($50,000,000) in the aggregate of such monetary
payments actually paid by CCL or any Subsidiary of CCL in excess of such
forty-two million dollars ($42,000,000) in respect of such alleged overbillings.

                  (d) (i) Except as otherwise agreed by Corning and CCL or
unless otherwise required by a change in applicable law or regulations, a
contrary judicial decision, adverse determination by a Taxing authority, or a
contrary published ruling (in each case, subsequent to the date hereof), all
payments made by Corning to CCL, or to another party for the benefit of CCL,
pursuant to Section 3.01(b) and Section 3.01(c) shall be treated as nontaxable
capital contributions by Corning to CCL and the parties shall report the
payments consistent with such treatment for Tax purposes.

                  (ii) Each amount indemnified against by Corning pursuant to
Section 3.01(b) and Section 3.01(c) shall be reduced by (1) the product of (x)
the amount of any Tax deduction used to reduce the Tax liability of CCL, any CCL
Subsidiary (CCL and the CCL Subsidiaries shall be referred to in this Section
3.01(d) individually as a "CCL Company" and collectively as the "CCL Companies")
or any combined or consolidated group which has any of the CCL Companies as a
member and which does not have Corning as a member (referred to in this Section
3.01(d) as the "CCL Group") to the extent such Tax deduction is attributable to
the portion of the payment, loss, expense or other item indemnified against by
Corning and (y) the maximum marginal statutory rate (exclusive of any surtax
rate or other marginal rate imposed in lieu of a surtax to eliminate the
benefits of a lower marginal rate) at which the Tax to which such deduction
relates is imposed for the taxable year in which the CCL Company or the CCL
Group uses the Tax deduction to reduce its Tax liability, and (2) the amount of
any other Tax



<PAGE>


                                       17

credit, benefit or other similar item (a "Tax Benefit Item") used to reduce the
Tax liability of any CCL Company or the CCL Group to the extent the Tax Benefit
Item is attributable to the portion of the payment, loss, expense or other item
indemnified against by Corning.

                  (iii) For purposes of determining whether any Tax deduction or
Tax Benefit Item of any CCL Company attributable to the portion of a payment,
loss, expense or other item indemnified against by Corning (a "Corning
Deduction") is used to reduce the Tax liability of any CCL Company or the CCL
Group, it shall be assumed that all losses and deductions of such CCL Company or
the CCL Group (including carryforwards and carrybacks (unless otherwise excluded
below) of net operating losses or other items) other than Corning Deductions are
applied in reduction of such CCL Company's or the CCL Group's Tax liability
before any Corning Deductions are so applied, except that Tax deductions and Tax
Benefit Items attributable to the following items shall be deemed to be applied
to reduce such CCL Company's or the CCL Group's Tax liability after using (in
determining such Tax liability) all available Corning Deductions: (i) Special
Events (as defined below), (ii) claims against which Corning has partially
indemnified CCL pursuant to Section 3.01(c) (other than payments applied toward
the $42,000,000 threshold specified in Section 3.01(c)) and (iii) carrybacks of
losses or other Tax items from Tax years subsequent to the Tax year in which the
amount indemnified against under Sections 3.01(b) or (3.01(c) is paid by
Corning. Special Event shall mean a material event that is unusual in nature or
occurs infrequently (but not both) and is unrelated to normal operations
(including, without limitation, entering or exiting businesses, sales or other
dispositions, litigation or regulatory settlements, restructuring reserves), but
does not include operating items such as start-up expenses and receivable
reserves. For this purpose, material means an event or series of related events
involving amounts exceeding 5 percent of CCL's pre-tax income (determined on a
consolidated basis).

                  (iv) Corning shall make estimated payments to CCL, or another
party for the benefit of CCL, pursuant to Section 3.01(b) and Section 3.01(c)
(the "Estimated Payments") which shall be calculated in good faith by CCL and
Corning by taking into account the adjustments required by Section 3.02(d)(ii)
and Section 3.01(d)(iii) to the extent practical (based on information available
to the parties at the time the Estimated Payment is made as to the proper tax
treatment of the item, CCL's projected Tax liability (including for estimated
Tax payments), or losses for the year in which the Estimated Payment is made
(without taking into account the use of Corning Deductions in future years),
prior Tax return positions and other factors the parties deem relevant).
Estimated Payments shall be paid by Corning (1) if paid to a CCL Company, as
directed by CCL, within 15 business days after written notice from CCL to
Corning indicating that the underlying obligation indemnified against by Corning
has been paid by a CCL Company (which notice shall include any documentation
reasonably requested by Corning establishing the amount and Tax treatment of
such payment) or, (2) if paid directly by Corning for the benefit of a CCL
Company, within 15 business days after written notice from CCL that the
obligation has been settled or is otherwise due (which notice shall include to
whom such payment should be made, the amount of the payment, an executed copy of
the



<PAGE>


                                       18

settlement or other agreement and any other documentation reasonably requested
by Corning establishing the amount and Tax treatment of such payment); provided,
however, that failure to give such notification shall not affect the
indemnification provided hereunder except to the extent Corning shall have been
actually prejudiced as a result of such failure.

                  (v) Within 60 business days following the close of the Tax
year in which an Estimated Payment is made and each tax year thereafter until
the Corning Deductions (as adjusted under Sections 3.01(d)(ii) and 3.01(d)(iii))
are fully used by the CCL Companies to reduce the Tax liability of the CCL Group
or any CCL Member, CCL shall compute the amount by which any reduction in the
Tax liability of a CCL Company or the CCL Group for such Tax year attributable
to a Corning Deduction decreases the after-Tax indemnity payable by Corning
under Sections 3.02(d)(ii) and (iii). CCL shall submit such computation in
writing to Corning (together with such other documentation as is reasonably
necessary to demonstrate how the reduction was computed) for review and approval
by Corning, which approval shall not be unreasonably withheld, within 20
business days of the receipt by Corning of such computation prepared by CCL. If
Corning does not approve of such computation and the parties cannot otherwise
agree on such computation, then the disagreement shall be resolved under Section
3.01(d)(ix). Promptly following agreement by the parties as to the computation
required under this paragraph, either CCL shall pay to Corning an adjusting
payment if the amount of such after-Tax indemnity payable by Corning under
Sections 3.01(d)(ii) and 3.01(d)(iii) is less than the aggregate amount of
Estimated Payments made to CCL for such Tax year and prior years (net of any
prior adjusting payments) or Corning shall pay to CCL an adjusting payment if
the amount of such after-Tax indemnity payable by Corning under Section
3.02(d)(ii) and (iii) exceeds the aggregate amount of Estimated Payments made to
CCL for such Tax year and prior years (net of any prior adjusting payments).

                  (vi) CCL shall consult with Corning and CCL and Corning shall
determine the Tax treatment by any CCL Company or the CCL Group of any payment,
loss, expense or other amount indemnified against by Corning under Section
3.01(b) or Section 3.01(c) provided that neither the CCL Group nor any CCL
Company nor Corning shall be required to take a position on any Tax return for
which there is no reasonable basis. If requested by CCL, Corning at its expense
will provide CCL with an opinion of independent tax counsel selected by Corning
(provided such counsel is not reasonably objected to by CCL) to the effect that
there exists a reasonable basis for the treatment proposed by Corning as part of
such determination. The parties shall report the payments consistent with the
treatment as determined by them for Tax purposes.

                  (vii) If any payments are made by Corning pursuant to Section
3.01(b) or Section 3.01(c), and calculated and paid pursuant to this Section
3.01(d), and the amount of the after-Tax indemnity payable by Corning pursuant
to such sections would have been different if the computation of such
indemnification payment were made at a later time (because of final settlements
or final dispositions of audit adjustments, administrative or judicial
proceedings,



<PAGE>


                                       19

amended returns, utilization or disallowance of Corning Deductions in subsequent
Tax periods or other reasons), then the amount of such indemnification shall be
recomputed by CCL and Corning at such later time by taking into account such
subsequent events and the parties shall make an adjusting payment between each
other as is appropriate because of such recomputation within 15 business days of
their agreement as to the amount of such adjusting payment.

                  (viii) (A) CCL shall notify Corning promptly (and in any event
within 15 business days) after receipt by any CCL Company of written notice of
any demand or claim by a Taxing authority relating to the Tax treatment of a
payment, loss, expense or other item indemnified against by Corning under
Section 3.01(b) or Section 3.01(c). Such notice shall contain factual
information (to the extent known to any CCL Company) describing the asserted tax
treatment in reasonable detail and shall include copies of any notice or other
document received from any Taxing authority. If the Taxing authority proposes in
writing an adjustment to a Corning Deduction, which adjustment if sustained
would reduce the amount of a Corning Deduction or otherwise increase the amount
indemnified against by Corning, CCL shall notify Corning promptly of such
adjustment and of all action taken or proposed to be taken by the Taxing
authority; provided, however, that failure to give such notification shall not
affect the indemnification provided hereunder except to the extent Corning shall
have been actually prejudiced as a result of such failure.

                           (B) If Corning requests within 30 days (or sooner if
the nature of the proposed adjustment so requires) after CCL's notice that the
proposed adjustment to a Corning Deduction be contested, CCL shall contest the
proposed adjustment in good faith upon receipt of an opinion of independent tax
counsel selected by Corning (provided such counsel is not reasonably objected to
by CCL) to the effect that there exists a reasonable basis that CCL will prevail
in such contest; provided, that (i) CCL shall be required to contest any
proposed adjustment beyond the level of administrative proceedings only if the j
aggregate amount of the proposed adjustment (exclusive of penalties, interest
and additions to tax) exceeds $250,000, (ii) CCL shall determine the court of
competent jurisdiction in which to contest the proposed adjustment either before
or after payment of the Tax asserted to be payable as a result thereof, (iii)
Corning shall control with counsel selected by Corning (provided such counsel is
not reasonably objected to by CCL) the prosecution of any contested adjustment
or asserted deficiency in respect of a Corning Deduction arising from an amount
indemnified against by Corning under Section 3.01(b), and CCL shall control with
counsel selected by CCL (provided such counsel is not reasonably objected to by
Corning) the prosecution of any contested adjustment or asserted deficiency in
respect of a Corning Deduction arising from an amount indemnified against by
Corning under Section 3.01(c), (iv) the controlling party shall keep the other
party informed as to the progress of any contest or litigation and, if requested
by such other party, shall consult with such other party's tax counsel, and (v)
the controlling party shall not settle, compromise or otherwise concede the
adjustment or deficiency in respect of a Corning Deduction that the controlling
party is contesting without the consent of the other party, which consent shall
not be unreasonably withheld, provided, further, that any adverse


<PAGE>


                                       20

court determination will be required to be appealed only upon receipt of an
additional opinion from independent tax counsel that there exists a reasonable
basis that the appellate court will reverse such adverse determination. CCL
shall not be required to take any action pursuant to this Section 3.01(viii)(B)
in respect of a contesting Corning Deduction relating to an amount indemnified
against by Corning under Section 3.01(b) unless Corning shall have agreed to pay
(with no net after-Tax cost to CCL) all penalties, interest and additions to tax
that CCL may incur in connection with contesting a proposed adjustment to such
Corning Deduction. The controlling party shall pay all out-of-pocket expenses
and other costs relating to a contest of an adjustment to a Corning Deduction
("Expenses"), including but not limited to fees for attorneys, accountants,
expert witnesses or other consultants retained by (or selected or controlled by)
the controlling party incurred at any time during which the controlling party is
controlling and directing the proceeding in respect of which such fees are
incurred; provided, however, that Corning shall pay CCL, in respect of a
proceeding controlled by CCL that relates to or involves a proposed adjustment
or asserted deficiency in respect of a Corning Deduction attributable to an
amount indemnified against by Corning under Section 3.01(c), that proportion of
the Expenses relating to the proceeding and involving such deduction as is equal
to the ratio of (i) the amount of the adjustment or deficiency that relates to
such Corning Deduction at issue in the proceeding and (ii) the total adjustments
at issue in the proceeding that relate to claims by nongovernmental persons
described in Section 3.01(c).

                           (C)      If asserted liabilities unrelated to the 
matters contemplated herein become grouped with contests arising hereunder, the
parties shall use their respective best efforts to cause the contest arising
hereunder to be the subject of a separate proceeding. If such severance is not
possible, Corning shall control only the prosecution of any contested adjustment
or asserted deficiency in respect of a Corning Deduction arising from an amount
indemnified against by Corning under Section 3.01(b), and CCL shall have sole
discretion to determine the court of competent jurisdiction in which to contest
the proposed adjustment either before or after payment of the tax asserted to be
payable, provided that CCL shall not settle, compromise or otherwise concede any
such contested adjustment or asserted deficiency without the consent of Corning,
which consent shall not be unreasonably withheld. If CCL pays a disputed amount
of Taxes resulting from a disallowed Corning Deduction arising from an amount
indemnified against by Corning under Section 3.01(b) or Section 3.01(c), and
brings suit for refund, Corning shall advance the disputed amount of Taxes (but
only to the extent of the portion of such disputed Taxes as is attributable to
the disallowance of such Corning Deduction) to CCL within 15 business days of
such payment by CCL. If CCL subsequently receives a refund or credit, of all or
a part of the amount of disputed Taxes advanced by Corning, CCL shall promptly
pay (and in any event within 15 business days) to Corning an amount equal to the
portion of such refund or credit attributable to a Corning Deduction together
with any interest received (including by offset) by CCL from the Taxing
authority with respect to such portion. With respect to matters arising
hereunder controlled by Corning, and where deemed necessary by Corning, CCL
shall itself, and shall compel any


<PAGE>


                                       21

CCL Subsidiary to, authorize by appropriate powers of attorney such persons as
Corning shall designate to represent CCL, or such CCL Subsidiary, with respect
to such matters.

                  (ix) If Corning and CCL are unable to agree on the proper
calculation or treatment of a payment or other obligation, a Tax deduction or
Tax Benefit Item or any other item described in this Section 3.01(d), then such
disputed item or items shall be resolved by a nationally recognized accounting
or law firm chosen and mutually acceptable to both parties. Such accounting or
law firm shall resolve the dispute within 30 days of having the item or items
referred to it and such resolution shall be binding on the parties. The costs,
fees and expenses of the accounting or law firm shall be borne equally by
Corning and CCL. In the event the parties are not able to agree on an accounting
or law firm, each party shall select its own nationally recognized law firm (and
bear the costs, fees and expenses thereof) and such law firms shall select a
nationally recognized accounting or law firm which accounting or law firm shall
be deemed to be mutually acceptable to both parties for the purpose of applying
this provision. Nothing in this Section 3.01(d) shall require either party to
take any position on a Tax return or for Tax purposes for which there is no
reasonable basis.

                  (x) All payments under Sections 3.01(b), 3.01(c) and 3.01(d)
shall be made without gross-up for Taxes, except if (A) the Tax liability of
Corning or a consolidated or combined group which has Corning as a member and
which does not have CCL as a member (the "Corning Group") is actually reduced by
a Tax deduction attributable to the payment by Corning of an amount indemnified
against by Corning under Sections 3.01(b) or 3.01(c) in any tax year that ends
after the Distribution Date because such payment is properly treated as an
deduction against ordinary income for Corning or the Corning Group in computing
its Taxable income for such year (a "CCL Payment Deduction") and (B) the Tax
Liability of any CCL Company or the CCL Group for such year is actually
increased by such payment because such payment is properly treated as an item of
ordinary income for any CCL Company or the CCL Group, then Corning shall pay to
CCL an amount equal to the lesser of the amount of such Corning Tax reduction
and the amount of such CCL Tax increase, within 15 business days after the
parties agree on the amount of the Corning Tax reduction and CCL Tax increase,
provided, however, any payment by Corning to CCL shall be net of Taxes imposed
on Corning or the Corning Group in respect of amounts paid by CCL to Corning
under Section 3.01(d). For purposes of computing a Corning Tax increase, it
shall be assumed that all losses and deductions other than the CCL Payment
Deduction are applied to reduce the Tax Liability of Corning or the Corning
Group before the CCL Payment Deduction is so applied.

                  (e) Notwithstanding anything to the contrary in this
agreement, Corning shall not indemnify, defend or hold harmless CCL or any
Subsidiary of CCL against (x) costs and expenses relating to the investigations
or claims referred to in Sections 3.01(b) and (c) (including, without
limitation, fees and expenses of attorneys, consultants and other agents of CCL
or any Subsidiary of CCL), or (y) losses of revenues or profits that may arise
as a consequence of the claims or investigations referred to in Sections 3.01(b)
or 3.01(c) or the



<PAGE>


                                       22

settlements entered into or judgments rendered as a result thereof or as a
consequence of any exclusion from participation in any federal or state health
care program, or (z) any other consequential or incidental damages that may be
incurred by CCL or any Subsidiary of CCL, in each case which relates to the
billing of any person or any beneficiary of such person by CCL, any Subsidiary
of CCL or any past or present subsidiary of CLSI (or any of their predecessors)
for services provided to any such person or beneficiary thereof by CCL, any
Subsidiary of CCL or any past or present subsidiary of CLSI (or any of their
predecessors).

                  (f) All indemnification obligations of Corning pursuant to
this Section 3.01 may be made or assumed by an Affiliate of Corning to the
extent deemed necessary or desirable by Corning in its sole discretion;
provided, however, that Corning shall remain liable for such obligations.

                  SECTION 3.02. Indemnification by CCL. Except as otherwise
specifically set forth in any provision of this Agreement or of any Ancillary
Agreement, CCL shall indemnify and hold harmless the Corning Indemnitees and the
Covance Indemnitees from and against any and all Indemnifiable Losses of the
Corning Indemnitees and the Covance Indemnitees, respectively, arising out of,
by reason of or otherwise in connection with (i) the CCL Liabilities or (ii) the
breach by CCL of any provision of this Agreement or any Ancillary Agreement;
provided, however, that CCL is under no obligation to indemnify or hold harmless
Corning from and against any Indemnifiable Losses arising out of, or by reason
of or otherwise in connection with any and all monetary payments by Corning in
respect of (i) the investigations or claims referred to in Section 3.01(b) or
(ii) claims referred to in Section 3.01(c) as to which no CCL Indemnitee is a
party.

                  SECTION 3.03. Indemnification by Covance. Except as otherwise
specifically set forth in any provision of this Agreement or of any Ancillary
Agreement, Covance shall indemnify and hold harmless the Corning Indemnitees and
the CCL Indemnitees from and against any and all Indemnifiable Losses of the
Corning Indemnities and the CCL Indemnitees, respectively, arising out of, by
reason of or otherwise in connection with (i) the Covance Liabilities or (ii)
the breach by Covance of any provision of this Agreement or any Ancillary
Agreement.

                  SECTION 3.04. Adjustments for Indemnification Obligations. If
the amount that any party (an "Indemnifying Party") is or may be required to pay
to any other person (an "Indemnitee") pursuant to Section 3.01, Section 3.02 or
Section 3.03, as applicable, shall, at any time subsequent to the payment
required by this Agreement, be reduced by insurance or other recovery,
settlement or otherwise, the amount of such reduction, less any expenses
incurred in connection therewith, shall promptly be repaid by the Indemnitee to
the Indemnifying Party, up to the aggregate amount of any payments received from
such Indemnifying Party pursuant to this Agreement in respect of such
Indemnifiable Loss.




<PAGE>


                                       23

                  SECTION 3.05. Procedures for Indemnification - Third Party
Claims. If a claim or demand is made against an Indemnitee by any person who is
not a party to this Agreement (a "Third Party Claim") as to which such
Indemnitee is entitled to indemnification pursuant to this Agreement, such
Indemnitee shall notify the Indemnifying Party in writing, and in reasonable
detail, of the Third Party Claim promptly (and in any event within 15 business
days) after receipt by such Indemnitee of written notice of the Third Party
Claim; provided, however, that failure to give such notification shall not
affect the indemnification provided hereunder except to the extent the
Indemnifying Party shall have been actually prejudiced as a result of such
failure (except that the Indemnifying Party shall not be liable for any expenses
incurred during the period in which the Indemnitee failed to give such notice).

                  If a Third Party Claim is made against an Indemnitee, the
Indemnifying Party shall be entitled to participate in the defense thereof and,
in the case of an Indemnifying Party's obligation to indemnify the Indemnitee
pursuant to Section 3.01(a), Section 3.01(b), Section 3.02 or Section 3.03, if
the Indemnifying Party so chooses and acknowledges in writing its obligation to
indemnify the Indemnitee therefor, to assume the defense thereof with counsel
selected by the Indemnifying Party; provided, however, that such counsel is not
reasonably objected to by the Indemnitee. Should the Indemnifying Party so elect
to assume the defense of a Third Party Claim, the Indemnifying Party shall not
be liable to the Indemnitee for legal or other expenses subsequently incurred by
the Indemnitee in connection with the defense thereof. If the Indemnifying Party
assumes such defense, the Indemnitee shall have the right to participate in the
defense thereof and to employ counsel, at its own expense, separate from the
counsel employed by the Indemnifying Party, it being understood that the
Indemnifying Party shall control such defense. The Indemnifying Party shall be
liable for the fees and expenses of counsel employed by the Indemnitee for any
period during which the Indemnifying Party has failed to assume the defense
thereof. If the Indemnifying Party so elects to assume the defense of any Third
Party Claim, all of the Indemnitees shall cooperate with the Indemnifying Party
in the defense or prosecution thereof.

                  If the Indemnifying Party acknowledges in writing liability
for a Third Party Claim, then in no event will the Indemnitee admit any
liability with respect to, or settle, compromise or discharge, any Third Party
Claim without the Indemnifying Party's prior written consent, which consent
shall not be unreasonably withheld or delayed; provided, however, that the
Indemnitee shall have the right to settle, compromise or discharge such Third
Party Claim without the consent of the Indemnifying Party if the Indemnitee
releases the Indemnifying Party from its indemnification obligation hereunder
with respect to such Third Party Claim and such settlement, compromise or
discharge would not otherwise adversely affect the Indemnifying Party. If the
Indemnifying Party acknowledges in writing liability for a Third Party Claim,
the Indemnitee will agree to any settlement, compromise or discharge of a Third
Party Claim that the Indemnifying Party may recommend which by its terms (i)
obligates the Indemnifying Party to pay the full amount of its indemnification
obligation in connection with such Third Party Claim and (ii) releases the
Indemnitee completely in



<PAGE>


                                       24

connection with such Third Party Claim and which would not otherwise adversely
affect the Indemnitee; and provided further that the Indemnitee may refuse to
agree to any such proposed settlement, compromise or discharge if the Indemnitee
agrees that the Indemnifying Party's indemnification obligation with respect to
such Third Party Claim shall not exceed the amount that would be required to be
paid by or on behalf of the Indemnifying Party in connection with such proposed
settlement, compromise or discharge.

                  Notwithstanding the foregoing, the Indemnifying Party shall
not be entitled to assume the defense of any Third Party Claim (and shall be
liable for the fees and expenses of counsel incurred by the Indemnitee in
defending such Third Party Claim) if the Third Party Claim seeks an order,
injunction or other equitable relief or relief for other than money damages
against the Indemnitee which the Indemnitee reasonably determines, after
conferring with its counsel, cannot be separated from any related claim for
money damages. If such equitable relief or other relief portion of the Third
Party Claim can be so separated from that for money damages, the Indemnifying
Party shall be entitled to assume the defense of the portion relating to money
damages.

                  The provisions contained in Section 3.01(d) shall control in
the situations described particularly in that section.

                  SECTION 3.06. Survival of Indemnities. The obligations of
Corning, CCL and Covance under this Article III shall survive the sale or other
transfer by any of them of any assets or businesses, with respect to any
Indemnifiable Loss of any Indemnitee related to such assets or businesses.

                  SECTION 3.07.  Payments.  All payments under this Agreement 
shall be made without gross-up for Taxes except as provided in Section
3.01(d)(x).

                                   ARTICLE IV
                              ACCESS TO INFORMATION

                  SECTION 4.01. Provision of Corporate Records. From and after
the Distribution Date, upon the prior written request by Corning, CCL or Covance
for specific and identified agreements, documents, books, records or files
(collectively, "Records") relating to or affecting Corning, CCL or Covance, as
applicable, Corning, CCL or Covance, as the case may be, shall arrange, as soon
as reasonably practicable following the receipt of such request, for the
provision of appropriate copies of such Records (or other originals thereof if
the party making the request has a reasonable need for such originals) then in
the possession of Corning, CCL or Covance, as the case may be, or any of their
Subsidiaries, but only to the extent such items are not already in the
possession of the requesting party; provided, however, that nothing in this
Section 4.01 shall obligate a party to retain any records except to the extent
required by



<PAGE>


                                       25

law or by an Ancillary Agreement or to provide Records if the party reasonably
determines that such provision of Records would prevent it from claiming that
the Records were privileged or otherwise not subject to disclosure in any
Action.

                  SECTION 4.02. Access to Information. (a) From and after the
Distribution Date, each of Corning, CCL and Covance shall afford to the other
and its authorized accountants, counsel and other designated representatives
reasonable access during normal business hours, subject to appropriate
restrictions for classified, privileged or confidential information, to the
personnel, properties, books and records of such party and its Subsidiaries
insofar as such access is reasonably required by the other party.

                  (b) For a period of five years following the Distribution
Date, each of Corning, CCL and Covance shall provide to the other, promptly
following such time at which such documents shall be filed with the Commission,
all documents that shall be filed by it and by any of its respective
Subsidiaries with the Commission pursuant to the periodic and interim reporting
requirements of the Exchange Act, and the rules and regulations of the
Commission promulgated thereunder.

                  SECTION 4.03. Reimbursement. Except to the extent otherwise
contemplated by any Ancillary Agreement, a party providing Records or access to
information to the other party under this Article IV shall be entitled to
receive from the recipient, upon the presentation of invoices therefor, payments
for such amounts, relating to supplies, disbursement and other out-of-pocket
expenses, as may be reasonably incurred in providing such Records or access to
information.

                  SECTION 4.04. Confidentiality. (a) Each of (i) Corning and its
Subsidiaries, (ii) CCL and its Subsidiaries and (iii) Covance and its
Subsidiaries shall not use or permit the use of (without the prior written
consent of the other) and shall hold, and shall cause its directors, officers,
employees, agents, consultants and advisors to hold, in strict confidence, all
information concerning the other parties in its possession, its custody or under
its control (except to the extent that (x) such information has been in the
public domain through no fault of such party, (y) such information has been
later lawfully acquired from other sources by such party or (z) this Agreement,
any Ancillary Agreement or any other agreement entered into pursuant hereto
permits the use or disclosure of such information) to the extent such
information (i) was obtained prior to or relates to periods prior to the
Effective Time, (ii) relates to any Ancillary Agreement or (iii) is obtained in
the course of performing services for the other party pursuant to any Ancillary
Agreement, and each party shall not (without the prior written consent of the
other) otherwise release or disclose such information to any other person,
except such party's auditors and attorneys, unless compelled to disclose such
information by judicial or administrative process or unless such disclosure is
required by law and such party has used commercially reasonable efforts to
consult with the other affected party or parties prior to such disclosure.



<PAGE>


                                       26

                  (b) To the extent that a party hereto is compelled by judicial
or administrative process to disclose otherwise confidential information under
circumstances in which any evidentiary privilege would be available, such party
agrees to assert such privilege in good faith prior to making such disclosure.
Each of the parties hereto agrees to consult with each relevant other party in
connection with any such judicial or administrative process, including, without
limitation, in determining whether any privilege is available, and further
agrees to allow each such relevant party and its counsel to participate in any
hearing or other proceeding (including, without limitations, any appeal of an
initial order to disclose) in respect of such disclosure and assertion of
privilege.


                                    ARTICLE V
                               DISPUTE RESOLUTION

                  SECTION 5.01. Good Faith Negotiations. In the event of a
controversy, dispute or claim arising out of, in connection with, or in relation
to the interpretation, performance, nonperformance, validity or breach of this
Agreement or otherwise arising out of, or in any way related to this Agreement,
including, without limitation, any claim based on contract, tort or statute
(collectively, "Agreement Disputes"), the general counsels of the relevant
parties shall negotiate in good faith for a reasonable period of time to settle
such Agreement Dispute.

                  SECTION 5.02. Procedure. If after such reasonable period such
general counsels are unable to settle such Agreement Dispute (and in any event
after 60 days have elapsed from the time the relevant parties began such
negotiations), such Agreement Dispute shall be determined, at the request of any
relevant party, by arbitration conducted in New York City, before and in
accordance with the then-existing Rules for Commercial Arbitration of the
American Arbitration Association (the "Rules"), and any judgment or award
rendered by the arbitrator shall be final, binding and nonappealable (except
upon grounds specified in 9 U.S.C. ss. 10(a) as in effect on the date hereof),
and judgment may be entered by any state or federal court having jurisdiction
thereof in accordance with Section 6.16 hereof. Unless the arbitrator otherwise
determines, the pre-trial discovery of the then-existing Federal Rules of Civil
Procedure and the then-existing Rules 46 and 47 of the Civil Rules for the
United States District Court for the Southern District of New York shall apply
to any arbitration hereunder. Any controversy concerning whether an Agreement
Dispute is an arbitrable Agreement Dispute, whether arbitration has been waived,
whether an assignee of this Agreement is bound to arbitrate, or as to the
interpretation of enforceability of this Article V shall be determined by the
arbitrator. The arbitrator shall be a retired or former judge of any United
States District Court or Court of Appeals or such other qualified person as the
relevant parties may agree to designate, provided, however, such individual has
had substantial professional experience with regard to settling sophisticated
commercial disputes. The parties intend that the provisions to arbitrate set
forth herein be valid, enforceable and irrevocable. The designation of a situs
or a



<PAGE>


                                       27

governing law for this Agreement or the arbitration shall not be deemed an
election to preclude application of the Federal Arbitration Act, if it would be
applicable. In his or her award the arbitrator shall allocate, in his or her
discretion, among the parties to the arbitration all costs of the arbitration,
including, without limitation, the fees and expenses of the arbitrator and
reasonable attorneys' fees, costs and expert witness expenses of the parties.
The undersigned agree to comply with any award made in any such arbitration
proceedings that has become final in accordance with the Rules and agree to the
entry of a judgment in any jurisdiction upon any award rendered in such
proceedings becoming final under the Rules. The arbitrator shall be entitled if
appropriate, to award any remedy in such proceedings, including, without
limitation, monetary damages, specific performance and all other forms of legal
and equitable relief; provided, however, the arbitrator shall not be entitled to
award punitive damages.


                                   ARTICLE VI
                               GENERAL PROVISIONS

                  SECTION 6.01. Expenses. Except as otherwise set forth in this
Agreement or any Ancillary Agreement, each of Corning, CCL and Covance shall
bear its own costs and expenses incurred on or prior to the Distribution Date
(whether or not paid on or prior to the Distribution Date) in connection with
the preparation, execution, delivery and implementation of this Agreement and
any Ancillary Agreement, the Information Statement, the Registration Statements
and the Distributions and the consummation of the transactions contemplated
thereby and the parties to this Agreement shall agree on an equitable allocation
of costs and expenses where any item is not clearly allocable to Corning, CCL or
Covance. Except as otherwise set forth in this Agreement or any Ancillary
Agreement, each party shall bear its own costs and expenses incurred after the
Distribution Date.

                  SECTION 6.02.  Notices.  All notices, requests, claims,
demands and other communications hereunder shall be in writing and shall be
given or made (and shall be deemed to have been duly given or made upon receipt)
by delivery in person, by courier service, by cable, by telecopy, by telegram,
by telex or by registered or certified mail (postage prepaid, return receipt
requested) to the respective parties at the addresses (or at such other address
for a party as shall be specified in a notice given in accordance with this
Section 6.02) listed below (with copies to Shearman & Sterling at 599 Lexington
Avenue, New York, New York 10022, Attn: Creighton Condon):



<PAGE>


                                       28

         (a)      To Corning Incorporated:

                  One Riverfront Plaza
                  Corning, New York  14831
                  Telecopy:  (607) 974-8656

                  Attn:  General Counsel

         (b)      To CCL:

                  One Malcolm Avenue
                  Teterboro, New Jersey  07608
                  Telecopy:  (201) 462-4795

                  Attn:  General Counsel

         (c)      To Covance:

                  210 Carnegie Center
                  Princeton, New Jersey  08540-6233
                  Telecopy:  (609) 452-9865

                  Attn:  General Counsel

                  SECTION 6.03. Complete Agreement; Construction. This
Agreement, including the Exhibits and Schedules, and the Ancillary Agreements
shall constitute the entire agreement between the parties hereto with respect to
the subject matter hereof and shall supersede all prior agreements and
undertakings, both written and oral, between the parties with respect to the
subject matter hereof and thereof. In the event of any inconsistency between
this Agreement and any Schedule hereto, the Schedule shall prevail.
Notwithstanding any other provisions in this Agreement to the contrary, in the
event and to the extent that there shall be a conflict between the provisions of
this Agreement and the provisions of any Ancillary Agreement, such Ancillary
Agreement shall control.

                  SECTION 6.04.  Ancillary Agreements.  This Agreement is not 
intended to address, and should not be interpreted to address, the matters
specifically and expressly covered by the Ancillary Agreements.

                  SECTION 6.05. Counterparts. This Agreement may be executed in
one or more counterparts, and by the different parties hereto in separate
counterparts, each of which when executed shall be deemed to be an original but
all of which taken together shall constitute one and the same agreement.



<PAGE>


                                       29

                  SECTION 6.06. Survival of Agreements. Except as otherwise
contemplated by this Agreement, all covenants and agreements of the parties
contained in this Agreement shall survive the Distribution Date.

                  SECTION 6.07. Waiver. The parties to this Agreement may (a)
extend the time for the performance of any of the obligations or other acts of
the other party or parties, (b) waive any inaccuracies in the representations
and warranties of the other party or parties contained herein or in any document
delivered by the other party or parties pursuant hereto or (c) waive compliance
with any of the agreements or conditions of the other party or parties contained
herein. Any such extension or waiver shall be valid only if set forth in an
instrument in writing signed by the party to be bound thereby. Any waiver of any
term or condition shall not be construed as a waiver of any subsequent breach or
a subsequent waiver of the same term or condition, or a waiver of any other term
or condition, of this Agreement. The failure of any party to assert any of its
rights hereunder shall not constitute a waiver of any such rights.

                  SECTION 6.08. Amendments. Subject to the terms of Section 6.11
hereof, this Agreement may not be amended or modified except (a) by an
instrument in writing signed by, or on behalf of, the parties or (b) by a waiver
in accordance with Section 6.07.

                  SECTION 6.09. Assignment. This Agreement may not be assigned
by operation of law or otherwise without the express written consent of the
other parties (which consent may be granted or withheld in the sole discretion
of the parties), and any attempt to assign any rights or obligations arising
under this Agreement without such consent shall be void.

                  SECTION 6.10. Successors and Assigns. The provisions of this
Agreement shall be binding upon, inure to the benefit of and be enforceable by
the parties and their respective successors and permitted assigns.

                  SECTION 6.11. Termination. This Agreement (including, without
limitation, Article III hereof) may be terminated and the Distributions may be
amended, modified or abandoned at any time prior to the Distributions by and in
the sole discretion of Corning without the approval of CCL or Covance or the
shareholders of Corning. In the event of such termination, no party shall have
any liability of any kind to any other party or any other person. After the
Distributions, this Agreement may not be terminated except by an agreement in
writing signed by the parties; provided, however, that Article III shall not be
terminated or amended after the Distributions in respect of the third party
beneficiaries thereto without the consent of such persons.

                  SECTION 6.12.  Subsidiaries.  Each of the parties hereto 
shall cause to be performed, and hereby guarantees the performance of, all
actions, agreements and obligations



<PAGE>


                                       30

set forth herein to be performed by any Subsidiary of such party or by any
entity that is contemplated to be a Subsidiary of such party on and after the
Distribution Date.

                  SECTION 6.13. Third Party Beneficiaries. Except as provided in
Article III relating to Indemnitees, this Agreement shall be binding upon and
inure solely to the benefit of the parties hereto and their respective
Subsidiaries, Affiliates and assigns and nothing herein, express or implied, is
intended to or shall confer upon any third parties any legal or equitable right,
benefit or remedy of any nature whatsoever under or by reason of this Agreement.

                  SECTION 6.14. Headings. The descriptive headings contained 
in this Agreement are for convenience of reference only and shall not affect in
any way the meaning or interpretation of this Agreement.

                  SECTION 6.15. Specific Performance. The parties hereto agree
that irreparable damage would occur in the event any provision of this Agreement
was not performed in accordance with the terms hereof and that the parties shall
be entitled to specific performance of the terms hereof, in addition to any
other remedy at law or equity.

                  SECTION 6.16. Governing Law. This Agreement shall be governed
by, and construed in accordance with, the laws of the State of New York,
applicable to contracts executed in and to be performed entirely within that
state. Without limiting the provisions of Article V, all actions and proceedings
arising out of or relating to this Agreement shall be heard and determined in
any New York state or federal court sitting in the City of New York.

                  SECTION 6.17. Public Announcements. (a) Prior to the Effective
Time, neither CCL nor Covance shall make, or cause to be made, any press release
or public announcement in respect of this Agreement or the transactions
contemplated hereby or otherwise communicate with any news media without the
prior written consent of Corning.

                  (b) Following the Effective Time, no party to this Agreement
shall make, or cause to be made, any press release or public announcement in
respect of this Agreement or the transactions contemplated hereby or otherwise
communicate with any news media without prior consultation with the other
parties, and the parties shall cooperate as to the timing and contents of any
such press release or public announcement.

                  SECTION 6.18. Severability. If any term or other provision of
this Agreement is invalid, illegal or incapable of being enforced by any law or
public policy, all other terms and provisions of this Agreement shall
nevertheless remain in full force and effect so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely



<PAGE>


                                       31

as possible in an acceptable manner in order that the transactions contemplated
hereby are consummated as originally contemplated to the greatest extent
possible.

                  IN WITNESS WHEREOF, the parties have caused this Agreement to
be executed as of the date first written above by their respective officers
thereunto duly authorized.


                                            CORNING INCORPORATED


                                             by /s/ A. John Peck, Jr.
                                                ---------------------
                                               Name:
                                               Title:


                                            CORNING LIFE SCIENCES INC.


                                             by /s/ Leo C. Farrenkopf, Jr.
                                                --------------------------
                                                Name:
                                                Title:


                                            CORNING CLINICAL LABORATORIES INC.
                                            (Delaware)


                                            by /s/ Robert A. Carothers
                                               -----------------------
                                              Name:
                                              Title:


                                            COVANCE INC.


                                            by /s/ Jeffrey S. Hurwitz
                                               ----------------------
                                               Name:
                                               Title:



                                            CORNING CLINICAL LABORATORIES INC.
                                            (Michigan)


                                            by /s/ A.W. Reynolds
                                               -----------------
                                               Name:
                                               Title:




<PAGE>


                                       32







                              TAX SHARING AGREEMENT

         This TAX SHARING AGREEMENT (this "Agreement") is dated as of
December 16, 1996, by and among CORNING INCORPORATED, a New York corporation
("Corning"), CORNING CLINICAL LABORATORIES INC., a Delaware corporation ("CCL"),
and COVANCE INC., a Delaware corporation ("Covance").

                               W I T N E S S E T H
                  WHEREAS, Corning is the common parent of an affiliated group
of corporations which includes CCL and Covance and which group and the members
thereof file consolidated federal income tax returns as well as certain
consolidated, combined or unitary state tax returns;

                  WHEREAS, the Board of Directors of Corning has determined that
it is appropriate and desirable to effect the Distributions as defined in and
pursuant to a Transaction Agreement dated as of even date herewith between
Corning, Corning Life Sciences Inc., a Delaware corporation ("CLSI"), CCL, and
Covance (the "Transaction Agreement"), subject to the satisfaction or waiver of 
the conditions set forth in the Transaction Agreement; and

                  WHEREAS, the parties hereto desire to set forth their
agreements with regard to their respective liabilities for federal, state, local
and foreign taxes for periods before and after the Distributions and to provide
for certain other tax matters.

                  NOW, THEREFORE, in consideration of the mutual agreements,
provisions and covenants contained in this Agreement, the parties hereby agree
as follows:

                                    ARTICLE 1
                                   DEFINITIONS

         SECTION 1.01. General. As used in this Agreement, the following terms
shall have the following meanings (such meanings to be equally applicable to
both the singular and plural forms of the terms defined):

<PAGE>

         "Affiliate" shall mean, when used with respect to a specified person,
another person that directly, or indirectly through one or more intermediaries,
will control, or will be controlled by or will be under common control with the
person specified immediately following the Distribution Date.

         "Agreement"  shall have the meaning described in the above preamble.

         "Carryback Item"  shall have the meaning as described in Section
5.01(b) below.

         "CCL"  shall have the meaning as described in the preamble to this
Agreement.

         "CCL Companies" shall mean, collectively, CCL and each Subsidiary of
CCL, other than Covance and any Subsidiary of Covance.

         "CCL Distribution" shall mean the distribution by Corning to the
Corning shareholders of the stock of CCL as more particularly described in the
Transaction Agreement.

         "CCL Domestic Companies" shall mean, collectively, each CCL Company
incorporated or organized under the laws of one of the respective States of the
United States.

         "CCL Group" shall mean the affiliated group of corporations as defined
in Section 1504(a) of the Code of which CCL is the common parent, not including
Covance or any member of the Covance Group and determined as if the capital 
stock of CCL is widely held.

         "CCL Returns"  shall have the meaning as described in Section 2.03
below.

         "CCL Return Period" shall mean a taxable period to which this Agreement
applies and for which a CCL Return is filed.

         "CCL Separate Liability" shall have the meaning as described in
Section 4.01.

         "CI Consolidated Return" shall mean any consolidated federal income tax
return or amendment thereof of the CI Group which includes one or more of the
CCL Domestic Companies or the Covance Domestic Companies.

         "CI Consolidated Return Period" shall mean a taxable period to which
this Agreement applies and for which a CI Consolidated Return is filed.

         "CI Group" shall mean the affiliated group of corporations as defined
in Section 1504(a) of the Code of which Corning is the common parent.

                                       2

<PAGE>

         "CI Group Benefit Amount" shall have the meaning as described in
Section 4.04(b) hereof.

         "CI State, Local and Foreign Returns" shall have the meaning as
described in Section 2.02 below.

         "CI State, Local and Foreign Return Period" shall mean a taxable period
to which this Agreement applies and for which a CI State, Local and Foreign
Return is filed.

         "Code"  shall mean the Internal Revenue Code of 1986, as amended.

         "Corning"  shall have the meaning as described in the preamble to this
Agreement.

         "Corning Subsidiary" shall mean any subsidiary of Corning other than
any of the Covance Companies and the CCL Companies.

         "Covance"  shall have the meaning as described in the preamble to this
Agreement.

         "Covance Companies"  shall mean, collectively, Covance and each 
Subsidiary of Covance.

         "Covance Distribution" shall mean the distribution by CCL to the CCL
shareholders of the stock of Covance as more particularly described in the
Transaction Agreement.

         "Covance Domestic Companies" shall mean, collectively, each Covance
Company incorporated or organized under the laws of one of the respective States
of the United States. "Covance Group" shall mean the affiliated group of
corporations as defined in Section 1504(a) of the Code of which Covance is the
common parent and determined as if the capital stock of Covance is widely held.

         "Covance Returns"  shall have the meaning as described in Section 2.04
below.

         "Covance Return Period" shall mean a taxable period to which this
Agreement applies and for which a Covance Return is filed.

         "Covance Separate Liability" shall have the meaning as described in
Section 4.01 below.

         "Distributions" shall mean the CCL Distribution, the Covance
Distribution and any transfers relating to the CCL Distribution or the Covance
Distribution.

         "Distribution Date" shall have the meaning as described in the
Transaction Agreement.

         "IRS" shall mean the Internal Revenue Service.

         "IRS Penalty Rate" small mean the rate of interest imposed from time to
time on underpayments of income tax pursuant to Code section 6621.

                                       3

<PAGE>

         "IRS Ruling" shall mean the ruling issued by the IRS which states the
tax treatment of the Distributions and related transactions.

         "person" shall mean any natural person, corporation, business trust,
joint venture, association, company, partnership or government, or any agency or
political subdivision thereof.

         "Separate Covance/CCL Liability" shall have the meaning as described in
Section 4.02 below.

         "Separate Returns" shall have the meaning as described in Section 2.04
below.

         "Spin-Off Tax Indemnification Agreements" shall mean the Spin-Off Tax
Indemnification Agreements dated of even date herewith between or among two or
more of Corning, CCL and Covance.

         "Subsidiary" shall have the meaning as described in the Transaction
Agreement.

         "Tax" or "Taxes" shall mean all federal, state, local and foreign gross
or net income, gross receipts, withholding, franchise, transfer, estimated or
other tax or similar charges and assessments, including all interest, penalties
and additions imposed with respect to such amounts.

         "Temporary Differences" attributable to any entity shall mean (a) any
single item of income or deduction in a CI Consolidated Return in respect of any
tax period that should reverse in one or more subsequent tax periods assuming
proper tax treatment and no change in law or in the tax accounting policies of
such entity (each an "Originating Temporary Difference") or (b) the partial or
complete reversal of an Originating Temporary Difference.

         "Transaction Agreement" shall have the meaning as described on page 1
of this Agreement.

         SECTION 1.02. CLSI. For all tax periods ending before or on the
Distribution Date, references herein to CCL shall include CLSI, which will be
merged into CCL prior to the Distribution Date pursuant to the Transaction
Agreement.

                                       4

<PAGE>

                                    ARTICLE 2
                                TAX RETURN FILING

         SECTION 2.01. CI Consolidated Returns. Corning shall prepare and file
with the IRS all CI Consolidated Returns and amendments thereto required to be
filed by the CI Group for all tax periods beginning before or on the
Distribution Date. Such returns shall include all income, gains, losses,
deductions and credits of the CCL Domestic Companies and the Covance Domestic
Companies. Corning shall make all decisions relating to the preparation and
filing of such returns, subject to the approval of CCL and Covance, which
approval shall not be withheld unless no reasonable basis exists for the
decisions made by Corning in respect of such return. CCL and Covance further
agree to, and respectively agree to compel the CCL Domestic Companies and the
Covance Domestic Companies to, file or join in the filing of such
authorizations, elections, consents and other documents, and take such other
actions as may be necessary or appropriate, in the opinion of Corning, to carry
out the purposes and intent of this Section 2.01, provided that such actions are
not inconsistent with this Agreement or the Spin-Off Tax Indemnification
Agreements. CCL and Covance each shall furnish Corning at least sixty (60) days
before the due date (including extensions) of any such CI Consolidated Return
with its completed section of such CI Consolidated Return, prepared in
accordance with this Agreement, in accordance with instructions from Corning and
in a manner consistent with prior returns, except to the extent otherwise
required by the Spin-Off Tax Indemnification Agreements. CCL and Covance each
shall also furnish Corning work papers and other such information and
documentation as is reasonably requested by Corning with respect to the CCL
Companies and the Covance Companies. At Corning's request, major items of
income, deduction, gain and loss selected by Corning for inclusion in the CI
Consolidated Returns and relating to CCL Domestic Companies and Covance Domestic
Companies shall have been reviewed and approved prior to submission to Corning
by a nationally recognized accounting firm or law firm with expertise sufficient
to address the issues presented mutually acceptable to Corning and the party or
parties submitting such information. Corning and the other party or parties
submitting such information shall each pay an equal share of the cost of such
review.

                                       5

<PAGE>

         SECTION 2.02. CI State, Local and Foreign Returns. For any taxable
period beginning before or on the Distribution Date, Corning will prepare and
file all combined, consolidated or unitary state, local or foreign income or
franchise tax returns which are required to be filed by Corning or a Corning
Subsidiary and which include the operations conducted before or as of the
Distribution Date by (i) any of the CCL Companies or the Covance Companies, and
(ii) Corning or any Corning Subsidiary (herein, together with such returns filed
for previous periods, "CI State, Local and Foreign Returns"). Corning will
timely advise CCL and Covance of the inclusion of any of the CCL Companies and
the Covance Companies in any CI State, Local and Foreign Returns and the
jurisdictions in which such returns will be filed, which inclusion will not be
inconsistent with prior CI State, Local and Foreign Returns unless required by
applicable law. CCL and Covance will, and respectively will compel each of the
CCL Companies and Covance Companies whose tax information is included in any CI
State, Local and Foreign Return to, evidence its agreement to be included in
such return on the appropriate form and take such other action as may be
appropriate, in the opinion of Corning, to carry out the purposes and intent of
this Section 2.02, provided that such actions are not inconsistent with this
Agreement or the Spin-Off Tax Indemnification Agreements. CCL and Covance each
shall furnish Corning at least sixty (60) days before the due date (including
extensions) of any such CI State, Local and Foreign Return with a final copy of
the information necessary for Corning to complete such CI State, Local and
Foreign Return, prepared in accordance with instructions from Corning and in a
manner consistent with prior returns, except to the extent otherwise required by
the Spin-Off Tax Indemnification Agreements. CCL and Covance each shall also
furnish Corning work papers and other such information and documentation as is
reasonably requested by Corning.

         2.03 CCL Returns. For any taxable period beginning before or on the
Distribution Date, CCL will prepare and file all combined, consolidated or
unitary state, local or foreign income or franchise tax returns which are
required to be filed separately by CCL or any Subsidiary of CCL, and which
include the operations conducted before or as of the

                                       6

<PAGE>

         Distribution Date by any of the CCL Companies and any of the Covance
Companies (herein, together with such returns filed for previous periods, "CCL
Returns"). CCL will timely advise Covance of the inclusion of any of the Covance
Companies in any CCL Returns and the jurisdictions in which such returns will be
filed, which inclusion will not be inconsistent with prior CCL Returns unless
required by applicable law. Covance will, and will compel each of the Covance
Companies whose tax information is included in any CCL Return to, evidence its
agreement to be included in such return on the appropriate form and take such
other action as may be appropriate, in the opinion of CCL, to carry out the
purposes and intent of this Section 2.03, provided that such actions are not
inconsistent with this Agreement or the Spin-Off Tax Indemnification Agreements.
Covance shall furnish CCL at least sixty (60) days before any CCL Return is due
(with extensions) with a final copy of the information necessary for CCL to
complete such CCL Return, prepared in accordance with instructions from CCL and
in a manner consistent with prior returns, except to the extent otherwise
required by the Spin-Off Tax Indemnification Agreements. Covance shall also
furnish CCL work papers and other such information and documentation as is
requested by CCL.

         2.04 Separate Returns. For any taxable period ending before, on or
after the Distribution Date, each of Corning, CCL and Covance will prepare and
file all respective separate combined, consolidated or unitary state, local or
foreign income or franchise tax returns which are required to be filed
separately by such party and not otherwise described in Section 2.01, 2.02 or
2.03 above (herein, together with such returns filed for previous periods,
"Separate Returns").

                                    ARTICLE 3
                                  TAX LIABILITY

         SECTION 3.01. Corning Liability. Except to the extent otherwise
provided herein and in the Spin-Off Tax Indemnification Agreements, for each CI
Consolidated Return Period and each CI State, Local and Foreign Return Period,
Corning shall be liable for and indemnify

                                       7

<PAGE>

CCL and Covance against all taxes due in respect of all CI Consolidated Returns
and all CI State, Local and Foreign Returns, subject to reimbursement from CCL
and Covance respectively as contemplated by Article 4.

         SECTION 3.02. State, local and foreign and separate return liability.
Except to the extent otherwise provided herein and in the Spin-Off Tax
Indemnification Agreements, (a) Corning will pay all taxes due on CI State,
Local and Foreign Returns, subject to appropriate reimbursement by CCL and
Covance respectively for liabilities for state, local and foreign returns as
contemplated by Article 4; (b) CCL will pay all taxes due on returns required to
be filed by CCL by Sections 2.03 and 2.04 hereof, subject to appropriate
reimbursement by Covance as contemplated by Article 4; and (c) Covance will pay
all taxes due on returns required to be filed by Covance by Section 2.04 hereof.

         SECTION 3.03. Taxes resulting from the failure of either Distribution.
In the event that either the CCL Distribution or the Covance Distribution shall
fail to qualify for the tax treatment stated in the IRS Ruling, for reasons
other than those indemnified against in the Spin-Off Tax Indemnification
Agreements, any and all Taxes imposed upon or incurred by Corning, CCL or
Covance as a result of such failure (including any liability of Corning, CCL or
Covance arising from Taxes imposed on shareholders of Corning, CCL or Covance to
the extent any such shareholders successfully seek recourse against Corning, CCL
or Covance on account of such failure, or any liability for such Taxes which
Corning, CCL or Covance may assume or otherwise provide for) shall be allocated
among Corning, CCL and Covance in such a manner as will take into account the
extent to which the actions or inactions before, on or after the Distribution
Date of each of Corning, CCL, Covance and their respective Affiliates may have
contributed to such failure, and Corning, CCL and Covance each shall indemnify
and hold harmless the other from and against the Taxes so allocated to Corning,
CCL and Covance, respectively. In determining the extent to which Corning, CCL
and Covance may have contributed to such failure, all facts and circumstances
shall be taken into account. If it is determined that none of Corning, CCL or
Covance contributed to the failure of such Distribution to qualify for the tax

                                       8

<PAGE>

treatment stated in the IRS Ruling, the liability of Corning, CCL and Covance
under this Section 3.03 shall be borne by each corporation in proportion to
their relative average market capitalization as determined by the average
closing price for each of Corning, CCL and Covance common stock during the 20
trading-day period immediately following the Distribution Date. Any payments to
be made by any of Corning, CCL or Covance to another pursuant to this Section
3.03 shall be made in immediately available funds within ten (10) days of the
receipt of notice that a payment requiring indemnification under this Section
3.03 has been made (or is required to be made), or if there is disagreement
among the parties as to the amount or existence of liability under this Section
3.03, within ten (10) days of the resolution of such disagreement.

                                    ARTICLE 4
                               SEPARATE LIABILITY

         SECTION 4.01. Separate Federal Liability Computation. For all tax
periods beginning after December 31, 1995, for which CI Consolidated Returns
have not been filed by Corning as of the Distribution Date and in respect of
which Corning is required to file a CI Consolidated Return, CCL and Covance
respectively shall compute the CCL Separate Liability and the Covance Separate
Liability for the portion of such periods in which the CCL Domestic Companies
and the Covance Domestic Companies respectively are members of the CI Group.
"CCL Separate Liability" in respect of any CI Consolidated Return Period means
the federal income tax liability (including CCL's share of Corning's alternative
minimum tax if Corning is subject to alternative minimum tax for such CI
Consolidated Return Period, not to exceed Corning's consolidated alternative
minimum tax for such period) computed as of December 31, 1996, as if CCL had
filed a consolidated federal income tax return for the CCL Group in respect of
such CI Consolidated Return Period. "Covance Separate Liability" in respect of
any CI Consolidated Return Period means the federal income tax liability
(including Covance's share of Corning's alternative minimum tax if Corning is
subject to alternative minimum tax for such CI Consolidated Return Period, not
to exceed Corning's consolidated alternative minimum tax for such period)
computed as of December 31, 1996, as if Covance had filed a consolidated federal

                                       9

<PAGE>

income tax return for the Covance Group in respect of such CI Consolidated
Return Period. If, in computing the CCL Separate Liability or the Covance
Separate Liability, CCL or Covance calculates that the CCL Group or the Covance
Group, respectively, would experience a net operating loss resulting in no
federal income tax liability as of December 31, 1996, the CCL Separate Liability
or the Covance Separate Liability, as the case may be, shall be equal to a
credit amount calculated by Corning and equal to the reduction in the Federal
income tax liability of the CI Group by reason of the use of such net operating
loss of the CCL Group or the Covance Group, as the case may be, in the CI
Consolidated Return that Corning projects to be filed in respect of such period.
Except as may otherwise be required by the Spin-Off Tax Indemnification
Agreements, computations in respect of the CCL Separate Liability and the
Covance Separate Liability shall be consistent with prior CI Group returns,
shall follow the tax elections and other tax positions adopted or prescribed by
Corning and shall take into account the adjustments and modifications set forth
in Section 4.03; provided, however, that the Tax Director and/or General Counsel
of each of Corning and CCL or Covance, as the case may be, shall negotiate
reasonable modifications or alternatives to such requirements in the event that
either CCL or Covance, as the case may be, reasonably determines that such
elections, positions, adjustments or modifications would have a materially
detrimental effect on the tax obligations of CCL or Covance, as the case may be,
in respect of the current or any subsequent tax period.

         SECTION 4.02. Separate Covance/CCL Liability Computation. For all tax
periods beginning after December 31, 1995, for which CCL Returns have not been
filed by CCL as of the Distribution Date and in respect of which CCL is required
to prepare and file a CCL Return, Covance shall compute the Separate Covance/CCL
Liability for the portion of such periods in which the Covance Companies
respectively are subsidiaries of CCL. "Separate Covance/CCL Liability" in
respect of any tax period means the state, local and foreign tax liability
computed as of December 31, 1996, as if Covance had filed consolidated combined
or unitary state, local and foreign tax returns with the Covance Companies in
respect of such tax period. Except as may otherwise be required by the Spin-Off
Tax Indemnification Agreements, computations in respect of the Separate
Covance/CCL Liability shall be consistent with any prior CCL Returns,

                                       10

<PAGE>

shall follow the tax elections, positions, adjustments and modifications adopted
or prescribed by CCL and take into account adjustments and modifications similar
to those set forth in Section 4.03; provided, however, that the Tax Director
and/or General Counsel of each of CCL and Covance shall negotiate reasonable
modifications or alternatives to such requirements in the event that Covance
reasonably determines that such elections, positions, adjustments or
modifications would have a materially detrimental effect on the tax obligations
of Covance in respect of the current or any subsequent tax period.

         SECTION 4.03.  Adjustments.  In computing the liabilities under
Sections 4.01 and 4.02, CCL and Covance respectively shall take into account the
following adjustments and modifications:

                  (i)   Dividends from any member of the CI Group shall be
         eliminated;

                  (ii)  Gains or losses on intercompany transactions and
         intercompany distributions between any members of the CI Group shall be
         deferred and recognized pursuant to Treas. Reg. ss. 1.1502-13 and
         1.1502-14 and Code Section 267 and the regulations thereunder;

                  (iii) All carryforwards of tax credits (except the minimum tax
         credit), net operating losses, capital losses, charitable contributions
         and other similar items shall be determined consistent with prior CI
         Consolidated Returns;

                  (iv)  All ordinary income shall be subject to tax at the
         highest tax rate applicable to taxable ordinary income of corporations;

                  (v) Any exemption or similar item that must be prorated or
         apportioned among the component members of a controlled group of
         corporations shall not be taken into account; and

                  (vi)  Other adjustments specified by Corning shall be made.

         SECTION 4.04. Payments. In respect of each period for which liabilities
are required to be calculated pursuant to Section 4.01, CCL and Corning shall
provide for payments in respect of the CCL Separate Liability and Covance and
Corning shall provide for payments in

                                       11

<PAGE>

respect of the Covance Separate Liability, in each case effective as of December
31, 1996. In respect of each period for which liabilities are required to be
calculated pursuant to Section 4.02, Covance and CCL shall provide for payments
in respect of the Separate Covance/CCL Liability, effective as of December 31,
1996.

         SECTION 4.05. Discrepancies. (a) To the extent that the liabilities
calculated pursuant to Section 4.01 are not equal to the liabilities reported on
the actual tax returns filed in respect of the periods contemplated therein: (i)
Corning shall be liable for and shall indemnify and hold harmless the other
parties hereto against all liabilities and claims and shall receive all benefits
and refunds arising in respect of such differences that do not relate to
Temporary Differences attributable to CCL or Covance and (ii) CCL or Covance, as
the case may be, shall be liable for, make payment to Corning in respect of, and
indemnify and hold harmless the other parties hereto against all liabilities and
claims and shall receive all benefits and refunds arising in respect of such
differences that relate to Temporary Differences attributable to CCL or Covance,
respectively, in accordance with Section 7.01(b).

         (b) To the extent that the liabilities calculated pursuant to Section
4.02 are not equal to the liabilities reported on the actual tax returns filed
in respect of the periods contemplated therein, Covance shall be liable for,
make payment to CCL in respect of, and indemnify and hold harmless the other
parties hereto against all liabilities and claims where such actual liabilities
are greater than the liabilities calculated under Section 4.02 and shall receive
all benefits and refunds arising in respect of such differences attributable to
Covance where such actual liabilities are less than the liabilities calculated
under Section 4.02.

         (c) Payments to be made to Corning ,CCL or Covance in respect of
obligations arising under this Section 4.04 shall be made no later than five
days before the due date (without extensions) of the actual return to be filed.

         SECTION 4.06. State and local returns. The liabilities of CCL and the
CCL Companies and Covance and the Covance Companies with respect to CI State,
Local and Foreign Returns in respect of tax periods beginning before or on the
Distribution Date shall be computed as of December 31, 1996, under the
principles set forth in Section 4.01 and

                                       12

<PAGE>

compensation in respect to such liabilites shall be provided to Corning in
accordance with the principles of Sections 4.04 and 4.05.

                                    ARTICLE 5
                  POST-DISTRIBUTION CARRYBACKS OF TAX BENEFITS

         SECTION 5.01(a). CI Consolidated Returns; Net Operating Losses. If for
any taxable period beginning on or after the Distribution Date, a CCL Company or
a Covance Company incurs a net operating loss that may be carried back to a CI
Consolidated Return Period, the CCL Company or the Covance Company shall make an
election to relinquish the entire carryback period with respect to any such net
operating loss. If for any taxable period beginning on or after the Distribution
Date, a CCL Company or a Covance Company is entitled to a foreign tax credit or
a deduction in respect of such foreign taxes, such CCL Company or Covance
Company must take the deduction in lieu of the foreign tax credit, unless the
foreign tax credit can be fully utilized on a return other than a CI
Consolidated Return.

                  (b) Other Tax Benefits. If for any taxable period beginning on
or after the date of the CCL Distribution, a CCL Company or a Covance Company 
incurs a net capital loss, business credit or other Tax attribute that must be
carried back to a CI Consolidated Return (each a "Carryback Item"), such CCL
Company or Covance Company may file a refund claim reflecting such Carryback
Item only after having obtained a written consent from Corning. In the event
that such CCL Company or Covance Company does not obtain such written consent or
shall not be eligible to file such claim under applicable law, Corning may, at
the written request and expense of such CCL Company or Covance Company, file
amended returns or refund claims reflecting such Carryback Item. Such CCL
Company or Covance Company shall be compensated for the use of such Carryback
Item as follows:

                           (i) Corning shall, within thirty (30) days after
receipt thereof, pay to such CCL Company or Covance Company respectively any
refunds actually received by Corning resulting from the filing of an amended
return or refund claim with respect to such Carryback Item attributable to such
company, whether such amended return or refund claim was filed by

                                       13

<PAGE>

Corning or the CCL Company or the Covance Company, together with interest
received net of taxes with respect thereto. With respect to CCL, in the event
that Corning would have received a refund (including interest) with respect to
such claim had such refund not been offset against deficiencies, interest, or
penalties assessed against the CI Group or any member thereof (other than
deficiencies, interest or penalties (A) attributable to the operations of such
CCL Company and with respect to which such entity would otherwise be responsible
under the terms of this Agreement, (B) attributable to a taxable period of the
CI Group for which the statute of limitations has expired, (C) against which CCL
is obligated to indemnify Corning pursuant to the Spin-Off Tax Indemnity
Agreements or (D) in respect of which CCL is obligated to share payment pursuant
to Section 3.03 hereof), Corning shall pay to such CCL Company, within thirty
(30) days after receipt of notice of such offset, an amount equal to the amount
of such offset, together with interest that would have been paid to Corning if
such refund had not been offset. With respect to Covance, in the event that
Corning would have received a refund (including interest) with respect to such
claim had such refund not been offset against deficiencies, interest, or
penalties assessed against the CI Group or any member thereof (other than
deficiencies, interest or penalties (A) attributable to the operations of such
Covance Company and with respect to which such entity would otherwise be
responsible under the terms of this Agreement, (B) attributable to a taxable
period of the CI Group for which the statute of limitations has expired, (C)
against which Covance is obligated to indemnify Corning pursuant to the Spin-Off
Tax Indemnity Agreements or (D) in respect of which Covance is obligated to
share payment pursuant to Section 3.03 hereof), Corning shall pay to such
Covance Company, within thirty (30) days after receipt of notice of such offset,
an amount equal to the amount of such offset, together with interest that would
have been paid to Corning if such refund had not been offset.

                           (ii) If, for any taxable period, Corning is required
to and does make a repayment to the IRS of any portion of a refund described in
this Article 5 attributable to the denial of the CCL Company or Covance Company
Carryback Item, then such CCL Company or Covance Company shall pay to Corning in
immediately available funds within ten (10) days

                                       14

<PAGE>

following the date Corning notifies such CCL Company or Covance Company of such
repayment, the amount of such repayment including interest thereon.

                           (iii) If Corning elects not to file amended returns
or refund claims reflecting a Carryback Item as to which CCL or Covance might
receive a tax benefit, Corning shall notify such CCL Company or Covance Company
of its decision and state the amount including interest which it has determined
to be the appropriate compensation for its claim, and Corning shall pay such CCL
Company or Covance Company within ten (10) days of the receipt by Corning of
written notification that the CCL Company or the Covance Company agrees with its
determination, or upon irreconcilable disagreement between such parties, upon
receipt by Corning of a written determination of a nationally recognized
accounting firm or law firm with expertise sufficient to address the issues
presented and mutually agreeable to such parties.

              (iv) Notwithstanding anything to the contrary in this Article,
before Corning files a claim for refund or a CCL Company or a Covance Company is
permitted to file a claim for refund which reflects a Carryback Item and which
would affect a CI Consolidated Return, the validity and amount of any such
Carryback Item shall be reviewed and approved by Corning and such CCL Company or
Covance Company, as applicable, and, upon irreconcilable disagreement between
such parties, by a nationally recognized accounting firm or law firm with
expertise sufficient to address the issues presented and mutually agreeable to
such parties. Each CCL Company and each Covance Company, as applicable, agrees
to reimburse Corning for its reasonable expenses incurred in reviewing, filing
and securing any refund claim made at the request of such CCL Company or Covance
Company.

                                    ARTICLE 6
                  POST-DISTRIBUTION CARRYOVERS OF TAX BENEFITS

         SECTION 6.01. CI Group items. Corning shall notify CCL and Covance as
soon as practicable after the Distribution Date of any consolidated carryover
item which may be partially or totally attributed to and carried over by a CCL
Company or a Covance Company and will notify CCL and Covance of subsequent
adjustments which may affect such carryover item.

                                       15

<PAGE>

         SECTION 6.02. CCL Group Items. CCL shall notify Corning and Covance as
soon as practicable after the Distribution Date of any consolidated carryover
item which may be partially or totally attributed to and carried over by a
Covance Company and will notify Corning and Covance of subsequent adjustments
which may affect such carryover item. ARTICLE 7 AUDIT ADJUSTMENTS

         SECTION 7.01. CI Consolidated, State, Local and Foreign Returns. Except
as provided in the Spin-Off Tax Indemnification Agreements and in Section 3.03
hereof, if any tax liability or refund in respect of the CI Group arises as a
result of an audit by the IRS or other taxing authority and such tax liability
or refund relates to a CI Consolidated Return or a CI State, Local and Foreign
Return filed in respect of any period commencing before or on the Distribution
Date and such liability:

         (a) does not relate to Temporary Differences attributable to CCL or
         Covance, Corning shall be liable for and shall pay any tax liabilities
         and any interest and underpayment penalties associated therewith and
         Corning shall receive any such tax refunds and any interest associated
         therewith. Any penalties or additions to tax associated with tax
         liabilities that are not underpayment penalties shall be allocated
         among Corning, CCL and Covance in the proportion to which such
         penalties are assessed to Corning, CCL and Covance, respectively, or in
         the event such penalties are not clearly assessed to any individual
         party or parties, in such a manner as will take into account the extent
         to which each may have contributed to such penalties. Corning, CCL and
         Covance each shall indemnify and hold harmless the other from and
         against the penalties so allocated to Corning, CCL and Covance,
         respectively; or

         (b) does relate to Temporary Differences attributable to CCL or
         Covance, and such taxing authority:

                  (i) acknowledges directly or indirectly to Corning's sole
                  satisfaction that Corning may utilize such Temporary
                  Differences in computing tax liability,

                                       16

<PAGE>

                  benefit or refunds in respect of post-Distribution Date tax
                  periods, Corning shall be liable for and shall pay any such
                  tax liability and any interest and underpayment penalties
                  associated with such tax liability and shall receive any such
                  benefit or refunds and any interest associated therewith; or

                  (ii) does not acknowledge directly or indirectly to Corning's
                  sole satisfaction that Corning may utilize such Temporary
                  Differences in computing tax liability, benefit or refunds in
                  respect of post-Distribution Date tax periods, the party
                  hereto against which the issue giving rise to such tax
                  liability is directed shall be liable for and shall pay any
                  such tax liability and any interest and underpayment penalties
                  associated with such tax liability and shall receive any such
                  benefit or refunds and any interest associated therewith; and

         any liability and any penalties or additions to tax associated with
         such tax liability that are not underpayment penalties shall be
         allocated among Corning, CCL and Covance in the proportion to which
         such penalties have been assessed by such taxing authority to Corning,
         CCL and Covance, respectively, or in the event such penalties have not
         been clearly assessed to any individual party or parties, in such a
         manner as will take into account the extent to which each may have
         contributed to such penalties, and Corning, CCL and Covance each shall
         indemnify and hold harmless the other from and against the penalties so
         allocated to Corning, CCL and Covance, respectively.

         SECTION 7.02. Non-CI Consolidated, State, Local and Foreign Returns. If
any tax liability or refunds arise in respect of any member of the CI Group
(determined before giving effect to the Distributions) as a result of an audit
by the IRS or other taxing authority and such tax liability or refund does not
relate to a CI Consolidated Return or a CI State, Local and Foreign Return, the
party hereto against which the issue giving rise to such tax liability is
directed or in favor of which such return is applicable shall be liable for and
shall pay any such tax liability and any interest and penalties associated
therewith and shall receive any such refund and any interest associated
therewith, and shall indemnify and hold harmless the other parties hereto from
and against all such liabilities and any interest and penalties related thereto.

                                       17

<PAGE>

         SECTION 7.03. Other Audit Liabilities and Refunds. Except as otherwise
provided in this Article 7 or Articles 3 or 4 hereof or in the Spin-Off Tax
Indemnification Agreements, (a) CCL or Covance, as the case may be, shall be
liable for and shall pay all tax liabilities and any interest and penalties
associated therewith, and shall receive any tax refunds and any interest
associated therewith, that arise as a result of an audit by the IRS or other
taxing authority and that relate to the business or operations of CCL or
Subsidiaries of CCL and Covance or Subsidiaries of Covance, respectively, and
CCL and Covance each shall indemnify and hold harmless Corning and each other
from and against the penalties so allocated to CCL and Covance, respectively;
and (b) Corning shall be liable for and shall pay all tax liabilities and any
interest and penalties associated therewith, and shall receive any tax refunds
and any interest associated therewith, that arise as a result of an audit by the
IRS or other taxing authority and that relate to the business or operations of
Corning or Corning Subsidiaries.

         SECTION 7.04. Expenses. Any out-of-pocket expenses (e.g., travel
expenses, accountants' fees, attorneys' fees, experts' fees, etc.) incurred by
the CI Group in connection with proposed or actual liabilities or refunds of the
type contemplated in this Article 7 shall be paid by the entities to which such
liabilities or refunds are allocated hereunder. In cases where such expenses
relate to more than one member of the CI Group or more than one party hereto,
the parties affected shall determine how such expenses shall be allocated.

                                    ARTICLE 8
                                    CONTESTS

         SECTION 8.01. CI Group Contests; Notification and communication. If a
notice of audit is given, an audit is begun, an audit adjustment is (or has
been) proposed, or any other claim is (or has been) made by any taxing authority
with respect to a tax liability that, pursuant to the terms hereof, may be
attributable to a CCL Company or a Covance Company with regard to a CI
Consolidated Return or a CI State, Local and Foreign Return, Corning shall
promptly

                                       18

<PAGE>

notify CCL and Covance of such event (unless a CCL Company and a Covance Company
previously was notified directly by the relevant tax authority). Thereafter,
Corning or CCL or Covance, as the case may be, shall keep the others, on a
timely basis, informed of all material developments in connection with audits,
administrative proceedings, litigation and other similar matters that may affect
their respective tax liabilities. Failure or delay in providing notification
hereunder shall not relieve any party hereto of any obligation hereunder in
respect of any particular tax liability, except to the extent that such failure
or delay restricts the ability of such party to contest such liability
administratively or in the courts and otherwise materially and adversely
prejudices such party.

         SECTION 8.02. Group Contests; Control and Management of Claims. (a) As
among the parties hereto, Corning shall control the prosecution of any audits
and any contests in respect of any claim made by a taxing authority on audit or
in a related administrative or judicial proceeding or in respect of any refund
or credit of taxes, and shall make and prosecute other claims for refunds with
respect to any tax liability, that relates to a CI Consolidated Return Period or
a CI State, Local and Foreign Return Period. CCL or Covance, as the case may be,
may participate in such audits or contests to the extent that Corning in its
sole discretion shall deem appropriate, provided, however, that Corning shall
have the sole right to control, at Corning's expense, the prosecution of any
audit, refund claim or related administrative or judicial proceeding with
respect to those matters which could affect the CI Group's tax liability.

         (b) With respect to a tax liability or refund that, pursuant to the
provisions hereof, may be attributable to a CCL Company or a Covance Company
relating to a CI Consolidated Return Period or a CI State, Local and Foreign
Return Period, if Corning elects not to exercise its rights of control under
subsection (a) hereof, and if CCL or Covance so requests, Corning shall contest,
control and allow CCL or Covance, as the case may be, to participate to the
extent that Corning in its sole discretion shall deem appropriate, all at CCL's
or Covance's respective expense, or in the alternative shall permit CCL or
Covance at its own expense to contest and control a claim made by a taxing
authority on audit or in a related administrative or judicial

                                       19

<PAGE>

proceeding or by appropriate claim for refund or credit of taxes (or to make and
prosecute other claims for refund. CCL or Covance, as the case may be, shall pay
all out-of-pocket and other costs relating to such contests, including but not
limited to fees for attorneys, accountants, expert witnesses or other
consultants.

         (c) If asserted liabilities unrelated to the matters contemplated
herein become grouped with contests arising hereunder, the parties shall use
their respective best efforts to cause the contest arising hereunder to be the
subject of a separate proceeding.

         (d) With respect to matters arising hereunder controlled by Corning,
and where deemed necessary by Corning, CCL and Covance respectively shall compel
the relevant CCL Company or Covance Company to authorize by appropriate powers
of attorney such persons as Corning shall designate to represent such CCL
Company or Covance Company with respect to such matters. The parties hereto
shall reasonably cooperate with one another in a timely manner with respect to
any matter arising hereunder.

         (e) With respect to a particular adjustment or claim made with respect
to a CCL Company or a Covance Company that, pursuant to the provisions hereof,
may be attributable to a CCL Company or a Covance Company, to the extent, and
for so long as, Corning, in the exercise of its reasonable judgment, is
satisfied that CCL and the CCL Companies or Covance and the Covance Companies
can and will meet all their obligations under this Agreement, Corning shall not
settle, compromise, or concede such adjustment or claim without the written
consent of CCL or Covance, as the case may be, which consent shall not be
unreasonably withheld.

         (f) Group contests and the control and management of matters hereunder
relating solely to CCL Returns shall be subject to the provisions of this
Section 8.02, applied as if CCL was Corning and Covance was CCL for purposes
thereof.

                                    ARTICLE 9

                                       20

<PAGE>

                 INFORMATION AND COOPERATION; BOOKS AND RECORDS

         SECTION 9.01(a). Each of CCL and Covance shall deliver to Corning, as
soon as practicable after Corning's request, and Covance shall deliver to CCL,
as soon as practicable after CCL's request, such information and data concerning
the operations conducted before or as of the Distribution Date by the CCL
Companies and the Covance Companies respectively and make available such
knowledgeable employees of the CCL Companies and Covance Companies respectively
as Corning or CCL, as the case may be, may reasonably request, including
providing the information and data required by Corning's, CCL's or Covance's
customary internal tax and accounting procedures, in order to enable each of
Corning or CCL, as the case may be, to complete and file all tax forms or
reports that it may be required to file with respect to the activities of the
CCL Companies and the Covance Companies for taxable periods ending on, prior to
or including the Distribution Date, to respond to audits by any taxing
authorities with respect to such activities, to prosecute or defend any
administrative or judicial proceeding and to otherwise enable Corning or CCL, as
the case may be, to satisfy its accounting and tax requirements. CCL and Covance
shall provide office space to IRS and other tax auditors when they are
conducting on-site audits, and to employees and representatives of Corning or
CCL, as the case may be, as long as a CI Consolidated Return Period or a CI
State, Local and Foreign Return Period or a CCL Return Period, as the case may
be, is open to assessment of additional taxes or an assessment with respect to
such period is being contested. Corning shall deliver to CCL or Covance as soon
as practical after CCL's or Covance's request, and CCL shall deliver to Covance
as soon as practical after Covance's request, such information and data
concerning any tax attributes which were allocated to a CCL Company or a Covance
Company that is reasonably necessary in order to enable CCL or Covance to
complete and file all tax forms or reports that it may be required to file with
respect to such activities of the CCL Companies or the Covance Companies from
and after the Distribution Date, to respond to audits by any tax authorities
with respect to such activities, to prosecute or defend claims for taxes in any
administrative or judicial proceeding, and to otherwise enable CCL or Covance to
satisfy its

                                       21

<PAGE>

accounting and tax requirements. In addition, Corning shall make available to
CCL and Covance, and CCL shall make available to Covance, its knowledgeable
employees for such purpose.

         (b). Each CCL Company and each Covance Company shall retain all books,
records, documentation or other information relating to any CI Consolidated
Return or CI State, Local and Foreign Return, and each Covance Company shall
retain all books, records, documentation or other information relating to any
CCL Return Period, until the expiration of the applicable statute of limitations
(including any extension or waiver thereof). Upon the expiration of any statute
of limitations, the foregoing information may be destroyed or disposed of
provided that (i) the CCL Company or the Covance Company provides sixty (60)
days prior written notice to Corning or CCL, as the case may be, describing in
reasonable detail the documentation to be destroyed or disposed of and (ii)
Corning or CCL, as the case may be, agrees in writing to such destruction or
disposal. If Corning or CCL, as the case may be, objects to the proposed
destruction or disposal, then the CCL Company or the Covance Company shall
promptly deliver such materials to Corning or CCL, as the case may be, or
continue to retain such materials.

                                   ARTICLE 10
                               GENERAL PROVISIONS

         SECTION 10.01.  Effectiveness. The effectiveness of this Agreement and
the obligations and rights created hereunder are subject and conditioned upon
the completion of the Distributions pursuant to the terms of the Transaction
Agreement.

                  SECTION 10.02. Notices. All notices, requests, claims, demands
         and other communications hereunder shall be in writing and shall be
         given or made (and shall be deemed to have been duly given or made upon
         receipt) by delivery in person, by courier service (including overnight
         delivery), by cable, by telecopy confirmed by

                                       22

<PAGE>

         return telecopy, by telegram, by telex or by registered or certified
         mail (postage prepaid, return receipt requested) to the respective
         parties at the addresses (or at such other address for a party as shall
         be specified in a notice given in accordance with this Section 10.01)
         listed below:

         (a)      To Corning Incorporated:
                  One Riverfront Plaza
                  Corning, New York  14831
                  Telecopy: (607) 974-8656
                  Attn: each of the General Counsel and Tax Director

         (b)      To CCL:
                  One Malcolm Avenue
                  Teterboro, New Jersey 07608
                  Telecopy: (201) 462-4795
                  Attn: each of the General Counsel and Tax Director

         (c)      To Covance:
                  210 Carnegie Center
                  Princeton, New Jersey 08540-6233
                  Telecopy:(609) 452-9865
                  Attn: each of the General Counsel and Tax Director

         SECTION 10.03. Complete Agreement; Construction. This Agreement is
intended to provide rights, obligations and covenants in respect of Taxes and,
together with the Spin-Off Tax Indemnification Agreements, shall supersede all
prior agreements and undertakings, both written and oral, between the parties
with respect to the subject matter hereof and thereof. In the event provisions
of this Agreement are inconsistent with provisions in a Spin-Off Tax
Indemnification Agreement, the provisions in the Spin-Off Tax Indemnification
Agreement shall control, except in cases where this construction would provide a
duplicate benefit.

         SECTION 10.04. Counterparts. This Agreement may be executed in one or
more counterparts, and by the different parties hereto in separate counterparts,
each of which when

                                       23

<PAGE>

executed shall be deemed to be an original but all of which taken together shall
constitute one and the same agreement.

         SECTION 10.05. Waiver. The parties to this Agreement may (a) extend the
time for the performance of any of the obligations or other acts of the other
party or parties, (b) waive any inaccuracies in the representations and
warranties of the other party or parties contained herein or in any document
delivered by the other party or parties pursuant hereto or (c) waive compliance
with any of the agreements or conditions of the other party or parties contained
herein. Any such extension or waiver shall be valid only if set forth in an
instrument in writing signed by the party to be bound thereby. Any waiver of any
term or condition shall not be construed as a waiver of any subsequent breach or
a subsequent waiver of the same term or condition, or a waiver of any other term
or condition, of this Agreement. The failure of any party to assert any of its
rights hereunder shall not constitute a waiver of any such rights.

         SECTION 10.06. Amendments. This Agreement may not be amended or
modified except (a) by an instrument in writing signed by, or on behalf of, the
parties or (b) by a waiver in accordance with Section 10.05.

         SECTION 10.07. Successors and Assigns. The provisions of this Agreement
shall be binding upon, inure to the benefit of and be enforceable by the parties
and their respective successors and permitted assigns. This Agreement cannot be
assigned by Corning, CCL or Covance, in each case without the consent of the
other two parties hereto.

         SECTION 10.08. Subsidiaries. Each of the parties hereto shall cause to
be performed, and hereby guarantees the performance of, all actions, agreements
and obligations set forth herein to be performed by any subsidiary of such party
or by any entity that is contemplated to be a subsidiary of such party on and
after the Distribution Date.

                                       24

<PAGE>

         SECTION 10.09. Third Party Beneficiaries. This Agreement shall be
binding upon and inure solely to the benefit of the parties hereto and their
respective subsidiaries, and nothing herein, express or implied, is intended to
or shall confer upon any third parties any legal or equitable right, benefit or
remedy of any nature whatsoever under or by reason of this Agreement.

         SECTION 10.10. Headings. The descriptive headings contained in this
Agreement are for convenience of reference only and shall not affect in any way
the meaning or interpretation of this Agreement.

         SECTION 10.11. Specific Performance. The parties hereto agree that
irreparable damage would occur in the event any provision of this Agreement was
not performed in accordance with the terms hereof and that the parties shall be
entitled to specific performance of the terms hereof, in addition to any other
remedy at law or equity.

         SECTION 10.12. Governing Law. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of New York, applicable to
contracts executed in and to be performed entirely within that state.

         SECTION 10.13. Arbitration. Any conflict or disagreement arising out of
the interpretation, implementation, or compliance with the provisions of this
Agreement shall be finally settled pursuant to the provisions of Article V
(Dispute Resolution) of the Transaction Agreement, which provisions are
incorporated herein by reference.

         SECTION 10.14. Severability. If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any law or
public policy, all other terms and provisions of this Agreement shall
nevertheless remain in full force and effect so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party. Upon such determination that any term or other

                                       25

<PAGE>

provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible in an acceptable manner in
order that the transactions contemplated hereby are consummated as originally
contemplated to the greatest extent possible.

                                       26

<PAGE>

                  IN WITNESS WHEREOF, the parties have caused this Agreement to
be executed as of the date first written above by their respective officers
thereunto duly authorized.

                                       CORNING INCORPORATED,

                                       by /s/ James B. Flaws
                                          ------------------------------------
                                          Name:
                                          Title:

                                       CORNING CLINICAL LABORATORIES INC.,

                                       by /s/ Robert A. Carothers
                                          ------------------------------------
                                          Name:
                                          Title:

                                       COVANCE INC.,

                                       by /s/ Jeffrey S. Hurwitz
                                          ------------------------------------
                                          Name: Jeffrey S. Hurwitz
                                          Title: Corporate Senior Vice President

MPE
taxshar.009

                                       27



                                                        
               CORNING/COVANCE SPIN-OFF TAX INDEMNIFICATION AGREEMENT

                  This SPIN-OFF TAX INDEMNIFICATION AGREEMENT ("Agreement") is
made and entered into this 16th day of December, 1996, by and among CORNING
INCORPORATED, a New York corporation ("Corning") and COVANCE INC., a Delaware 
corporation ("Covance").

                                   WITNESSETH

                  WHEREAS, Corning is the common parent of an affiliated group
of corporations within the meaning of Code1 Section 1504 which includes Covance;

                  WHEREAS, Corning has determined to effect the Distributions
pursuant to a Transaction Agreement and Plan of Reorganization (the "Transaction
Agreement") dated of even date herewith;

                  WHEREAS, the IRS has issued the IRS Ruling which states the 
tax treatment of the Distributions and the Other Transactions; and

                  WHEREAS, the parties hereto are entering into this Agreement
to indemnify Corning as hereinafter provided in the event the Distributions or
the Other Transactions fail to qualify for the tax treatment stated in the IRS
Ruling due to actions by Covance.

                  NOW, THEREFORE, in consideration of the mutual agreements,
provisions and covenants contained in this Agreement, the parties hereby agree
as follows:

                    ARTICLE 1: Representations and Covenants

                  SECTION 1.01. Representations. (a) Covance has reviewed the
materials submitted to the IRS in connection with the IRS Ruling and, to the
best of Covance's knowledge, these materials, including, without limitation, any
statements and representations concerning Covance, its business, operations
capital structure and/or organization, are complete and accurate in all material
respects. Covance shall, and shall cause each member of the Covance Group, to
comply with each such representation and statement concerning Covance and the
Covance Group made in the materials so submitted, the IRS Ruling and any
subsequent IRS ruling, including without limitation, statements as to the
creation, funding and operation of employee compensation

- --------

1 Capitalized terms not defined herein have the meaning given to them in Annex
A.

<PAGE>

plans by Covance. With respect to any representation or statement made by or on
behalf of Covance in connection with the IRS Ruling and any subsequent IRS
ruling and to the extent such representation or statement relates to future
actions or events under their control, neither Covance nor any member of the
Covance Group will take any action during the Restricted Period that would have
caused such representation or statement to be untrue if Covance had planned or
intended to take such action at the time such representation or statement was
made by or on behalf of Covance.

                  (b) Covance hereby represents and warrants to Corning that 
Covance has no present intention to undertake any of the transactions set forth
in Section 1.02 (a) (iii) or to cease to engage in the active conduct of the
trade or business (within the meaning of Section 355(b)(2) of the Code) of
providing pharmaceutical services.

                  SECTION 1.02. Covenants. (a) Covance covenants and agrees with
Corning that during the Restricted Period:

                  (i) Covance will continue to engage in the pharmaceutical 
services business in the U.S. and will continue to maintain in the U.S. a
substantial portion of its assets and business operations as they existed prior
to the Distributions, provided that the foregoing shall not be deemed to
prohibit Covance from entering into or acquiring other businesses or operations
which may or may not be consistent with its business and operations as they
existed prior to the Distributions so long as Covance continues to engage in
such pharmaceutical services business in the U.S. and continues to so maintain
such substantial portion in the U.S.;

                  (ii) Covance will continue to manage and to own (A) directly
assets which represent at least fifty percent (50%) of the Gross Assets which
Covance managed and owned directly immediately after the Distributions, and (B)
directly or indirectly through one or more entities, assets which represent at
least 50% of the Gross Assets which Covance owned indirectly through one or more
entities immediately after the Distributions;

                  (iii) except as provided in Section 1.02(c), neither Covance, 
nor any of its Affiliates nor any of their respective, directors, officers or
other representatives will undertake, authorize, approve, recommend, permit,
facilitate, or enter into any contract, or consummate any transaction with
respect to: (A) the issuance of Covance Common Stock (including options,
warrants, rights or securities exercisable for, or convertible into, Covance
Common Stock) in a single transaction or in a series of related or unrelated
transactions or otherwise or in the aggregate which would exceed (or could
exceed if any such options, warrants or rights were exercised or such securities
were converted) fifty percent (50%) when expressed as a percentage of the
outstanding shares of Covance Common Stock immediately following the
Distributions; (B) the issuance of any class or series of capital stock or any
other instrument (other than Covance Common Stock and options, warrants, rights
or securities exercisable for, or convertible into, Covance Common Stock) that
would constitute equity for federal tax purposes (such classes or series of
capital stock and other instruments being referred to herein as

                                       2
<PAGE>

"Disqualified Covance Stock"); (C) the issuance of any options, rights,
warrants, securities or similar arrangements exercisable for, or convertible
into, Disqualified Covance Stock; (D) any redemptions, repurchases or other
acquisitions of capital stock or other equity interests in Covance in a single
transaction or a series of related or unrelated transactions, unless such
redemptions, repurchases or other acquisitions (1) satisfy the following
requirements: (a) there is a "sufficient business purpose" (within the meaning
of Section 4.05(1)(b) of Revenue Procedure 96-30) for the transaction, (b) the
stock to be purchased, redeemed or otherwise acquired is widely held, (c) the
stock purchases or other acquisitions will be made on the open market, and (d)
the amount of stock purchases, redemption, or other acquisitions in a single
transaction or in a series of related or unrelated transactions will not exceed
an amount of stock representing twenty percent (20%) of the outstanding stock of
Covance immediately following the Distributions; or (2) are made in connection
with employee equity compensation plans of Covance and do not result,
individually or in the aggregate, in the acquisition of more than ten percent
(10%) of the voting power in respect of the outstanding stock of Covance
immediately following the Distributions, (E) the dissolution, merger , or
complete or partial liquidation of Covance or any announcement of such action;
or (F) the waiver, amendment, termination or modification of any provision of
the Covance Rights Plan in connection with, or in order to permit or facilitate,
any acquisition or proposed acquisition of Beneficial Ownership of capital stock
or other equity interest in Covance.

                  (b) In addition to the other representations, warranties,
covenants and agreements set forth in this Agreement, Covance and the Covance
Group will take, or refrain from taking, as the case may be, such actions as
Corning may reasonably request during the Ruling Period as necessary to insure
that the Distributions and the Other Transactions qualify for the tax treatment
stated in the IRS Ruling, including, without limitation, such actions as Corning
determines may be necessary to obtain and preserve the IRS Ruling or any
subsequent IRS ruling on which the parties can rely. Without limiting the
generality of the foregoing, Covance and the Covance Group shall cooperate with
Corning if Corning determines to obtain additional IRS rulings pertaining to
whether any actual or proposed change in facts and circumstances affects the tax
status of the Distributions or the Other Transactions.

                  (c) Following the six-month anniversary of the Distribution
Date, Covance and its Affiliates may take any action or engage in conduct
otherwise prohibited by Section 1.02 so long as prior to such action or conduct,
as the case may be, Corning or Covance receives (A) a ruling from the IRS in
form and substance reasonably satisfactory to Corning and upon which Corning can
rely to the effect that the proposed action or conduct, as the case may be, will
not cause the Distributions or the Other Transactions to fail to qualify for the
tax treatment stated in the IRS Ruling or otherwise to be taxable for federal
income tax purposes, or (B) an Opinion of Counsel in form and substance
reasonably satisfactory to Corning and upon which Corning can rely to the effect
that the proposed action or conduct, as the case may be, will not cause the
Distributions or the Other Transactions to fail to qualify for the tax treatment
stated in the IRS Ruling or otherwise to be taxable for federal income tax
purposes.

                                       3
<PAGE>

                      ARTICLE 2: Covance Indemnity Obligations

                  SECTION 2.01. Tax Indemnities. (a) If Covance, or another 
member of the Covance Group (collectively the "Indemnifying Party") shall take
any action prohibited by Article 1 or shall violate a representation or covenant
contained in Article 1, and either of the Distributions or any of the Other
Transactions shall fail to qualify for the tax treatment stated in the IRS
Ruling primarily as a result of such action or violation, then the Indemnifying
Party shall (jointly or severally) indemnify and hold harmless Corning and each
member of the Corning Group (collectively the "Indemnified Party") against any
and all Taxes imposed upon or incurred by the Indemnified Party as a result of
the failure, including, without limitation, any liability of the Indemnified
Party arising from Taxes imposed on shareholders of Corning to the extent any
shareholder or shareholders of Corning successfully seek recourse against the
Indemnified Party on account of any such failure, or any liability for such
Taxes which the Indemnified Party may assume or otherwise provide for.

                  (b) Notwithstanding anything to the contrary set forth in this
Agreement, if, during the Restricted Period, any Person or Group of Affiliated
Persons or Associated Persons acquires Beneficial Ownership of twenty percent
(20%) or more of Covance Common Stock (or any other class of outstanding Covance
stock) or commences a tender or other purchase offer for the capital stock of
Covance upon consummation of which such Person or Group of Affiliated Persons or
Associated Persons would acquire Beneficial Ownership of twenty percent (20%) or
more of the Covance Common Stock (or any other class of outstanding Covance
stock) and either of the Distributions or any of the Other Transactions shall
fail to qualify for the tax treatment stated in the IRS Ruling primarily as a
result of such acquisition or tender or other purchase offer; then the
Indemnifying Party shall indemnify and hold harmless the Indemnified Party
against any and all Taxes imposed upon or incurred by the Indemnified Party
and/or its shareholders as a result of the failure of either Distribution or the
Other Transactions to so qualify.

                  (c) The Indemnified Party shall be indemnified and held
harmless under Section 2.01(a) without regard to the fact that the Indemnified
Party may have received a supplemental ruling from the IRS or an Opinion of
Counsel as contemplated by Section 1.02(c). The Indemnified Party shall be
indemnified and held harmless under Section 2.01(b) without regard to whether an
acquisition of Beneficial Ownership results from a transaction which is not
prohibited under Article 1.

                                       4
<PAGE>

                   ARTICLE 3: Calculation of Indemnity Amounts

                  SECTION 3.01.  Amount of Indemnified Liability.
The amount indemnified against under Article 2 ("Indemnified Liability") for a
tax based on or determined with reference to income shall be deemed to be the
amount of the tax computed by multiplying (i) the taxing jurisdiction's highest
marginal tax rate applicable to taxable income of corporations such as the
Indemnified Party on income of the character subject to tax and indemnified
against under Article 2 for the taxable period in which the Distributions occur,
times (ii) the gain or income of the Indemnified Party which is subject to tax
in the taxing jurisdiction and indemnified against under Article 2. In the case
of an Indemnified Liability attributable to a payment owed to a shareholder or
shareholders of Corning, the amount of the Indemnified Liability shall be equal
to the amount so owed, including without limitation, interest, costs, additions,
expenses and penalties. All amounts payable under this Agreement shall be paid
on an after-tax basis. If an Indemnified Liability is of a type that constitutes
a deduction from income in any taxable period in determining the Indemnified
Party's liability for a tax based upon or determined with reference to income,
the amount of the Indemnified Liability shall be reduced by the reduction in the
tax liability of the Indemnified Party.

                          ARTICLE 4: Procedural Matters

                  SECTION 4.01. General. (a) If either the Indemnified Party or
the Indemnifying Party receives any written notice of deficiency, claim or
adjustment or any other written communication from a taxing authority that may
result in an Indemnified Liability, the party receiving such notice or
communication shall promptly give written notice thereof to the other party,
provided that any delay by the Indemnified Party in so notifying an Indemnifying
Party shall not relieve the Indemnifying Party of any liability hereunder,
except to the extent (i) such delay restricts the ability of the Indemnifying
Party to contest the resulting Indemnified Liability administratively or in the
courts in accordance with Section 4.02 and (ii) the Indemnifying Party is
materially and adversely prejudiced by such delay.

                  (b) The parties hereto undertake and agree that from and after
such time as they obtain knowledge that any representative of a taxing authority
has begun to investigate or inquire into either Distribution or any of the Other
Transactions (whether or not such investigation or inquiry is a formal or
informal investigation or inquiry), the party obtaining such knowledge shall (i)
notify the other party thereof, provided that any delay by the Indemnified Party
in so notifying the Indemnifying Party shall not relieve the Indemnifying Party
of any liability hereunder (except to the extent (A) such delay restricts the
ability of the Indemnifying Party to contest the resulting Indemnified Liability
administratively or in the courts in accordance with Section 4.02 and (B) the
Indemnifying Party is materially and adversely prejudiced by such delay), (ii)
consult with the other party from time to time as to the conduct of such
investigation or inquiry, (iii) provide the other party with copies of all
correspondence with such taxing authority or any representative thereof
pertaining to such investigation or inquiry, and (iv) arrange for a
representative of the other party to be present at

                                       5
<PAGE>

all meetings with such taxing authority or any representative thereof pertaining
to such investigation or inquiry.

                  SECTION 4.02. Contests. (a) Provided that (i) the Indemnifying
Party shall furnish the Indemnified Party with evidence reasonably satisfactory
to the Indemnified Party of its ability to pay the full amount of the
Indemnified Liability and (ii) the Indemnifying Party acknowledges in writing
that the asserted liability is an Indemnified Liability, the Indemnifying Party
shall assume and direct the defense or settlement of any hearing, arbitration,
suit or other proceeding (each a "Proceeding") commenced, filed or otherwise
initiated or convened to investigate or resolve the existence and extent of such
liability.

                  (b) If the Indemnified Liability is grouped with other
unrelated asserted liabilities or issues in the Proceeding, the parties shall
use their respective best efforts to cause the Indemnified Liability to be the
subject of a separate proceeding. If such severance is not possible, the
Indemnifying Party shall assume and direct and be responsible only for the
matters relating to the Indemnified Liability.

                  (c) If at any time during a Proceeding controlled by the
Indemnifying Party pursuant to Section 4.02(a) the Indemnifying Party fails to
provide evidence reasonably satisfactory to the Indemnified Party of its ability
to pay the full amount of the Indemnified Liability or the Indemnified Party
reasonably determines, after due investigation, that the Indemnifying Party
could not pay the full amount of the Indemnified Liability, then the Indemnified
Party may assume control of the Proceedings upon seven (7) days written notice.

                  (d) The Indemnifying Party shall pay all out-of-pocket
expenses and other costs related to the Indemnified Liability, including but not
limited to fees for attorneys, accountants, expert witnesses or other
consultants retained by the Indemnifying Party and/or the Indemnified Party,
other than fees for attorneys, accountants, expert witnesses or other
consultants retained solely by the Indemnified Party and incurred at any time
during which the Indemnifying Party is controlling and directing the Proceeding
in respect of which such fees are incurred. To the extent that any such expenses
and other costs have been or are paid by an Indemnified Party, the Indemnifying
Party shall promptly reimburse the Indemnified Party therefor.

                  (e) The Indemnifying Party shall not pay (unless otherwise
required by a proper notice of levy and after prompt notification to the
Indemnified Party of receipt of notice and demand for payment), settle,
compromise or conceded any portion of the Indemnified Liability without the
written consent of the Indemnified Party, which consent shall not be
unreasonably withheld. The Indemnifying Party shall, on a timely basis, keep the
Indemnified Party informed of all developments in the Proceeding and provide the
Indemnified Party with copies of all pleadings, briefs, orders, and other
written papers.

                                       6
<PAGE>

                  (f) Any Proceeding which is not controlled or which is no
longer controlled by the Indemnifying Party pursuant to Section 4.02 shall be
controlled and directed exclusively by the Indemnified Party, and any related
out-of-pocket expenses and other costs incurred by the Indemnified Party,
including but not limited to, fees for attorneys, accountants, expert witnesses
or other consultants, shall be reimbursed by the Indemnifying Party. The
Indemnified Party will not be required to pursue the claim in the federal
district court, Court of Claims or any state court if as a prerequisite to such
Court's jurisdiction, the Indemnified Party is required to pay the asserted
liability unless the funds necessary to invoke such jurisdiction are provided by
the Indemnifying Party.

                  SECTION 4.03.  Time and Manner of Payment.  The
Indemnifying Party shall pay to the Indemnified Party the amount of the
Indemnified Liability and any expenses or other costs indemnified against (less
any amount paid directly by the Indemnifying Party to the taxing authority) no
less than (7) business days prior to the date payment of the Indemnified
Liability is to be made by any party to the taxing authority. Such payment shall
be paid by wire transfer of immediately available funds to an account designated
by the Indemnified Party by written notice to the Indemnifying Party prior to
the due date of such payment. If the Indemnifying Party delays making payment
beyond the due date hereunder, such party shall pay interest on the amount
unpaid at the IRS Penalty Rate for each day and the actual number of days for
which any amount due hereunder is unpaid.

                  SECTION 4.04. Refunds. In connection with this Agreement,
should an Indemnified Party receive a refund in respect of amounts paid by an
Indemnifying Party to any taxing authority on its behalf, or should any such
amounts that would otherwise be refundable to the Indemnifying Party be applied
by the taxing authority to obligations of the Indemnified Party unrelated to an
Indemnified Liability, then such Indemnified Party shall, promptly following
receipt (or notification of credit), remit such refund and any related interest
to the Indemnifying Party.

                  SECTION 4.05. Cooperation. The parties shall cooperate with
one another in a timely manner in any administrative or judicial proceeding
involving any matter that may result in an Indemnified Liability.

                          ARTICLE 5: General Provisions

                  SECTION 5.01. Notices. All notices, requests, claims and other
communications hereunder shall be in writing and shall be given or made (and
shall be deemed to have been duly given or made upon receipt) by delivery in
person, by courier service, by cable, by telecopy, by telegram, by telex or by
registered or certified mail (postage prepaid, return receipt requested) to the
respective parties at the addresses (or at such other address for a party as
shall be specified in a notice given in accordance with this Section 5.01)
listed below:

                                       7

<PAGE>

                  To Corning:
                           One Riverfront Plaza
                           Corning, New York  14831
                           Telecopy:
                           Attn: General Counsel

                  To Covance:
                           Carnegie Center
                           Princeton, New Jersey  08540-6233
                           Telecopy:
                           Attn: General Counsel

                  SECTION 5.02.  Miscellaneous.  This Agreement, including the
attachments, shall constitute the entire agreement between the parties hereto
with respect to the subject matter hereof and shall supersede all prior
agreements and undertakings, both written and oral, between the parties with
respect to the subject matter hereof and thereof. This Agreement may be executed
in one or more counterparts, and by the different parties hereto in separate
counterparts, each of which when executed shall be deemed to be an original but
all of which taken together shall constitute one and the same agreement. This
Agreement may not be amended or modified except (a) by an instrument in writing
signed by, or on behalf of, the parties or (b) by a waiver in accordance with
Section 5.03. This Agreement shall be binding upon and inure solely to the
benefit of the parties hereto and their respective subsidiaries, and nothing
herein, express or implied, is intended to or shall confer upon any third
parties any legal or equitable right, benefit or remedy of any nature whatsoever
under or by reason of this Agreement.

                  SECTION 5.03. Waiver. The parties to this Agreement may (a)
extend the time for the performance of any of the obligations or other acts of
the other party or parties, (b) waive any inaccuracies in the representations
and warranties of the other party or parties contained herein or in any document
delivered by the other party or parties pursuant hereto or (c) waive compliance
with any of the agreements or conditions of the other party or parties contained
herein. Any such extension or waiver shall be valid only if set forth in an
instrument in writing signed by the party to be bound thereby. Any waiver of any
term or condition shall not be construed as a waiver of any subsequent breach or
a subsequent waiver of the same term or condition, or a waiver of any other term
or condition, of this Agreement. The failure of any party to assert any of its
rights hereunder shall not constitute a waiver of any such rights.

                  SECTION 5.04.  Successors and Assigns.  The provisions of
this Agreement shall be binding upon, inure to the benefit of and be enforceable
by the parties and their respective successors and permitted assigns.
Notwithstanding the previous sentence, Covance shall not assign this Agreement
or any rights, interests or obligations hereunder, or delegate performance of
any of its obligations hereunder, without the consent of Corning.

                                       8
<PAGE>

                  SECTION 5.05.  Specific Performance.  The parties hereto
agree that irreparable damage would occur in the event any provision of this
Agreement was not performed in accordance with the terms hereof and that the
parties shall be entitled to specific performance of the terms hereof, in
addition to any other remedy at law or equity.

                  SECTION 5.06.  Governing Law and Severability.
This Agreement shall be governed by, and construed in accordance with, the laws
of the State of New York, applicable to contracts executed in and to be
performed entirely within that state. If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any law or
public policy, all other terms and provisions of this Agreement shall
nevertheless remain in full force and effect so long as the economic or legal
substance of the transactions contemplated hereby is not affected in any manner
materially adverse to any party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible in an acceptable manner in
order that the transactions contemplated hereby are consummated as originally
contemplated to the greatest extent possible.

         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed as of the date first written above by their respective officers
thereunto duly authorized.

CORNING INCORPORATED                        COVANCE INC.

By /s/ James B. Flaws                       By /s/ Jeffrey S. Hurwitz
   ------------------------------              --------------------------------
Name:                                         Name:  Jeffrey S. Hurwitz
Title:                                        Title: Corporate Senior 
                                                     Vice President

                                       9

<PAGE>


                                     ANNEX A
                                   DEFINITIONS

"Affiliate" shall mean, when used with respect to a specified Person, another
Person that directly, or indirectly through one or more intermediaries, controls
or is controlled by or is under common control with such Person.

"Affiliated Person" shall have the meaning ascribed to such term in the
Investment Company Act of 1940, as amended, and the rules and regulations
promulgated thereunder.

"Associated Person" shall have the meaning ascribed to such term in the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder.

"Beneficial Ownership" shall have the meaning ascribed to such term in the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder.

"CCL Common Stock" shall mean the common stock, [$0.50] par value [with attached
Preferred Stock Purchase Rights] of CCL.

"CCL Distribution" shall mean the distribution by Corning to the Corning
shareholders of the CCL Common Stock.

"CCL Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which CCL (or any successor thereto) is the
common parent, excluding Covance and the other members of the Covance Group.

"CCL Rights Plan" shall mean the Preferred Share Purchase Rights Plan of CCL as
governed by the Rights Agreement, dated as of December 30, 1996, between CCL
and Harris Trust and Savings Bank, as Rights Agent.

"Code" shall mean the Internal Revenue Code of 1986, as amended, and the
Treasury regulations promulgated thereunder, including any comparable successor
legislation.

"Corning Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which Corning (or any successor thereto) is the
common parent, excluding for tax periods of the Corning Group commencing
subsequent to the Distribution Date, CCL and the other members of the CCL Group
and Covance and other members of the Covance Group.

<PAGE>

"Covance Common Stock" shall mean the common stock, [$0.50] par value [with
attached Preferred Stock Purchase Rights] of Covance.

"Covance Distribution" shall mean the distribution by CCL to the CCL
shareholders of the Covance Common Stock.

"Covance Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which Covance (or any successor thereto) is the
common parent.

"Covance Rights Plan" shall mean the Preferred Share Purchase Rights Plan of 
Covance as governed by the Rights Agreement, dated as of December 31, 1996, 
between Covance and Harris Trust and Savings Bank, as Rights Agent.

"Distributions" shall mean the each of the CCL Distribution and the Covance
Distribution, including any transfers relating to the CCL Distribution or the
Covance Distribution.

"Distribution Date" shall mean such date as has been or hereafter will be
determined by Corning's Board of Directors as the date as of which the
Distributions shall be effected.

"Gross Assets" shall mean, when used with respect to a specified Person, the
fair market value of such Person's assets unencumbered by any liabilities.

"Group" shall have the meaning ascribed to such term in the Securities Exchange
Act of 1934, as amended, and the rules and regulations promulgated thereunder.

"IRS" shall mean the U.S. Internal Revenue Service.

"IRS Penalty Rate" shall mean the rate of interest imposed from time to time on
underpayments of income tax pursuant to Code section 6621.

"IRS Ruling" shall mean the private letter ruling (together with any
supplements) issued by the IRS in respect of the Ruling Request.

"Opinion of Counsel" shall mean an opinion of independent tax counsel of
recognized national standing and experienced in the issues to be addressed and
otherwise reasonably acceptable to Corning, which sets forth an Unqualified Tax
Opinion in form and substance satisfactory to Corning. In no event shall Corning
be required to conclude that an opinion is satisfactory if there is any risk,
however remote, that the transaction which is the subject of the opinion will
cause either of the Distributions to be taxable to any extent under the Code.

"Other Transactions" shall mean the transactions related to the Distributions
and described in Parts I through IV of the Ruling Request.

                                       2

<PAGE>

"Person" shall mean any natural person, corporation, business trust, joint
venture, association, company, partnership or government, or any agency or
political subdivision thereof.

"Restricted Period" shall mean the two year period following the Distribution
Date.

"Ruling Period" shall mean the period commencing on the Distribution Date and
ending on the later of (i) the third anniversary of the close of the taxable
year of Corning in which the Distributions occur, and (ii) the first anniversary
of the date on which there shall have expired all statutes of limitations in
respect of taxable periods for which Taxes might be imposed or otherwise
assessed in respect of the Distributions and the Other Transactions.

"Ruling Request" shall mean the request for rulings, as amended and
supplemented, under Section 355 of the Code, as filed on behalf of Corning on
June 17, 1996, in respect of the Distributions.

"Taxes" shall mean all federal, state, local and foreign gross or net income,
gross receipts, withholding, franchise, transfer, estimated or other taxes or
similar charges and assessments, including all interest, penalties and additions
imposed with respect to such amounts.

"Unqualified Tax Opinion" shall mean (a) an unqualified "will" opinion of tax
counsel to the effect that a transaction does not disqualify either of the
Distributions from qualifying for tax-free treatment for the shareholders of
Corning and CCL and any member of the Corning Group and the CCL Group under Code
section 355 and any other applicable sections of the Code, assuming that the
Distributions would have qualified for tax-free treatment if such transaction
did not occur. An Unqualified Tax Opinion may rely upon, and assume the accuracy
of, any representations contained in any application for a letter ruling from
the IRS, and any representations contained in an officer's certificate delivered
by an officer of Corning, CCL or Covance to such counsel.

                                       3



                 Covance/CCL SPIN-OFF TAX INDEMNIFICATION AGREEMENT

                  This SPIN-OFF TAX INDEMNIFICATION AGREEMENT ("Agreement") is
made and entered into this 16th day of December, 1996, by and among COVANCE 
INC., a Delaware corporation ("Covance") and CORNING CLINICAL LABORATORIES INC.,
a Delaware corporation ("CCL").

                                   WITNESSETH

                  WHEREAS, Corning Incorporated, a New York corporation
("Corning"), is the common parent of an affiliated group of corporations within
the meaning of Code1 Section 1504 which includes Covance and CCL;

                  WHEREAS, Corning has determined to effect the Distributions
pursuant to a Transaction Agreement (the "Transaction Agreement") dated of even
date herewith;

                  WHEREAS, the IRS has issued the IRS Ruling which states the
tax treatment of the Distributions and the Other Transactions; and

                  WHEREAS, the parties hereto are entering into this Agreement
to indemnify Covance as hereinafter provided in the event the Covance
Distribution or the Other Transactions fail to qualify for the tax treatment
stated in the IRS Ruling due to actions by CCL.

                  NOW, THEREFORE, in consideration of the mutual agreements,
provisions and covenants contained in this Agreement, the parties hereby agree
as follows:

                    ARTICLE 1: Representations and Covenants

                  SECTION 1.01. Representations. (a) CCL has reviewed the
materials submitted to the IRS in connection with the IRS Ruling and, to the
best of CCL's knowledge, these materials, including, without limitation, any
statements and representations concerning CCL, its business, operations capital
structure and/or organization, are complete and accurate in all material
respects. CCL shall, and shall cause each member of the CCL Group, to comply
with each such representation and statement concerning CCL and the CCL Group
made in the materials so submitted, the IRS Ruling and any subsequent IRS
ruling, including without limitation, statements as to the creation, funding and
operation of employee

- --------
1 Capitalized terms not defined herein have the meaning given to them in Annex
A.

<PAGE>

compensation plans by CCL. With respect to any representation or statement made
by or on behalf of CCL in connection with the IRS Ruling and any subsequent IRS
ruling and to the extent such representation or statement relates to future
actions or events under their control, neither CCL nor any member of the CCL
Group will take any action during the Restricted Period that would have caused
such representation or statement to be untrue if CCL had planned or intended to
take such action at the time such representation or statement was made by or on
behalf of CCL.

                  (b) CCL hereby represents and warrants to Covance that CCL has
no present intention to undertake any of the transactions set forth in Section
1.02 (a) (iii) or to cease to engage in the active conduct of the trade or
business (within the meaning of Section 355(b)(2) of the Code) of providing
clinical laboratory testing services.

                  SECTION 1.02. Covenants. (a) CCL covenants and agrees with
Covance that during the Restricted Period:

                  (i) CCL will continue to engage in the clinical laboratory
testing business in the U.S. and will continue to maintain in the U.S. a
substantial portion of its assets and business operations as they existed prior
to the Distributions, provided that the foregoing shall not be deemed to
prohibit CCL from entering into or acquiring other businesses or operations
which may or may not be consistent with its business and operations as they
existed prior to the Distributions so long as CCL continues to engage in such
clinical business in the U.S. and continues to so maintain such substantial
portion in the U.S.;

                  (ii) CCL will continue to manage and to own (A) directly
assets which represent at least fifty percent (50%) of the Gross Assets which
CCL managed and owned directly immediately after the Distributions, and (B)
directly or indirectly through one or more entities, assets which represent at
least 50% of the Gross Assets which CCL owned indirectly through one or more
entities immediately after the Distributions;

                  (iii) except as provided in Section 1.02(c), neither CCL, nor
any of its Affiliates nor any of their respective, directors, officers or other
representatives will undertake, authorize, approve, recommend, permit,
facilitate, or enter into any contract, or consummate any transaction with
respect to: (A) the issuance of CCL Common Stock (including options, warrants,
rights or securities exercisable for, or convertible into, CCL Common Stock) in
a single transaction or in a series of related or unrelated transactions or
otherwise or in the aggregate which would exceed (or could exceed if any such
options, warrants or rights were exercised or such securities were converted)
fifty percent (50%) when expressed as a percentage of the outstanding shares of
CCL Common Stock immediately following the Distributions; (B) the issuance of
any class or series of capital stock or any other instrument (other than CCL
Common Stock and options, warrants, rights or securities exercisable for, or
convertible into, CCL Common Stock) that would constitute equity for federal tax
purposes (such classes or series of capital stock and other instruments being
referred to herein as

                                       2

<PAGE>

"Disqualified CCL Stock"); (C) the issuance of any options, rights, warrants,
securities or similar arrangements exercisable for, or convertible into,
Disqualified CCL Stock; (D) any redemptions, repurchases or other acquisitions
of capital stock or other equity interests in CCL in a single transaction or a
series of related or unrelated transactions, unless such redemptions,
repurchases or other acquisitions (1) satisfy the following requirements: (a)
there is a "sufficient business purpose" (within the meaning of Section
4.05(1)(b) of Revenue Procedure 96-30) for the transaction, (b) the stock to be
purchased, redeemed or otherwise acquired is widely held, (c) the stock
purchases or other acquisitions will be made on the open market, and (d) the
amount of stock purchases, redemption, or other acquisitions in a single
transaction or in a series of related or unrelated transactions will not exceed
an amount of stock representing twenty percent (20%) of the outstanding stock of
CCL immediately following the Distributions; or (2) are made in connection with
employee equity compensation plans of CCL and do not result, individually or in
the aggregate, in the acquisition of more than ten percent (10%) of the voting
power in respect of the outstanding stock of CCL immediately following the
Distributions, (E) the dissolution, merger , or complete or partial liquidation
of CCL or any announcement of such action; or (F) the waiver, amendment,
termination or modification of any provision of the CCL Rights Plan in
connection with, or in order to permit or facilitate, any acquisition or
proposed acquisition of Beneficial Ownership of capital stock or other equity
interest in CCL.

                  (b) Following the six-month anniversary of the Distribution
Date, CCL and its Affiliates may take any action or engage in conduct otherwise
prohibited by Section 1.02 so long as prior to such action or conduct, as the
case may be, Corning or CCL receives (A) a ruling from the IRS in form and
substance reasonably satisfactory to Corning to the effect that the proposed
action or conduct, as the case may be, will not cause the Covance Distribution
or the Other Transactions to fail to qualify for the tax treatment stated in the
IRS Ruling or otherwise to be taxable for federal income tax purposes, or (B) an
Opinion of Counsel in form and substance reasonably satisfactory to Corning to
the effect that the proposed action or conduct, as the case may be, will not
cause the Covance Distribution or the Other Transactions to fail to qualify for
the tax treatment stated in the IRS Ruling or otherwise to be taxable for
federal income tax purposes.

                      ARTICLE 2: CCL Indemnity Obligations

                  SECTION 2.01. Tax Indemnities. (a) If CCL, or another member
of the CCL Group (collectively the "Indemnifying Party") shall take any action
prohibited by Article 1 or shall violate a representation or covenant contained
in Article 1, and the Covance Distribution or any of the Other Transactions
shall fail to qualify for the tax treatment stated in the IRS Ruling primarily
as a result of such action or violation, then the Indemnifying Party shall
(jointly or severally) indemnify and hold harmless Covance and each member of
the Covance Group (collectively the "Indemnified Party") against any and all
Taxes imposed upon or incurred by the Indemnified Party as a result of the
failure, including, without limitation, any liability of the

                                       3

<PAGE>

Indemnified Party arising from Taxes imposed on shareholders of Covance to the
extent any shareholder or shareholders of Covance successfully seek recourse
against the Indemnified Party on account of any such failure, or any liability
for such Taxes which the Indemnified Party may assume or otherwise provide for.

                  (b) Notwithstanding anything to the contrary set forth in this
Agreement, if, during the Restricted Period, any Person or Group of Affiliated
Persons or Associated Persons acquires Beneficial Ownership of twenty percent
(20%) or more of CCL Common Stock (or any other class of outstanding CCL stock)
or commences a tender or other purchase offer for the capital stock of CCL upon
consummation of which such Person or Group of Affiliated Persons or Associated
Persons would acquire Beneficial Ownership of twenty percent (20%) or more of
the CCL Common Stock (or any other class of outstanding CCL stock) and the
Covance Distribution or any of the Other Transactions shall fail to qualify for
the tax treatment stated in the IRS Ruling primarily as a result of such
acquisition or tender or other purchase offer; then the Indemnifying Party shall
indemnify and hold harmless the Indemnified Party against any and all Taxes
imposed upon or incurred by the Indemnified Party and/or its shareholders as a
result of the failure of either Distribution or the Other Transactions to so
qualify.

                  (c) The Indemnified Party shall be indemnified and held 
harmless under Section 2.01(a) without regard to the fact that the Indemnified
Party may have received a supplemental ruling from the IRS or an Opinion of
Counsel as contemplated by Section 1.02(c). The Indemnified Party shall be
indemnified and held harmless under Section 2.01(b) without regard to whether an
acquisition of Beneficial Ownership results from a transaction which is not
prohibited under Article 1.

                   ARTICLE 3: Calculation of Indemnity Amounts

                  SECTION 3.01. Amount of Indemnified Liability. The amount
indemnified against under Article 2 ("Indemnified Liability") for a tax based on
or determined with reference to income shall be deemed to be the amount of the
tax computed by multiplying (i) the taxing jurisdiction's highest marginal tax
rate applicable to taxable income of corporations such as the Indemnified Party
on income of the character subject to tax and indemnified against under Article
2 for the taxable period in which the Distributions occur, times (ii) the gain
or income of the Indemnified Party which is subject to tax in the taxing
jurisdiction and indemnified against under Article 2. In the case of an
Indemnified Liability attributable to a payment owed to a shareholder or
shareholders of Covance, the amount of the Indemnified Liability shall be equal
to the amount so owed, including without limitation, interest, costs, additions,
expenses and penalties. All amounts payable under this Agreement shall be paid
on an after-tax basis. If an Indemnified Liability is of a type that constitutes
a deduction from income in any taxable period in determining the Indemnified
Party's liability for a tax based upon or determined with reference to income,
the amount of the Indemnified Liability shall be reduced by the reduction in the
tax liability of the Indemnified Party.

                                       4

<PAGE>

                         ARTICLE 4: Procedural Matters

                  SECTION 4.01. General. (a) If either the Indemnified Party or
the Indemnifying Party receives any written notice of deficiency, claim or
adjustment or any other written communication from a taxing authority that may
result in an Indemnified Liability, the party receiving such notice or
communication shall promptly give written notice thereof to the other party,
provided that any delay by the Indemnified Party in so notifying an Indemnifying
Party shall not relieve the Indemnifying Party of any liability hereunder,
except to the extent (i) such delay restricts the ability of the Indemnifying
Party to contest the resulting Indemnified Liability administratively or in the
courts in accordance with Section 4.02 and (ii) the Indemnifying Party is
materially and adversely prejudiced by such delay.

                  (b) The parties hereto undertake and agree that from and after
such time as they obtain knowledge that any representative of a taxing authority
has begun to investigate or inquire into either Distribution or any of the Other
Transactions (whether or not such investigation or inquiry is a formal or
informal investigation or inquiry), the party obtaining such knowledge shall (i)
notify the other party thereof, provided that any delay by the Indemnified Party
in so notifying the Indemnifying Party shall not relieve the Indemnifying Party
of any liability hereunder (except to the extent (A) such delay restricts the
ability of the Indemnifying Party to contest the resulting Indemnified Liability
administratively or in the courts in accordance with Section 4.02 and (B) the
Indemnifying Party is materially and adversely prejudiced by such delay), (ii)
consult with the other party from time to time as to the conduct of such
investigation or inquiry, (iii) provide the other party with copies of all
correspondence with such taxing authority or any representative thereof
pertaining to such investigation or inquiry, and (iv) arrange for a
representative of the other party to be present at all meetings with such taxing
authority or any representative thereof pertaining to such investigation or
inquiry.

                  SECTION 4.02. Contests. (a) Provided that (i) the Indemnifying
Party shall furnish the Indemnified Party with evidence reasonably satisfactory
to the Indemnified Party of its ability to pay the full amount of the
Indemnified Liability and (ii) the Indemnifying Party acknowledges in writing
that the asserted liability is an Indemnified Liability, the Indemnifying Party
shall assume and direct the defense or settlement of any hearing, arbitration,
suit or other proceeding (each a "Proceeding") commenced, filed or otherwise
initiated or convened to investigate or resolve the existence and extent of such
liability.

                  (b) If the Indemnified Liability is grouped with other
unrelated asserted liabilities or issues in the Proceeding, the parties shall
use their respective best efforts to cause the Indemnified Liability to be the
subject of a separate proceeding. If such severance is not possible, the
Indemnifying Party shall assume and direct and be responsible only for the
matters relating to the Indemnified Liability.

                                       5

<PAGE>

                  (c) If at any time during a Proceeding controlled by the
Indemnifying Party pursuant to Section 4.02(a) the Indemnifying Party fails to
provide evidence reasonably satisfactory to the Indemnified Party of its ability
to pay the full amount of the Indemnified Liability or the Indemnified Party
reasonably determines, after due investigation, that the Indemnifying Party
could not pay the full amount of the Indemnified Liability, then the Indemnified
Party may assume control of the Proceedings upon seven (7) days written notice.

                  (d) The Indemnifying Party shall pay all out-of-pocket
expenses and other costs related to the Indemnified Liability, including but not
limited to fees for attorneys, accountants, expert witnesses or other
consultants retained by the Indemnifying Party and/or the Indemnified Party,
other than fees for attorneys, accountants, expert witnesses or other
consultants retained solely by the Indemnified Party and incurred at any time
during which the Indemnifying Party is controlling and directing the Proceeding
in respect of which such fees are incurred. To the extent that any such expenses
and other costs have been or are paid by an Indemnified Party, the Indemnifying
Party shall promptly reimburse the Indemnified Party therefor.

                  (e) The Indemnifying Party shall not pay (unless otherwise
required by a proper notice of levy and after prompt notification to the
Indemnified Party of receipt of notice and demand for payment), settle,
compromise or conceded any portion of the Indemnified Liability without the
written consent of the Indemnified Party, which consent shall not be
unreasonably withheld. The Indemnifying Party shall, on a timely basis, keep the
Indemnified Party informed of all developments in the Proceeding and provide the
Indemnified Party with copies of all pleadings, briefs, orders, and other
written papers.

                  (f) Any Proceeding which is not controlled or which is no
longer controlled by the Indemnifying Party pursuant to Section 4.02 shall be
controlled and directed exclusively by the Indemnified Party, and any related
out-of-pocket expenses and other costs incurred by the Indemnified Party,
including but not limited to, fees for attorneys, accountants, expert witnesses
or other consultants, shall be reimbursed by the Indemnifying Party. The
Indemnified Party will not be required to pursue the claim in the federal
district court, Court of Claims or any state court if as a prerequisite to such
Court's jurisdiction, the Indemnified Party is required to pay the asserted
liability unless the funds necessary to invoke such jurisdiction are provided by
the Indemnifying Party.

                  SECTION 4.03. Time and Manner of Payment. The Indemnifying
Party shall pay to the Indemnified Party the amount of the Indemnified Liability
and any expenses or other costs indemnified against (less any amount paid
directly by the Indemnifying Party to the taxing authority) no less than (7)
business days prior to the date payment of the Indemnified Liability is to be
made by any party to the taxing authority. Such payment shall be paid by wire
transfer of immediately available funds to an account designated by the
Indemnified Party by written notice to the Indemnifying Party prior to the due
date of such payment. If the Indemnifying Party delays making payment beyond the
due date hereunder, such party shall

                                       6

<PAGE>

pay interest on the amount unpaid at the IRS Penalty Rate for each day and the
actual number of days for which any amount due hereunder is unpaid.

                  SECTION 4.04. Refunds. In connection with this Agreement,
should an Indemnified Party receive a refund in respect of amounts paid by an
Indemnifying Party to any taxing authority on its behalf, or should any such
amounts that would otherwise be refundable to the Indemnifying Party be applied
by the taxing authority to obligations of the Indemnified Party unrelated to an
Indemnified Liability, then such Indemnified Party shall, promptly following
receipt (or notification of credit), remit such refund and any related interest
to the Indemnifying Party.

                  SECTION 4.05. Cooperation. The parties shall cooperate with
one another in a timely manner in any administrative or judicial proceeding
involving any matter that may result in an Indemnified Liability.

                          ARTICLE 5: General Provisions

                  SECTION 5.01. Notices. All notices, requests, claims and other
communications hereunder shall be in writing and shall be given or made (and
shall be deemed to have been duly given or made upon receipt) by delivery in
person, by courier service, by cable, by telecopy, by telegram, by telex or by
registered or certified mail (postage prepaid, return receipt requested) to the
respective parties at the addresses (or at such other address for a party as
shall be specified in a notice given in accordance with this Section 5.01)
listed below:

                  To Covance:
                           210 Carnegie Center
                           Princeton, New Jersey  08540
                           Telecopy:
                           Attn: General Counsel

                  To CCL:
                           One Malcolm Avenue
                           Teterboro, New Jersey 07608-1070210
                           Telecopy:
                           Attn: General Counsel

                  SECTION 5.02. Miscellaneous. This Agreement, including the
attachments, shall constitute the entire agreement between the parties hereto
with respect to the subject matter hereof and shall supersede all prior
agreements and undertakings, both written and oral, between the parties with
respect to the subject matter hereof and thereof. This Agreement may be executed
in one or more counterparts, and by the different parties hereto in separate
counterparts, each of which when executed shall be deemed to be an original but
all of which

                                       7

<PAGE>

taken together shall constitute one and the same agreement. This Agreement may
not be amended or modified except (a) by an instrument in writing signed by, or
on behalf of, the parties or (b) by a waiver in accordance with Section 5.03.
This Agreement shall be binding upon and inure solely to the benefit of the
parties hereto and their respective subsidiaries, and nothing herein, express or
implied, is intended to or shall confer upon any third parties any legal or
equitable right, benefit or remedy of any nature whatsoever under or by reason
of this Agreement.

                  SECTION 5.03. Waiver. The parties to this Agreement may (a)
extend the time for the performance of any of the obligations or other acts of
the other party or parties, (b) waive any inaccuracies in the representations
and warranties of the other party or parties contained herein or in any document
delivered by the other party or parties pursuant hereto or (c) waive compliance
with any of the agreements or conditions of the other party or parties contained
herein. Any such extension or waiver shall be valid only if set forth in an
instrument in writing signed by the party to be bound thereby. Any waiver of any
term or condition shall not be construed as a waiver of any subsequent breach or
a subsequent waiver of the same term or condition, or a waiver of any other term
or condition, of this Agreement. The failure of any party to assert any of its
rights hereunder shall not constitute a waiver of any such rights.

                  SECTION 5.04. Successors and Assigns. The provisions of this
Agreement shall be binding upon, inure to the benefit of and be enforceable by
the parties and their respective successors and permitted assigns.
Notwithstanding the previous sentence, CCL shall not assign this Agreement or
any rights, interests or obligations hereunder, or delegate performance of any
of its obligations hereunder, without the consent of Covance.

                  SECTION 5.05. Specific Performance. The parties hereto agree
that irreparable damage would occur in the event any provision of this Agreement
was not performed in accordance with the terms hereof and that the parties shall
be entitled to specific performance of the terms hereof, in addition to any
other remedy at law or equity.

                  SECTION 5.06. Governing Law and Severability. This Agreement
shall be governed by, and construed in accordance with, the laws of the State of
New York, applicable to contracts executed in and to be performed entirely
within that state. If any term or other provision of this Agreement is invalid,
illegal or incapable of being enforced by any law or public policy, all other
terms and provisions of this Agreement shall nevertheless remain in full force
and effect so long as the economic or legal substance of the transactions
contemplated hereby is not affected in any manner materially adverse to any
party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in an acceptable manner in order that the
transactions contemplated hereby are consummated as originally contemplated to
the greatest extent possible.

                                       8

<PAGE>

         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed as of the date first written above by their respective officers
thereunto duly authorized.

CORNING PHARMACEUTICAL                      CORNING CLINICAL
   SERVICES                                    LABORATORIES INC.

By  /s/  Jeffrey S. Hurtz                    By /s/ Leo C. Farrenkopf, Jr.
  ----------------------------                 ---------------------------
  Name:  Jeffrey S. Hurtz                      Name:
  Title:                                       Title:




                                       9

<PAGE>


                                     ANNEX A
                                   DEFINITIONS

"Affiliate" shall mean, when used with respect to a specified Person, another
Person that directly, or indirectly through one or more intermediaries, controls
or is controlled by or is under common control with such Person.

"Affiliated Person" shall have the meaning ascribed to such term in the
Investment Company Act of 1940, as amended, and the rules and regulations
promulgated thereunder.

"Associated Person" shall have the meaning ascribed to such term in the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder.

"Beneficial Ownership" shall have the meaning ascribed to such term in the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder.

"CCL Common Stock" shall mean the common stock, [$0.50] par value [with attached
Preferred Stock Purchase Rights] of CCL.

"CCL Distribution" shall mean the distribution by Corning to the Corning
shareholders of the CCL Common Stock.

"CCL Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which CCL (or any successor thereto) is the
common parent, excluding Covance and the other members of the Covance Group.

"CCL Rights Plan" shall mean the Preferred Share Purchase Rights Plan of CCL as
governed by the Rights Agreement, dated as of December 30, 1996, between CCL
and Harris Trust and Savings Bank, as Rights Agent.

"Code" shall mean the Internal Revenue Code of 1986, as amended, and the
Treasury regulations promulgated thereunder, including any comparable successor
legislation.

"Corning Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which Corning (or any successor thereto) is the
common parent, excluding for tax periods of the Corning Group commencing
subsequent to the Distribution Date, CCL and the other members of the CCL Group
and Covance and other members of the Covance Group.

<PAGE>

"Covance Common Stock" shall mean the common stock, [$0.50] par value [with
attached Preferred Stock Purchase Rights] of Covance.

"Covance Distribution" shall mean the distribution by CCL to the CCL
shareholders of the Covance Common Stock.

"Covance Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which Covance (or any successor thereto) is the
common parent.

"Covance Rights Plan" shall mean the Preferred Share Purchase Rights Plan of
Covance as governed by the Rights Agreement, dated as of December 31, 1996,
between Covance and Harris Trust and Savings Bank, as Rights Agent.

"Distributions" shall mean the each of the CCL Distribution and the Covance
Distribution, including any transfers relating to the CCL Distribution or the
Covance Distribution.

"Distribution Date" shall mean such date as has been or hereafter will be
determined by Corning's Board of Directors as the date as of which the
Distributions shall be effected.

"Gross Assets" shall mean, when used with respect to a specified Person, the
fair market value of such Person's assets unencumbered by any liabilities.

"Group" shall have the meaning ascribed to such term in the Securities Exchange
Act of 1934, as amended, and the rules and regulations promulgated thereunder.

"IRS" shall mean the U.S. Internal Revenue Service.

"IRS Penalty Rate" shall mean the rate of interest imposed from time to time on
underpayments of income tax pursuant to Code section 6621.

"IRS Ruling" shall mean the private letter ruling (together with any
supplements) issued by the IRS in respect of the Ruling Request.

"Opinion of Counsel" shall mean an opinion of independent tax counsel of
recognized national standing and experienced in the issues to be addressed and
otherwise reasonably acceptable to Corning, which sets forth an Unqualified Tax
Opinion in form and substance satisfactory to Corning. In no event shall Corning
be required to conclude that an opinion is satisfactory if there is any risk,
however remote, that the transaction which is the subject of the opinion will
cause either of the Distributions to be taxable to any extent under the Code.

"Other Transactions" shall mean the transactions related to the Distributions
and described in Parts I through IV of the Ruling Request.

                                       2

<PAGE>

"Person" shall mean any natural person, corporation, business trust, joint
venture, association, company, partnership or government, or any agency or
political subdivision thereof.

"Restricted Period" shall mean the two year period following the Distribution
Date.

"Ruling Period" shall mean the period commencing on the Distribution Date and
ending on the later of (i) the third anniversary of the close of the taxable
year of Corning in which the Distributions occur, and (ii) the first anniversary
of the date on which there shall have expired all statutes of limitations in
respect of taxable periods for which Taxes might be imposed or otherwise
assessed in respect of the Distributions and the Other Transactions.

"Ruling Request" shall mean the request for rulings, as amended and
supplemented, under Section 355 of the Code, as filed on behalf of Corning on
June 17, 1996, in respect of the Distributions.

"Taxes" shall mean all federal, state, local and foreign gross or net income,
gross receipts, withholding, franchise, transfer, estimated or other taxes or
similar charges and assessments, including all interest, penalties and additions
imposed with respect to such amounts.

"Unqualified Tax Opinion" shall mean (a) an unqualified "will" opinion of tax
counsel to the effect that a transaction does not disqualify either of the
Distributions from qualifying for tax-free treatment for the shareholders of
Corning and CCL and any member of the Corning Group and the CCL Group under Code
section 355 and any other applicable sections of the Code, assuming that the
Distributions would have qualified for tax-free treatment if such transaction
did not occur. An Unqualified Tax Opinion may rely upon, and assume the accuracy
of, any representations contained in any application for a letter ruling from
the IRS, and any representations contained in an officer's certificate delivered
by an officer of Corning, CCL or Covance to such counsel.

                                       3



                 CCL/Covance SPIN-OFF TAX INDEMNIFICATION AGREEMENT

                  This SPIN-OFF TAX INDEMNIFICATION AGREEMENT ("Agreement") is
made and entered into this 16th day of December, 1996, by and among CORNING
CLINICAL LABORATORIES INC., a Delaware corporation ("CCL") and COVANCE INC.,
a Delaware corporation ("Covance").

                                   WITNESSETH

                  WHEREAS, Corning Incorporated, a New York corporation
("Corning") is the common parent of an affiliated group of corporations within
the meaning of Code1 Section 1504 which includes Covance;

                  WHEREAS, Corning has determined to effect the Distributions
pursuant to a Transaction Agreement (the "Transaction Agreement") dated of even
date herewith;

                  WHEREAS, the IRS has issued the IRS Ruling which states the
tax treatment of the Distributions and the Other Transactions; and

                  WHEREAS, the parties hereto are entering into this Agreement
to indemnify CCL as hereinafter provided in the event the Distributions or the
Other Transactions fail to qualify for the tax treatment stated in the IRS
Ruling due to actions by Covance.

                  NOW, THEREFORE, in consideration of the mutual agreements,
provisions and covenants contained in this Agreement, the parties hereby agree
as follows:

                    ARTICLE 1: Representations and Covenants

                  SECTION 1.01. Representations. (a) Covance has reviewed the
materials submitted to the IRS in connection with the IRS Ruling and, to the
best of Covance's knowledge, these materials, including, without limitation, any
statements and representations concerning Covance, its business, operations
capital structure and/or organization, are complete and accurate in all material
respects. Covance shall, and shall cause each member of the Covance Group, to
comply with each such representation and statement concerning Covance and the
Covance Group made in the materials so submitted, the IRS Ruling and any
subsequent IRS ruling, including without limitation, statements as to the
creation, funding and operation of employee compensation

- --------

1 Capitalized terms not defined herein have the meaning given to them in Annex
A.

<PAGE>

plans by Covance. With respect to any representation or statement made by or on
behalf of Covance in connection with the IRS Ruling and any subsequent IRS
ruling and to the extent such representation or statement relates to future
actions or events under their control, neither Covance nor any member of the
Covance Group will take any action during the Restricted Period that would have
caused such representation or statement to be untrue if Covance had planned or
intended to take such action at the time such representation or statement was
made by or on behalf of Covance.

                  (b) Covance hereby represents and warrants to CCL that Covance
has no present intention to undertake any of the transactions set forth in
Section 1.02 (a) (iii) or to cease to engage in the active conduct of the trade
or business (within the meaning of Section 355(b)(2) of the Code) of providing
pharmaceutical services.

                  SECTION 1.02. Covenants. (a) Covance covenants and agrees with
CCL that during the Restricted Period:

                  (i) Covance will continue to engage in the pharmaceutical
services business in the U.S. and will continue to maintain in the U.S. a
substantial portion of its assets and business operations as they existed prior
to the Distributions, provided that the foregoing shall not be deemed to
prohibit Covance from entering into or acquiring other businesses or operations
which may or may not be consistent with its business and operations as they
existed prior to the Distributions so long as Covance continues to engage in
such pharmaceutical services business in the U.S. and continues to so maintain
such substantial portion in the U.S.;

                  (ii) Covance will continue to manage and to own (A) directly
assets which represent at least fifty percent (50%) of the Gross Assets which
Covance managed and owned directly immediately after the Distributions, and (B)
directly or indirectly through one or more entities, assets which represent at
least 50% of the Gross Assets which Covance owned indirectly through one or more
entities immediately after the Distributions;

                  (iii) except as provided in Section 1.02(c), neither Covance, 
nor any of its Affiliates nor any of their respective, directors, officers or
other representatives will undertake, authorize, approve, recommend, permit,
facilitate, or enter into any contract, or consummate any transaction with
respect to: (A) the issuance of Covance Common Stock (including options,
warrants, rights or securities exercisable for, or convertible into, Covance
Common Stock) in a single transaction or in a series of related or unrelated
transactions or otherwise or in the aggregate which would exceed (or could
exceed if any such options, warrants or rights were exercised or such securities
were converted) fifty percent (50%) when expressed as a percentage of the
outstanding shares of Covance Common Stock immediately following the
Distributions; (B) the issuance of any class or series of capital stock or any
other instrument (other than Covance Common Stock and options, warrants, rights
or securities exercisable for, or convertible into, Covance Common Stock) that
would constitute equity for federal tax purposes (such classes or series of
capital stock and other instruments being referred to herein as

                                       2

<PAGE>

"Disqualified Covance Stock"); (C) the issuance of any options, rights,
warrants, securities or similar arrangements exercisable for, or convertible
into, Disqualified Covance Stock; (D) any redemptions, repurchases or other
acquisitions of capital stock or other equity interests in Covance in a single
transaction or a series of related or unrelated transactions, unless such
redemptions, repurchases or other acquisitions (1) satisfy the following
requirements: (a) there is a "sufficient business purpose" (within the meaning
of Section 4.05(1)(b) of Revenue Procedure 96-30) for the transaction, (b) the
stock to be purchased, redeemed or otherwise acquired is widely held, (c) the
stock purchases or other acquisitions will be made on the open market, and (d)
the amount of stock purchases, redemption, or other acquisitions in a single
transaction or in a series of related or unrelated transactions will not exceed
an amount of stock representing twenty percent (20%) of the outstanding stock of
Covance immediately following the Distributions; or (2) are made in connection
with employee equity compensation plans of Covance and do not result,
individually or in the aggregate, in the acquisition of more than ten percent
(10%) of the voting power in respect of the outstanding stock of Covance
immediately following the Distributions, (E) the dissolution, merger , or
complete or partial liquidation of Covance or any announcement of such action;
or (F) the waiver, amendment, termination or modification of any provision of
the Covance Rights Plan in connection with, or in order to permit or facilitate,
any acquisition or proposed acquisition of Beneficial Ownership of capital stock
or other equity interest in Covance.

                  (b) In addition to the other representations, warranties,
covenants and agreements set forth in this Agreement, Covance and the Covance
Group will take, or refrain from taking, as the case may be, such actions as CCL
may reasonably request during the Ruling Period as necessary to insure that the
Distributions and the Other Transactions qualify for the tax treatment stated in
the IRS Ruling, including, without limitation, such actions as CCL determines
may be necessary to obtain and preserve the IRS Ruling or any subsequent IRS
ruling on which the parties can rely. Without limiting the generality of the
foregoing, Covance and the Covance Group shall cooperate with CCL if CCL
determines to obtain additional IRS rulings pertaining to whether any actual or
proposed change in facts and circumstances affects the tax status of the
Distributions or the Other Transactions.

                  (c) Following the six-month anniversary of the Distribution
Date, Covance and its Affiliates may take any action or engage in conduct
otherwise prohibited by Section 1.02 so long as prior to such action or conduct,
as the case may be, CCL or Covance receives (A) a ruling from the IRS in form
and substance reasonably satisfactory to CCL and upon which CCL can rely to the
effect that the proposed action or conduct, as the case may be, will not cause
the Distributions or the Other Transactions to fail to qualify for the tax
treatment stated in the IRS Ruling or otherwise to be taxable for federal income
tax purposes, or (B) an Opinion of Counsel in form and substance reasonably
satisfactory to CCL and upon which CCL can rely to the effect that the proposed
action or conduct, as the case may be, will not cause the Distributions or the
Other Transactions to fail to qualify for the tax treatment stated in the IRS
Ruling or otherwise to be taxable for federal income tax purposes.

                                       3

<PAGE>

                      ARTICLE 2: Covance Indemnity Obligations

                  SECTION 2.01. Tax Indemnities. (a) If Covance, or another
member of the Covance Group (collectively the "Indemnifying Party") shall take
any action prohibited by Article 1 or shall violate a representation or covenant
contained in Article 1, and either of the Distributions or any of the Other
Transactions shall fail to qualify for the tax treatment stated in the IRS
Ruling primarily as a result of such action or violation, then the Indemnifying
Party shall (jointly or severally) indemnify and hold harmless CCL and each
member of the CCL Group (collectively the "Indemnified Party") against any and
all Taxes imposed upon or incurred by the Indemnified Party as a result of the
failure, including, without limitation, any liability of the Indemnified Party
arising from Taxes imposed on shareholders of CCL to the extent any shareholder
or shareholders of CCL successfully seek recourse against the Indemnified Party
on account of any such failure, or any liability for such Taxes which the
Indemnified Party may assume or otherwise provide for.

                  (b) Notwithstanding anything to the contrary set forth in this
Agreement, if, during the Restricted Period, any Person or Group of Affiliated
Persons or Associated Persons acquires Beneficial Ownership of twenty percent
(20%) or more of Covance Common Stock (or any other class of outstanding Covance
stock) or commences a tender or other purchase offer for the capital stock of
Covance upon consummation of which such Person or Group of Affiliated Persons or
Associated Persons would acquire Beneficial Ownership of twenty percent (20%) or
more of the Covance Common Stock (or any other class of outstanding Covance
stock) and either of the Distributions or any of the Other Transactions shall
fail to qualify for the tax treatment stated in the IRS Ruling primarily as a
result of such acquisition or tender or other purchase offer; then the
Indemnifying Party shall indemnify and hold harmless the Indemnified Party
against any and all Taxes imposed upon or incurred by the Indemnified Party
and/or its shareholders as a result of the failure of either Distribution or the
Other Transactions to so qualify.

                (c) The Indemnified Party shall be indemnified and held harmless
under Section 2.01(a) without regard to the fact that the Indemnified Party may
have received a supplemental ruling from the IRS or an Opinion of Counsel as
contemplated by Section 1.02(c). The Indemnified Party shall be indemnified and
held harmless under Section 2.01(b) without regard to whether an acquisition of
Beneficial Ownership results from a transaction which is not prohibited under
Article 1.

                                       4

<PAGE>

                   ARTICLE 3: Calculation of Indemnity Amounts

                  SECTION 3.01. Amount of Indemnified Liability. The amount
indemnified against under Article 2 ("Indemnified Liability") for a tax based on
or determined with reference to income shall be deemed to be the amount of the
tax computed by multiplying (i) the taxing jurisdiction's highest marginal tax
rate applicable to taxable income of corporations such as the Indemnified Party
on income of the character subject to tax and indemnified against under Article
2 for the taxable period in which the Distributions occur, times (ii) the gain
or income of the Indemnified Party which is subject to tax in the taxing
jurisdiction and indemnified against under Article 2. In the case of an
Indemnified Liability attributable to a payment owed to a shareholder or
shareholders of CCL, the amount of the Indemnified Liability shall be equal to
the amount so owed, including without limitation, interest, costs, additions,
expenses and penalties. All amounts payable under this Agreement shall be paid
on an after-tax basis. If an Indemnified Liability is of a type that constitutes
a deduction from income in any taxable period in determining the Indemnified
Party's liability for a tax based upon or determined with reference to income,
the amount of the Indemnified Liability shall be reduced by the reduction in the
tax liability of the Indemnified Party.

                          ARTICLE 4: Procedural Matters

                  SECTION 4.01. General. (a) If either the Indemnified Party or
the Indemnifying Party receives any written notice of deficiency, claim or
adjustment or any other written communication from a taxing authority that may
result in an Indemnified Liability, the party receiving such notice or
communication shall promptly give written notice thereof to the other party,
provided that any delay by the Indemnified Party in so notifying an Indemnifying
Party shall not relieve the Indemnifying Party of any liability hereunder,
except to the extent (i) such delay restricts the ability of the Indemnifying
Party to contest the resulting Indemnified Liability administratively or in the
courts in accordance with Section 4.02 and (ii) the Indemnifying Party is
materially and adversely prejudiced by such delay.

                  (b) The parties hereto undertake and agree that from and after
such time as they obtain knowledge that any representative of a taxing authority
has begun to investigate or inquire into either Distribution or any of the Other
Transactions (whether or not such investigation or inquiry is a formal or
informal investigation or inquiry), the party obtaining such knowledge shall (i)
notify the other party thereof, provided that any delay by the Indemnified Party
in so notifying the Indemnifying Party shall not relieve the Indemnifying Party
of any liability hereunder (except to the extent (A) such delay restricts the
ability of the Indemnifying Party to contest the resulting Indemnified Liability
administratively or in the courts in accordance with Section 4.02 and (B) the
Indemnifying Party is materially and adversely prejudiced by such delay), (ii)
consult with the other party from time to time as to the conduct of such
investigation or inquiry, (iii) provide the other party with copies of all
correspondence with such taxing authority or any representative thereof
pertaining to such investigation or inquiry, and (iv) arrange for a
representative of the other party to be present at

                                       5

<PAGE>

all meetings with such taxing authority or any representative thereof pertaining
to such investigation or inquiry.

                  SECTION 4.02. Contests. (a) Provided that (i) the Indemnifying
Party shall furnish the Indemnified Party with evidence reasonably satisfactory
to the Indemnified Party of its ability to pay the full amount of the
Indemnified Liability and (ii) the Indemnifying Party acknowledges in writing
that the asserted liability is an Indemnified Liability, the Indemnifying Party
shall assume and direct the defense or settlement of any hearing, arbitration,
suit or other proceeding (each a "Proceeding") commenced, filed or otherwise
initiated or convened to investigate or resolve the existence and extent of such
liability.

                  (b) If the Indemnified Liability is grouped with other
unrelated asserted liabilities or issues in the Proceeding, the parties shall
use their respective best efforts to cause the Indemnified Liability to be the
subject of a separate proceeding. If such severance is not possible, the
Indemnifying Party shall assume and direct and be responsible only for the
matters relating to the Indemnified Liability.

                  (c) If at any time during a Proceeding controlled by the
Indemnifying Party pursuant to Section 4.02(a) the Indemnifying Party fails to
provide evidence reasonably satisfactory to the Indemnified Party of its ability
to pay the full amount of the Indemnified Liability or the Indemnified Party
reasonably determines, after due investigation, that the Indemnifying Party
could not pay the full amount of the Indemnified Liability, then the Indemnified
Party may assume control of the Proceedings upon seven (7) days written notice.

                  (d) The Indemnifying Party shall pay all out-of-pocket
expenses and other costs related to the Indemnified Liability, including but not
limited to fees for attorneys, accountants, expert witnesses or other
consultants retained by the Indemnifying Party and/or the Indemnified Party,
other than fees for attorneys, accountants, expert witnesses or other
consultants retained solely by the Indemnified Party and incurred at any time
during which the Indemnifying Party is controlling and directing the Proceeding
in respect of which such fees are incurred. To the extent that any such expenses
and other costs have been or are paid by an Indemnified Party, the Indemnifying
Party shall promptly reimburse the Indemnified Party therefor.

                  (e) The Indemnifying Party shall not pay (unless otherwise
required by a proper notice of levy and after prompt notification to the
Indemnified Party of receipt of notice and demand for payment), settle,
compromise or conceded any portion of the Indemnified Liability without the
written consent of the Indemnified Party, which consent shall not be
unreasonably withheld. The Indemnifying Party shall, on a timely basis, keep the
Indemnified Party informed of all developments in the Proceeding and provide the
Indemnified Party with copies of all pleadings, briefs, orders, and other
written papers.

                                       6

<PAGE>

                  (f) Any Proceeding which is not controlled or which is no
longer controlled by the Indemnifying Party pursuant to Section 4.02 shall be
controlled and directed exclusively by the Indemnified Party, and any related
out-of-pocket expenses and other costs incurred by the Indemnified Party,
including but not limited to, fees for attorneys, accountants, expert witnesses
or other consultants, shall be reimbursed by the Indemnifying Party. The
Indemnified Party will not be required to pursue the claim in the federal
district court, Court of Claims or any state court if as a prerequisite to such
Court's jurisdiction, the Indemnified Party is required to pay the asserted
liability unless the funds necessary to invoke such jurisdiction are provided by
the Indemnifying Party.

                  SECTION 4.03. Time and Manner of Payment. The Indemnifying
Party shall pay to the Indemnified Party the amount of the Indemnified Liability
and any expenses or other costs indemnified against (less any amount paid
directly by the Indemnifying Party to the taxing authority) no less than (7)
business days prior to the date payment of the Indemnified Liability is to be
made by any party to the taxing authority. Such payment shall be paid by wire
transfer of immediately available funds to an account designated by the
Indemnified Party by written notice to the Indemnifying Party prior to the due
date of such payment. If the Indemnifying Party delays making payment beyond the
due date hereunder, such party shall pay interest on the amount unpaid at the
IRS Penalty Rate for each day and the actual number of days for which any amount
due hereunder is unpaid.

                  SECTION 4.04. Refunds. In connection with this Agreement,
should an Indemnified Party receive a refund in respect of amounts paid by an
Indemnifying Party to any taxing authority on its behalf, or should any such
amounts that would otherwise be refundable to the Indemnifying Party be applied
by the taxing authority to obligations of the Indemnified Party unrelated to an
Indemnified Liability, then such Indemnified Party shall, promptly following
receipt (or notification of credit), remit such refund and any related interest
to the Indemnifying Party.

                  SECTION 4.05. Cooperation. The parties shall cooperate with
one another in a timely manner in any administrative or judicial proceeding
involving any matter that may result in an Indemnified Liability.

                         ARTICLE 5: General Provisions

                  SECTION 5.01. Notices. All notices, requests, claims and other
communications hereunder shall be in writing and shall be given or made (and
shall be deemed to have been duly given or made upon receipt) by delivery in
person, by courier service, by cable, by telecopy, by telegram, by telex or by
registered or certified mail (postage prepaid, return receipt requested) to the
respective parties at the addresses (or at such other address for a party as
shall be specified in a notice given in accordance with this Section 5.01)
listed below:

                                       7

<PAGE>

                  To CCL:
                           One Malcolm Avenue
                           Teterboro, New Jersey  07608-1070210
                           Telecopy:
                           Attn: General Counsel

                  To Covance:
                           Carnegie Center
                           Princeton, New Jersey  08540-6233
                           Telecopy:
                           Attn: General Counsel

                  SECTION 5.02. Miscellaneous. This Agreement, including the
attachments, shall constitute the entire agreement between the parties hereto
with respect to the subject matter hereof and shall supersede all prior
agreements and undertakings, both written and oral, between the parties with
respect to the subject matter hereof and thereof. This Agreement may be executed
in one or more counterparts, and by the different parties hereto in separate
counterparts, each of which when executed shall be deemed to be an original but
all of which taken together shall constitute one and the same agreement. This
Agreement may not be amended or modified except (a) by an instrument in writing
signed by, or on behalf of, the parties or (b) by a waiver in accordance with
Section 5.03. This Agreement shall be binding upon and inure solely to the
benefit of the parties hereto and their respective subsidiaries, and nothing
herein, express or implied, is intended to or shall confer upon any third
parties any legal or equitable right, benefit or remedy of any nature whatsoever
under or by reason of this Agreement.

                  SECTION 5.03. Waiver. The parties to this Agreement may (a)
extend the time for the performance of any of the obligations or other acts of
the other party or parties, (b) waive any inaccuracies in the representations
and warranties of the other party or parties contained herein or in any document
delivered by the other party or parties pursuant hereto or (c) waive compliance
with any of the agreements or conditions of the other party or parties contained
herein. Any such extension or waiver shall be valid only if set forth in an
instrument in writing signed by the party to be bound thereby. Any waiver of any
term or condition shall not be construed as a waiver of any subsequent breach or
a subsequent waiver of the same term or condition, or a waiver of any other term
or condition, of this Agreement. The failure of any party to assert any of its
rights hereunder shall not constitute a waiver of any such rights.

                  SECTION 5.04. Successors and Assigns. The provisions of this
Agreement shall be binding upon, inure to the benefit of and be enforceable by
the parties and their respective successors and permitted assigns.
Notwithstanding the previous sentence, Covance shall not assign this Agreement 
or any rights, interests or obligations hereunder, or delegate performance of 
any of its obligations hereunder, without the consent of CCL.

                                       8

<PAGE>


                  SECTION 5.05. Specific Performance. The parties hereto agree
that irreparable damage would occur in the event any provision of this Agreement
was not performed in accordance with the terms hereof and that the parties shall
be entitled to specific performance of the terms hereof, in addition to any
other remedy at law or equity.

                  SECTION 5.06. Governing Law and Severability. This Agreement
shall be governed by, and construed in accordance with, the laws of the State of
New York, applicable to contracts executed in and to be performed entirely
within that state. If any term or other provision of this Agreement is invalid,
illegal or incapable of being enforced by any law or public policy, all other
terms and provisions of this Agreement shall nevertheless remain in full force
and effect so long as the economic or legal substance of the transactions
contemplated hereby is not affected in any manner materially adverse to any
party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in an acceptable manner in order that the
transactions contemplated hereby are consummated as originally contemplated to
the greatest extent possible.

         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed as of the date first written above by their respective officers
thereunto duly authorized.

CORNING CLINICAL
   LABORATORIES INC.                  COVANCE INC.

By /s/ Leo C. Farrenkopf, Jr.         By /s/ Jeffrey S. Hurwitz
   ---------------------------           --------------------------------
Name:  Leo C. Farrenkopf, Jr.            Name:  Jeffrey S. Hurwitz
Title: Vice President                    Title: Corporate Senior Vice President

<PAGE>


                                     ANNEX A
                                   DEFINITIONS

"Affiliate" shall mean, when used with respect to a specified Person, another
Person that directly, or indirectly through one or more intermediaries, controls
or is controlled by or is under common control with such Person.

"Affiliated Person" shall have the meaning ascribed to such term in the
Investment Company Act of 1940, as amended, and the rules and regulations
promulgated thereunder.

"Associated Person" shall have the meaning ascribed to such term in the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder.

"Beneficial Ownership" shall have the meaning ascribed to such term in the
Securities Exchange Act of 1934, as amended, and the rules and regulations
promulgated thereunder.

"CCL Common Stock" shall mean the common stock, [$0.50] par value [with attached
Preferred Stock Purchase Rights] of CCL.

"CCL Distribution" shall mean the distribution by Corning to the Corning
shareholders of the CCL Common Stock.

"CCL Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which CCL (or any successor thereto) is the
common parent, excluding Covance and the other members of the Covance Group.

"CCL Rights Plan" shall mean the Preferred Share Purchase Rights Plan of CCL as
governed by the Rights Agreement, dated as of December 30, 1996, between CCL 
and Harris Trust and Savings Bank, as Rights Agent.

"Code" shall mean the Internal Revenue Code of 1986, as amended, and the
Treasury regulations promulgated thereunder, including any comparable successor
legislation.

"Corning Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which Corning (or any successor thereto) is the
common parent, excluding for tax periods of the Corning Group commencing
subsequent to the Distribution Date, CCL and the other members of the CCL Group
and Covance and other members of the Covance Group.

<PAGE>

"Covance Common Stock" shall mean the common stock, [$0.50] par value [with
attached Preferred Stock Purchase Rights] of Covance.

"Covance Distribution" shall mean the distribution by CCL to the CCL
shareholders of the Covance Common Stock.

"Covance Group" shall mean the affiliated group of corporations as defined in
Section 1504(a) of the Code of which Covance (or any successor thereto) is the
common parent.

"Covance Rights Plan" shall mean the Preferred Share Purchase Rights Plan of
Covance as governed by the Rights Agreement, dated as of December 31, 1996,
between Covance and Harris Trust and Savings Bank, as Rights Agent.

"Distributions" shall mean the each of the CCL Distribution and the Covance
Distribution, including any transfers relating to the CCL Distribution or the
Covance Distribution.

"Distribution Date" shall mean such date as has been or hereafter will be
determined by Corning's Board of Directors as the date as of which the
Distributions shall be effected.

"Gross Assets" shall mean, when used with respect to a specified Person, the
fair market value of such Person's assets unencumbered by any liabilities.

"Group" shall have the meaning ascribed to such term in the Securities Exchange
Act of 1934, as amended, and the rules and regulations promulgated thereunder.

"IRS" shall mean the U.S. Internal Revenue Service.

"IRS Penalty Rate" shall mean the rate of interest imposed from time to time on
underpayments of income tax pursuant to Code section 6621.

"IRS Ruling" shall mean the private letter ruling (together with any
supplements) issued by the IRS in respect of the Ruling Request.

"Opinion of Counsel" shall mean an opinion of independent tax counsel of
recognized national standing and experienced in the issues to be addressed and
otherwise reasonably acceptable to Corning, which sets forth an Unqualified Tax
Opinion in form and substance satisfactory to Corning. In no event shall Corning
be required to conclude that an opinion is satisfactory if there is any risk,
however remote, that the transaction which is the subject of the opinion will
cause either of the Distributions to be taxable to any extent under the Code.

"Other Transactions" shall mean the transactions related to the Distributions
and described in Parts I through IV of the Ruling Request.

                                       2

<PAGE>

"Person" shall mean any natural person, corporation, business trust, joint
venture, association, company, partnership or government, or any agency or
political subdivision thereof.

"Restricted Period" shall mean the two year period following the Distribution
Date.

"Ruling Period" shall mean the period commencing on the Distribution Date and
ending on the later of (i) the third anniversary of the close of the taxable
year of Corning in which the Distributions occur, and (ii) the first anniversary
of the date on which there shall have expired all statutes of limitations in
respect of taxable periods for which Taxes might be imposed or otherwise
assessed in respect of the Distributions and the Other Transactions.

"Ruling Request" shall mean the request for rulings, as amended and
supplemented, under Section 355 of the Code, as filed on behalf of Corning on
June 17, 1996, in respect of the Distributions.

"Taxes" shall mean all federal, state, local and foreign gross or net income,
gross receipts, withholding, franchise, transfer, estimated or other taxes or
similar charges and assessments, including all interest, penalties and additions
imposed with respect to such amounts.

"Unqualified Tax Opinion" shall mean (a) an unqualified "will" opinion of tax
counsel to the effect that a transaction does not disqualify either of the
Distributions from qualifying for tax-free treatment for the shareholders of
Corning and CCL and any member of the Corning Group and the CCL Group under Code
section 355 and any other applicable sections of the Code, assuming that the
Distributions would have qualified for tax-free treatment if such transaction
did not occur. An Unqualified Tax Opinion may rely upon, and assume the accuracy
of, any representations contained in any application for a letter ruling from
the IRS, and any representations contained in an officer's certificate delivered
by an officer of Corning, CCL or Covance to such counsel.

                                       3





                                CREDIT AGREEMENT
                                      among
                                  COVANCE INC.
                                  as Borrower,
                                       AND
                      CERTAIN SUBSIDIARIES OF COVANCE INC.
                                 as Guarantors,
                                       AND
                         THE LENDERS IDENTIFIED HEREIN,
                                       AND
                               NATIONSBANK, N.A.,
                             as Administrative Agent
                                       AND
                         WACHOVIA BANK OF GEORGIA, N.A.,
                              as Syndication Agent
                          DATED AS OF NOVEMBER 26, 1996


                                        1

<PAGE>



                                TABLE OF CONTENTS



                                    SECTION 1

                        DEFINITIONS AND ACCOUNTING TERMS

<TABLE>

<S>        <C>                                                                    <C>

1.1        Definitions............................................................ 1
1.2        Computation of Time Periods and Other Definitional Provisions......... 23
1.3        Accounting Terms...................................................... 23

                                    SECTION 2

                                CREDIT FACILITIES

2.1        Revolving Loans....................................................... 23
2.2        Letter of Credit Subfacility.......................................... 26
2.3        Competitive Bid Loans Subfacility..................................... 31
2.4        Swing Line Loans Subfacility.......................................... 34
2.5        Currency Equivalents.................................................. 36

                                    SECTION 3

          GENERAL PROVISIONS APPLICABLE TO LOANS AND LETTERS OF CREDIT

3.1        Interest.............................................................. 36
3.2        Place and Manner of Payments.......................................... 36
3.3        Prepayments........................................................... 37
3.4        Fees.................................................................. 38
3.5        Payment in full at Maturity........................................... 39
3.6        Computations of Interest and Fees..................................... 39
3.7        Pro Rata Treatment.................................................... 40
3.8        Sharing of Payments................................................... 41
3.9        Capital Adequacy...................................................... 41
3.10       Inability To Determine Eurocurrency Rate or Make Loans in Foreign
           Currency.............................................................. 42
3.11       Illegality............................................................ 42
3.12       Requirements of Law................................................... 43
3.13       Taxes................................................................. 44
3.14       Compensation.......................................................... 47

                                    SECTION 4

                                    GUARANTY

4.1        Guaranty of Payment................................................... 48
4.2        Obligations Unconditional............................................. 48
4.3        Modifications......................................................... 49
4.4        Waiver of Rights...................................................... 49

                                        i

<PAGE>

4.5        Reinstatement......................................................... 49
4.6        Remedies.............................................................. 50
4.7        Limitation of Guaranty................................................ 50
4.8        Rights of Contribution................................................ 51

                                    SECTION 5

                              CONDITIONS PRECEDENT

5.1        Closing Conditions.................................................... 52
5.2        Conditions to All Extensions of Credit................................ 55

                                    SECTION 6

                         REPRESENTATIONS AND WARRANTIES

6.1        Financial Condition................................................... 56
6.2        No Material Change.................................................... 56
6.3        Organization and Good Standing........................................ 56
6.4        Due Authorization..................................................... 56
6.5        No Conflicts.......................................................... 56
6.6        Consents.............................................................. 57
6.7        Enforceable Obligations............................................... 57
6.8        No Default............................................................ 57
6.9        Liens................................................................. 57
6.10       Indebtedness.......................................................... 57
6.11       Litigation............................................................ 57
6.12       Taxes................................................................. 57
6.13       Compliance with Law................................................... 57
6.14       ERISA................................................................. 58
6.15       Subsidiaries.......................................................... 59
6.16       Use of Proceeds....................................................... 59
6.17       Government Regulation................................................. 59
6.18       Environmental Matters................................................. 60
6.19       Intellectual Property................................................. 61
6.20       Investments........................................................... 61
6.21       Disclosure............................................................ 61

                                    SECTION 7

                              AFFIRMATIVE COVENANTS

7.1        Information Covenants................................................. 60
7.2        Financial Covenants................................................... 63
7.3        Preservation of Existence and Franchises.............................. 64
7.4        Books and Records..................................................... 64
7.5        Compliance with Law................................................... 64
7.6        Payment of Taxes and Other Indebtedness............................... 64
7.7        Insurance............................................................. 64
7.8        Maintenance of Property............................................... 64
7.9        Performance of Obligations............................................ 65


                                       ii

<PAGE>

7.10       Use of Proceeds....................................................... 65
7.11       Audits/Inspections.................................................... 65
7.12       Additional Credit Parties............................................. 65
7.13       Spin-Off.............................................................. 66
7.14       Uncertificated Securities............................................. 66
7.15       Additional Guarantors or Additional Pledges of Stock.

                                    SECTION 8

                               NEGATIVE COVENANTS

8.1        Indebtedness.......................................................... 67
8.2        Liens................................................................. 68
8.3        Nature of Business.................................................... 68
8.4        Consolidation and Merger.............................................. 68
8.5        Sale or Lease of Assets............................................... 69
8.6        Sale Leasebacks....................................................... 69
8.7        Advances, Investments and Loans....................................... 69
8.8        Restricted Payments................................................... 69
8.9        Fiscal Year; Organizational Documents................................. 70

                                    SECTION 9

                                EVENTS OF DEFAULT

9.1        Events of Default..................................................... 70
9.2        Acceleration; Remedies................................................ 72
9.3        Allocation of Payments After Event of Default......................... 73

                                   SECTION 10

                                AGENCY PROVISIONS

10.1       Appointment........................................................... 74
10.2       Delegation of Duties.................................................. 75
10.3       Exculpatory Provisions................................................ 75
10.4       Reliance on Communications............................................ 75
10.5       Notice of Default..................................................... 76
10.6       Non-Reliance on Agents and Other Lenders.............................. 76
10.7       Indemnification....................................................... 77
10.8       Agents in Their Individual Capacity................................... 77
10.9       Successor Agent....................................................... 77

                                   SECTION 11

                                  MISCELLANEOUS

11.1       Notices............................................................... 78
11.2       Right of Set-Off...................................................... 78
11.3       Benefit of Agreement.................................................. 78
11.4       No Waiver; Remedies Cumulative........................................ 81


                                       iii

<PAGE>



11.5       Payment of Expenses; Indemnification.................................. 82
11.6       Amendments, Waivers and Consents...................................... 82
11.7       Counterparts.......................................................... 83
11.8       Headings.............................................................. 83
11.9       Defaulting Lender..................................................... 84
11.10      Survival.............................................................. 84
11.11      Governing Law......................................................... 84
11.12      Waiver of Jury Trial.................................................. 84
11.13      Time.................................................................. 84
11.14      Severability.......................................................... 84
11.15      Entirety.............................................................. 84
11.16      Binding Effect........................................................ 84
11.17      Confidentiality....................................................... 85

</TABLE>


                                       iv

<PAGE>


SCHEDULES


Schedule 1.1(a)   Revolving Commitment Percentages
Schedule 6.2               Material Adverse Effect
Schedule 6.10              Indebtedness
Schedule 6.11              Litigation
Schedule 6.14              ERISA
Schedule 6.15              Subsidiaries and Location of Facilities
Schedule 6.18              Environmental
Schedule 6.22              Location of Assets
Schedule 7.7               Insurance
Schedule 8.2               Liens
Schedule 8.7               Investments
Schedule 8.9               Organizational Documents
Schedule 11.1              Notices



EXHIBITS


Exhibit 2.1(b)             Form of Notice of Borrowing
Exhibit 2.1(e)             Form of Notice of Continuation/Conversion
Exhibit 2.1(g)             Form of Revolving Loan Note
Exhibit 2.3(b)             Form of Competitive Bid Loan Request
Exhibit 2.3(h)             Form of Competitive Bid Loan Note
Exhibit 2.4(b)             Form of Swing Line Loan Request
Exhibit 2.4(e)             Form of Swing Line Loan Note
Exhibit 7.1(c)             Form of Officer's Certificate
Exhibit 7.12               Form of Joinder Agreement
Exhibit 11.3               Form of Assignment Agreement



                                        v

<PAGE>


                                CREDIT AGREEMENT



         THIS CREDIT AGREEMENT (as amended, supplemented or otherwise modified
from time to time, this "Credit Agreement"), is entered into as of November 26,
1996 among COVANCE INC., a Delaware corporation ("Borrower"), certain of the
Borrower's Subsidiaries (individually a "Guarantor" and collectively the
"Guarantors"), the Lenders (as defined herein), NATIONSBANK, N.A., as
Administrative Agent for the Lenders and WACHOVIA BANK OF GEORGIA, N.A., as
Syndication Agent for the Lenders.

                                    RECITALS

         WHEREAS, Borrower wishes to enter into a $250 million revolving credit
facility; and

         WHEREAS, the Lenders party hereto have agreed to make the requested
revolving credit facility available to the Borrower on the terms and conditions
hereinafter set forth.

         NOW, THEREFORE, IN CONSIDERATION of the premises and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:


                                    SECTION 1

                        DEFINITIONS AND ACCOUNTING TERMS

         1.1 Definitions. As used herein, the following terms shall have the
meanings herein specified unless the context otherwise requires. Defined terms
herein shall include in the singular number the plural and in the plural the
singular:

                  "Additional Credit Party" means, at any time, each Person that
         shall have executed a Joinder Agreement after the Closing Date and
         shall not have been released from its obligations as a Guarantor, as
         provided in Sections 7.12 and 7.15.

                  "Adjusted Eurocurrency Rate" means the Eurocurrency Rate plus
         the Applicable Percentage.

                  "Adjusted Leverage Ratio" means the ratio of (a) an amount
         equal to Funded Debt minus the obligations of Corning Bio, Inc. under
         the Corning Bio TROL to (b) EBITDA.

                  "Administrative Agent" means NationsBank, N.A. (or any
         successor thereto) or any successor administrative agent appointed
         pursuant to Section 10.9.

                  "Agents" mean the Administrative Agent and the Syndication
         Agent and any successors and assigns in such capacity.



                                        1

<PAGE>



                  "Affiliate" means, with respect to any Person, any other
         Person directly or indirectly controlling (including but not limited to
         all directors and officers of such Person), controlled by or under
         direct or indirect common control with such Person. A Person shall be
         deemed to control a corporation if such Person possesses, directly or
         indirectly, the power (i) to vote 10% or more of the securities having
         ordinary voting power for the election of directors of such corporation
         or (ii) to direct or cause direction of the management and policies of
         such corporation, whether through the ownership of voting securities,
         by contract or otherwise.

                  "Agency Services Address" means NationsBank, N.A.,
         NC1-001-15-04, 101 North Tryon Street, Charlotte, North Carolina 28255,
         Attn: Agency Services, or such other address as may be identified by
         written notice from the Administrative Agent to the Borrower.

                  "Applicable Percentage" means, subject to the penultimate
         paragraph of this definition, the appropriate applicable percentages
         corresponding to the Adjusted Leverage Ratio in effect as of the most
         recent Calculation Date as shown below:


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------
                                         Long Term          Applicable         Applicable
                                         Unsecured        Percentage for       Percentage         Applicable
Pricing            Adjusted          Debt Rating of      Eurocurrency       for Letter of     Percentage for
 Level          Leverage Ratio          Borrower            Loans            Credit Fee       Facility Fees
<S>             <C>                  <C>                 <C>                 <C>              <C>  
   I            Less than or =         A- or better
                  1.0 to 1.0             from S&P            .17%               .17%               .08%
                                      A3 or better
                                       from Moody's

   II           Less than or =      BBB+ from S&P            .20%               .20%               .10%
              1.50 to 1.0 but      Baa1 from Moody's
               greater than
                 1.0 to 1.0         

  III         Less than or =        BBB from S&P             .25%               .25%              .125%
                2.0 to 1.0         Baa2 from Moody's
              but greater than
                1.50 to 1.0      

   IV         Less than or =       BBB- from S&P
              2.50 to 1.0 but      Baa3 from Moody's         .30%               .30%               .15%
               greater than
                2.0 to 1.0      


   V           Greater than        Lower than BBB-
                2.50 to 1.0           from S&P               .45%               .45%               .20%
                                   Lower than Baa3
                                     from Moody's
- ------------------------------------------------------------------------------------------------------------
</TABLE>

         Subject to the penultimate paragraph of this definition, the
Applicable Percentage for Eurocurrency Loans, the Letter of Credit Fee
and the Facility Fees shall, in each case, be determined and adjusted
quarterly on the date (each a "Calculation Date") five Business Days
after the date by which the Borrower is required to provide the
officer's certificate in accordance with the provisions of Section
7.1(c); provided that the initial Applicable Percentage for
Eurocurrency Loans, the Letter of Credit Fee and the Facility Fees
shall be based on Pricing Level III (as shown above) and shall remain
at Pricing Level III until the first Calculation Date subsequent to
March 31, 1997 and, thereafter, the Pricing Level shall be determined
by the then current Adjusted Leverage Ratio; and provided further that
if the Borrower fails to provide the officer's certificate required by
Section 7.1(c) on or before any Calculation Date subsequent to March
31, 1997, the Applicable Percentage for Revolving Loans, the Letter of
Credit Fee and the Facility Fees shall be based on Pricing Level V from


                                        2

<PAGE>



         such Calculation Date until such time that an appropriate officer's
         certificate is provided whereupon the Pricing Level shall be determined
         by the then current Adjusted Leverage Ratio. Each determination of the
         Applicable Percentage shall be effective from one Calculation Date
         until the next Calculation Date. Any adjustment in the Applicable
         Percentage shall be applicable to all existing Loans and Letters of
         Credit as well as any new Loans made or Letters of Credit issued.

                  At any time, the Borrower may, by written notice to the
         Administrative Agent, tie the definition of Applicable Percentage to
         the long term unsecured (non-credit enhanced) debt rating of the
         Borrower as determined by S&P and Moody's (if the Borrower has received
         a long term unsecured debt rating from both S&P and Moody's and
         irrespective of the then Adjusted Leverage Ratio); provided that such
         decision by the Borrower shall be permanent and irrevocable.
         Thereafter, the Applicable Percentage shall mean, at any time, the
         applicable percentage corresponding to the long term unsecured debt
         ratings of the Borrower, as shown above, as such ratings may change
         from time to time. If at any time the ratings provided by S&P and
         Moody's are split between two different pricing levels, the appropriate
         pricing level shall be based on the higher of the two ratings (i.e. the
         lowest pricing based on the ratings); provided that if the split
         between the two ratings is more than one pricing level then the
         appropriate pricing level shall be one level above the lowest rating
         (i.e. the pricing shall be based on the level that provides one level
         cheaper pricing than the highest pricing based on the ratings). If
         subsequent to the election by the Borrower to tie its pricing to its
         long term unsecured (non-credit enhanced) debt rating, the Borrower's
         long term unsecured debt is no longer rated by S&P and Moody's then
         Pricing Level V shall apply.

                  The Borrower shall promptly deliver to the Administrative
         Agent, at the address set forth on Schedule 11.1 and at the Agency
         Services Address, information regarding any change in its unsecured
         (non-credit enhanced) debt rating, as determined by S&P and Moody's
         that would change the existing Pricing Level pursuant to the preceding
         paragraph.

                  "Bankruptcy Code" means the Bankruptcy Code in Title 11 of the
         United States Code, as amended, modified, succeeded or replaced from
         time to time.

                  "Base Rate" means, for any day, the rate per annum (rounded
         upwards, if necessary, to the nearest whole multiple of 1/100 of 1%)
         equal to the greater of (a) the Federal Funds Rate in effect on such
         day plus 1/2 of 1% or (b) the Prime Rate in effect on such day. If for
         any reason the Administrative Agent shall have determined (which
         determination shall be conclusive absent manifest error) that it is
         unable after due inquiry to ascertain the Federal Funds Rate for any
         reason, including the inability or failure of the Administrative Agent
         to obtain sufficient quotations in accordance with the terms hereof,
         the Base Rate shall be determined without regard to clause (a) of the
         first sentence of this definition until the circumstances giving rise
         to such inability no longer exist. Any change in the Base Rate due to a
         change in the Prime Rate or the Federal Funds Rate shall be effective
         on the effective date of such change in the Prime Rate or the Federal
         Funds Rate, respectively.

                  "Base Rate Loan" means any Loan bearing interest at a rate
         determined by reference to the Base Rate.


                                        3

<PAGE>



                  "Benefits Plan" means each of (a) the Employee Stock Ownership
         Plan of the Borrower, (b) the Trust Deed of the Covance Inc. Employee
         Share Trust between the trustee and the Borrower, (c) the Stock
         Purchase Savings Plan of the Borrower restated as of December 31, 1996,
         (d) the Employee Stock Purchase Plan of the Borrower, (e) the Employee
         Equity Participation Program of the Borrower and (f) any other "pension
         plan" (as defined in Section 3(2) of ERISA) of the Borrower or trust
         created thereunder.

                  "Borrower" means Covance Inc., a Delaware corporation,
         together with any successors and permitted assigns.

                  "Borrower Obligations" means, without duplication, all of the
         obligations of the Borrower to the Lenders (including the Issuing
         Lender and NationsBank) and the Agents, whether for principal,
         interest, fees, LOC Obligations, indemnifications or otherwise whenever
         arising, under this Credit Agreement, the Notes, the Collateral
         Documents or any of the other Credit Documents to which the Borrower is
         a party, including, without limitation, any amounts that would have
         accrued but for the automatic stay under the Bankruptcy Code.

                  "Business Day" means any day other than a Saturday, a Sunday,
         a legal holiday or a day on which banking institutions are authorized
         or required by law or other governmental action to close in Charlotte,
         North Carolina or New York, New York; provided that in the case of
         Eurocurrency Loans, such day is also a day on which dealings between
         banks are carried on in U.S. dollar deposits in the London interbank
         market.

                  "Calculation Date" has the meaning set forth in the definition
         of Applicable Percentage.

                  "Capital Expenditures" means all expenditures of the Credit
         Parties and their Subsidiaries which, in accordance with GAAP, would be
         classified as capital expenditures, including, without limitation,
         Capital Leases.

                  "Capital Lease" means, as applied to any Person, any lease of
         any property (whether real, personal or mixed) by that Person as lessee
         which, in accordance with GAAP, is or should be accounted for as a
         capital lease on the balance sheet of that Person.

                  "Cash Equivalents" means (a) securities issued or directly and
         fully guaranteed or insured by the United States of America or any
         agency or instrumentality thereof (provided that the full faith and
         credit of the United States of America is pledged in support thereof)
         having maturities of not more than twelve months from the date of
         acquisition, (b) U.S. dollar denominated time and demand deposits and
         certificates of deposit of (i) any Lender, (ii) any domestic commercial
         bank having capital and surplus in excess of $500,000,000 or (iii) any
         bank whose short-term commercial paper rating from S&P is at least A-1
         or the equivalent thereof or from Moody's is at least P-1 or the
         equivalent thereof (any such bank being an "Approved Bank"), in each
         case with maturities of not more than 270 days from the date of
         acquisition, (c) commercial paper and variable or fixed rate notes
         issued by any Approved Bank (or by the parent company thereof) or any
         variable rate notes issued by, or


                                        4

<PAGE>



         guaranteed by, any domestic corporation rated A-1 (or the equivalent
         thereof) or better by S&P or P-1 (or the equivalent thereof) or better
         by Moody's and maturing within six months of the date of acquisition,
         (d) repurchase agreements with a bank or trust company (including any
         of the Lenders) or securities dealer having capital and surplus in
         excess of $500,000,000 for direct obligations issued by or fully
         guaranteed by the United States of America in which the Borrower shall
         have a perfected first priority security interest (subject to no other
         Liens) and having, on the date of purchase thereof, a fair market value
         of at least 100% of the amount of the repurchase obligations, (e)
         marketable direct obligations issued by any state of the United States
         of America or any political subdivision of any such state or any public
         instrumentality thereof maturing within one year from the date of
         acquisition thereof and, at the time of acquisition, rated A-1 (or the
         equivalent thereof) or better from S&P or rated P-1 (or the equivalent
         thereof) or better from Moody's, (f) Eurocurrency time deposits having
         a maturity of less than one year purchased from any Lender directly
         (whether or not such deposit is with such Lender or any other Lender
         hereunder) and (g) Investments, classified in accordance with GAAP as
         current assets, in money market investment programs registered under
         the Investment Company Act of 1940, as amended, which are administered
         by financial institutions having capital of at least $500,000,000 and
         the portfolios of which are limited to Investments of the character
         described in the foregoing subdivisions (a) through (g).

                  "Change of Control" means, at any time subsequent to the
         occurrence of the Spin-Off, the occurrence of the following event: any
         "person" or "group" (within the meaning of Section 13(d) or 14(d) of
         the Exchange Act) has become, directly or indirectly, the "beneficial
         owner" (as defined in Rules 13d-3 and 13d-5 under the Exchange Act,
         except that a Person shall be deemed to have "beneficial ownership" of
         all shares that any such Person has the right to acquire, whether such
         right is exercisable immediately or only after the passage of time), by
         way of merger, consolidation or otherwise, of 30% or more of the voting
         power of the Voting Stock of the Borrower on a fully-diluted basis,
         after giving effect to the conversion and exercise of all outstanding
         warrants, options and other securities of the Borrower (whether or not
         such securities are then currently convertible or exercisable);
         provided that none of the Benefit Plans shall be deemed to be a
         "beneficial owner" under this definition.

                  "Closing Date" means the date hereof.

                  "Code" means the Internal Revenue Code of 1986 and the rules
         and regulations promulgated thereunder, as amended, modified, succeeded
         or replaced from time to time.

                  "Collateral Assignment of Notes" means those certain
         Collateral Assignment of Notes, executed and delivered by the
         applicable Credit Parties in favor of the Administrative Agent, for the
         benefit of the Lenders, collaterally assigning promissory notes issued
         by any Non-Material Domestic Subsidiary to a Credit Party.

                  "Collateral Documents" means the Pledge Agreements and the
         Collateral Assignments of Notes.



                                        5

<PAGE>



                  "Commitments" means the commitment of each Lender with respect
         to the Revolving Committed Amount and the commitment of NationsBank
         with respect to the Swing Line Committed Amount.

                  "Competitive Bid" means an offer by a Lender to make a
         Competitive Bid Loan pursuant to the terms of Section 2.3.

                  "Competitive Bid Loan" means a loan made by a Lender in its
         discretion pursuant to the provisions of Section 2.3.

                  "Competitive Bid Loan Notes" means the promissory notes of the
         Borrower in favor of each of the Lenders evidencing the Competitive Bid
         Loans provided pursuant to Section 2.3, individually or collectively,
         as appropriate, as such promissory notes may be amended, modified,
         supplemented, extended, renewed or replaced from time to time and as
         evidenced in the form of Exhibit 2.3(h).

                  "Competitive Bid Loan Request" means a request by the Borrower
         for Competitive Bids substantially in the form of Exhibit 2.3(b).

                  "Competitive Bid Rate" means, as to any Competitive Bid made
         by a Lender in accordance with the provisions of Section 2.3, (a) in
         the case of a Eurocurrency Competitive Loan, the Eurocurrency Rate and
         (b) in the case of a Fixed Rate Competitive Loan the fixed rate of
         interest offered by the Lender making the Competitive Bid.

                  "Corning Bio TROL" means (a) that certain Lease Agreement (Tax
         Retention Operating Lease - Personal Property), dated as of June 30,
         1995 between NationsBanc Leasing Corporation of North Carolina and
         Corning Bio, Inc. (f/k/a Corning Biopro, Inc.), (b) that certain Lease
         Agreement (Tax Retention Operating Lease - Real Property) dated as of
         June 30, 1995 between NationsBanc Leasing Corporation and Corning Bio,
         Inc. (f/k/a Corning Biopro, Inc.) and all Operative Agreements (as
         defined in the above agreements) entered into in connection therewith,
         as such agreements may be amended, modified or supplemented from time
         to time and (c) without duplication, all agreements, instruments and
         documents pursuant to which any one or more of the Borrower and its
         Subsidiaries guaranty or otherwise support any obligations under any
         Corning Bio TROL described in (a) or (b) above.

                  "Credit Documents" means this Credit Agreement, the Notes, any
         Joinder Agreement, the Fee Letter, the Collateral Documents and all
         other related agreements and documents issued or delivered hereunder by
         (i) a Guarantor to guarantee the Borrower Obligations or to secure such
         guarantee or (ii) the Borrower or one of its Subsidiaries (other than a
         Guarantor) to secure the Borrower Obligations.

                  "Credit Parties" means the Borrower and the Guarantors and
         "Credit Party" means any one of them.



                                        6

<PAGE>



                  "Credit Party Obligations" means, without duplication, all of
         the obligations of the Credit Parties to the Lenders (including the
         Issuing Lender and NationsBank) and the Agents, whether for principal,
         interest, fees, LOC Obligations, indemnifications or otherwise whenever
         arising, under this Credit Agreement, the Notes, the Collateral
         Documents or any of the other Credit Documents to which the Borrower or
         any other Credit Party is a party, including, without limitation, any
         amounts that would have accrued but for the automatic stay under the
         Bankruptcy Code.

                  "Default" means any event, act or condition which with notice
         or lapse of time, or both, would constitute an Event of Default.

                  "Defaulting Lender" means, at any time, any Lender that: (a)
         has failed to make a Loan or purchase a Participation Interest required
         pursuant to the terms of this Credit Agreement (but only for so long as
         such Loan is not made or such Participation Interest is not purchased),
         (b) has failed to pay to the Agents or any Lender an amount owed by
         such Lender pursuant to the terms of this Credit Agreement (but only
         for so long as such amount has not been repaid) or (c) has been deemed
         insolvent or has become subject to a bankruptcy or insolvency
         proceeding or to a receiver, trustee or similar official.

                  "Disclosure Documents" means, collectively, as of any date,
         the Information Statement, the Offering Memorandum, the Credit
         Documents, the SEC Documents and other certificates or instruments
         provided to the Agents and the Lenders in connection with this Credit
         Agreement.

                  "Dollars" and "$" means dollars in lawful currency of the
         United States of America.

                  "Domestic Subsidiary" means each direct and indirect
         Subsidiary of the Borrower that (a) is domiciled, incorporated or
         organized under the laws of any State of the United States or the
         District of Columbia and (b) has at least 20% of its sales, earnings or
         assets (determined on a consolidated basis) located or derived from its
         operations in the United States of America.

                  "EBIT" means, for any period, with respect to the Borrower and
         its Subsidiaries on a consolidated basis, the sum of (a) Net Income for
         such period (excluding the effect of any extraordinary or other
         non-recurring gains or losses outside of the ordinary course of
         business), provided that for any fiscal quarter ending prior to
         December 31, 1997, Net Income shall not include the one time
         restructuring charge incurred in connection with the Spin-Off as long
         as such restructuring charge does not exceed $75,000,000 plus (b) an
         amount which, in the determination of Net Income for such period, has
         been deducted for (i) Interest Expense for such period and (ii) total
         Federal, state, foreign or other income taxes for such period, all as
         determined in accordance with GAAP.

                  "EBITDA" means, for any period, with respect to the Borrower
         and its Subsidiaries on a consolidated basis, an amount equal to (a)
         EBIT plus (b) an amount which, in the determination of Net Income for
         such period, has been deducted for all depreciation and amortization
         for such period, all as determined in accordance with GAAP.


                                        7

<PAGE>




                  "Effective Date" means the date, as specified by the
         Administrative Agent in writing, on which the conditions set forth in
         Section 5.1 shall have been fulfilled (or waived in the sole discretion
         of the Lenders).

                  "Eligible Assignee" means (a) a Lender; (b) an Affiliate or
         Subsidiary of a Lender; (c) a commercial bank organized under the laws
         of the United States, or any State thereof, and having a combined
         capital and surplus of at least $500,000,000; (d) a savings and loan
         association or savings bank organized under the laws of the United
         States, or any State thereof, and having a combined capital and surplus
         of at least $500,000,000; (e) a commercial bank organized under the
         laws of any other country that is a member of the OECD or has concluded
         special lending arrangements with the International Monetary Fund
         associated with its general arrangements to borrow or a political
         subdivision of any such country, and having a combined capital and
         surplus of at least $500,000,000, so long as such bank is acting
         through a branch or agency located in the United States; (f) a finance
         company, insurance company or other financial institution or fund
         (whether a corporation, partnership, trust or other entity) that is
         engaged in making, purchasing or otherwise investing in commercial
         loans in the ordinary course of its business and having a combined
         capital and surplus of at least $250,000,000; and (g) any other Person
         approved by the Agents and the Borrower.

                  "Environmental Claim" means any investigation, written notice,
         violation, written demand, written allegation, action, suit,
         injunction, judgment, order, consent decree, penalty, fine, lien,
         proceeding, or written claim whether administrative, judicial, or
         private in nature arising (a) pursuant to, or in connection with, an
         actual or alleged violation of, any Environmental Law, (b) in
         connection with any Hazardous Material, (c) from any assessment,
         abatement, removal, remedial, corrective, or other response action in
         connection with an Environmental Law or other order of a Governmental
         Authority or (d) from any actual or alleged damage, injury, threat, or
         harm to health, safety, natural resources, or the environment.

                  "Environmental Laws" means any current or future legal
         requirement of any Governmental Authority pertaining to (a) the
         protection of health, safety, and the indoor or outdoor environment,
         (b) the conservation, management, or use of natural resources and
         wildlife, (c) the protection or use of surface water and groundwater or
         (d) the management, manufacture, possession, presence, use, generation,
         transportation, treatment, storage, disposal, release, threatened
         release, abatement, removal, remediation or handling of, or exposure
         to, any hazardous or toxic substance or material or (e) pollution
         (including any release to land surface water and groundwater) and
         includes, without limitation, the Comprehensive Environmental Response,
         Compensation, and Liability Act of 1980, as amended by the Superfund
         Amendments and Reauthorization Act of 1986, 42 USC 9601 et seq., Solid
         Waste Disposal Act, as amended by the Resource Conservation and
         Recovery Act of 1976 and Hazardous and Solid Waste Amendment of 1984,
         42 USC 6901 et seq., Federal Water Pollution Control Act, as amended by
         the Clean Water Act of 1977, 33 USC 1251 et seq., Clean Air Act of
         1966, as amended, 42 USC 7401 et seq., Toxic Substances Control Act of
         1976, 15 USC 2601 et seq., Hazardous Materials Transportation Act, 49
         USC App.


                                        8

<PAGE>



         1801 et seq., Occupational Safety and Health Act of 1970, as amended,
         29 USC 651 et seq., Oil Pollution Act of 1990, 33 USC 2701 et seq.,
         Emergency Planning and Community Right- to-Know Act of 1986, 42 USC
         11001 et seq., National Environmental Policy Act of 1969, 42 USC 4321
         et seq., Safe Drinking Water Act of 1974, as amended, 42 USC 300(f) et
         seq., any analogous implementing or successor law, and any amendment,
         rule, regulation, order, or directive issued thereunder.

                  "ERISA" means the Employee Retirement Income Security Act of
         1974, as amended, and any successor statute thereto, as interpreted by
         the rules and regulations thereunder, all as the same may be in effect
         from time to time. References to sections of ERISA shall be construed
         also to refer to any successor sections.

                  "ERISA Affiliate" means (except as otherwise set forth herein)
         any Credit Party, or any of its Subsidiaries, which, together with any
         Credit Party, is treated as a single employer under Sections 414(b),
         (c), (m), or (o) of the Code.

                  "Eurocurrency Competitive Loan" means a Competitive Bid Loan
         bearing interest at a rate determined by reference to the Eurocurrency
         Rate.

                  "Eurocurrency Loan" means a Loan, other than a Eurocurrency
         Competitive Loan, bearing interest based at a rate determined by
         reference to the Eurocurrency Rate.

                   "Eurocurrency Rate" means, for the Interest Period for each
         Eurocurrency Loan comprising part of the same borrowing (including
         conversions, extensions and renewals), a per annum interest rate
         determined pursuant to the following formula:

                  Eurocurrency Rate =            London Interbank Offered Rate
                                            1 - Eurocurrency Reserve Percentage

                  "Eurocurrency Reserve Percentage" means for any day, that
         percentage (expressed as a decimal) which is in effect from time to
         time under Regulation D of the Board of Governors of the Federal
         Reserve System (or any successor), as such regulation may be amended
         from time to time or any successor regulation, as the maximum reserve
         requirement (including, without limitation, any basic, supplemental,
         emergency, special, or marginal reserves, if any) applicable with
         respect to Eurocurrency liabilities as that term is defined in
         Regulation D (or against any other category of liabilities that
         includes deposits by reference to which the interest rate of
         Eurocurrency Loans is determined), whether or not Lender has any
         Eurocurrency liabilities subject to such reserve requirement at that
         time. The Eurocurrency Rate shall be adjusted automatically on and as
         of the effective date of any change in the Eurocurrency Reserve
         Percentage.

                  "Event of Default" means any of the events or circumstances
         described in Section 9.1.



                                        9

<PAGE>



                  "Exchange Act" means the Securities Exchange Act of 1934, as
         amended, and the rules and regulations promulgated thereunder, as
         amended, modified, succeeded or replaced from time to time.

                  "Extension of Credit" means, as to any Lender, the making of a
         Loan by such Lender (or a participation therein by a Lender) or the
         issuance of, or participation in, a Letter of Credit by such Lender.

                  "Facility Fees" has the meaning set forth in Section 3.4.

                  "Federal Funds Rate" means for any day the rate per annum
         equal to the weighted average of the rates on overnight Federal funds
         transactions with members of the Federal Reserve System arranged by
         Federal funds brokers on such day, as published by the Federal Reserve
         Bank of New York on the Business Day next succeeding such day; provided
         that (a) if such day is not a Business Day, the Federal Funds Rate for
         such day shall be such rate on such transactions on the next preceding
         Business Day and (b) if no such rate is so published on such next
         preceding Business Day, the Federal Funds Rate for such day shall be
         the average rate quoted to the Administrative Agent on such day on such
         transactions as determined by the Administrative Agent.

                  "Fee Letter" means that certain letter agreement, dated as of
         September 30, 1996, between the Agents and the Borrower, as amended,
         modified, supplemented or replaced from time to time.

                  "First Tier Foreign Subsidiary" means, at any date of
         determination, each Foreign Subsidiary in which any one or more of the
         Borrower and its Domestic Subsidiaries owns more than 50%, in the
         aggregate, of the Voting Stock of such Foreign Subsidiary.

                  "Fixed Charge Coverage Ratio" means the ratio of (a) an amount
         equal to the sum of EBIT plus Rent Expense to (b) an amount equal to
         the sum of Interest Expense plus Rent Expense.

                  "Fixed Rate" has the meaning set forth in Section 2.3(c).

                  "Fixed Rate Competitive Loan" means a Competitive Bid Loan
         designated as a Fixed Rate Competitive Loan in accordance with Section
         2.3.

                  "Foreign Currency" means British Pounds Sterling, Swiss
         Francs, German Marks and Japanese Yen or such other currency as agreed
         to between the Borrower and all the Lenders. Each Foreign Currency must
         be one (a) that is freely transferable and convertible into Dollars and
         (b) in which deposits are generally available to the Lenders in the
         London interbank market.

                  "Foreign Subsidiaries" means all Subsidiaries of the Borrower
         that are not Domestic Subsidiaries.



                                       10

<PAGE>



                  "Funded Debt" means, without duplication, the sum of (a) all
         Indebtedness of the Credit Parties and their Subsidiaries for borrowed
         money, (b) all purchase money Indebtedness of the Credit Parties and
         their Subsidiaries, (c) the principal portion of all obligations of the
         Credit Parties and their Subsidiaries under Capital Leases, (d) all
         obligations, contingent or otherwise, relative to the face amount of
         all letters of credit (other than letters of credit supporting trade
         payables in the ordinary course of business), whether or not drawn, and
         banker's acceptances issued for the account of such Person (it being
         understood that, to the extent an undrawn letter of credit supports
         another obligation consisting of Indebtedness, in calculating
         aggregated Indebtedness only such other obligation shall be included),
         (e) all Guaranty Obligations of the Credit Parties and their
         Subsidiaries with respect to Funded Debt of another Person, (f) all
         Funded Debt of another entity secured by a Lien on any property of the
         Credit Parties and their Subsidiaries whether or not such Funded Debt
         has been assumed by a Credit Party or any of its Subsidiaries, (g) all
         Funded Debt of any partnership or unincorporated joint venture to the
         extent a Credit Party or one of its Subsidiaries is legally obligated,
         net of any assets of such partnership or joint venture and (h) the
         principal balance outstanding under any synthetic lease, tax retention
         operating lease, off-balance sheet loan or similar off-balance sheet
         financing product where such transaction is considered borrowed money
         indebtedness for tax purposes but is classified as an operating lease
         in accordance with GAAP.

                  "GAAP" means generally accepted accounting principles in the
         United States applied on a consistent basis and subject to Section 1.3.

                  "Governmental Authority" means any Federal, state, local,
         provincial or foreign court or governmental agency, authority,
         instrumentality or regulatory body.

                  "Guarantor" means at any time, (a) each of the parties to this
         Credit Agreement listed as "Guarantors" on the signature pages hereof
         which are the only Material Domestic Subsidiaries as of the Closing
         Date and (b) each other Person that is an Additional Credit Party, in
         each case, together with their successors and assigns, but excluding
         any such Person that shall have been released from its guaranty
         obligations pursuant to Section 7.12 or 7.15.

                  "Guaranty Obligations" means, with respect to any Person,
         without duplication, any obligations (other than endorsements in the
         ordinary course of business of negotiable instru ments for deposit or
         collection) guaranteeing any Indebtedness of any other Person in any
         manner, whether direct or indirect, and including without limitation
         any obligation, whether or not contingent, (a) to purchase any such
         Indebtedness or other obligation or any property constituting security
         therefor, (b) to advance or provide funds or other support for the
         payment or purchase of such Indebtedness or to maintain working capital
         or solvency of such other Person (including, without limitation,
         maintenance agreements, comfort letters, take or pay arrangements, put
         agreements or similar agreements or arrangements but excluding any
         comfort letters, letters of awareness or similar agreements or
         arrangements to the extent such Person is not legally obligated
         thereunder) for the benefit of the holder of Indebtedness of such other
         Person, (c) to lease or purchase property, securities or services
         primarily for the purpose of assuring the owner of such Indebtedness or
         (d) to otherwise assure or hold harmless the owner of such Indebtedness
         or obligation against loss in respect thereof. The


                                       11

<PAGE>



         amount of any Guaranty Obligation hereunder shall (subject to any
         limitations set forth therein) be deemed to be an amount equal to the
         outstanding principal amount (or maximum principal amount, if larger)
         of the Indebtedness in respect of which such Guaranty Obligation is
         made.

                  "Hazardous Materials" means any substance, material or waste
         defined or regulated in or under any applicable Environmental Laws.

                  "Indebtedness" of any Person means, without duplication, (a)
         all obligations of such Person for borrowed money, (b) all obligations
         of such Person evidenced by bonds, debentures, notes or similar
         instruments, or upon which interest payments are customarily made, (c)
         all obligations of such Person under conditional sale or other title
         retention agreements relating to property purchased by such Person to
         the extent of the value of such property (other than customary
         reservations or retentions of title under agreements with suppliers
         entered into in the ordinary course of business), (d) all obligations,
         other than intercompany items, of such Person issued or assumed as the
         deferred purchase price of property or services purchased by such
         Person which would appear as liabilities on a balance sheet of such
         Person, (e) all Indebtedness of others secured by any Lien on property
         or assets owned by such Person, (f) all Guaranty Obligations of such
         Person, (g) the principal portion of all obligations of such Person
         under (i) Capital Leases and (ii) any synthetic lease, tax retention
         operating lease, off-balance sheet loan or similar off-balance sheet
         financing product of such Person where such transaction is considered
         borrowed money indebtedness for tax purposes but is classified as an
         operating lease in accordance with GAAP, (h) the maximum amount of all
         performance and standby letters of credit issued or bankers'
         acceptances facilities created for the account of such Person and,
         without duplication, all drafts drawn thereunder (to the extent
         unreimbursed), (i) the payment obligations required by such Person to
         be made, prior to the Revolving Loan Maturity Date, for mandatory
         redemption or mandatory sinking fund payments under any preferred stock
         issued by such Person and (j) the aggregate amount of uncollected
         accounts receivable of such Person subject at such time to a sale of
         receivables (or similar transaction) regardless of whether such
         transaction is effected without recourse to such Person or in a manner
         that would not be reflected on the balance sheet of such Person in
         accordance with GAAP. The Indebtedness of any Person shall include the
         Indebtedness of any partnership or unincorporated joint venture in
         which such Person is legally obligated or has a reasonable expectation
         of being liable with respect thereto.

                  "Information Statement" means the information memorandum dated
         September 20, 1996 delivered in connection with the distribution of the
         common stock of Corning Clinical Laboratories Inc. and Corning
         Pharmaceutical Services Inc., as such memorandum may be amended,
         supplemented or otherwise modified from time to time on or before the
         Effective Date.

                  "Interest Expense" means, for any period, with respect to the
         Credit Parties and their Subsidiaries on a consolidated basis, all
         interest expense (net of interest income), including the interest
         component under Capital Leases, as determined in accordance with GAAP.



                                       12

<PAGE>



                  "Interest Payment Date" means (a) as to Base Rate Loans, the
         first Business Day of each fiscal quarter of the Borrower, the date on
         which a Base Rate Loan is converted to a Eurocurrency Loan and the
         Revolving Loan Maturity Date, (b) as to Eurocurrency Loans, the last
         day of each applicable Interest Period, the Revolving Loan Maturity
         Date and, where the applicable Interest Period for a Eurocurrency Loan
         is greater than three months, the date three months from the beginning
         of the Interest Period and each three months thereafter and (c) as to
         Competitive Bid Loans and Quoted Rate Swing Line Loans, the last day of
         the Interest Period applicable to such Loan and the Revolving Loan
         Maturity Date; provided that if the Interest Period for a Competitive
         Bid Loan or a Quoted Rate Swing Line Loan is greater than 90 days then
         also on the first Business Day of each fiscal quarter of the Borrower.

                  "Interest Period" means, (a) as to Eurocurrency Loans, a
         period of one, two, three or six months' duration, as the Borrower may
         elect, commencing, in each case, on the date of the borrowing
         (including continuations and conversions thereof) and (b) with respect
         to Competitive Bid Loans and Quoted Rate Swing Line Loans, a period
         beginning on the date of such Loan and ending on the date specified in
         the applicable Competitive Bid Loan Request or Swing Line Loan Request;
         provided, however, (i) if any Interest Period would end on a day which
         is not a Business Day, such Interest Period shall be extended to the
         next succeeding Business Day (except, with respect to Eurocurrency
         Loans, that where the next succeeding Business Day falls in the next
         succeeding calendar month, then on the next preceding Business Day),
         (ii) no Interest Period shall extend beyond the Revolving Loan Maturity
         Date, (ii) with respect to Eurocurrency Loans, where an Interest Period
         begins on a day for which there is no numerically corresponding day in
         the calendar month in which the Interest Period is to end, such
         Interest Period shall end on the last Business Day of such calendar
         month and (iv) no Interest Period for a Competitive Bid Loan shall
         exceed 180 days.

                  "Investment" in any Person means (a) the acquisition (whether
         for cash, property, services, assumption of Indebtedness, securities or
         otherwise) of assets, shares of capital stock, bonds, notes,
         debentures, partnership, joint ventures or other ownership interests or
         other securities of such other Person or (b) any deposit with, or
         advance, loan or other extension of credit to, such Person (other than
         deposits made in connection with the purchase of equipment or other
         assets in the ordinary course of business) or (c) any other capital
         contribution to or investment in such Person, including, without
         limitation, any Guaranty Obligation (including any support for a Letter
         of Credit issued on behalf of such Person) incurred for the benefit of
         such Person.

                  "Issuing Lender" means NationsBank, N.A. or any successor
         thereto.

                  "Issuing Lender Fees" has the meaning set forth in Section
         3.4(b).

                  "Joinder Agreement" means a Joinder Agreement substantially in
         the form of Exhibit 7.12, as such Joinder Agreement may be amended,
         modified or supplemented from time to time.



                                       13

<PAGE>



                  "Lender" means any of the Persons identified as a "Lender" on
         the signature pages hereto, and any Person which may become a Lender by
         way of assignment in accordance with the terms hereof, together with
         their successors and permitted assigns.

                  "Letter of Credit" means a Letter of Credit issued for the
         account of a Credit Party by the Issuing Lender pursuant to Section
         2.2, as such Letter of Credit may be amended, modified, extended,
         renewed or replaced.

                  "Letter of Credit Fee" shall have the meaning assigned to such
         term in Section 3.4(b).

                  "Leverage Ratio" means the ratio of (a) Funded Debt to (b)
         EBITDA.

                  "Lien" means any mortgage, pledge, hypothecation, security
         interest, encumbrance or lien (statutory or otherwise) including,
         without limitation, the rights of a vendor or lessor under any
         conditional sale or title retention agreement or any lease
         substantially equivalent thereto.

                  "Loan" or "Loans" means the Revolving Loans, the Swing Line
         Loans and the Competitive Bid Loans, individually or collectively, as
         appropriate.

                  "LOC Committed Amount" means Twenty Five Million Dollars
         ($25,000,000).

                  "LOC Documents" means, with respect to any Letter of Credit,
         such Letter of Credit, any amendments thereto, any documents delivered
         in connection therewith, any application therefor, and any agreements,
         instruments, guarantees or other documents (whether general in
         application or applicable only to such Letter of Credit) governing or
         providing for (a) the rights and obligations of the parties concerned
         or at risk or (b) any collateral security for such obligations.

                  "LOC Obligations" means, at any time, the sum of (a) the
         maximum amount which is, or at any time thereafter may become,
         available to be drawn under Letters of Credit then outstanding,
         assuming compliance with all requirements for drawings referred to in
         such Letters of Credit plus (b) the aggregate amount of all drawings
         under Letters of Credit honored by an Issuing Lender but not
         theretofore reimbursed.

                  "LOC Participants" means the Lenders.

                  "London Interbank Offered Rate" means, with respect to any
         Eurocurrency Loan for the Interest Period applicable thereto, the rate
         of interest per annum (rounded upwards, if necessary, to the nearest
         1/100 of 1%) appearing on Telerate Page 3750 (or any successor page) as
         the London interbank offered rate for deposits in Dollars (or the
         applicable Foreign Currency) at approximately 11:00 A.M. (London time)
         two Business Days prior to the first day of such Interest Period for a
         term comparable to such Interest Period; provided, however, if more
         than one rate is specified on Telerate Page 3750, the applicable rate
         shall be the arithmetic mean of all such rates. If, for any reason,
         such rate is not available, the term "London Interbank Offered Rate"
         shall mean, with respect to any Eurocurrency Loan for the


                                       14

<PAGE>



         Interest Period applicable thereto, the rate of interest per annum
         (rounded upwards, if necessary, to the nearest 1/100 of 1%) appearing
         on Reuters Screen LIBO Page as the London interbank offered rate for
         deposits in Dollars at approximately 11:00 A.M. (London time) two
         Business Days prior to the first day of such Interest Period for a term
         comparable to such Interest Period; provided, however, if more than one
         rate is specified on Reuters Screen LIBO Page, the applicable rate
         shall be the arithmetic mean of all such rates.

                  "Mandatory Borrowing" has the meaning set forth in Section
         2.2(e).

                  "Material Adverse Effect" means a material adverse effect
         (after giving effect to any insurance proceeds or indemnification
         payments under existing insurance policies or agreements as long as the
         obligor under such policies or agreements is financially solvent and
         has acknowledged coverage) on (a) the results of operations or
         financial condition of the Borrower and its Subsidiaries taken as a
         whole, (b) the ability of a Credit Party to perform its respective
         obligations under this Credit Agreement or any of the other Credit
         Documents, or (c) the validity or enforceability of this Credit
         Agreement, any of the other Credit Documents, or the rights and
         remedies of the Lenders hereunder or thereunder taken as a whole;
         provided, however, that none of the following shall constitute a
         Material Adverse Effect: (i) the execution, delivery and performance of
         the Credit Documents, (ii) the Spin- Off and consummation of any one or
         more of the contemplated transactions related to the Spin-Off, as
         disclosed in the Information Statement, and (iii) the execution and
         delivery, in and of themselves, of the Transaction Agreement, the Tax
         Indemnity Agreements or the Tax Sharing Agreement.

                  "Material Domestic Subsidiary" means any Domestic Subsidiary
         of the Borrower that is also a Material Subsidiary.

                  "Material First Tier Foreign Subsidiary" mean a First Tier
         Foreign Subsidiary that is also a Material Subsidiary.

                  "Material Subsidiary" means, as of any date of determination,
         any Domestic Subsidiary or any Foreign Subsidiary that, together with
         its Subsidiaries on a consolidated basis, owns assets (excluding assets
         that pursuant to GAAP principles of consolidation would be eliminated
         from the consolidated balance sheet of the Borrower as of such date)
         equal to at least five percent (5%) of the total assets of the Borrower
         and its Subsidiaries on a consolidated basis; provided that neither
         Covance Health Economics Outcome Services Inc. (f/k/a Corning HTA,
         Inc.) nor any of its Subsidiaries shall not be deemed to be a Material
         Subsidiary.

                  "Moody's" means Moody's Investors Service, Inc., or any
         successor or assignee of the business of such company in the business
         of rating securities.

                  "Multiemployer Plan" means a Plan covered by Title IV of ERISA
         which is a multiemployer plan as defined in Section 3(37) or 4001(a)(3)
         of ERISA.



                                       15

<PAGE>



                  "Multiple Employer Plan" means a Plan covered by Title IV of
         ERISA, other than a Multiemployer Plan, which any Credit Party or any
         of its Subsidiaries or any ERISA Affiliate and at least one employer
         other than a Credit Party or any of its Subsidiaries or any ERISA
         Affiliate are contributing sponsors.

                  "NationsBank" means NationsBank, N.A. (or any successor
         thereto).

                  "Net Income" means, for any period, the net income after taxes
         for such period of the Credit Parties and their Subsidiaries on a
         consolidated basis, as determined in accordance with GAAP.

                  "Non-Excluded Taxes" has the meaning set forth in Section
         3.13.

                  "Non-Material Domestic Subsidiaries" means all Domestic
         Subsidiaries that are not Material Domestic Subsidiaries.

                  "Note" or "Notes" means the Revolving Loan Notes, the
         Competitive Bid Loan Notes and the Swing Line Loan Notes, individually
         or collectively, as appropriate.

                  "Notice of Borrowing" means a request by the Borrower for a
         Revolving Loan, substantially in the form of Exhibit 2.1(b).

                  "Notice of Continuation/Conversion" means a request by the
         Borrower to continue an existing Eurocurrency Loan to a new Interest
         Period or to convert a Eurocurrency Loan to a Base Rate Loan or a Base
         Rate Loan to a Eurocurrency Loan, substantially in the form of Exhibit
         2.1(e).

                  "Offering Memorandum" means the offering memorandum dated
         October, 1996 delivered by the Administrative Agents to the Lenders, as
         amended, supplemented or otherwise modified by the Information
         Statement, and as it may be further amended, supplemented or otherwise
         modified from time to time on or prior to the Effective Date.

                  "Operating Lease" means, as to any Person, any lease of any
         property (whether real, personal or mixed) by that Person as lessee
         which, in accordance with GAAP, is or should be accounted for as an
         operating lease.

                  "Participation Interest" means the Extension of Credit by a
         Lender by way of a purchase of a participation in Letters of Credit or
         LOC Obligations as provided in Section 2.2 or in any Loans as provided
         in Section 3.8.

                  "PBGC" means the Pension Benefit Guaranty Corporation
         established pursuant to Subtitle A of Title IV of ERISA and any
         successor thereto.

                  "Permitted Acquisition" means the acquisition of (a) all of
         the capital stock of another Person or (b) all or substantially all of
         the assets of another Person; provided that (i) to the extent any such
         acquisition is paid for in cash or through deferred payments or through
         the


                                       16

<PAGE>



         assumption of debt, any such acquisition shall not exceed $100,000,000
         and (ii) after giving effect to any such acquisition (A) the Credit
         Parties and their Subsidiaries are in compliance with all the financial
         covenants set forth in Section 7.2 and the use of proceeds covenant in
         Section 7.10 and (B) no Default or Event of Default exists and is
         continuing.

                  "Permitted Investments" means Investments which are (a) cash
         or Cash Equivalents, (b) accounts receivable created, acquired or made
         in the ordinary course of business and payable or dischargeable in
         accordance with customary trade terms, (c) inventory, raw materials and
         general intangibles (to the extent such general intangible is not a
         Capital Expenditure) acquired in the ordinary course of business, (d)
         Investments in the Borrower or a Subsidiary of the Borrower, (e) loans
         to directors, officers or employees in the ordinary course of business
         for reasonable business expenses, not to exceed in the aggregate
         $5,000,000 at any one time, (f) the investments existing on the date
         hereof, as set forth on Schedule 8.7, (g) Investments in Capital
         Expenditures, (h) Investments in Permitted Acquisitions, (i)
         Investments in joint ventures (other than joint ventures which are
         Subsidiaries of the Borrower), in the aggregate, not to exceed
         $10,000,000 at any one time, (j) as long as no Default or Event of
         Default exists and is continuing. Investments, if any, pursuant to (A)
         the Benefits Plans of the type referred to in subsection (a) and (b) of
         the definition of "Benefit Plans", (B) the Benefits Plans of the type
         referred to in subsections (c), (d), (e) and (f) of the definition of
         "Benefits Plans" in an aggregate amount not to exceed $50,000,000
         during the term of this Credit Agreement and (C) the Rights Plan in an
         aggregate amount not to exceed $2,000,000, and (k) received as
         consideration in connection with an asset sale permitted pursuant to
         Section 8.5.

                  "Permitted Liens" means (a) Liens securing Credit Party
         Obligations, if any (b) Liens for taxes not yet due or Liens for taxes
         being contested in good faith by appropriate proceedings for which
         adequate reserves determined in accordance with GAAP have been
         established (and as to which the property subject to any such Lien is
         not yet subject to foreclosure, sale or loss on account thereof), (c)
         Liens in respect of property imposed by law arising in the ordinary
         course of business such as materialmen's, mechanics', warehousemen's,
         carrier's, landlords' and other nonconsensual statutory Liens which are
         not past due more than 30 days or which are being contested in good
         faith by appropriate proceedings for which adequate reserves determined
         in accordance with GAAP have been established (and as to which the
         property subject to any such Lien is not yet subject to foreclosure,
         sale or loss on account thereof), (d) pledges or deposits made in the
         ordinary course of business to secure payment of worker's compensation
         insurance, unemployment insurance, pensions or social security
         programs, (e) Liens arising from good faith deposits in connection with
         or to secure performance of tenders, bids, leases, government
         contracts, performance and return-of-money bonds and other similar
         obligations incurred in the ordinary course of business (other than
         obligations in respect of the payment of borrowed money), (f) Liens
         arising from good faith deposits in connection with or to secure
         performance of statutory obligations and surety and appeal bonds, (g)
         easements, rights-of-way, restrictions (including zoning restrictions),
         matters of plat, minor defects or irregularities in title and other
         similar charges or encumbrances not, in any material respect, impairing
         the use of the encumbered property for its intended purposes, (h)
         judgment Liens that would not otherwise constitute an Event of Default
         and any other judgment Lien unless


                                       17

<PAGE>



         not discharged within sixty days of entry, pending appeal, or within
         sixty days after expiration of stay, (i) Liens in connection with
         Indebtedness allowed under Section 8.1(d), (j) Liens arising by virtue
         of any statutory or common law provision relating to banker's liens,
         rights of setoff or similar rights as to deposit accounts or other
         funds maintained with a creditor depository institution, (k) liens on
         leased equipment or under conditional sale or other title retention
         agreements, (l) leases or subleases granted to others not interfering
         in any material respect with the business of the Borrower or any of its
         Subsidiaries, (m) liens in favor of customs and revenue authorities as
         a matter of law to secure payment of customs duties, (n) liens securing
         surety bonds in an aggregate amount not to exceed $5,000,000, (o) liens
         securing appeal bonds covering assets less than or equal to
         $20,000,000, (p) Liens existing on the date hereof and identified on
         Schedule 8.2; provided that no such Lien shall extend to any property
         other than the property subject thereto on the Closing Date, (q) Liens
         securing any Corning Bio TROL and (r) Liens on the Voting Stock and
         other capital stock of any First Tier Foreign Subsidiary to the extent
         not pledged to the Administrative Agent pursuant to Section 7.12 and
         7.15.

                  "Person" means any individual, partnership, joint venture,
         firm, corporation, limited liability company, association, trust or
         other enterprise (whether or not incorporated), or any Governmental
         Authority.

                  "Plan" means any employee benefit plan (as defined in Section
         3(3) of ERISA) which is covered by ERISA and with respect to which any
         Credit Party or any of its Subsidiaries or any ERISA Affiliate is (or,
         if such plan were terminated at such time, would under Section 4069 of
         ERISA be deemed to be) an "employer" within the meaning of Section 3(5)
         of ERISA.

                  "Pledge Agreements" means those certain Pledge Agreements
         executed and delivered by the applicable Credit Parties in favor of the
         Administrative Agent, for the benefit of the Lenders, pledging 65% of
         the capital stock of the Material First Tier Foreign Subsidiaries and
         such other First Tier Foreign Subsidiaries as required by Section 7.15,
         as they may be amended, modified, extended, renewed or replaced from
         time to time.

                  "Prime Rate" means the per annum rate of interest established
         from time to time by the Administrative Agent at its principal office
         in Charlotte, North Carolina (or such other principal office of the
         Administrative Agent as communicated in writing to the Borrower and the
         Lenders) as its Prime Rate. Any change in the interest rate resulting
         from a change in the Prime Rate shall become effective as of 12:01 a.m.
         of the Business Day on which each change in the Prime Rate is announced
         by the Administrative Agent. The Prime Rate is a reference rate used by
         the Administrative Agent in determining interest rates on certain loans
         and is not intended to be the lowest rate of interest charged on any
         extension of credit to any debtor.

                  "Quoted Rate" has the meaning set forth in Section 2.4.

                  "Quoted Rate Swing Line Loan" means a Swing Line Loan made
         with a Quoted Rate.



                                       18

<PAGE>



                  "Real Properties" has the meaning specified in Section 6.18.

                  "Regulation D, G, U, or X" means Regulation D, G, U or X,
         respectively, of the Board of Governors of the Federal Reserve System
         as from time to time in effect and any successor to all or a portion
         thereof.

                  "Rent Expense" means, for any period, with respect to the
         Credit Parties and their Subsidiaries on a consolidated basis, all rent
         payable under Operating Leases, as determined in accordance with GAAP.

                  "Reportable Event" means a "reportable event" as defined in
         Section 4043 of ERISA with respect to which the notice requirements to
         the PBGC have not been waived.

                  "Required Lenders" means Lenders whose aggregate Credit
         Exposure (as hereinafter defined) constitutes more than 50% of the
         Credit Exposure of all Lenders at such time; provided, however, that if
         any Lender shall be a Defaulting Lender at such time then there shall
         be excluded from the determination of Required Lenders the aggregate
         principal amount of Credit Exposure of such Lender at such time. For
         purposes of the preceding sentence, the term "Credit Exposure" as
         applied to each Lender shall mean (a) at any time prior to the
         termination of the Commitments, the Revolving Loan Commitment
         Percentage of such Lender multiplied by the Revolving Committed Amount
         and (b) at any time after the termination of the Commitments, the sum
         of (i) the principal balance of the outstanding Loans of such Lender
         plus (ii) such Lender's Participation Interests in the face amount of
         the outstanding Letters of Credit.

                  "Requirement of Law" means, as to any Person (who is not a
         Lender), the articles or certificate of incorporation and by-laws or
         other organizational or governing documents of such Person and as to
         any Person, any law, treaty, rule or regulation or final,
         non-appealable determination of an arbitrator or a court or other
         Governmental Authority, in each case applicable to or binding upon such
         Person or to which any of its material property is subject.

                  "Revolving Loan Commitment Percentage" means, for each Lender,
         the percentage identified as its Revolving Commitment Percentage on
         Schedule 1.1(a), as such percentage may be modified in connection with
         any assignment made in accordance with the provisions of Section 11.3.

                  "Revolving Committed Amount" means TWO HUNDRED FIFTY MILLION
         DOLLARS ($250,000,000) or such lesser amount as the Revolving Committed
         Amount may be reduced pursuant to Section 2.1(d).

                  "Revolving Loan Maturity Date" means November 25, 2001 or such
         earlier date if accelerated in accordance with Section 9.2.

                  "Revolving Loans" means the Revolving Loans made to the
         Borrower pursuant to Section 2.1.



                                       19

<PAGE>



                  "Revolving Note" or "Revolving Notes" means the promissory
         notes of the Borrower in favor of each of the Lenders evidencing the
         Revolving Loans provided pursuant to Section 2.1, individually or
         collectively, as appropriate, as such promissory notes may be amended,
         modified, supplemented, extended, renewed or replaced from time to time
         and as evidenced in the form of Exhibit 2.1(g).

                  "Rights Plan" means that certain Rights Agreement to be
         entered into between the Borrower and Harris Trust and Savings Bank.

                  "S&P" means Standard & Poor's Ratings Group, a division of
         McGraw Hill, Inc., or any successor or assignee of the business of such
         division in the business of rating securities.

                  "SEC Documents" means the Borrower's Registration Statement on
         Form 10, File No. 1-12213, filed with the Securities and Exchange
         Commission on September 23, 1996, as further amended by Amendment No.
         1, filed November 5, 1996, and Amendment No. 2, filed November 19, 1996
         and as it may be further amended and supplemented on or before the
         Effective Date.

                  "Securities Act" means the Securities Act of 1933, as amended,
         and the rules and regulations promulgated thereunder.

                  "Single Employer Plan" means any Plan which is covered by
         Title IV of ERISA, but which is not a Multiemployer Plan.

                  "Solvent" means, with respect to any Credit Party as of a
         particular date, that on such date (a) such Credit Party is able to pay
         its debts and other liabilities, contingent obligations and other
         commitments as they mature in the normal course of business, (b) such
         Credit Party does not intend to, and does not believe that it will,
         incur debts or liabilities beyond such Credit Party's ability to pay as
         such debts and liabilities mature in their ordinary course, (c) such
         Credit Party is not engaged in a business or a transaction, and is not
         about to engage in a business or a transaction, for which such Credit
         Party's assets would constitute unreasonably small capital after giving
         due consideration to the prevailing practice in the industry in which
         such Credit Party is engaged or is to engage, (d) the fair value of the
         assets of such Credit Party is greater than the total amount of
         liabilities, including, without limitation, contingent liabilities, of
         such Credit Party and (e) the present fair saleable value of the assets
         of such Credit Party is not less than the amount that will be required
         to pay the probable liability of such Credit Party on its debts as they
         become absolute and matured. The Calculation of Solvent for each Credit
         Party shall be made for such Credit Party and its Subsidiaries on a
         consolidated basis. Furthermore, (i) the assets of each Credit Party
         shall include, without limitation, goodwill and the rights and
         properties of such Credit Party pursuant to Section 4.8, to the extent
         of their fair value or fair saleable value, as applicable; and (ii)
         contingent liabilities, at any time, will be equal to the amount which,
         in light of all the facts and circumstances existing at such time,
         represents the amount that can reasonably be expected to become an
         actual or matured liability; it being understood that the contingent
         liabilities under the Tax Indemnification Agreements and the
         Transaction Agreement shall be assumed to be zero for the purpose of
         calculating whether any Credit Party is Solvent


                                       20

<PAGE>



         because, as of the Closing Date, each Credit Party believes that there
         is no reasonable expectation of any actual liability.

                  "Spin-Off" has the meaning set forth in Section 5.1(e).

                  "Subsidiary" means, as to any Person, (a) any corporation more
         than 50% of whose stock of any class or classes having by the terms
         thereof ordinary voting power to elect a majority of the directors of
         such corporation (irrespective of whether or not at the time, any class
         or classes of such corporation shall have or might have voting power by
         reason of the happening of any contingency) is at the time owned by
         such Person directly or indirectly through Subsidiaries, and (b) any
         partnership, association, joint venture, limited liability company or
         other entity in which such person directly or indirectly through
         Subsidiaries has more than a 50% equity interest at any time.

                  "Swing Line Loans" means the loans made by NationsBank
         pursuant to Section 2.4.

                  "Swing Line Committed Amount" means Ten Million Dollars
         ($10,000,000).

                  "Swing Line Loan Request" means a request by the Borrower for
         a Swing Line Loan in substantially the form of Exhibit 2.4(b).

                  "Swing Line Loan Note" means the promissory note of the
         Borrower in favor of NationsBank evidencing the Swing Line Loans
         provided pursuant to Section 2.4, as such promissory note may be
         amended, modified, supplemented, extended, renewed or replaced from
         time to time in and as evidenced by the form of Exhibit 2.4(e).

                  "Syndication Agent" means Wachovia Bank of Georgia, N.A.

                  "Tax Indemnification Agreements" means the Corning/Covance
         Spin-Off Tax Indemnification Agreement to be entered into between
         Corning Incorporated and the Borrower, the Covance/CCL Spin-Off Tax
         Indemnification Agreement to be entered into between the Borrower and
         Corning Clinical Laboratories Inc. and the CCL/Covance Spin-Off Tax
         Indemnification Agreement to be entered into between Corning Clinical
         Laboratories Inc. and the Borrower, each as it may be amended,
         supplemented or otherwise modified from time to time in accordance with
         its terms.

                  "Tax Sharing Agreement" means that certain Tax Sharing
         Agreement to be entered into by and among Corning Incorporated, Corning
         Clinical Laboratories Inc. and the Borrower, each as it may be amended,
         modified, supplemented or otherwise modified from time to time in
         accordance with its terms.

                  "Termination Event" means (a) with respect to any Single
         Employer Plan, the occurrence of a Reportable Event or the substantial
         cessation of operations (within the meaning of Section 4062(e) of
         ERISA); (b) the withdrawal of any Credit Party or any of its
         Subsidiaries or any ERISA Affiliate from a Multiple Employer Plan
         during a plan year in which it was a substantial employer (as such term
         is defined in Section 4001(a)(2) of


                                       21

<PAGE>



         ERISA), or the termination of a Multiple Employer Plan; (c) the
         distribution of a notice of intent to terminate or the actual
         termination of a Plan pursuant to Section 4041(a)(2) or 4041A of ERISA;
         (d) the institution of proceedings to terminate or the actual
         termination of a Plan by the PBGC under Section 4042 of ERISA; (e) any
         event or condition which might reasonably constitute grounds under
         Section 4042 of ERISA for the termination of, or the appointment of a
         trustee to administer, any Plan; or (f) the complete or partial
         withdrawal of any Credit Party or any of its Subsidiaries or any ERISA
         Affiliate from a Multiemployer Plan. For the purposes of subsections
         (d) and (e) of this definition, "ERISA Affiliate" means an entity,
         whether or not incorporated, which is under common control with any
         Credit Party or any of its Subsidiaries within the meaning of Section
         4001(a)(14) of ERISA, or is a member of a group which includes any
         Credit Party or any of its Subsidiaries and which is treated as a
         single employer under Section 414(b), (c), (m), or (o) of the Code;
         provided, however, that such definition shall apply only if such
         Termination Event could reasonably be expected to have a Material
         Adverse Effect. Otherwise, the definition of "ERISA Affiliate"
         generally applicable under this Credit Agreement shall apply.

                  "Transaction Agreement" means the Transaction Agreement to be
         entered into among Corning Incorporated, Corning Life Sciences Inc.,
         Corning Clinical Laboratories Inc. and the Borrower, as may be amended,
         supplemented or modified from time to time in accordance with its
         terms.

                  "U.S. Dollar Equivalent" means the amount of Dollars that
         would be realized by converting a Foreign Currency into Dollars using
         the arithmetic average of the spot buying rates for such Foreign
         Currency in Dollars as quoted to the Administrative Agent by three
         foreign exchange dealers of recognized standing in the United States
         selected by the Administrative Agent at approximately 10:00 a.m. on any
         day on which a computation thereof is required to be made hereunder.

                  "Voting Stock" of a corporation means, at any time, all
         classes of the capital stock of such corporation then outstanding and
         ordinarily entitled to vote in the election of directors.

         1.2 Computation of Time Periods and Other Definitional Provisions. For
purposes of computation of periods of time hereunder, the word "from" means
"from and including" and the words "to" and "until" each mean "to but
excluding." References in this Agreement to "Articles", "Sections", "Schedules"
or "Exhibits" shall be to Articles, Sections, Schedules or Exhibits of or to
this Agreement unless otherwise specifically provided.

         1.3 Accounting Terms. Except as otherwise expressly provided herein,
all accounting terms used herein shall be interpreted, and all financial
statements and certificates and reports as to financial matters required to be
delivered to the Lenders hereunder shall be prepared, in accordance with GAAP
applied on a consistent basis. All calculations made for the purposes of
determining compliance with this Credit Agreement shall (except as otherwise
expressly provided herein) be made by application of GAAP applied on a basis
consistent with the most recent annual or quarterly financial statements
delivered pursuant to Section 7.1 (or, prior to the delivery of the first
financial statements pursuant to Section 7.1, consistent with the financial
statements described in Section


                                       22

<PAGE>



5.1(c)); provided, however, if (a) the Borrower shall object to determining such
compliance on such basis at the time of delivery of such financial statements
due to any change in GAAP or the rules promulgated with respect thereto or (b)
either Agent or the Required Lenders shall so object in writing within 60 days
after delivery of such financial statements (or after the Lenders have been
informed of the change in GAAP affecting such financial statements, if later),
then for the period following such objection, unless otherwise agreed by the
Borrower and the Required Lenders, such calculations shall be made on a basis
consistent with the most recent financial statements delivered by the Borrower
to the Lenders as to which no such objection shall have been made.


                                    SECTION 2

                                CREDIT FACILITIES

         2.1      Revolving Loans.

                  (a) Revolving Loan Commitment. Subject to the terms and
         conditions set forth herein, each Lender severally agrees to make
         revolving loans (each a "Revolving Loan" and collectively the
         "Revolving Loans") to the Borrower, in Dollars or in Foreign Currency,
         at any time and from time to time, during the period from and including
         the Effective Date to but not including the Revolving Loan Maturity
         Date (or such earlier date if the Revolving Committed Amount has been
         terminated as provided herein); provided, however, that (i) the sum of
         the aggregate amount of Revolving Loans outstanding plus the aggregate
         amount of LOC Obligations outstanding plus the aggregate amount of
         Swing Line Loans outstanding plus the aggregate amount of Competitive
         Bid Loans outstanding shall not exceed the Revolving Committed Amount,
         (ii) with respect to each individual Lender, the Lender's pro rata
         share of outstanding Revolving Loans plus such Lender's pro rata share
         of outstanding LOC Obligations shall not exceed such Lender's Revolving
         Loan Commitment Percentage of the Revolving Committed Amount and (iii)
         the amount of Revolving Loans outstanding in Foreign Currency plus
         Competitive Bid Loans outstanding in Foreign Currency shall not exceed
         the U.S. Dollar Equivalent of Fifty Million Dollars ($50,000,000).
         Subject to the terms of this Credit Agreement (including Section 3.3),
         the Borrower may borrow, repay and reborrow Revolving Loans.

                  (b) Method of Borrowing for Revolving Loans. By no later than
         11:00 a.m. (i) one Business Day prior to the date of the requested
         borrowing of Revolving Loans that will be Base Rate Loans or (ii) three
         Business Days prior to the date of the requested borrowing of Revolving
         Loans that will be Eurocurrency Loans, the Borrower shall submit a
         written Notice of Borrowing in substantially the form of Exhibit 2.1(b)
         to the Administrative Agent setting forth (A) the amount requested, (B)
         whether such Revolving Loans shall accrue interest at the Base Rate or
         the Adjusted Eurocurrency Rate, (C) with respect to Revolving Loans
         that will be Eurocurrency Loans, the Interest Period applicable
         thereto, (D) whether the Revolving Loan is requested in Dollars or in a
         Foreign Currency and (E) certification that the Borrower has complied
         in all respects with Section 5.2. Notwithstanding the above, the
         Borrower may not request Revolving Loans made in a Foreign Currency to
         accrue interest at the Base Rate unless the Adjusted Eurocurrency Rate
         is not available.


                                       23

<PAGE>



                  (c) Funding of Revolving Loans. Upon receipt of a Notice of
         Borrowing, the Administrative Agent shall promptly inform the Lenders
         as to the terms thereof. Each Lender shall make its Revolving Loan
         Commitment Percentage of the requested Revolving Loans available to the
         Administrative Agent by 1:00 p.m. on the date specified in the Notice
         of Borrowing by deposit, in Dollars or the applicable Foreign Currency,
         of immediately available funds at the principal office of the
         Administrative Agent in Charlotte, North Carolina or at such other
         address as the Administrative Agent may designate in writing. The
         amount of the requested Revolving Loans will then be made available to
         the Borrower by the Administrative Agent by crediting the account of
         the Borrower on the books of such office of the Administrative Agent,
         to the extent the amount of such Revolving Loans are made available to
         the Administrative Agent.

                  No Lender shall be responsible for the failure or delay by any
         other Lender in its obligation to make Revolving Loans hereunder;
         provided, however, that the failure of any Lender to fulfill its
         obligations hereunder shall not relieve any other Lender of its
         obligations hereunder. Unless the Administrative Agent shall have been
         notified by any Lender prior to the time of any such Revolving Loan
         that such Lender does not intend to make available to the
         Administrative Agent its portion of the Revolving Loans to be made on
         such date, the Administrative Agent may assume that such Lender has
         made such amount available to the Administrative Agent on the date of
         such Revolving Loans, and the Administrative Agent in reliance upon
         such assumption, may (in its sole discretion but without any obligation
         to do so) make available to the Borrower a corresponding amount. If
         such corresponding amount is not in fact made available to the
         Administrative Agent, the Administrative Agent shall be able to recover
         such corresponding amount from such Lender. If such Lender does not pay
         such corresponding amount forthwith upon the Administrative Agent's
         demand therefor, the Administrative Agent will promptly notify the
         Borrower, and the Borrower shall immediately pay such corresponding
         amount to the Administrative Agent. The Administrative Agent shall also
         be entitled to recover from the Lender or the Borrower, as the case may
         be, interest on such corresponding amount in respect of each day from
         the date such corresponding amount was made available by the
         Administrative Agent to the Borrower to the date such corresponding
         amount is recovered by the Administrative Agent at a per annum rate
         equal to (i) from the Borrower at the applicable rate for such
         Revolving Loan pursuant to the Notice of Borrowing and (ii) from a
         Lender at the Federal Funds Rate.

                  (d) Reductions of Revolving Committed Amount. Upon at least
         three Business Days' notice, the Borrower shall have the right to
         permanently terminate or reduce the aggregate unused amount of the
         Revolving Committed Amount at any time or from time to time; provided
         that (i) each partial reduction shall be in an aggregate amount at
         least equal to $5,000,000 and in integral multiples of $1,000,000 above
         such amount and (ii) no reduction shall be made which would reduce the
         Revolving Committed Amount to an amount less than the aggregate amount
         of outstanding Revolving Loans plus the aggregate amount of outstanding
         LOC Obligations plus the aggregate amount of Swing Line Loans
         outstanding plus the aggregate amount of Competitive Bid Loans
         outstanding. Any reduction in (or termination of) the Revolving
         Committed Amount shall be permanent and may not be reinstated. The
         Administrative Agent shall immediately notify the Lenders of any
         reduction in the Revolving Committed Amount.


                                       24

<PAGE>



                  (e) Continuations and Conversions. Subject to the terms of
         Section 5.2 (other than Section 5.2(b)), the Borrower shall have the
         option, on any Business Day, to continue existing Eurocurrency Loans
         for a subsequent Interest Period, to convert Base Rate Loans into
         Eurocurrency Loans or to convert Eurocurrency Loans into Base Rate
         Loans; provided, however, that (i) each such continuation or conversion
         must be requested by the Borrower pursuant to a written Notice of
         Continuation/Conversion, in substantially the form of Exhibit 2.1(e),
         in compliance with the terms set forth below, (ii) except as provided
         in Section 3.11, Eurocurrency Loans may only be continued or converted
         into Base Rate Loans on the last day of the Interest Period applicable
         thereto, (iii) Eurocurrency Loans may not be continued nor may Base
         Rate Loans be converted into Eurocurrency Loans during the existence
         and continuation of a Default or Event of Default and (iv) any request
         to continue a Eurocurrency Loan that fails to comply with the terms
         hereof or any failure to request a continuation of a Eurocurrency Loan
         at the end of an Interest Period shall constitute a conversion to a
         Base Rate Loan on the last day of the applicable Interest Period. Each
         continuation or conversion must be requested by the Borrower no later
         than 11:00 a.m. (A) one Business Day prior to the date for a requested
         conversion of a Eurocurrency Loan to a Base Rate Loan or (B) three
         Business Days prior to the date for a requested continuation of a
         Eurocurrency Loan or conversion of a Base Rate Loan to a Eurocurrency
         Loan, in each case pursuant to a written Notice of
         Continuation/Conversion submitted to the Administrative Agent which
         shall set forth (x) whether the Borrower wishes to continue or convert
         such Loans and (y) if the request is to continue a Eurocurrency Loan or
         convert a Base Rate Loan to a Eurocurrency Loan, the Interest Period
         applicable thereto. Notwithstanding the foregoing, Loans made in
         Foreign Currency may not be continued or converted pursuant to this
         Section 2.1(e) but instead must be repaid at the end of the applicable
         Interest Period in the Foreign Currency in which such Loan was made.

                  (f) Minimum Amounts. Each request for a borrowing, conversion
         or continuation shall be subject to the requirements that (i) each
         Eurocurrency Loan shall be in a minimum amount of $5,000,000 and in
         integral multiples of $1,000,000 in excess thereof, or in the case of a
         Foreign Currency, the U.S. Dollar Equivalents of such amounts, (ii)
         each Base Rate Loan shall be in a minimum amount of the lesser of
         $1,000,000 (and integral multiples of $100,000 in excess thereof) or
         the remaining amount available under the Revolving Committed Amount, or
         in the case of a Foreign Currency, the U.S. Dollar Equivalents of such
         amounts and (iii) no more than eight Eurocurrency Loans shall be
         outstanding hereunder at any one time. For the purposes of this
         Section, all Eurocurrency Loans with the same Interest Periods shall be
         considered as one Eurocurrency Loan, but Eurocurrency Loans with
         different Interest Periods, even if they begin on the same date, shall
         be considered as separate Eurocurrency Loans.

                  (g) Notes. The Revolving Loans made by each Lender shall be
         evidenced by a duly executed promissory note of the Borrower to each
         applicable Lender in the face amount of its Revolving Loan Commitment
         Percentage of the Revolving Committed Amount in substantially the form
         of Exhibit 2.1(g).



                                       25

<PAGE>



         2.2      Letter of Credit Subfacility.

                  (a) Issuance. Subject to the terms and conditions hereof and
         of the LOC Documents, if any, and any other terms and conditions which
         the Issuing Lender may reasonably require (so long as such terms and
         conditions do not impose any financial obligation on or require any
         Lien (not otherwise contemplated by this Agreement) to be given by any
         Credit Party or conflict with any obligation of, or detract from any
         action which may be taken by, any Credit Party or their Subsidiaries
         under this Agreement), the Issuing Lender shall from time to time upon
         request issue (from the Effective Date to the Revolving Loan Maturity
         Date and in a form reasonably acceptable to the Issuing Lender), in
         Dollars, and the LOC Participants shall participate in, letters of
         credit (the "Letters of Credit") for the account of the Borrower or any
         of its Subsidiaries; provided, however, that (i) the aggregate amount
         of LOC Obligations shall not at any time exceed the LOC Committed
         Amount, (ii) the sum of the aggregate amount of LOC Obligations
         outstanding plus Revolving Loans outstanding plus Swing Line Loans
         outstanding plus Competitive Bid Loans outstanding shall not exceed the
         Revolving Committed Amount and (iii) with respect to each individual
         LOC Participant, the LOC Participant's pro rata share of outstanding
         Revolving Loans plus its pro rata share of outstanding LOC Obligations
         shall not exceed such LOC Participant's Revolving Loan Commitment
         Percentage of the Revolving Committed Amount. The issuance and expiry
         date of each Letter of Credit shall be a Business Day. Except as
         otherwise expressly agreed upon by all the LOC Participants, each
         Letter of Credit shall have an original expiry date not more than one
         year from the date of issuance; provided that, at the option of the
         Borrower, Letters of Credit may be subject to automatic renewal for
         periods not in excess of one year subject to the conditions that (x)
         the Issuing Lender may give notice to the Borrower not less than 60
         days prior to the effective date of such extension that it will not
         extend such Letter of Credit (and, during the existence and
         continuation of an Event of Default, the Issuing Lender agrees to give
         such notice if instructed by the Required Lenders to do so) and (y) no
         Letter of Credit (or renewal thereof), shall have an expiry date
         extending beyond the Revolving Loan Maturity Date. Each Letter of
         Credit shall be either (x) a standby letter of credit issued to support
         the obligations (including pension or insurance obligations),
         contingent or otherwise, of the Borrower or any of its Subsidiaries, or
         (y) a commercial letter of credit in respect of the purchase of goods
         or services by the Borrower or any of its Subsidiaries in the ordinary
         course of business. Each Letter of Credit shall comply with the related
         LOC Documents.

                  (b) Notice and Reports. The request for the issuance or
         renewal of a Letter of Credit shall be submitted to the Issuing Lender
         at least three Business Days prior to the requested date of issuance or
         renewal. The Issuing Lender will, at least quarterly and more
         frequently upon request, provide to the Administrative Agent for
         dissemination to the Lenders a detailed report specifying the Letters
         of Credit which are then issued and outstanding and any activity with
         respect thereto which may have occurred since the date of the prior
         report, and including therein, among other things, the account party,
         the beneficiary, the face amount, and the expiry date as well as any
         payments or expirations which may have occurred. The Issuing Lender
         will further provide to the Administrative Agent, promptly upon
         request, copies of the Letters of Credit and the other LOC Documents.



                                       26

<PAGE>



                  (c) Participations. Each LOC Participant, upon issuance of a
         Letter of Credit, shall be deemed to have purchased without recourse a
         risk participation from the Issuing Lender in such Letter of Credit and
         each LOC Document related thereto and the rights and obligations
         arising thereunder and any collateral relating thereto, in each case in
         an amount equal to its Revolving Loan Commitment Percentage of the
         obligations under such Letter of Credit, and shall absolutely,
         unconditionally and irrevocably assume, as primary obligor and not as
         surety, and be obligated to pay to the Issuing Lender therefor and
         discharge when due, its Revolving Loan Commitment Percentage of the
         obligations arising under such Letter of Credit. Without limiting the
         scope and nature of each LOC Participant's participation in any Letter
         of Credit, to the extent that the Issuing Lender has not been
         reimbursed as required hereunder or under any such Letter of Credit,
         each such LOC Participant shall pay to the Issuing Lender its Revolving
         Loan Commitment Percentage of such unreimbursed drawing in same day
         funds on the day of notification by the Issuing Lender of an
         unreimbursed drawing pursuant to the provisions of subsection (d)
         hereof. The obligation of each LOC Participant to so reimburse the
         Issuing Lender shall be absolute and unconditional and shall not be
         affected by the occurrence of a Default, an Event of Default or any
         other occurrence or event. Any such reimbursement shall not relieve or
         otherwise impair the obligation of the Borrower or any other Credit
         Party to reimburse the Issuing Lender under any Letter of Credit,
         together with interest as hereinafter provided.

                  (d) Reimbursement. In the event of any drawing under any
         Letter of Credit, the Issuing Lender will promptly notify the Borrower.
         Unless the Borrower shall immediately notify the Issuing Lender of its
         intent to otherwise reimburse the Issuing Lender, the Borrower shall be
         deemed to have requested a Revolving Loan in Dollars at the Base Rate
         in the amount of the drawing as provided in subsection (e) hereof, the
         proceeds of which will be used to satisfy the reimbursement
         obligations. The Borrower shall reimburse the Issuing Lender on the day
         of drawing (unless such notice is received after 1:00 p.m. on such day
         and then on the next succeeding Business Day with the outstanding
         amount accruing interest at the Base Rate until reimbursed) under any
         Letter of Credit either with the proceeds of a Revolving Loan obtained
         hereunder or otherwise in same day funds as provided herein or in the
         LOC Documents. If the Borrower shall fail to reimburse the Issuing
         Lender as provided hereinabove, the unreimbursed amount of such drawing
         shall bear interest at a per annum rate equal to the Base Rate plus two
         percent (2%). The Borrower's reimbursement obligations hereunder shall
         be absolute and unconditional under all circumstances irrespective of
         (but without waiver of) any rights of set-off, counterclaim or defense
         to payment that the applicable account party or the Borrower may claim
         or have against the Issuing Lender, the Agents, the Lenders, the
         beneficiary of the Letter of Credit drawn upon or any other Person,
         including without limitation, any defense based on any failure of the
         applicable account party, the Borrower or any other Credit Party to
         receive consideration or the legality, validity, regularity or
         unenforceability of the Letter of Credit. The Issuing Lender will
         promptly notify the LOC Participants of the amount of any unreimbursed
         drawing and each LOC Participant shall promptly pay to the
         Administrative Agent for the account of the Issuing Lender, in Dollars
         and in immediately available funds, the amount of such LOC
         Participant's Revolving Loan Commitment Percentage of such unreimbursed
         drawing. Such payment shall be made on the day such notice is received
         by such Lender from the Issuing Lender if such notice is received at or
         before 2:00 p.m., otherwise such


                                       27

<PAGE>



         payment shall be made at or before 12:00 Noon on the Business Day next
         succeeding the day such notice is received. If such LOC Participant
         does not pay such amount to the Issuing Lender in full upon such
         request, such LOC Participant shall, on demand, pay to the
         Administrative Agent for the account of the Issuing Lender interest on
         the unpaid amount during the period from the date the LOC Participant
         received the notice regarding the unreimbursed drawing until such LOC
         Participant pays such amount to the Issuing Lender in full at a rate
         per annum equal to, if paid within two Business Days of the date of
         drawing, the Federal Funds Rate and thereafter at a rate equal to the
         Base Rate. Each LOC Participant's obligation to make such payment to
         the Issuing Lender, and the right of the Issuing Lender to receive the
         same, shall be absolute and unconditional, shall not be affected by any
         circumstance whatsoever and without regard to the termination of this
         Credit Agreement or the Commitments hereunder, the existence of a
         Default or Event of Default or the acceleration of the obligations
         hereunder and shall be made without any offset, abatement, withholding
         or reduction whatsoever. Simultaneously with the making of each such
         payment by a LOC Participant to the Issuing Lender, such LOC
         Participant shall, automatically and without any further action on the
         part of the Issuing Lender or such LOC Participant, acquire a
         participation in an amount equal to such payment (excluding the portion
         of such payment constituting interest owing to the Issuing Lender) in
         the related unreimbursed drawn portion of the LOC Obligation and in the
         interest thereon and in the related LOC Documents, and shall have a
         claim against the Borrower and the other Credit Parties with respect
         thereto (including the reimbursement obligation).

                  (e) Repayment with Revolving Loans. On any day on which the
         Borrower shall have requested, or been deemed to have requested, a
         Revolving Loan borrowing to reimburse a drawing under a Letter of
         Credit, the Administrative Agent shall give notice to the applicable
         Lenders that a Revolving Loan has been requested or deemed requested in
         connection with a drawing under a Letter of Credit, in which case a
         Revolving Loan borrowing comprised solely of Base Rate Loans in Dollars
         (each such borrowing, a "Mandatory Borrowing") shall be immediately
         made from all applicable Lenders (without giving effect to any
         termination of the Commitments pursuant to Section 9.2) pro rata based
         on each Lender's respective Revolving Loan Commitment Percentage and
         the proceeds thereof shall be paid directly to the Issuing Lender for
         application to the respective LOC Obligations. Each such Lender hereby
         irrevocably agrees to make such Revolving Loans immediately upon any
         such request or deemed request on account of each such Mandatory
         Borrowing in the amount and in the manner specified in the preceding
         sentence and on the same such date notwithstanding (i) the amount of
         Mandatory Borrowing may not comply with the minimum amount for
         borrowings of Revolving Loans otherwise required hereunder, (ii)
         whether any conditions specified in Section 5 are then satisfied, (iii)
         whether a Default or Event of Default then exists, (iv) failure of any
         such request or deemed request for Revolving Loans to be made by the
         time otherwise required hereunder, (v) the date of such Mandatory
         Borrowing, or (vi) any reduction in the Revolving Committed Amount or
         any termination of the Commitments. In the event that any Mandatory
         Borrowing cannot for any reason be made on the date otherwise required
         above (including, without limitation, as a result of the commencement
         of a proceeding under the Bankruptcy Code with respect to the Borrower
         or any other Credit Party), then each such Lender hereby agrees that it
         shall forthwith fund (as of the date the Mandatory Borrowing would
         otherwise have occurred, but


                                       28

<PAGE>



         adjusted for any payments received from the Borrower on or after such
         date and prior to such purchase) its Participation Interest in the
         outstanding LOC Obligations; provided that in the event any Lender
         shall fail to fund its Participation Interest on the day the Mandatory
         Borrowing would otherwise have occurred, then the amount of such
         Lender's unfunded Participation Interest therein shall bear interest
         payable to the Issuing Lender upon demand, at the rate equal to, if
         paid within two Business Days of such date, the Federal Funds Rate, and
         thereafter at a rate equal to the Base Rate.

                  (f) Modification and Extension. The issuance of any
         supplement, modification or amendment, renewal, or extensions
         (excluding extensions on an "evergreen" basis pursuant to Section
         2.2(a)) to any Letter of Credit shall, for purposes hereof, be treated
         in all respects the same as the issuance of a new Letter of Credit
         hereunder.

                  (g) Uniform Customs and Practices. The Issuing Lender may have
         the Letters of Credit be subject to The Uniform Customs and Practice
         for Documentary Credits, as published as of the date of issue by the
         International Chamber of Commerce (Publication No. 500 or the most
         recent publication, the "UCP"), in which case the UCP may be
         incorporated therein and deemed in all respects to be a part thereof.

                  (h) Responsibility of Issuing Lender. It is expressly
         understood and agreed as between the Lenders that the obligations of
         the Issuing Lender hereunder to the LOC Participants are only those
         expressly set forth in this Credit Agreement and that the Issuing
         Lender shall be entitled to assume that the conditions precedent set
         forth in Section 5 have been satisfied unless it shall have acquired
         actual knowledge that any such condition precedent has not been
         satisfied; provided, however, that nothing set forth in this Section
         2.2 shall be deemed to prejudice the right of any LOC Participant to
         recover from the Issuing Lender any amounts made available by such LOC
         Participant to the Issuing Lender pursuant to this Section 2.2 in the
         event that it is determined by a court of competent jurisdiction that
         the payment with respect to a Letter of Credit constituted gross
         negligence or willful misconduct on the part of the Issuing Lender.

                  (i) Conflict with LOC Documents. In the event of any conflict
         between this Credit Agreement and any LOC Document, this Credit
         Agreement shall govern.

                  (j)      Indemnification of Issuing Lender.

                                  (i) In addition to its other obligations under
                  this Credit Agreement, the Borrower hereby agrees to protect,
                  indemnify, pay and save the Issuing Lender harmless from and
                  against any and all claims, demands, liabilities, damages,
                  losses, costs, charges and expenses (including reasonable
                  attorneys' fees) that the Issuing Lender may incur or be
                  subject to as a consequence, direct or indirect, of (A) the
                  issuance of any Letter of Credit or (B) the failure of the
                  Issuing Lender to honor a drawing under a Letter of Credit as
                  a result of any act or omission, whether rightful or wrongful,
                  of any present or future de jure or de facto government or
                  governmental authority (all such acts or omissions, herein
                  called "Government Acts").


                                       29

<PAGE>



                                 (ii) As between the Borrower and the Issuing
                  Lender, the Borrower shall assume all risks of the acts,
                  omissions or misuse of any Letter of Credit by the beneficiary
                  thereof. The Issuing Lender shall not be responsible for
                  (except in the case of (A), (B) and (C) below if the Issuing
                  Lender has actual knowledge to the contrary): (A) the form,
                  validity, sufficiency, accuracy, genuineness or legal effect
                  of any document submitted by any party in connection with the
                  application for and issuance of any Letter of Credit, even if
                  it should in fact prove to be in any or all respects invalid,
                  insufficient, inaccurate, fraudulent or forged; (B) the
                  validity or sufficiency of any instrument transferring or
                  assigning or purporting to transfer or assign any Letter of
                  Credit or the rights or benefits thereunder or proceeds
                  thereof, in whole or in part, that may prove to be invalid or
                  ineffective for any reason; (C) failure of the beneficiary of
                  a Letter of Credit to comply fully with conditions required in
                  order to draw upon a Letter of Credit; (D) errors, omissions,
                  interruptions or delays in transmission or delivery of any
                  messages, by mail, cable, telegraph, telex or otherwise,
                  whether or not they be in cipher; (E) errors in interpretation
                  of technical terms; (F) any loss or delay in the transmission
                  or otherwise of any document required in order to make a
                  drawing under a Letter of Credit or of the proceeds thereof;
                  and (G) any consequences arising from causes beyond the
                  control of the Issuing Lender, including, without limitation,
                  any Government Acts. None of the above shall affect, impair,
                  or prevent the vesting of the Issuing Lender's rights or
                  powers hereunder.

                                (iii) In furtherance and extension and not in
                  limitation of the specific provisions hereinabove set forth,
                  any action taken or omitted by the Issuing Lender, under or in
                  connection with any Letter of Credit or the related
                  certificates, if taken or omitted in good faith, shall not put
                  the Issuing Lender under any resulting liability to the
                  Borrower or any other Credit Party. It is the intention of the
                  parties that this Credit Agreement shall be construed and
                  applied to protect and indemnify the Issuing Lender against
                  any and all risks involved in the issuance of the Letters of
                  Credit, all of which risks are hereby assumed by the Borrower,
                  including, without limitation, any and all risks of the acts
                  or omissions, whether rightful or wrongful, of any present or
                  future Government Acts. The Issuing Lender shall not, in any
                  way, be liable for any failure by the Issuing Lender or anyone
                  else to pay any drawing under any Letter of Credit as a result
                  of any Government Acts or any other cause beyond the control
                  of the Issuing Lender.

                                 (iv) Nothing in this subsection (j) is intended
                  to limit the reimbursement obligation of the Borrower
                  contained in this Section 2.2. The obligations of the Borrower
                  under this subsection (j) shall survive the termination of
                  this Credit Agreement. No act or omission of any current or
                  prior beneficiary of a Letter of Credit shall in any way
                  affect or impair the rights of the Issuing Lender to enforce
                  any right, power or benefit under this Credit Agreement.

                                  (v) Notwithstanding anything to the contrary
                  contained in this subsection (j), the Borrower shall have no
                  obligation to indemnify the Issuing Lender in respect of any
                  liability incurred by the Issuing Lender arising solely out of
                  the


                                       30

<PAGE>



                  gross negligence or willful misconduct of the Issuing Lender,
                  as determined by a court of competent jurisdiction. Nothing in
                  this Agreement shall relieve the Issuing Lender of any
                  liability to the Borrower in respect of any action taken by
                  the Issuing Lender which action constitutes gross negligence
                  or willful misconduct of the Issuing Lender or a violation of
                  the UCP or Uniform Commercial Code (as applicable), as
                  determined by a court of competent jurisdiction. The Borrower
                  shall have a claim against the Issuing Lender, and the Issuing
                  Lender shall be liable to the Borrower, to the extent of any
                  direct, but not consequential, damages suffered by the
                  Borrower that the Borrower proves were caused by (i) the
                  Issuing Lender's willful misconduct or gross negligence in
                  determining whether documents presented under any Letter of
                  Credit comply with the terms of the Letter of Credit or (ii)
                  the Issuing Lender's willful failure to make lawful payment
                  under a Letter of Credit after the presentation to it of a
                  draft and certificates strictly complying with the terms and
                  conditions of the Letter of Credit.

         2.3      Competitive Bid Loans Subfacility.

                  (a) Competitive Bid Loans. Subject to the terms and conditions
         set forth herein, the Borrower may, from time to time, during the
         period from and including the Effective Date to but not including the
         Revolving Loan Maturity Date, request and each Lender may, in its sole
         discretion, agree to make Competitive Bid Loans, in Dollars or in
         Foreign Currency, to the Borrower; provided, however, that (i) the sum
         of the Revolving Loans outstanding plus Competitive Bid Loans
         outstanding plus Swing Line Loans outstanding plus the aggregate amount
         of LOC Obligations outstanding, shall not exceed the Revolving
         Committed Amount, (ii) if a Lender does make a Competitive Bid Loan it
         shall not reduce such Lender's obligation to make its pro rata share of
         any Revolving Loan, and (iii) the amount of Revolving Loans outstanding
         in Foreign Currency plus Competitive Bid Loans outstanding in Foreign
         Currency shall not exceed the U.S. Dollar Equivalent of Fifty Million
         Dollars ($50,000,000).

                  (b) Competitive Bid Requests. The Borrower may solicit
         Competitive Bids by delivery of a Competitive Bid Loan Request to the
         Administrative Agent by 10:00 a.m. on a Business Day not less than (x)
         in the case of Fixed Rate Competitive Loans not made in a Foreign
         Currency, three Business Days and (y) in the case of Eurocurrency
         Competitive Loans and Fixed Rate Competitive Loans made in a Foreign
         Currency, five Business Days prior to the date of a requested
         Competitive Bid Loan. A Competitive Bid Loan Request must be
         substantially in the form of Exhibit 2.3(b) and shall specify (i) the
         date of the requested Competitive Bid Loan (which shall be a Business
         Day), (ii) the amount of the requested Competitive Bid Loan, (iii) the
         applicable Interest Periods requested (iv) whether such Competitive Bid
         Loan will be a Eurocurrency Competitive Loan or a Fixed Rate
         Competitive Loan, and (v) whether such Competitive Bid Loan is to be
         made in Dollars or in Foreign Currency and shall be accompanied by the
         Competitive Bid Request Fee set forth in the Fee Letter and shall
         comply in all respects with Section 5.2. The Administrative Agent shall
         notify the Lenders of its receipt of a Competitive Bid Request and the
         contents thereof and invite the Lenders to submit Competitive Bids in
         response thereto. The Borrower may not request a Competitive Bid for
         more than three different Interest Periods


                                       31

<PAGE>



         per Competitive Bid Request and Competitive Bid Requests may be made no
         more frequently than once every five Business Days.

                  (c) Competitive Bid Procedure. Each Lender may, in its sole
         discretion, make one or more Competitive Bids to the Borrower in
         response to a Competitive Bid Request. Each Competitive Bid must be
         received by the Administrative Agent not later than 10:00 a.m. (x) in
         the case of Fixed Rate Competitive Loans not made in a Foreign Currency
         on the proposed date of a Competitive Bid Loan advance and (y) in the
         case of Eurocurrency Competitive Loans and Fixed Rate Competitive Loans
         made in a Foreign Currency, three Business Days prior to the proposed
         dated of a Competitive Bid Loan advance; provided, however, that should
         the Administrative Agent, in its capacity as a Lender, desire to submit
         a Competitive Bid it shall notify the Borrower of its Competitive Bid
         and the terms thereof not later than 9:30 a.m. on such date. A Lender
         may offer to make all or part of the requested Competitive Bid Loan and
         may submit multiple Competitive Bids in response to a Competitive Bid
         Request. The Competitive Bid must specify (i) the particular
         Competitive Bid Request as to which the Competitive Bid is submitted,
         (ii) the minimum (which shall be not less than $1,000,000 and integral
         multiples of $500,000 in excess thereof, or in the case of a Foreign
         Currency, the U.S. Dollar Equivalent), and maximum principal amounts of
         the requested Competitive Bid Loan or Loans as to which the Lender is
         willing to make, (iii) the applicable interest rate or rates (which (A)
         in the case of a Eurocurrency Competitive Loan, shall be the
         Eurocurrency Rate for the Interest Period in effect for such Loan plus
         the margin offered by such Lender and accepted by the Borrower and (B)
         in the case of a Fixed Rate Competitive Loan, shall be a fixed rate per
         annum (computed on the basis of a 360-day year or the actual number of
         days elapsed) offered by such Lender and accepted by the Borrower) (the
         "Fixed Rate") and Interest Period or Interest Periods therefor, (iv)
         whether such Competitive Bid Loan will be a Eurocurrency Competitive
         Loan or a Fixed Rate Competitive Loan and (v) the currency in which the
         Competitive Bid is made. A Competitive Bid submitted by a Lender in
         accordance with the provisions hereof shall be irrevocable. The
         Administrative Agent shall promptly notify the Borrower of all
         Competitive Bids made and the terms thereof and shall send a copy of
         each of the Competitive Bids to the Borrower for its records as soon as
         practicable.

                  (d) Acceptance of Competitive Bids. The Borrower may, in its
         sole discretion, subject only to the provisions of this subsection (d),
         accept or refuse any Competitive Bid offered to it. To accept a
         Competitive Bid, the Borrower shall give telephonic notification of its
         acceptance of any or all such Competitive Bids to the Administrative
         Agent by 11:00 a.m. on the proposed date of a Competitive Bid Loan
         which shall be promptly confirmed in writing; provided, however, (i)
         the failure by the Borrower to give timely notice of its acceptance of
         a Competitive Bid shall be deemed to be a refusal thereof, (ii) to the
         extent Competitive Bids are for comparable Interest Periods, the
         Borrower may accept Competitive Bids only in ascending order of rates,
         (iii) the aggregate amount of Competitive Bids accepted by the Borrower
         shall not exceed the principal amount specified in the Competitive Bid
         Request, (iv) if the Borrower shall accept a bid or bids made at a
         particular Competitive Bid Rate, but the amount of such bid or bids
         shall cause the total amount of bids to be accepted by the Borrower to
         be in excess of the amount specified in the Competitive Bid Request,
         then the Borrower shall accept a portion of such bid or bids in an
         amount equal to


                                       32

<PAGE>



         the amount specified in the Competitive Bid Request less the amount of
         all other Competitive Bids accepted with respect to such Competitive
         Bid Request, which acceptance shall be made pro rata in accordance with
         the amount of each such bid at such Competitive Bid Rate and (v) no bid
         shall be accepted for a Competitive Bid Loan unless such Competitive
         Bid Loan is in a minimum principal amount of $1,000,000 and integral
         multiples of $500,000 in excess thereof or in the case of a Foreign
         Currency, the U.S. Dollar equivalent, except that where a portion of a
         Competitive Bid is accepted in accordance with the provisions of
         subsection (iv) hereof, then in a minimum principal amount of $100,000
         and integral multiples of $100,000 (but not in any event less than the
         minimum amount specified in the Competitive Bid), and in calculating
         the pro rata allocation of acceptances of portions of multiple bids at
         a particular Competitive Bid Rate pursuant to subsection (iv) hereof,
         the amounts shall be rounded to integral multiples of $100,000, or in
         the case of a Foreign Currency, the U.S. Dollar equivalent, in a manner
         which shall be in the discretion of the Borrower. A notice of
         acceptance of a Competitive Bid given by the Borrower in accordance
         with the provisions hereof shall be irrevocable. The Administrative
         Agent shall, not later than 1:00 p.m. on the date of receipt from the
         Borrower of its acceptance or rejection of Competitive Bid, notify each
         bidding Lender whether or not its Competitive Bid has been accepted
         (and if so, in what amount and at what Competitive Bid Rate), and each
         successful bidder will thereupon become bound, subject to the other
         applicable conditions hereof, to make the Competitive Bid Loan in
         respect of which its bid has been accepted.

                  (e) Funding of Competitive Bid Loans. Each Lender that is to
         make a Competitive Bid Loan shall make its Competitive Bid Loan
         available to the Administrative Agent by 2:00 P.M. on the date
         specified in the Competitive Bid Request by deposit in Dollars or the
         applicable Foreign Currency of immediately available funds at the
         office of the Administrative Agent in Charlotte, North Carolina, or at
         such other address as the Administrative Agent may designate in
         writing. The Administrative Agent will, upon receipt, make the proceeds
         of such Competitive Bid Loans available to the Borrower.

                  (f) Maturity of Competitive Bid Loans. Each Competitive Bid
         Loan shall mature and be due and payable in full, in the currency in
         which made, on the last day of the Interest Period applicable thereto.
         Unless the Borrower shall give notice to the Administrative Agent
         otherwise, or a Default or Event of Default exists and is continuing,
         on the Business Day prior to the last day of the applicable Interest
         Period of a maturing Competitive Bid Loan, the Borrower shall be deemed
         to have requested from all of the Lenders Revolving Loans in Dollars in
         the amount of such maturing Competitive Bid Loan, accruing interest at
         the Base Rate, the proceeds of which will be used to repay such
         Competitive Bid Loan.

                  (g) Minimum Amounts. Each Competitive Bid Loan shall be in an
         amount not less than $1,000,000 and in integral multiples of $100,000
         thereof.

                  (h) Competitive Bid Loan Notes. The Competitive Bid Loans made
         by each Lender shall be evidenced by a duly executed promissory note of
         the Borrower to such Lender in the original principal amount of the
         Revolving Committed Amount and in substantially the form of Exhibit
         2.3(h).



                                       33

<PAGE>



         2.4      Swing Line Loans Subfacility.

                  (a) Swing Line Loans. NationsBank hereby agrees, on the terms
         and subject to the conditions set forth herein and in the other Credit
         Documents, to make loans to the Borrower in Dollars at any time and
         from time to time during the period from and including the Effective
         Date to but not including the Revolving Loan Maturity Date (each such
         loan, a "Swing Line Loan" and collectively, the "Swing Line Loans");
         provided that (i) the aggregate principal amount of the Swing Line
         Loans outstanding at any one time shall not exceed the Swing Line
         Committed Amount and (ii) the sum of Swing Line Loans outstanding plus
         Revolving Loans outstanding plus Competitive Bid Loans outstanding plus
         the aggregate amount of LOC Obligations outstanding shall not exceed
         the Revolving Committed Amount. Prior to the Revolving Loan Maturity
         Date, Swing Line Loans may be repaid and reborrowed by the Borrower in
         accordance with the provisions hereof. Upon the request of any Lender,
         NationsBank shall provide such Lender a schedule of Swing Line Loans
         then outstanding.

                  (b) Method of Borrowing and Funding Swing Line Loans. By no
         later than 10:00 a.m., on the date of the requested borrowing of Swing
         Line Loans, the Borrower shall submit a Swing Line Loan Request to
         NationsBank in the form of Exhibit 2.4(b) setting forth (i) the amount
         of the requested Swing Line Loan, (ii) the date of the requested Swing
         Line Loan and (iii) whether such Swing Line Loan is to be a Base Rate
         Loan or a Quoted Rate Swing Line Loan and if it is a Quoted Rate Swing
         Line Loan, the applicable Interest Period and complying in all respects
         with Section 5.2. If the Borrower has requested a Quoted Rate Swing
         Line Loan, NationsBank shall provide to the Borrower, no later than
         1:00 p.m. on the date of the request, the rate at which NationsBank
         would be willing to provide such Swing Line Loan (the "Quoted Rate").
         The Borrower shall notify NationsBank by 2:00 p.m. on such date whether
         it wishes to accept the Quoted Rate. Failure of the Borrower to timely
         accept the Quoted Rate shall make the Quoted Rate and the corresponding
         Swing Line Loan Request void.

                  (c) Repayment and Participations of Swing Line Loans. The
         Borrower agrees to repay all Swing Line Loans that are Base Rate Loans
         within one Business Day of demand therefor by NationsBank and all Swing
         Line Loans that are Quoted Rate Swing Line Loans at the end of the
         applicable Interest Period. Each repayment of a Swing Line Loan may be
         accomplished by requesting Revolving Loans which request is not subject
         to the conditions set forth in Section 5.2(b). In the event that the
         Borrower shall fail to timely repay any Swing Line Loan, and in any
         event upon (i) a request by NationsBank, (ii) the occurrence of an
         Event of Default described in Section 9.1(f) or (iii) the acceleration
         of any Loan or termination of any Commitment pursuant to Section 9.2,
         each other Lender shall irrevocably and unconditionally purchase from
         NationsBank, without recourse or warranty, an undivided interest and
         participation in such Swing Line Loan in an amount equal to such other
         Lender's Revolving Loan Commitment Percentage thereof, by directly
         purchasing a participation in such Swing Line Loan in such amount
         (regardless of whether the conditions precedent thereto set forth in
         Section 5.2 hereof are then satisfied, whether or not the Borrower has
         submitted a Notice of Borrowing and whether or not the Commitments are
         then in effect, any Event of Default exists or all the Loans have been
         accelerated) and paying the proceeds


                                       34

<PAGE>



         thereof to NationsBank at the address provided in Section 11.1, or at
         such other address as NationsBank may designate, in Dollars and in
         immediately available funds. If such amount is not in fact made
         available to NationsBank by any Lender, NationsBank shall be entitled
         to recover such amount on demand from such Lender, together with
         accrued interest thereon for each day from the date of demand thereof,
         at the Federal Funds Rate. If such Lender does not pay such amount
         forthwith upon NationsBank's demand therefor, and until such time as
         such Lender makes the required payment, NationsBank shall be deemed to
         continue to have outstanding Swing Line Loans in the amount of such
         unpaid participation obligation for all purposes of the Credit
         Documents other than those provisions requiring the other Lenders to
         purchase a participation therein. Further, such Lender shall be deemed
         to have assigned any and all payments made of principal and interest on
         its Loans, and any other amounts due to it hereunder to NationsBank to
         fund Swing Line Loans in the amount of the participation in Swing Line
         Loans that such Lender failed to purchase pursuant to this Section
         2.4(c) until such amount has been purchased (as a result of such
         assignment or otherwise).

                  (d) Minimum Amounts. Each Swing Line Loan shall be in the
         minimum amount of $100,000 and in integral multiples of $50,000 in
         excess thereof.

                  (e) Swing Line Note. The Swing Line Loans made by NationsBank
         shall be evidenced by a duly executed promissory note of the Borrower
         to NationsBank in the face amount of the Swing Line Committed Amount
         and in substantially the form of Exhibit 2.4(e).

         2.5 Currency Equivalents. For purposes of determining compliance with
Section 2.1 and Section 3.3(b), the amount of each Loan outstanding in a Foreign
Currency: (a) shall be converted to its U.S. Dollar Equivalent on the date of
the initial Notice of Borrowing or Competitive Bid Loan Request with respect
thereto and on the date of each Notice of Continuation/Conversion or Competitive
Bid Loan Request requesting a new Interest Period therefor and (b) from and
after any such date, shall be deemed to remain equivalent to the U.S. Dollar
Equivalent determined in accordance with clause (a) notwithstanding any
fluctuation in exchange rates occurring thereafter.


                                    SECTION 3

          GENERAL PROVISIONS APPLICABLE TO LOANS AND LETTERS OF CREDIT

         3.1      Interest.

                  (a) Interest Rate. All Revolving Loans that are Base Rate
         Loans shall accrue interest at the Base Rate. All Swing Line Loans
         shall accrue interest at the Base Rate unless such Swing Line Loan is a
         Quoted Rate Swing Line Loan then at the Quoted Rate applicable thereto.
         All Competitive Bid Loans shall accrue interest at the Competitive Bid
         Rate applicable thereto. All Revolving Loans that are Eurocurrency
         Loans shall accrue interest at the Adjusted Eurocurrency Rate.



                                       35

<PAGE>



                  (b) Default Rate of Interest. Upon the occurrence, and during
         the continuance, of an Event of Default, the principal of and, to the
         extent permitted by law, interest on the Loans and any other amounts
         owing hereunder or under the other Credit Documents (including without
         limitation fees and expenses) shall bear interest, payable on demand,
         at a per annum rate equal to (i) two percent (2%) plus the rate which
         would otherwise be applicable or (ii) if no rate is applicable, the
         Base Rate plus two percent (2%).

                  (c) Interest Payments. Interest on Loans shall be due and
         payable in arrears on each Interest Payment Date. If an Interest
         Payment Date falls on a date which is not a Business Day, such Interest
         Payment Date shall be deemed to be the next succeeding Business Day,
         except that in the case of Eurocurrency Loans where the next succeeding
         Business Day falls in the next succeeding calendar month, then on the
         next preceding Business Day.

         3.2 Place and Manner of Payments. All payments of principal, interest,
fees, expenses and other amounts to be made by a Credit Party under this
Agreement shall be received not later than 2:00 p.m. on the date when due, in
Dollars or the applicable Foreign Currency and in same day funds, by the
Administrative Agent at its offices in Charlotte, North Carolina. Payments
received after such time shall be deemed to have been received on the next
Business Day. The Borrower shall, at the time it makes any payment under this
Agreement, specify to the Administrative Agent, the Loans, Letters of Credit,
fees or other amounts payable by the Borrower hereunder to which such payment is
to be applied (and in the event that it fails to specify, or if such application
would be inconsistent with the terms hereof, the Administrative Agent shall,
subject to Section 3.7, distribute such payment to the Lenders in such manner as
the Administrative Agent may deem appropriate). The Administrative Agent will
distribute such payments to the applicable Lenders if any such payment is
received prior to 2:00 p.m.; otherwise the Administrative Agent will distribute
such payment to the applicable Lenders on the next succeeding Business Day.
Whenever any payment hereunder shall be stated to be due on a day which is not a
Business Day, the due date thereof shall be extended to the next succeeding
Business Day (subject to accrual of interest and fees for the period of such
extension), except that in the case of Eurocurrency Loans, if the extension
would cause the payment to be made in the next following calendar month, then
such payment shall instead be made on the next preceding Business Day.

         3.3      Prepayments.

                  (a) Voluntary Prepayments. The Borrower shall have the right
         to prepay Loans in whole or in part from time to time without premium
         or penalty; provided, however, that (i) Eurocurrency Loans may only be
         prepaid on three Business Days' prior written notice to the
         Administrative Agent and any prepayment of Eurocurrency Loans will be
         subject to Section 3.14; (ii) each such partial prepayment of Loans
         shall be in the minimum principal amount of (A) $5,000,000 for
         Revolving Loans, (B) $1,000,000 for Competitive Bid Loans and (C)
         $100,000 for Swing Line Loans, or in the case of Foreign Currency the
         U.S. Dollar Equivalent; and (iii) Competitive Bid Loans and Quoted Rate
         Swing Line Loans may not be prepaid unless a breakage fee equal to the
         amount of actual damages suffered by the Lender whose Competitive Bid
         Loan or Quoted Rate Swing Line Loan is prepaid is paid to such Lender;
         provided that such Lender shall provide the Borrower with the
         calculation of such


                                       36

<PAGE>



         damages. Amounts prepaid hereunder shall be applied as the Borrower may
         elect; provided, that if the Borrower fails to specify a voluntary
         prepayment then such prepayment shall be applied first to Revolving
         Loans that are Base Rate Loans, then to Eurocurrency Loans in direct
         order of Interest Period maturities, then to Swing Line Loans (first to
         those accruing interest at the Base Rate and then at the Quoted Rate)
         and then to Competitive Bid Loans pro rata among all Lenders holding
         same.

                  (b) Mandatory Prepayments. If at any time (i) the sum of
         Revolving Loans outstanding plus Swing Line Loans outstanding plus
         Competitive Bid Loans outstanding plus the aggregate amount of LOC
         Obligations outstanding exceeds the Revolving Committed Amount, (ii)
         the amount of Swing Line Loans outstanding exceeds the Swing Line
         Committed Amount, (iii) the amount of LOC Obligations outstanding
         exceeds the LOC Committed Amount, or (iv) the amount of Revolving Loans
         outstanding in Foreign Currency plus Competitive Bid Loans outstanding
         in Foreign Currency exceeds the U.S. Dollar Equivalent of Fifty Million
         Dollars ($50,000,000), the Borrower shall immediately make a principal
         payment to the Administrative Agent in the manner and in an amount
         necessary to be in compliance with Section 2.1, 2.2, 2.3 or 2.4, as
         applicable.

                  (c) Application of Prepayments. All amounts required to be
         paid pursuant to Section 3.3(b) (i) shall be applied first to Revolving
         Loans (first to Base Rate Loans and then to Eurocurrency Loans in
         direct order of Interest Period maturities), second to Swing Line Loans
         (first to Base Rate Loans and then to Quoted Rate Swing Line Loans),
         third to a cash collateral account in respect of LOC Obligations and
         fourth to Competitive Bid Loans pro rata among the Lenders holding
         same. All prepayments hereunder shall be subject to Section 3.14 as
         well as any breakage fees in connection with a prepayment of a
         Competitive Bid Loan or a Quoted Rate Swing Line Loan.

         3.4      Fees.

                  (a) Facility Fees. In consideration of the Revolving Committed
         Amount being made available by the Lenders hereunder, the Borrower
         agrees to pay to the Administrative Agent, for the pro rata benefit of
         each applicable Lender (based on each Lender's Revolving Loan
         Commitment Percentage of the Revolving Committed Amount), a fee equal
         to the Applicable Percentage for Facility Fees on the Revolving
         Committed Amount (the "Facility Fees"). The accrued Facility Fees shall
         commence to accrue on the Effective Date and shall be due and payable
         in arrears on the first Business Day of each fiscal quarter of the
         Borrower (as well as on the Revolving Loan Maturity Date and on any
         date that the Revolving Committed Amount is reduced) for the
         immediately preceding fiscal quarter (or portion thereof), beginning
         with the first of such dates to occur after the Closing Date.

                  (b)      Letter of Credit Fees.

                  (i) Letter of Credit Fee. In consideration of the issuance of
         Letters of Credit hereunder, the Borrower agrees to pay to the Issuing
         Lender, for the pro rata benefit of the applicable Lenders (based on
         each Lender's Revolving Loan Commitment Percentage of the Revolving
         Committed Amount), a fee (the "Letter of


                                       37

<PAGE>



                  Credit Fee") equal to the Applicable Percentage for the Letter
                  of Credit Fee on the average daily maximum amount available to
                  be drawn under each such Letter of Credit from the date of
                  issuance to the date of expiration. The Letter of Credit Fee
                  will be payable in arrears on the first Business Day of each
                  fiscal quarter of the Borrower (as well as on the Revolving
                  Loan Maturity Date) for the immediately preceding fiscal
                  quarter (or portion thereof), beginning with the first of such
                  dates to occur after the Closing Date.

                                 (ii) Issuing Lender Fees. In addition to the
                  Letter of Credit Fees payable pursuant to subsection (i)
                  above, the Borrower shall pay to the Issuing Lender for its
                  own account, without sharing by the other Lenders, (A) a fee
                  equal to one-eighth of one percent (1/8%) per annum on the
                  total sum of all Letters of Credit issued by the Issuing
                  Lender, such fee to be paid quarterly in arrears 15 days after
                  the end of each fiscal quarter of the Borrower (as well as on
                  the Revolving Loan Maturity Date) and (B) the customary
                  charges from time to time to the Issuing Lender for its
                  services in connection with the issuance, amendment, payment,
                  transfer, administration, cancellation and conversion of, and
                  drawings under, such Letters of Credit (collectively, the
                  "Issuing Lender Fees").

                  (c) Administrative Fees. The Borrower agrees to pay to the
         Administrative Agent, for its own account, an annual fee as agreed to
         between the Borrower and the Administrative Agent in the Fee Letter.

                  (d) Competitive Bid Request Fees. The Borrower agrees to pay
         to the Administrative Agent a Competitive Bid Request Fee as agreed to
         between the Borrower and the Administrative Agent as set forth in the
         Fee Letter.

         3.5 Payment in full at Maturity. On the Revolving Loan Maturity Date,
the entire outstanding principal balance of all Revolving Loans, all Swing Line
Loans, all Competitive Bid Loans and all LOC Obligations then outstanding,
together with accrued but unpaid interest and all other sums owing with respect
thereto, shall be due and payable in full, unless accelerated sooner pursuant to
Section 9.

         3.6      Computations of Interest and Fees.

                  (a) Except for Base Rate Loans, in which case interest shall
         be computed on the basis of a 365 or 366 day year, as applicable, all
         computations of interest and fees hereunder shall be made on the basis
         of the actual number of days elapsed over a year of 360 days. Interest
         shall accrue from and include the date of borrowing (or continuation or
         conversion) but exclude the date of payment.

                  (b) It is the intent of the Lenders and the Credit Parties to
         conform to and contract in strict compliance with applicable usury law
         from time to time in effect. All agreements between the Lenders and the
         Borrower are hereby limited by the provisions of this paragraph which
         shall override and control all such agreements, whether now existing or
         hereafter arising and whether written or oral. In no way, nor in any
         event or contingency (including


                                       38

<PAGE>



         but not limited to prepayment or acceleration of the maturity of any
         obligation), shall the interest taken, reserved, contracted for,
         charged, or received under this Credit Agreement, under the Notes or
         otherwise, exceed the maximum nonusurious amount permissible under
         applicable law. If, from any possible construction of any of the Credit
         Documents or any other document, interest would otherwise be payable in
         excess of the maximum nonusurious amount, any such construction shall
         be subject to the provisions of this paragraph and such documents shall
         be automatically reduced to the maximum nonusurious amount permitted
         under applicable law, without the necessity of execution of any
         amendment or new document. If any Lender shall ever receive anything of
         value which is characterized as interest on the Loans under applicable
         law and which would, apart from this provision, be in excess of the
         maximum lawful amount, an amount equal to the amount which would have
         been excessive interest shall, without penalty, be applied to the
         reduction of the principal amount owing on the Loans and not to the
         payment of interest, or refunded to the Borrower or the other payor
         thereof if and to the extent such amount which would have been
         excessive exceeds such unpaid principal amount of the Loans. The right
         to demand payment of the Loans or any other indebtedness evidenced by
         any of the Credit Documents does not include the right to receive any
         interest which has not otherwise accrued on the date of such demand,
         and the Lenders do not intend to charge or receive any unearned
         interest in the event of such demand. All interest paid or agreed to be
         paid to the Lenders with respect to the Loans shall, to the extent
         permitted by applicable law, be amortized, prorated, allocated, and
         spread throughout the full stated term (including any renewal or
         extension) of the Loans so that the amount of interest on account of
         such indebtedness does not exceed the maximum nonusurious amount
         permitted by applicable law.

                  3.7 Pro Rata Treatment. Except to the extent otherwise
         provided herein:

                  (a) Loans. Each Revolving Loan borrowing (including, without
         limitation, each Mandatory Borrowing), each payment or prepayment of
         principal of any Revolving Loan, each payment of fees (other than the
         Issuing Lender Fees retained by the Issuing Lender for its own account
         and the Administrative Fees and Competitive Bid Request Fees retained
         by the Administrative Agent for its own account), each reduction of the
         Revolving Committed Amount, and each conversion or continuation of any
         Revolving Loan, shall (except as otherwise provided in Section 3.11) be
         allocated pro rata among the relevant Lenders in accordance with the
         respective Revolving Loan Commitment Percentages of such Lenders (or,
         if the Commitments of such Lenders have expired or been terminated, in
         accordance with the respective principal amounts of the outstanding
         Revolving Loans and Participation Interests of such Lenders); provided
         that, if any Lender shall have failed to pay its applicable pro rata
         share of any Revolving Loan, then any amount to which such Lender would
         otherwise be entitled pursuant to this subsection (a) shall instead be
         payable to the Administrative Agent until the share of such Revolving
         Loan not funded by such Lender has been repaid; provided further, that
         in the event any amount paid to any Lender pursuant to this subsection
         (a) is rescinded or must otherwise be returned by the Administrative
         Agent, each Lender shall, upon the request of the Administrative Agent,
         repay to the Administrative Agent the amount so paid to such Lender,
         with interest for the period commencing on the date such payment is
         returned by the Administrative Agent until the date the Administrative
         Agent receives such repayment at a rate per annum equal to, during the
         period to but


                                       39

<PAGE>



         excluding the date two Business Days after such request, the Federal
         Funds Rate, and thereafter, the Base Rate plus two percent (2%) per
         annum; and

                  (b) Letters of Credit. Each payment of unreimbursed drawings
         in respect of LOC Obligations shall be allocated to each LOC
         Participant pro rata in accordance with its Revolving Loan Commitment
         Percentage; provided that, if any LOC Participant shall have failed to
         pay its applicable pro rata share of any drawing under any Letter of
         Credit, then any amount to which such LOC Participant would otherwise
         be entitled pursuant to this subsection (b) shall instead be payable to
         the Issuing Lender until the share of such unreimbursed drawing not
         funded by such Lender has been repaid; provided further, that in the
         event any amount paid to any LOC Participant pursuant to this
         subsection (b) is rescinded or must otherwise be returned by the
         Issuing Lender, each LOC Participant shall, upon the request of the
         Issuing Lender, repay to the Administrative Agent for the account of
         the Issuing Lender the amount so paid to such LOC Participant, with
         interest for the period commencing on the date such payment is returned
         by the Issuing Lender until the date the Issuing Lender receives such
         repayment at a rate per annum equal to, during the period to but
         excluding the date two Business Days after such request, the Federal
         Funds Rate, and thereafter, the Base Rate plus two percent (2%) per
         annum.

         3.8 Sharing of Payments. The Lenders agree among themselves that,
except to the extent otherwise provided herein, in the event that any Lender
shall obtain payment in respect of any Loan, unreimbursed drawing with respect
to any LOC Obligations or any other obligation owing to such Lender under this
Credit Agreement through the exercise of a right of setoff, banker's lien or
counterclaim, or pursuant to a secured claim under Section 506 of the Bankruptcy
Code or other security or interest arising from, or in lieu of, such secured
claim, received by such Lender under any applicable bankruptcy, insolvency or
other similar law or otherwise, or by any other means, in excess of its pro rata
share of such payment as provided for in this Credit Agreement, such Lender
shall promptly pay in cash or purchase from the other Lenders a participation in
such Loans, LOC Obligations, and other obligations in such amounts, and make
such other adjustments from time to time, as shall be equitable to the end that
all Lenders share such payment in accordance with their respective ratable
shares as provided for in this Credit Agreement. The Lenders further agree among
themselves that if payment to a Lender obtained by such Lender through the
exercise of a right of setoff, banker's lien, counterclaim or other event as
aforesaid shall be rescinded or must otherwise be restored, each Lender which
shall have shared the benefit of such payment shall, by payment in cash or a
repurchase of a participation theretofore sold, return its share of that benefit
(together with its share of any accrued interest payable with respect thereto)
to each Lender whose payment shall have been rescinded or otherwise restored.
The Borrower agrees that any Lender so purchasing such a participation may, to
the fullest extent permitted by law, exercise all rights of payment, including
setoff, banker's lien or counterclaim, with respect to such participation as
fully as if such Lender were a holder of such Loan, LOC Obligation or other
obligation in the amount of such participation. Except as otherwise expressly
provided in this Credit Agreement, if any Lender or an Agent shall fail to remit
to an Agent or any other Lender an amount payable by such Lender or such Agent
to such Agent or such other Lender pursuant to this Credit Agreement on the date
when such amount is due, such payments shall be made together with interest
thereon for each date from the date such amount is due until the date such
amount is paid to such Agent or such other Lender at a rate per annum equal to
the Federal Funds Rate. If under any applicable bankruptcy, insolvency or other


                                       40

<PAGE>



similar law, any Lender receives a secured claim in lieu of a setoff to which
this Section 3.8 applies, such Lender shall, to the extent practicable, exercise
its rights in respect of such secured claim in a manner consistent with the
rights of the Lenders under this Section 3.8 to share in the benefits of any
recovery on such secured claim.

         3.9 Capital Adequacy. If, after the date hereof, any Lender has
determined that the adoption or the becoming effective of, or any change in, or
any change by any Governmental Authority, central bank or comparable agency
charged with the interpretation or administration thereof in the interpretation
or administration of, any applicable law, rule or regulation regarding capital
adequacy, or compliance by such Lender, or its parent corporation, with any
request or directive regarding capital adequacy (whether or not having the force
of law) of any such authority, central bank or comparable agency, has or would
have the effect of reducing the rate of return on such Lender's (or parent
corporation's) capital or assets as a consequence of its commitments or
obligations hereunder to a level below that which such Lender, or its parent
corporation, could have achieved but for such adoption, effectiveness, change or
compliance (taking into consideration such Lender's (or parent corporation's)
policies with respect to capital adequacy), then, within 30 days following
written notice from such Lender to the Borrower (such notice setting forth the
amount necessary to compensate such Lender and identifying in reasonable detail
the basis for the calculation of such amount and taking into account applicable
deductions and credits in respect of the amount indemnified), the Borrower shall
be obligated to pay to such Lender such additional amount or amounts as will
compensate such Lender on an after-tax basis (after taking into account
applicable deductions and credits in respect of the amount indemnified) for such
reduction. Each determination by any such Lender of amounts owing under this
Section shall, absent manifest error, be conclusive and binding on the parties
hereto. This covenant shall survive the termination of this Credit Agreement and
the payment of the Loans and all other amounts payable hereunder. Each Lender
agrees not to give any such notice or demand any such payment with respect to
any such determinations at a time more than six months after the period as to
which the Lender has made such determinations. The Borrower shall not be
obligated to compensate any Lender for any such reductions if the Borrower shall
have received such demand from such Lender later than the time provided in the
preceding sentence. Each Lender agrees to make all reasonable efforts to avoid
or minimize the amount of any demand for payment under this Section 3.9,
including exercising all reasonable efforts to change its lending office or to
transfer its affected Loans to an Affiliate; provided, however, that no Lender
shall be required by this sentence to effect any change or transfer which would
have a materially adverse effect on such Lender's results of operations or
financial condition. Notwithstanding the foregoing, no Lender shall be entitled
to request compensation under this Section 3.9 with respect to any Eurocurrency
Competitive Loan if said Lender shall have been aware of the charge giving rise
to such request at the time of submission of the related Eurocurrency
Competitive Loan.


         3.10 Inability To Determine Eurocurrency Rate or Make Loans in Foreign
Currency. If the Administrative Agent shall have determined in good faith (which
determination shall be conclusive and binding upon the Borrower) that, (a) by
reason of circumstances affecting the relevant market, adequate and reasonable
means do not exist for ascertaining the Eurocurrency Rate or (b) Loans cannot be
made in a Foreign Currency, the Administrative Agent shall give telecopy or
telephonic notice thereof to the Borrower and the Lenders as soon as practicable
thereafter, and


                                       41

<PAGE>



will also give prompt written notice to the Borrower when such conditions no
longer exist. If such notice is given in connection with (a) above (i) any
Eurocurrency Loans requested to be made on the first day of such Interest Period
shall be made as Base Rate Loans, (ii) any Loans that were to have been
converted on the first day of such Interest Period to or continued as
Eurocurrency Loans shall be converted to or continued as Base Rate Loans and
(iii) any outstanding Eurocurrency Loans shall be converted, on the first day of
such Interest Period, to Base Rate Loans. Until such notice has been withdrawn
by the Administrative Agent, no further Eurocurrency Loans shall be made or
continued as such, nor shall the Borrower have the right to convert Base Rate
Loans to Eurocurrency Loans. If such notice is given in connection with (b)
above, any request for a Loan in such Foreign Currency shall be a request for
such loan to be made in Dollars.

         3.11 Illegality. Notwithstanding any other provision herein, if the
adoption of or any change in any Requirement of Law or in the interpretation or
application thereof occurring after the Closing Date shall make it unlawful for
any Lender to make or maintain Eurocurrency Loans as contemplated by this Credit
Agreement, (a) such Lender shall promptly give written notice of such
circumstances to the Borrower and the Administrative Agent (which notice shall
be withdrawn whenever such circumstances no longer exist), (b) the commitment of
such Lender hereunder to make Eurocurrency Loans, continue Eurocurrency Loans as
such and convert a Base Rate Loan to Eurocurrency Loans shall forthwith be
canceled and, until such time as it shall no longer be unlawful for such Lender
to make or maintain Eurocurrency Loans, such Lender shall then have a commitment
only to make a Base Rate Loan when a Eurocurrency Loan is requested and (c) such
Lender's Loans then outstanding as Eurocurrency Loans, if any, shall be
converted automatically to Base Rate Loans on the respective last days or the
then current Interest Periods with respect to such Loans or within such earlier
period as required by law. If any such conversion of a Eurocurrency Loan occurs
on a day which is not the last day of the then current Interest Period with
respect thereto, the Borrower shall pay to such Lender such amounts, if any, as
may be required pursuant to Section 3.14.

         3.12 Requirements of Law. If, after the Closing Date, the adoption of
or any change in any Requirement of Law or in the interpretation or application
thereof applicable to any Lender, or compliance by any Lender with any request
or directive (whether or not having the force of law) from any central bank or
other Governmental Authority, in each case made subsequent to the Closing Date
(or, if later, the date on which such Lender becomes a Lender):

                  (a) shall change the basis of taxation of payments to such
         Lender of the principal of or interest on any Loan made by such Lender
         or any fees or other amounts payable to such Lender hereunder (except
         for Non-Excluded Taxes covered by Section 3.13 (including Non- Excluded
         Taxes imposed solely by reason of any failure of such Lender to comply
         with its obligations under Section 3.13(b)) and changes in taxes
         measured by or imposed upon the overall net income, or franchise tax,
         gross receipt taxes, branch taxes, taxes on doing business or taxes on
         the overall net worth of such Lender or its applicable lending office,
         branch, or any affiliate thereof);

                  (b) shall impose, modify or hold applicable any reserve,
         special deposit, compulsory loan or similar requirement against assets
         held by, deposits or other liabilities in or for the account of,
         advances, loans or other extensions of credit by, or any other


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<PAGE>



         acquisition of funds by, any office of such Lender which is not
         otherwise included in the determination of the Eurocurrency Rate
         hereunder; or

                  (c) shall impose on such Lender any other condition (excluding
         any tax of any kind whatsoever);

and the result of any of the foregoing is to increase the cost to such Lender,
by an amount which such Lender reasonably deems to be material, of making,
converting into, continuing or maintaining Eurocurrency Loans or issuing or
participating in Letters of Credit or making Loans in a Foreign Currency or to
reduce any amount receivable hereunder in respect thereof, then, in any such
case, upon notice to the Borrower from such Lender, through the Administrative
Agent, in accordance herewith, the Borrower shall be obligated to promptly pay
such Lender, upon its demand, any additional amounts necessary to compensate
such Lender on an after-tax basis (after taking into account applicable
deductions and credits in respect of the amount indemnified) for such increased
cost or reduced amount receivable, provided that, in any such case, the Borrower
may elect to convert the Eurocurrency Loans made by such Lender hereunder to
Base Rate Loans by giving the Administrative Agent at least one Business Day's
notice of such election, in which case the Borrower shall promptly pay to such
Lender, upon demand, without duplication, such amounts, if any, as may be
required pursuant to Section 3.14. If any Lender becomes entitled to claim any
additional amounts pursuant to this Section 3.12, it shall provide prompt notice
thereof to the Borrower, through the Administrative Agent, certifying (x) that
one of the events described in this Section 3.12 has occurred and describing in
reasonable detail the nature of such event, (y) as to the increased cost or
reduced amount resulting from such event and (z) as to the additional amount
demanded by such Lender and a reasonably detailed explanation of the calculation
thereof. Such a certificate as to any additional amounts payable pursuant to
this Section 3.12 submitted by such Lender, through the Administrative Agent, to
the Borrower shall be conclusive and binding on the parties hereto in the
absence of manifest error. This covenant shall survive the termination of this
Credit Agreement and the payment of the Loans and all other amounts payable
hereunder. Notwithstanding the foregoing, no Lender shall be entitled to request
compensation under this Section 3.12 with respect to any Eurocurrency
Competitive Loan if said Lender shall have been aware of the charge giving rise
to such request at the time of submission of the related Eurocurrency
Competitive Loan.

         3.13     Taxes.

                  (a) Except as provided below in this Section 3.13, all
         payments made by the Borrower under this Credit Agreement and any Notes
         shall be made free and clear of, and without deduction or withholding
         for or on account of, any present or future income, stamp or other
         taxes, levies, imposts, duties, charges, fees, deductions or
         withholdings, now or hereafter imposed, levied, collected, withheld or
         assessed by any court, or governmental body, agency or other official,
         excluding taxes measured by or imposed upon the overall net income of
         any Lender or its applicable lending office, or any branch or affiliate
         thereof, and all franchise taxes, gross receipts, branch taxes, taxes
         on doing business or taxes on the overall capital or net worth of any
         Lender or its applicable lending office, or any branch or affiliate
         thereof, in each case imposed: (i) by the jurisdiction under the laws
         of which such Lender, applicable lending office, branch or affiliate is
         organized or is located, or in which its principal executive or
         business office is located, or any nation within which such


                                       43

<PAGE>



         jurisdiction is located or any political subdivision thereof; or (ii)
         by reason of any connection between the jurisdiction imposing such tax
         and such Lender, applicable lending office, principal executive or
         business office branch or affiliate other than a connection arising
         solely from such Lender having executed, delivered or performed its
         obligations, or received payment under or enforced, this Credit
         Agreement or any Notes. If any such non-excluded taxes, levies,
         imposts, duties, charges, fees, deductions or withholdings
         ("Non-Excluded Taxes") are required to be withheld from any amounts
         payable to an Agent or any Lender hereunder or under any Notes, (A) the
         amounts so payable to an Agent or such Lender shall be increased to the
         extent necessary to yield to an Agent or such Lender (after payment of
         all Non-Excluded Taxes) interest or any such other amounts payable
         hereunder at the rates or in the amounts specified in this Credit
         Agreement and any Notes, provided, however, that the Borrower shall be
         entitled to deduct and withhold any Non-Excluded Taxes (and other
         applicable taxes) and shall not be required to increase any such
         amounts payable to any Lender that is not organized under the laws of
         the United States of America or a state thereof if such Lender fails to
         comply with the requirements of paragraph (b) (or (h)) of this Section
         3.13 whenever any Non-Excluded Taxes (or other applicable taxes) are
         payable by or otherwise imposed on or collected from the Borrower, and
         (B) as promptly as possible after requested the Borrower shall send to
         such Agent for its own account or for the account of such Lender, as
         the case may be, a certified copy of an original official receipt
         received by the Borrower or, if none is available, other written
         evidence showing payment thereof. If the Borrower fails to pay any
         Non-Excluded Taxes when due to the appropriate taxing authority or
         fails to remit to the Administrative Agent the required receipts or
         other required documentary evidence, the Borrower shall indemnify the
         Agents and any Lender for any incremental taxes, interest or penalties
         that may become payable by an Agent or any Lender as a result of any
         such failure. The agreements in this subsection shall survive the
         termination of this Credit Agreement and the payment of the Loans and
         all other amounts payable hereunder.

                  (b) Each Person which is a Lender that is not incorporated
         under the laws of the United States of America or any state or
         jurisdiction thereof shall:

                            (i) (A) on or before the date on which such Person
                  becomes a Lender hereunder, deliver to the Borrower and the
                  Administrative Agent (x) two duly completed copies of United
                  States Internal Revenue Service Form 1001 or 4224, or
                  successor applicable form, as the case may be, certifying that
                  it is entitled to receive payments under this Credit Agreement
                  and any Notes without deduction or withholding of any United
                  States federal income taxes and (y) an Internal Revenue
                  Service Form W-8 or W-9, or successor applicable form, as the
                  case may be, certifying that it is entitled to an exemption
                  from United States backup withholding tax;

                                    (B) deliver to the Borrower and the
                  Administrative Agent two further copies of any such form or
                  certification on or before the date that any such form or
                  certification expires or becomes obsolete and after the
                  occurrence of any event requiring a change in the most recent
                  form previously delivered by it to the Borrower; and


                                       44

<PAGE>



                                    (C) obtain such extensions of time for
                  filing and complete such forms or certifications as may
                  reasonably be requested by the Borrower or the Administrative
                  Agent; or

                                 (ii) in the case of any such Person that is not
                  a "bank" within the meaning of Section 881(c)(3)(A) of the
                  Internal Revenue Code, on or before the date such Person
                  becomes a Lender hereunder, (A) represent in writing to the
                  Borrower (for the benefit of the Borrower and the Agents) that
                  it is not a bank within the meaning of Section 881(c)(3)(A) of
                  the Internal Revenue Code, (B) deliver to the Borrower, with a
                  copy to the Administrative Agent, two accurate and complete
                  original signed copies of Internal Revenue Service Form W-8,
                  or successor applicable form certifying to such Lender's legal
                  entitlement at the date of such certificate to an exemption
                  from U.S. withholding tax under the provisions of Section
                  881(c) of the Internal Revenue Code with respect to payments
                  to be made under this Credit Agreement and any Notes (and to
                  deliver to the Borrower and the Administrative Agent two
                  further copies of such form on or before the date it expires
                  or becomes obsolete and after the occurrence of any event
                  requiring a change in the most recently provided form and, if
                  necessary, obtain any extensions of time reasonably requested
                  by the Borrower or the Administrative Agent for filing and
                  completing such forms), and (C) agree, to the extent legally
                  entitled to do so, upon reasonable request by the Borrower, to
                  provide to the Borrower (for the benefit of the Borrower and
                  the Agents) such other forms as may be reasonably required in
                  order to establish the legal entitlement of such Lender to an
                  exemption from withholding with respect to payments under this
                  Credit Agreement and any Notes.

         Notwithstanding the above, if any change in treaty, law or regulation
         has occurred after the date such Person becomes a Lender hereunder
         which renders all such forms inapplicable or which would prevent such
         Lender from duly completing and delivering any such form or reasonable
         substitution therefor with respect to it and such Lender so advises the
         Borrower and the Administrative Agent then such Lender shall be exempt
         from such requirements. Each Person that shall become a Lender or a
         participant of a Lender pursuant to Section 11.3 shall, upon the
         effectiveness of the related transfer, be required to provide all of
         the forms, certifications and statements required pursuant to this
         subsection (b); provided that in the case of a participant of a Lender,
         the obligations of such participant of a Lender pursuant to this
         subsection (b) shall be determined as if the participant of a Lender
         were a Lender except that such participant of a Lender shall furnish
         all such required forms, certifications and statements to the Lender
         from which the related participation shall have been purchased and such
         Lender shall provide copies to the Administrative Agent and the
         Borrower.

                  (c) Notwithstanding anything to the contrary in this Credit
         Agreement, the Borrower shall not be required to pay any current or
         future stamp, intangible or documentary taxes or any other excise or
         property taxes, charges or similar levies (including without
         limitation, mortgage recording taxes and similar fees) that arise as a
         result of sales, assignments or other transfers of rights hereunder by
         any Lender.



                                       45

<PAGE>



                  (d) If requested by a Borrower, and at the Borrower's expense,
         any Lender and the Administrative Agent shall take such steps as may be
         appropriate to seek a refund of any Non-Excluded Taxes paid by it and
         shall permit the Borrower to participate in the preparation of any such
         refund claim. If any Lender or the Administrative Agent receives a
         refund in respect of any Non-Excluded Taxes for which the Lender has
         received payment from the Borrower hereunder, any Lender and the
         Administrative Agent, within 15 days of such receipt, shall deliver to
         the Borrower the amount of such refund. In addition, within 15 days of
         a written request of a Borrower, any Lender and the Administrative
         Agent shall execute and deliver to the Borrower such certificates,
         forms or other documents which can be reasonably furnished consistent
         with the facts and which are reasonably necessary to assist the
         Borrower in applying for refunds of Non-Excluded Taxes remitted
         hereunder.

                  (e) If a Borrower is required to pay any amounts pursuant to
         the provisions of this Section 3.13, and if thereafter any Lender or
         the Administrative Agent shall receive or be granted a credit against
         or remission or other relief for any Non-Excluded Taxes payable by the
         Borrower solely in respect of the amounts so paid by the Borrower, such
         Lender shall to the extent that it can do so without prejudice to the
         retention of the amount of such credit, remission or other relief, pay
         to the Borrower promptly after the date on which any Lender or the
         Administrative Agent effectively obtains the benefit of such credit,
         remission or other relief an amount which such Lender reasonably
         determines to be equal to such credit, remission or other relief less
         any sum which the Lender is required by law to deduct therefrom. The
         Lender may, in its reasonable discretion, determine the order of
         utilization of all charges, deductions, credits and expenses.

                  (f) In the event any Lender or the Administrative Agent
         receives written communication from any tax authority with respect to
         an assessment or proposed assessment of any Non-Excluded Taxes, such
         Lender or the Administrative Agent shall promptly notify the Borrower
         in writing and provide a copy of such communication to the Borrower.

                  (g) Each Lender shall use reasonable efforts to avoid or
         minimize any amounts which might otherwise be payable pursuant to this
         Section 3.13, including, upon request of a Borrower, the change of its
         lending office; provided, however, that such efforts shall not include
         the taking of any actions by the Lender that would result in any tax,
         costs or other expense to the Lender (other than a tax, cost or expense
         for which the Lender shall have been reimbursed or indemnified by the
         Borrower pursuant to this Credit Agreement or otherwise) or any action
         which would have a materially adverse effect on such Lenders results of
         operations or financial condition.

                  (h) Each Person which is a Lender that is incorporated under
         the laws of the United States of America or a state thereof shall, on
         or before the date such Person becomes a Lender hereunder, deliver to
         the Borrower and the Administrative Agent an Internal Revenue Service
         Form W-9, or successor applicable form, certifying that it is entitled
         to an exemption from United States backup withholding tax.

                  3.14 Compensation. The Borrower promises to indemnify each
         Lender and to hold each Lender harmless from any loss or expense which
         such Lender may sustain or incur as a consequence


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<PAGE>



of (a) default by the Borrower in making a borrowing of, conversion into or
continuation of Eurocurrency Loans after the Borrower has given a notice
requesting the same in accordance with the provisions of this Credit Agreement,
(b) default by the Borrower in making any prepayment of a Eurocurrency Loan
after the Borrower has given a notice thereof in accordance with the provisions
of this Credit Agreement and (c) the making of a prepayment of Eurocurrency
Loans on a day which is not the last day of an Interest Period with respect
thereto. Such indemnification may include an amount equal to (i) the amount of
interest which would have accrued on the amount so prepaid, or not so borrowed,
converted or continued, for the period from the date of such prepayment or of
such failure to borrow, convert or continue to the last day of the applicable
Interest Period (or, in the case of a failure to borrow, convert or continue,
the Interest Period that would have commenced on the date of such failure) in
each case at the applicable rate of interest for such Eurocurrency Loans
provided for herein (excluding, however, the Applicable Percentage included
therein, if any) minus (ii) the amount of interest (as reasonably determined by
such Lender) which would have accrued to such Lender on such amount by placing
such amount on deposit for a comparable period with leading banks in the
interbank Eurocurrency market. The agreements in this Section shall survive the
termination of this Credit Agreement and the payment of the Loans and all other
amounts payable hereunder.


                                    SECTION 4

                                    GUARANTY

         4.1 Guaranty of Payment. Subject to Section 4.7 below, each of the
Guarantors hereby, jointly and severally, unconditionally guarantees to each
Lender and the Agents the prompt payment of the Borrower Obligations in full
when due (whether at stated maturity, as a mandatory prepayment, by acceleration
or otherwise). This Guaranty is a guaranty of payment and not of collection and
is a continuing guaranty and shall apply to all Borrower Obligations whenever
arising.

         4.2 Obligations Unconditional. The obligations of the Guarantors
hereunder are absolute and unconditional, irrespective of the value,
genuineness, validity, regularity or enforceability of any of the Credit
Documents or any other agreement or instrument referred to therein, to the
fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever which might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor. Each Guarantor agrees that this
Guaranty may be enforced by the Lenders without the necessity at any time of
resorting to or exhausting any other security or collateral and without the
necessity at any time of having recourse to the Notes or any other of the Credit
Documents or any collateral, if any, hereafter securing the Borrower Obligations
or otherwise and each Guarantor hereby waives the right to require the Lenders
to proceed against the Borrower or any other Person (including a co-guarantor)
or to require the Lenders to pursue any other remedy or enforce any other right.
Each Guarantor further agrees that any right of subrogation, indemnity,
reimbursement or contribution it may have against the Borrower or any other
Guarantor of the Borrower Obligations for amounts paid under this Guaranty shall
be subordinated to (and no Guarantor shall assert same unless and until) the
repayment in full of all Loans, all reimbursement obligations under Letters of
Credit, all interest thereon, and all fees until 100 days after the date on
which all Commitments and Letters of Credit have been terminated and all Loans,
LOC Obligations, interest, and fees have been paid in full. Each


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<PAGE>



Guarantor further agrees that nothing contained herein shall prevent the Lenders
from suing on the Notes or any of the other Credit Documents or foreclosing its
security interest in or Lien on any collateral, if any, securing the Borrower
Obligations or from exercising any other rights available to it under this
Credit Agreement, the Notes, any other of the Credit Documents, or any other
instrument of security, if any, and the exercise of any of the aforesaid rights
and the completion of any foreclosure proceedings shall not constitute a
discharge of any Guarantor's obligations hereunder; it being the purpose and
intent of each Guarantor that its obligations hereunder shall be absolute,
independent and unconditional under any and all circumstances. Neither any
Guarantor's obligations under this Guaranty nor any remedy for the enforcement
thereof shall be impaired, modified, changed or released in any manner
whatsoever by an impairment, modification, change, release or limitation of the
liability of the Borrower or by reason of the bankruptcy or insolvency of the
Borrower. Each Guarantor waives any and all notice of the creation, renewal,
extension or accrual of any of the Borrower Obligations and notice of or proof
of reliance of by any Agent or any Lender upon this Guarantee or acceptance of
this Guarantee. The Borrower Obligations, and any of them, shall conclusively be
deemed to have been created, contracted or incurred, or renewed, extended,
amended or waived, in reliance upon this Guarantee. All dealings between the
Borrower and any of the Guarantors, on the one hand, and the Agents and the
Lenders, on the other hand, likewise shall be conclusively presumed to have been
had or consummated in reliance upon this Guarantee.

         4.3 Modifications. Each Guarantor agrees that (a) all or any part of
the security now or hereafter held for the Borrower Obligations, if any, may be
exchanged, compromised or surrendered from time to time; (b) the Lenders shall
not have any obligation to protect, perfect, secure or insure any such security
interests, liens or encumbrances now or hereafter held, if any, for the Borrower
Obligations or the properties subject thereto; (c) the time or place of payment
of the Borrower Obligations may be changed or extended, in whole or in part, to
a time certain or otherwise, and may be renewed or accelerated, in whole or in
part; (d) the Borrower and any other party liable for payment under the Credit
Documents may be granted indulgences generally or be released; (e) any of the
provisions of the Notes or any of the other Credit Documents may be modified,
amended or waived in accordance with Section 11.6; and (f) any deposit balance
for the credit of the Borrower or any other party liable for the payment of the
Borrower Obligations or liable upon any security therefor may be released, in
whole or in part, at, before or after the stated, extended or accelerated
maturity of the Borrower Obligations, all without notice to or further assent by
such Guarantor, which shall remain bound thereon, notwithstanding any such
exchange, compromise, surrender, extension, renewal, acceleration, modification,
indulgence or release.

         4.4 Waiver of Rights. Each Guarantor expressly waives to the fullest
extent permitted by applicable law: (a) notice of acceptance of this Guaranty by
the Lenders and of all extensions of credit to the Borrower by the Lenders; (b)
presentment and demand for payment or performance of any of the Borrower
Obligations; (c) protest and notice of dishonor or of default (except as
specifically required in the Credit Agreement) with respect to the Borrower
Obligations or with respect to any security therefor; (d) notice of the Lenders
obtaining, amending, substituting for, releasing, waiving or modifying any
security interest, lien or encumbrance, if any, hereafter securing the Borrower
Obligations, or the Lenders' subordinating, compromising, discharging or
releasing such security interests, liens or encumbrances, if any; (e) all other
notices to which such Guarantor might otherwise be entitled; and (f) demand for
payment under this Guaranty.


                                       48

<PAGE>



         4.5 Reinstatement. The obligations of the Guarantors under this Section
4 shall be automatically reinstated if and to the extent that, on or before 100
days following the date on which all Commitments and Letters of Credit have been
terminated, and all Loans, LOC Obligations, interest and fees have been paid,
for any reason any payment by or on behalf of any Person in respect of the
Credit Party Obligations is rescinded or must be otherwise restored by any
holder of any of the Credit Party Obligations, whether as a result of any
proceedings in bankruptcy or reorganization or otherwise, and each Guarantor
agrees that it will indemnify the Agents and each Lender on demand for all
reasonable costs and expenses (including, without limitation, reasonable fees of
counsel) incurred by an Agent or such Lender in connection with such rescission
or restoration, including any such costs and expenses incurred in defending
against any claim alleging that such payment constituted a preference,
fraudulent transfer or similar payment under any bankruptcy, insolvency or
similar law.

         4.6 Remedies. The Guarantors agree that, as between the Guarantors, on
the one hand, and the Agents and the Lenders, on the other hand, the Credit
Party Obligations may be declared to be forthwith due and payable as provided in
Section 9 (and shall be deemed to have become automatically due and payable in
the circumstances provided in Section 9) notwithstanding any stay, injunction or
other prohibition preventing such declaration (or preventing such Credit Party
Obligations from becoming automatically due and payable) as against any other
Person (including any other Guarantor) and that, in the event of such
declaration (or such Credit Party Obligations being deemed to have become
automatically due and payable), such Credit Party Obligations (whether or not
due and payable by any other Person) shall forthwith become due and payable by
the Guarantors.

         4.7      Limitation of Guaranty.

                  (a) Each Guarantor and by its acceptance of hereof, the Agents
         and each other Lender, hereby confirms that it is the intention of all
         such parties that this Section 4 not constitute a fraudulent transfer
         or conveyance for purposes of the Bankruptcy Code, the Uniform
         Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any
         similar federal or state law to the extent applicable to this Section
         4. To effectuate the foregoing intention, the Agents, the other Lenders
         and the Guarantors hereby irrevocably agree that the obligations of
         each Guarantor and such Guarantor's Subsidiaries under this Section 4
         and, without duplication, under any Collateral Document and any other
         Credit Document to which such Guarantor is a party, shall not, in the
         aggregate, exceed the greater of (i) the net benefit realized by such
         Guarantor or any such Subsidiary from the proceeds of the Loans made
         from time to time by the Borrower to the Guarantor or any Subsidiary of
         the Guarantor and (ii) 95% of the Adjusted Net Assets of such Guarantor
         from time to time following the Closing Date (or, if such Guarantor has
         executed and delivered a Joinder Agreement, the date of execution of
         such Joinder Agreement). "Adjusted Net Assets" of any Guarantor with
         respect to any payment by such Guarantor at any date means the lesser
         of (x) the amount by which the fair value of the property of the
         Guarantor at such date (including, without limitation, goodwill and the
         rights and property of such Guarantor incurred pursuant to Section 4.8
         in conjunction with prior payments under this Section 4) exceeds the
         total amount of liabilities (including, without limitation, contingent
         liabilities and, in conjunction with prior payments made under this
         Section 4, liabilities incurred by such Guarantor


                                       49

<PAGE>



         pursuant to Section 4.8, but excluding all other liabilities under this
         Section 4) of the Guarantor at such date and (y) the amount by which
         the present fair salable value of the assets of the Guarantor at such
         date (including, without limitation, goodwill and the rights and
         property of such Guarantor incurred pursuant to Section 4.8 in
         conjunction with prior payments under this Section 4) exceeds the
         amount that will be required to pay the probable liability of the
         Guarantor on its debts (including liabilities incurred by such
         Guarantor pursuant to Section 4.8 in conjunction with prior payments
         under this Section 4 but excluding all other debt in respect of this
         Section 4), as they become absolute and matured.

                  (b) Notwithstanding any provision to the contrary contained
         herein or in any of the other Credit Documents, to the extent the
         obligations of any Guarantor shall be adjudicated to be invalid or
         unenforceable for any reason (including, without limitation, because of
         any applicable state or federal law relating to fraudulent conveyances
         or transfers) then the obligations of such Guarantor hereunder shall be
         limited to the maximum amount that is permissible under applicable law
         (whether federal or state and including, without limitation, the
         Bankruptcy Code).

         4.8 Rights of Contribution. The Guarantors hereby agree, as among
themselves, that if any Guarantor shall become an Excess Funding Guarantor (as
defined below), each other Guarantor shall, on demand of such Excess Funding
Guarantor (but subject to the next sentence hereof), pay to such Excess Funding
Guarantor an amount equal to such Guarantor's Pro Rata Share (as defined below
and determined, for this purpose, without reference to the properties, assets,
liabilities and debts of such Excess Funding Guarantor) of such Excess Payment
(as defined below). The payment obligation of any Guarantor to any Excess
Funding Guarantor under this Section 4.8 shall be subordinate and subject in
right of payment to the prior payment in full of the obligations of such
Guarantor to the extent and until such time as set forth in the third sentence
of Section 4.2, and until such time such Excess Funding Guarantor shall not
exercise any right or remedy with respect to such excess. For purposes hereof,
(i) "Excess Funding Guarantor" shall mean, in respect of any obligations arising
under the other provisions of this Section 4 (hereafter, the "Guaranteed
Obligations"), a Guarantor that has made an Excess Payment; (ii) "Excess
Payment" shall mean, in respect of any Guaranteed Obligations, the amount paid
by a Guarantor in excess of the sum of (A) the lesser of its Pro Rata Share of
such Guaranteed Obligations and the maximum amount that such Guarantor is
required to pay in respect of such obligations pursuant to Section 4.7; and (B)
the aggregate amount of payments made by Borrower to such Guarantor in respect
of such Guaranteed Obligations in accordance with the third sentence of Section
4.2 and (iii) "Pro Rata Share", in respect of any determination for the purposes
of this Section 4.8, shall mean, for any Guarantor, the ratio (expressed as a
percentage) of (a) the amount by which the aggregate present fair saleable value
of all of its assets and properties exceeds the amount of all debts and
liabilities of such Guarantor (including contingent, subordinated, unmatured,
and unliquidated liabilities, but excluding the obligations of such Guarantor
hereunder) to (b) the amount by which the aggregate present fair saleable value
of all assets and other properties of the Borrower and all of the Guarantors
exceeds the amount of all of the debts and liabilities (including contingent,
subordinated, unmatured, and unliquidated liabilities, but excluding the
obligations of the Borrower and the Guarantors hereunder) of the Borrower and
all of the Guarantors, all as of the time of such determination.




                                       50

<PAGE>



                                    SECTION 5

                              CONDITIONS PRECEDENT

         5.1 Closing Conditions. The obligation of the Lenders to enter into
this Credit Agreement and make the initial Extension of Credit is subject to
satisfaction of the following conditions:

                  (a) Executed Credit Documents. Receipt by the Agents of duly
         executed copies of each of the following required to be effective on
         the Effective Date: (i) this Credit Agreement; (ii) the Notes, (iii)
         the Collateral Documents and (iv) all other Credit Documents, each in
         form and substance reasonably acceptable to the Agents in their sole
         discretion.

                  (b) Corporate and Partnership Documents. Receipt by the Agents
         of the following:

                                  (i) Charter Documents. Either (A) copies of
                  the articles or certificates of incorporation or other charter
                  documents of each Credit Party that is a corporation certified
                  to be true and complete as of a recent date by the appropriate
                  Governmental Authority of the state or other jurisdiction of
                  its incorporation and certified by a secretary or assistant
                  secretary of such Credit Party to be true and correct as of
                  the Effective Date or (B) a copy of the partnership agreement
                  of each Credit Party that is a partnership certified by its
                  general partner to be true and correct.

                                 (ii) Bylaws. A copy of the bylaws of each
                  Credit Party that is a corporation certified by a secretary or
                  assistant secretary of such Credit Party to be true and
                  correct as of the Effective Date.

                                (iii) Resolutions. Copies of resolutions of the
                  Board of Directors of each Credit Party (or its general
                  partner, as applicable) approving and adopting such Credit
                  Documents to which it is a party, the transactions
                  contemplated therein and authorizing execution and delivery
                  thereof, certified by a secretary or assistant secretary of
                  such Credit Party (or its general partner, as applicable) to
                  be true and correct and in force and effect as of the
                  Effective Date.

                                 (iv) Good Standing. Copies of (A) certificates
                  of good standing, existence or its equivalent, as applicable,
                  with respect to each Credit Party (and its general partner, as
                  applicable) certified as of a recent date by the appropriate
                  Governmental Authorities of the state or other jurisdiction of
                  incorporation and each other jurisdiction in which the failure
                  to so qualify and be in good standing would have a Material
                  Adverse Effect on the business or operations of a Credit Party
                  in such jurisdiction and (B) to the extent available, a
                  certificate indicating payment of all corporate franchise
                  taxes certified as of a recent date by the appropriate
                  governmental taxing authorities.



                                       51

<PAGE>



                                  (v) Incumbency. An incumbency certificate of
                  each Credit Party (or its general partner, as applicable)
                  certified by a secretary or assistant secretary to be true and
                  correct as of the Effective Date.

                  (c) Financial Statements. Receipt by the Agents of (i) the
         consolidated financial statements of the Credit Parties for fiscal
         years 1994 and 1995, including balance sheets and income and cash flow
         statements audited by an independent public accounting firm acceptable
         to the Agents and containing an unqualified opinion of such firm that
         such statements present fairly, in all material respects, the
         consolidated financial condition and results of operations of the
         Credit Parties, and are prepared in conformity with GAAP, and (ii) pro
         forma financial statements for the immediate succeeding five fiscal
         years.

                  (d) Opinion of Counsel. Receipt by the Agents of an opinion,
         or opinions (which shall cover, among other things, authority,
         legality, validity, binding effect and enforceability), reasonably
         satisfactory to the Agents, addressed to the Agents on behalf of the
         Lenders and dated as of the Effective Date, from legal counsel to the
         Credit Parties.

                  (e) Spin-Off. The Agents shall have received in connection
         with the spin-off of the Borrower from Corning Clinical Laboratories
         Inc., a Delaware corporation (the "Spin- Off") a copy of the IRS
         Private Letter Ruling issued to Corning Incorporated addressing the tax
         treatment of the Spin-Off.

                  (f) Consents and Approvals. The Borrower shall receive all
         governmental, shareholder and third party consents and approvals
         necessary in connection with the Spin- Off.

                  (g) Expiration of Waiting Periods. The Borrower and its
         Subsidiaries shall confirm the expiration of all applicable waiting
         periods, without any action being taken by any authority (i) in
         connection with the Spin-Off, and (ii) to the extent it would restrain,
         prevent or impose any material adverse conditions on the Borrower or
         any of its Subsidiaries.

                  (h) Due Diligence. The completion of all due diligence with
         respect to the Credit Parties and their Subsidiaries in scope and
         determination satisfactory to the Agents in their reasonable
         discretion, including, without limitation, historical financial
         information, litigation, tax, accounting, labor, insurance, pension
         liabilities (actual or contingent) real estate leases, material
         contracts, debt agreements, property ownership and contingent
         liabilities.

                  (i) Liens. The Agents shall have received evidence
         satisfactory to the Agents that no Liens are in effect except for
         Permitted Liens.

                  (j) Evidence of Insurance. Receipt by the Agents of copies of
         insurance policies or certificates of insurance of the Credit Parties
         evidencing liability and casualty insurance meeting the requirements
         set forth in the Credit Documents.



                                       52

<PAGE>



                  (k) Material Adverse Effect. There shall not have occurred a
         change since December 31, 1995 that has had or could reasonably be
         expected to have a Material Adverse Effect.

                  (l) Litigation. Except as disclosed on Schedule 6.11, there
         shall not exist any pending or threatened action, suit, investigation
         or proceeding pending or threatened in any court or before any
         arbitrator or governmental authority against a Credit Party or any of
         their Subsidiaries that would have or would reasonably be expected to
         have a Material Adverse Effect.

                  (m) Officer's Certificates. The Agents shall have received a
         certificate or certificates executed by the chief financial officer of
         the Borrower on behalf of the Borrower as of the Effective Date stating
         that (i) the Borrower and each of the Borrower's Subsidiaries are in
         compliance with all existing material financial obligations, (ii) no
         action, suit, investigation or proceeding is pending or threatened in
         any court or before any arbitrator or governmental instrumentality that
         purports to effect the Borrower, any of the Borrower's Subsidiaries or
         any transaction contemplated by the Credit Documents, if such action,
         suit, investigation or proceeding would have or would be reasonably
         expected to have a Material Adverse Effect, (iii) the financial
         statements and information delivered pursuant to Section 5.1(c) were
         prepared in good faith and using reasonable assumptions and (iv)
         immediately after giving effect to this Credit Agreement, the other
         Credit Documents and all the transactions contemplated therein to occur
         on such date, (A) each Credit Party is Solvent, (B) no Default or Event
         of Default has occurred and is continuing, (C) all representations and
         warranties contained herein and in the other Credit Documents are true
         and correct in all material respects, and (D) the Borrower is in
         compliance with each of the financial covenants set forth in Section
         7.2.

                  (n) Existing Financial Obligations. The Borrower and its
         Subsidiaries shall be in compliance with all existing financial
         obligations in all material respects.

                  (o) Disruption of Financial Markets. The absence of any
         disruption or adverse change in the financial or capital markets
         generally which the Agents, in their sole discretion, deem material in
         connection with the syndication of the credit facility evidenced by
         this Credit Agreement.

                  (p) Fees and Expenses. Payment by the Credit Parties of all
         fees and expenses owed by them to the Lenders and the Agents,
         including, without limitation, payment to the Agents of the fees set
         forth in the Fee Letter.

                  (q) Collateral. Receipt by the Administrative Agent of (i) all
         stock certificates or other instruments evidencing the Voting Stock
         pledged pursuant to a Pledge Agreement, together with duly executed in
         blank stock powers attached thereto and (ii) all promissory notes
         evidencing loans from Credit Parties to Non-Material Domestic
         Subsidiaries together with duly executed endorsements attached thereto.



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<PAGE>



                  (r) Other. Receipt by the Agents of such other documents,
         instruments, agreements or information as reasonably and timely
         requested by an Agent.

         5.2 Conditions to All Extensions of Credit. In addition to the
conditions precedent stated elsewhere herein, the Lenders shall not be obligated
to make, continue or convert Loans nor shall the Issuing Lender be required to
issue or extend a Letter of Credit unless:

                  (a) Notice. The Borrower shall have delivered (i) in the case
         of any new Revolving Loan, a Notice of Borrowing, duly executed and
         completed, by the time specified in Section 2.1, (ii) in the case of
         any Letter of Credit, the Issuing Lender shall have received an
         appropriate request for issuance in accordance with the provisions of
         Section 2.2, (iii) in the case of any Swing Line Loan, a Swing Line
         Loan Request, duly executed and completed, by the time specified in
         Section 2.4, (iv) in the case of any Competitive Bid Loans, a
         Competitive Bid Loan Request, duly executed and completed, by the time
         specified in Section 2.3 and (v) in the case of any continuation or
         conversion of an existing Loan, a Notice of Continuation/Conversion by
         the time specified in Section 2.1(e);

                  (b) Representations and Warranties. If the Borrower is
         requesting (i) a new Loan (as opposed to a continuation or conversion
         of an existing Loan) or (ii) the issuance of a Letter of Credit, the
         representations and warranties made in the Credit Documents are true
         and correct in all material respects at and as if made as of such date
         except to the extent they expressly relate to an earlier date;

                  (c) No Default. No Default or Event of Default shall exist or
         be continuing either prior to or after giving effect thereto;

                  (d) Availability. Immediately after giving effect to the
         making of a Revolving Loan (and the application of the proceeds
         thereof) or to the issuance of a Letter of Credit, as the case may be,
         the sum of the Revolving Loans outstanding plus LOC Obligations
         outstanding plus Swing Line Loans outstanding plus Competitive Bid
         Loans outstanding shall not exceed the Revolving Committed Amount.

The delivery of each Notice of Borrowing and each request for a Letter of Credit
shall constitute a representation and warranty by the Borrower of the
correctness of the matters specified in subsections (b), (c) and (d) above and
the delivery of each Notice of Continuation/Conversion shall constitute a
representation and warranty by the Borrower of the correctness of the matters
specified in subsections (c) and (d) above.




                                       54

<PAGE>



                                    SECTION 6

                         REPRESENTATIONS AND WARRANTIES

         The Credit Parties hereby represent to the Agents and each Lender that:

         6.1 Financial Condition. The financial statements delivered to the
Lenders pursuant to Section 5.1(c)(i) and Section 7.1(a) and (b): (a) have been
prepared in accordance with GAAP and (b) present fairly the consolidated
financial condition, results of operations and cash flows of the Credit Parties
and their Subsidiaries as of such date and for such periods.

         6.2 No Material Change. Except as set forth on Schedule 6.2, since
December 31, 1995, there has been no development or event relating to or
affecting a Credit Party or any of their Subsidiaries which has had or would be
reasonably expected to have a Material Adverse Effect.

         6.3 Organization and Good Standing. Each Credit Party and each of its
Material Subsidiaries (a) is either a corporation duly incorporated or a
partnership duly formed, validly existing and in good standing under the laws of
the State (or other jurisdiction) of its incorporation or formation, as the case
may be, (b) is duly qualified and in good standing as a foreign corporation or
foreign partnership and is authorized to do business in every jurisdiction where
it does business unless the failure to be so qualified, in good standing or
authorized would not have or would not be reasonably expected to have a Material
Adverse Effect and (c) has the requisite corporate or partnership power and
authority to own its properties and to carry on its business as now conducted
and as proposed to be conducted.

         6.4 Due Authorization. Each Credit Party (a) has the requisite
corporate or partnership power and authority to execute, deliver and perform
this Credit Agreement and the other Credit Documents to which it is a party and
to incur the obligations herein and therein provided for and (b) is duly
authorized to, and has been authorized by all necessary corporate or partnership
action, to execute, deliver and perform this Credit Agreement and the other
Credit Documents to which it is a party.

         6.5 No Conflicts. Neither the execution and delivery of the Credit
Documents, nor the consummation of the transactions contemplated therein, nor
performance of and compliance with the terms and provisions thereof by such
Credit Party will (a) violate or conflict with any provision of its articles or
certificate of incorporation or bylaws, (b) violate, contravene or materially
conflict with any Requirement of Law or any other law, regulation (including,
without limitation, Regulation U or Regulation X), order, writ, judgment,
injunction, decree or permit applicable to it, if the result thereof could cause
or be reasonably expected to cause a Material Adverse Effect, (c) violate,
contravene or conflict with contractual provisions of, or cause an event of
default under, any indenture, loan agreement, mortgage, deed of trust, contract
or other agreement or instrument to which it is a party or by which it may be
bound, if the result thereof could cause or be reasonably expected to cause a
Material Adverse Effect, or (d) result in or require the creation of any Lien
upon or with respect to its properties.



                                       55

<PAGE>



         6.6 Consents. Except for consents, approvals and authorizations which
have been obtained, no consent, approval, authorization or order of, or filing,
registration or qualification with, any court or Governmental Authority or third
party in respect of any Credit Party is required in connection with the
execution, delivery or performance of this Credit Agreement or any of the other
Credit Documents by such Credit Party.

         6.7 Enforceable Obligations. This Credit Agreement and the other Credit
Documents have been duly executed and delivered and constitute legal, valid and
binding obligations of each Credit Party thereto enforceable against such Credit
Party in accordance with their respective terms, except as may be limited by
bankruptcy or insolvency laws or similar laws affecting creditors' rights
generally or by general equitable principles.

         6.8 No Default. No Credit Party, nor any of its Subsidiaries, is in
default under any contract, lease, loan agreement, indenture, mortgage, security
agreement or other agreement or obligation to which it is a party or by which
any of its properties is bound which default would have or would be reasonably
expected to have a Material Adverse Effect.

         6.9 Liens. None of the assets of the Credit Parties, nor any of their
Subsidiaries, is subject to any Lien other than Permitted Liens.

         6.10 Indebtedness. As of the Closing Date, the Credit Parties have no
Indebtedness except (a) as disclosed in the financial statements referenced in
Section 6.1, (b) as set forth on Schedule 6.10 and (c) as otherwise permitted by
this Credit Agreement.

         6.11 Litigation. Except as set forth on Schedule 6.11, there are no
actions, suits or legal, equitable, arbitration or administrative proceedings,
pending or, to the knowledge of any Credit Party, threatened against, the
Borrower or any of its Subsidiaries which could have or might be reasonably
expected to have a Material Adverse Effect.

         6.12 Taxes. Except as set forth on Schedule 6.12, each Credit Party,
and each of its Subsidiaries, has filed, or caused to be filed, all tax returns
(federal, state, local and foreign) required to be filed and paid (a) all
amounts of taxes shown thereon to be due (including interest and penalties) and
(b) all other taxes, fees, assessments and other governmental charges (including
mortgage recording taxes, documentary stamp taxes and intangibles taxes) owing
by it, except for such taxes (i) which are not yet delinquent or (ii) that are
being contested in good faith and by proper proceedings, and against which
adequate reserves are being maintained in accordance with GAAP. No Credit Party
is aware of any proposed tax assessments issued by a taxing authority to and
against such Credit Party, except as would not have or be reasonably expected to
have a Material Adverse Effect.

         6.13 Compliance with Law. Each Credit Party, and each of its
Subsidiaries, is in compliance with all Requirements of Law and all other laws,
rules, regulations, orders and decrees (including without limitation
Environmental Laws) applicable to it, or to its properties, unless such failure
to comply would not have or would not be reasonably expected to have a Material
Adverse Effect.



                                       56

<PAGE>



         6.14 ERISA. Except as set forth on Schedule 6.14 or except as would not
result or be reasonably expected to result in a Material Adverse Effect:

                  (a) During the five-year period prior to the date on which
         this representation is made or deemed made: (i) no Termination Event
         has occurred, and, to the best knowledge of the Credit Parties, no
         event or condition has occurred or exists as a result of which any
         Termination Event could reasonably be expected to occur, with respect
         to any Plan; (ii) no "accumulated funding deficiency," as such term is
         defined in Section 302 of ERISA and Section 412 of the Code, whether or
         not waived, has occurred with respect to any Plan; (iii) each Plan has
         been maintained, operated, and funded in compliance with its own terms
         and in material compliance with the provisions of ERISA, the Code, and
         any other applicable federal or state laws; and (iv) no lien in favor
         or the PBGC or a Plan has arisen or is reasonably likely to arise on
         account of any Plan.

                  (b) The actuarial present value of all "benefit liabilities"
         under each Single Employer Plan (determined within the meaning of
         Section 401(a)(2) of the Code, utilizing the actuarial assumptions used
         to fund such Plans), whether or not vested, did not, as of the last
         annual valuation date prior to the date on which this representation is
         made or deemed made, exceed the current value of the assets of such
         Plan allocable to such accrued liabilities.

                  (c) Neither the Borrower, nor any of its Subsidiaries nor any
         ERISA Affiliate has incurred, or, to the best knowledge of the Credit
         Parties, are reasonably expected to incur, any withdrawal liability
         under ERISA to any Multiemployer Plan or Multiple Employer Plan that
         could have or be reasonably expected to have a Material Adverse Effect.
         Neither the Borrower, any of its Subsidiaries nor any ERISA Affiliate
         has received any notification that any Multiemployer Plan is in
         reorganization (within the meaning of Section 4241 of ERISA), is
         insolvent (within the meaning of Section 4245 of ERISA), or has been
         terminated (within the meaning of Title IV of ERISA), and no
         Multiemployer Plan is, to the best knowledge of the Credit Parties,
         reasonably expected to be in reorganization, insolvent, or terminated.
         For the purposes of this subsection (c), "ERISA Affiliate" means an
         entity, whether or not incorporated, which is under common control with
         any Credit Party or any of its Subsidiaries within the meaning of
         Section 4001(a)(14) of ERISA, or is a member of a group which includes
         any Credit Party or any of its Subsidiaries and which is treated as a
         single employer under Section 414(b), (c), (m), or (o) of the Code.

                  (d) No prohibited transaction (within the meaning of Section
         406 of ERISA or Section 4975 of the Code) or breach of fiduciary
         responsibility has occurred with respect to a Plan which has subjected
         or to the best knowledge of the Borrower is reasonably likely to
         subject the Borrower or any of its Subsidiaries or any ERISA Affiliate
         to any liability under Sections 406, 409, 502(i), or 502(l) of ERISA or
         Section 4975 of the Code, or under any agreement or other instrument
         pursuant to which the Borrower or any of its Subsidiaries or any ERISA
         Affiliate has agreed or is required to indemnify any person against any
         such liability.

                  (e) The present value (determined using actuarial and other
         assumptions which are reasonable with respect to the benefits provided
         and the employees participating) of the


                                       57

<PAGE>



         liability of the Borrower and its Subsidiaries and each ERISA Affiliate
         for post-retirement welfare benefits to be provided to their current
         and former employees under Plans which are welfare benefit plans (as
         defined in Section 3(1) of ERISA), net of all assets under all such
         Plans allocable to such benefits, are reflected on the Financial
         Statements in accordance with FASB 106.

                  (f) Each Plan which is a welfare plan (as defined in Section
         3(1) of ERISA) to which Sections 601-609 of ERISA and Section 4980B of
         the Code apply has been administered in compliance in all material
         respects with such sections.

         6.15 Subsidiaries. As of the Closing Date, set forth on Schedule 6.15
is a complete and accurate list of all Subsidiaries of each Credit Party,
including the jurisdiction of incorporation or organization for each such
Subsidiary and the location of its facilities and whether such Subsidiary is a
Domestic Subsidiary, a Foreign Subsidiary, a First Tier Foreign Subsidiary or a
Material Subsidiary.

         6.16 Use of Proceeds. The proceeds of the Loans hereunder will be used
solely for the purposes specified in Section 7.10. None of the proceeds of the
Loans or other Extensions of Credit will be used in such a manner as to cause a
violation of Regulation U or X or to make an Investment other than a Permitted
Investment. Following application of the proceeds of each Loan and after giving
effect to any Permitted Acquisition, not more than 25 percent of the value of
the assets either (a) of the Borrower only or (b) of the Borrower and its
Subsidiaries on a consolidated basis (to the extent that such assets are subject
to any restriction contained in any agreement or instrument between the Borrower
and any Lender or any Affiliate of any Lender relating to Indebtedness) will be
Margin Stock (as defined in Regulation U).

         6.17 Government Regulation. No Credit Party, nor any of its
Subsidiaries, is subject to regulation under the Public Utility Holding Company
Act of 1935, the Federal Power Act, the Investment Company Act of 1940 or the
Interstate Commerce Act, each as amended. In addition, no Credit Party, nor any
of its Subsidiaries, is (a) an "investment company" registered or required to be
registered under the Investment Company Act of 1940, as amended, or controlled
by such a company, or (b) a "holding company," or a "Subsidiary company" of a
"holding company," or an "affiliate" of a "holding company" or of a "Subsidiary"
of a "holding company," within the meaning of the Public Utility Holding Company
Act of 1935, as amended. No director or executive officer of the Borrower or any
of its Subsidiaries is a director, executive officer or principal shareholder of
any Lender. For the purposes hereof the terms "director", "executive officer"
and "principal shareholder" (when used with reference to any Lender) have the
respective meanings assigned thereto in Regulation O issued by the Board of
Governors of the Federal Reserve System.



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<PAGE>



         6.18     Environmental Matters.

                  Except as disclosed on Schedule 6.18 or except as would not
         have or be reasonably expected to have a Material Adverse Effect:

                                  (i) Each of the real properties owned or
                  leased by the Credit Parties or any of their Subsidiaries (the
                  "Real Properties") and all operations at the Real Properties
                  are in compliance with all applicable Environmental Laws, and
                  there is no violation of any Environmental Law with respect to
                  the Real Properties or the businesses operated by the Borrower
                  or any of their Subsidiaries (the "Businesses"), and there are
                  no conditions relating to the Businesses or Real Properties
                  that would be reasonably expected to give rise to liability
                  under any applicable Environmental Laws.

                                 (ii) No Credit Party has received any written
                  notice of, or written inquiry from any Governmental Authority
                  regarding, any violation, alleged violation, non-compliance,
                  liability or potential liability regarding Hazardous Materials
                  or compliance with Environmental Laws with regard to any of
                  the Real Properties or the Businesses, nor does the Borrower
                  or any of its Subsidiaries have knowledge that any such notice
                  is being threatened.

                                (iii) Hazardous Materials have not been
                  transported or disposed of from the Real Properties, or
                  generated, treated, stored or disposed of at, on or under any
                  of the Real Properties, in each case by, or on behalf or with
                  the permission of, the Borrower or any of its Subsidiaries in
                  a manner that would reasonably be expected to give rise to
                  liability under any applicable Environmental Law.

                                 (iv) No judicial proceeding or governmental or
                  administrative action is pending or, to the knowledge of the
                  Borrower or any of its Subsidiaries, threatened, under any
                  Environmental Law to which the Borrower or any of its
                  Subsidiaries is or will be named as a party, nor are there any
                  consent decrees or other decrees, consent orders,
                  administrative orders or other orders, or other administrative
                  or judicial requirements outstanding under any Environmental
                  Law with respect to the Borrower or any of its Subsidiaries,
                  the Real Properties or the Businesses, in any amount
                  reportable under the federal Comprehensive Environmental
                  Response, Compensation and Liability Act or any analogous
                  state law, except releases in compliance with any
                  Environmental Laws.

                                  (v) There has been no release of Hazardous
                  Materials at or from the Real Properties, or arising from or
                  related to the operations (including, without limitation,
                  disposal) of the Borrower or any of its Subsidiaries in
                  connection with the Real Properties or otherwise in connection
                  with the Businesses.

                                 (vi) None of the Real Properties contains, or 
                  has previously contained, any Hazardous Materials at, on or 
                  under the Real Properties in amounts


                                       59

<PAGE>



                  or concentrations that, if released, constitute or constituted
                  a violation of, or could give rise to liability under,
                  Environmental Laws.

                                (vii) No Credit Party, nor any of its
                  Subsidiaries, has assumed any liability of any Person (other
                  than another Credit Party) under any Environmental Law.

         6.19 Intellectual Property. Each Credit Party, and each of its
Subsidiaries, owns, or has the legal right to use, all trademarks, tradenames,
patents, copyrights, technology, know-how and processes (the "Intellectual
Property") necessary for each of them to conduct its business as currently
conducted except for those the failure to own or have such legal right to use
would not have or be reasonably expected to have a Material Adverse Effect.

         6.20 Investments. All Investments of each Credit Party and each of its
Material Subsidiaries are either Permitted Investments or otherwise permitted by
the terms of this Credit Agreement.

         6.21 Disclosure. To the best of the Borrower's knowledge, when taken
together with all information disclosed or reflected in the Disclosure
Documents, in each case, as amended, modified or supplemented from time to time
prior to the time this representation is made or deemed made by the Borrower, no
written or formally presented information and data concerning the Borrower and
its Subsidiaries (except for financial statements, projections, annual business
plans and budgets and except for information and data published by Persons other
than (a) the Borrower or its Subsidiaries and (b) before the Spin-Off, Corning
Incorporated or its Subsidiaries) which are made available to any Lender in
connection with this Credit Agreement or any other Credit Document contain any
untrue statement of material fact or omit to state a material fact necessary in
order to make the statement therein not materially misleading in light of the
circumstances under which such statements are made.


                                    SECTION 7

                              AFFIRMATIVE COVENANTS

         Each Credit Party hereby covenants and agrees that until all
Commitments and Letters of Credit have been terminated and the Loans and LOC
Obligations, together with interest and fees hereunder, have been paid in full:

         7.1 Information Covenants. The Borrower will furnish, or cause to be
furnished, to the Administrative Agent and each of the Lenders:

                  (a) Annual Financial Statements. As soon as available, and in
         any event within 90 days after the close of each fiscal year of the
         Borrower, a consolidated balance sheet and income statement of the
         Borrower and its Subsidiaries, as of the end of such fiscal year,
         together with related consolidated statements of stockholder's equity
         and of cash flows for such fiscal year, setting forth in comparative
         form consolidated figures for the preceding


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<PAGE>



         fiscal year, all such financial information described above to be in
         reasonable form and detail and audited by independent certified public
         accountants of recognized national standing reasonably acceptable to
         the Agents and whose opinion shall be to the effect that such financial
         statements have been prepared in accordance with GAAP (except for
         changes with which such accountants concur) and shall not be limited as
         to the scope of the audit or qualified in any manner.

                  (b) Quarterly Financial Statements. As soon as available, and
         in any event within 60 days after the close of the first three quarters
         of each fiscal year of the Borrower, (i) a consolidated balance sheet
         and income statement of the Borrower and its Subsidiaries, as of the
         end of such fiscal quarter, together with related consolidated
         statements of cash flows for such fiscal quarter in each case setting
         forth in comparative form consolidated figures for the corresponding
         period of the preceding fiscal year, all such financial information
         described above to be in reasonable form and detail and reasonably
         acceptable to the Agents, and accompanied by a certificate of the chief
         financial officer of the Borrower to the effect that such quarterly
         financial statements fairly present in all material respects the
         financial condition of the Borrower and its Subsidiaries and have been
         prepared in accordance with GAAP, subject to changes resulting from
         audit and normal year-end audit adjustments and (ii) a management
         discussion and analysis of operating results for such fiscal quarter.

                  (c) Officer's Certificate. At the time of delivery of the
         financial statements provided for in Sections 7.1(a) and 7.1(b) above,
         a certificate of the chief financial officer of the Borrower
         substantially in the form of Exhibit 7.1(c), (i) demonstrating
         compliance with the financial covenants contained in Section 7.2 by
         calculation thereof as of the end of each such fiscal period, and
         showing the calculation of the Adjusted Leverage Ratio for purposes of
         determining Applicable Percentage, (ii) certifying as to which
         Subsidiaries are Material Subsidiaries and calculating the percentage
         of total assets of the Borrower and its Subsidiaries, on a consolidated
         basis, owned by (x) the Credit Parties and (y) First Tier Foreign
         Subsidiaries in which the Lenders have received a pledge of 65% of
         their Voting Stock, and (iii) stating that no Default or Event of
         Default has occurred and is continuing, or if any Default or Event of
         Default has occurred and is continuing, specifying the nature and
         extent thereof and what action the Borrower proposes to take with
         respect thereto.

                  (d) Auditor's Reports. Promptly upon receipt thereof, a copy
         of any "management letter" submitted by independent accountants to the
         Borrower or any of its Subsidiaries in connection with any annual audit
         of the books of the Borrower or any of its Subsidiaries.

                  (e) Reports. (i) Promptly upon transmission or receipt
         thereof, copies of any filings and registrations with, and reports to
         or from, the Securities and Exchange Commission, or any successor
         agency, and copies of all financial statements, proxy statements,
         notices and reports as the Borrower or any of its Subsidiaries shall
         send to its shareholders generally and (ii) upon the reasonable written
         request of an Agent, all reports and written information to and from
         the United States Environmental Protection Agency, or any state or
         local agency responsible for environmental matters, the United States
         Occupational Health and Safety Administration, or any state or local
         agency responsible for


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         health and safety matters, or any successor agencies or authorities
         concerning environmental, health or safety matters.

                  (f) Notices. Upon the Borrower obtaining knowledge thereof,
         the Borrower will give written notice to the Administrative Agent
         promptly of (i) the occurrence of an event or condition consisting of a
         Default or Event of Default, specifying the nature and existence
         thereof and what action the Borrower proposes to take with respect
         thereto, and (ii) the occurrence of any of the following with respect
         to the Borrower or any of its Subsidiaries (x) the pendency or
         commencement of any litigation, arbitral or governmental proceeding
         against the Borrower or any of its Subsidiaries which if adversely
         determined would have or would be reasonably expected to have a
         Material Adverse Effect, or (y) the institution of any proceedings
         against the Borrower or any of its Subsidiaries with respect to, or the
         receipt of notice by such Person of potential liability or
         responsibility for violation, or alleged violation of any federal,
         state or local law, rule or regulation, including but not limited to,
         Environmental Laws, the liability for the violation of which would have
         or would be reasonably expected to have a Material Adverse Effect.

                  (g) ERISA. Upon any of the Credit Parties or any ERISA
         Affiliate obtaining knowledge thereof, Borrower will give written
         notice to the Administrative Agent and each of the Lenders promptly
         (and in any event within five Business Days) of: (i) any event or
         condition, including, but not limited to, any Reportable Event, that
         constitutes, or might reasonably lead to, a Termination Event; (ii)
         with respect to any Multiemployer Plan, the receipt of notice as
         prescribed in ERISA or otherwise of any withdrawal liability assessed
         against the Borrowers or any of their ERISA Affiliates, or of a
         determination that any Multiemployer Plan is in reorganization or
         insolvent (both within the meaning of Title IV of ERISA); (iii) the
         failure to make full payment on or before the due date (including
         extensions) thereof of all amounts which the Borrower or any of its
         Subsidiaries or ERISA Affiliates is required to contribute to each Plan
         pursuant to its terms and as required to meet the minimum funding
         standard set forth in ERISA and the Code with respect thereto; or (iv)
         any change in the funding status of any Plan that could or could be
         reasonably expected to have a Material Adverse Effect; together, with a
         description of any such event or condition or a copy of any such notice
         and a statement by the principal financial officer of the Borrower
         briefly setting forth the details regarding such event, condition, or
         notice, and the action, if any, which has been or is being taken or is
         proposed to be taken by the Credit Parties with respect thereto.
         Promptly upon request, the Borrower shall furnish the Administrative
         Agent and each of the Lenders with such additional information
         concerning any Plan as may be reasonably requested, including, but not
         limited to, copies of each annual report/return (Form 5500 series), as
         well as all schedules and attachments thereto required to be filed with
         the Department of Labor and/or the Internal Revenue Service pursuant to
         ERISA and the Code, respectively, for each "plan year" (within the
         meaning of Section 3(39) of ERISA).

                  (h)      Environmental.

                  (i) Subsequent to a notice from the Borrower pursuant to
         Section 7.1(f)(ii)(y) or during the existence of an Event of Default,
         and upon the written


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<PAGE>



                  request of an Agent, the Borrower will furnish or cause to be
                  furnished to the Administrative Agent, at the Borrower's
                  expense, a report of an environmental assessment of reasonable
                  scope, form and depth, including, where appropriate, invasive
                  soil or groundwater sampling, by a consultant reasonably
                  acceptable to the Agents as to the nature and extent of the
                  presence of any Hazardous Materials on any property owned,
                  leased or operated by a Credit Party and as to the compliance
                  by the Credit Parties with Environmental Laws. If the Borrower
                  fails to deliver such an environmental report within
                  seventy-five (75) days after receipt of such written request
                  then the Agents may arrange for same, and the Borrower hereby
                  grants to the Agents and their representatives access to the
                  Real Properties and a license of a scope reasonably necessary
                  to undertake such an assessment (including, where appropriate,
                  invasive soil or groundwater sampling). The reasonable cost of
                  any assessment arranged for by the Agents pursuant to this
                  provision will be payable by the Borrower on demand and added
                  to the Credit Party Obligations.

                                 (ii) Each Credit Party will conduct and
                  complete all investigations, studies, sampling, and testing
                  and all remedial, removal, and other actions necessary to
                  address all Hazardous Materials on, from, or affecting any
                  Real Property to the extent necessary to be in compliance with
                  all Environmental Laws and all other applicable federal,
                  state, and local laws, regulations and rules and with the
                  orders and directives of all Governmental Authorities
                  exercising jurisdiction over such Real Property to the extent
                  any failure would have or be reasonably expected to have a
                  Material Adverse Effect.

                  (i) Other Information. With reasonable promptness upon any
         such request, such other information regarding the business, properties
         or financial condition of the Credit Parties as an Agent may reasonably
         request, including, without limitation, appraisals on personal
         property.

         7.2  Financial Covenants.

                  (a) Leverage Ratio. The Leverage Ratio, as of the end of each
         fiscal quarter of the Borrower for the twelve month period ending on
         such date, shall be less than or equal to:

                            (i) On December 31, 1996 and March 31, 1997, 3.30 to
                                1.0;

                           (ii) On June 30, 1997 and September 30, 1997, 3.25 to
                                1.0;

                          (iii) On December 31, 1997 and March 31, 1998, 3.00
                                to 1.0; and (iv) On June 30, 1998 and on the 
                                last day of each fiscal quarter of the Borrower 
                                thereafter, 2.75 to 1.0.

                  (b) Fixed Charge Coverage Ratio. The Fixed Charge Coverage
         Ratio, as of the end of each fiscal quarter of the Borrower for the
         twelve month period ending on such date, shall be greater than or equal
         to:



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<PAGE>



                            (i) On the last day of each fiscal quarter of the 
                                Borrower from the Closing Date to and including 
                                September 30, 1997, 2.0 to 1.0; and

                           (ii) On December 31, 1997 and on the last day of 
                                each fiscal quarter of the Borrower thereafter, 
                                2.25 to 1.0.

         7.3 Preservation of Existence and Franchises. Each of the Credit
Parties will, and will cause all of their Subsidiaries to, do all things
necessary to preserve and keep in full force and effect its existence, rights,
franchises and authority except (a) as permitted by Section 8.4 or (b) as would
not have or be reasonably expected to have a Material Adverse Effect.

         7.4 Books and Records. Each of the Credit Parties will, and will cause
all of their Material Subsidiaries to, keep complete and accurate books and
records of its transactions in accordance with good accounting practices on the
basis of GAAP (including the establishment and maintenance of appropriate
reserves).

         7.5 Compliance with Law. Each of the Credit Parties will comply, and
will cause all of their Subsidiaries to comply, with all laws, rules,
regulations and orders, and all applicable restrictions imposed by all
Governmental Authorities, applicable to it and its property (including, without
limitation, Environmental Laws) unless such non-compliance would not have or
would not be reasonably expected to have a Material Adverse Effect.

         7.6 Payment of Taxes and Other Indebtedness. Each of the Credit Parties
will, and will cause all of their Subsidiaries to, pay, settle or discharge (a)
all taxes, assessments and governmental charges or levies imposed upon it, or
upon its income or profits, or upon any of its properties, before they shall
become delinquent, (b) all lawful claims (including claims for labor, materials
and supplies) which, if unpaid, might give rise to a Lien upon any of its
properties, and (c) except as prohibited hereunder, all of its other
Indebtedness as it shall become due; provided, however, that a Credit Party
shall not be required to pay any such tax, assessment, charge, levy, claim or
Indebtedness which is being contested in good faith by appropriate proceedings
and as to which adequate reserves therefor have been established in accordance
with GAAP, unless the failure to make any such payment would have a Material
Adverse Effect.

         7.7 Insurance. The Borrower will, for itself and on behalf of each of
its Subsidiaries, at all times maintain in full force and effect insurance
(including worker's compensation insurance, liability insurance, casualty
insurance and business interruption insurance) in such amounts, covering such
risks and liabilities and with such deductibles or self-insurance retentions as
are in accordance with normal industry practice. The insurance coverage of the
Borrower and its Subsidiaries, as of the Closing Date, is outlined as to
carrier, policy number, expiration date, type and amount on Schedule 7.7.

         7.8 Maintenance of Property. Except as permitted by Section 7.3, each
of the Credit Parties will, and will cause their Subsidiaries to, maintain and
preserve its properties and equipment in good repair, working order and
condition, normal wear and tear excepted (subject to damage by casualties), and
will make, or cause to be made, in such properties and equipment from time to
time


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<PAGE>



all repairs, renewals, replacements, extensions, additions, betterments and
improvements thereto as may be needed or proper, to the extent and in the manner
customary for companies in similar businesses unless the failure to do so would
not have or would not be reasonably expected to have a Material Adverse Effect.

         7.9 Performance of Obligations. Each of the Credit Parties will, and
will cause their Subsidiaries to, perform in all respects all of its obligations
under the terms of all agreements, indentures, mortgages, security agreements or
other debt instruments to which it is a party or by which it is bound unless the
failure to do so would not have or be reasonably expected to have a Material
Adverse Effect.

         7.10 Use of Proceeds. The Borrower will use the proceeds of the Loans
solely (a) to effect the Spin-Off including refinancing the current existing
intercompany debt of the Borrower and its Subsidiaries and the payment of any
federal consolidated tax liabilities of the Borrower and its Subsidiaries and
(b) to provide for working capital, capital expenditures, acquisitions and other
lawful corporate purposes of the Borrower and its Subsidiaries.

         7.11 Audits/Inspections. Upon reasonable notice and during normal
business hours and in a manner that will not unreasonably interfere with its
business operations, each Credit Party will, and will cause their Subsidiaries
to, permit representatives appointed by an Agent (and upon the request of the
Required Lenders, an Agent shall make such appointment), including, without
limitation, independent accountants, agents, attorneys and appraisers to visit
and inspect such Credit Party's or Subsidiaries' property, including its books
and records, its accounts receivable and inventory, its facilities and its other
business assets, and to make photocopies or photographs thereof and to write
down and record any information such representative obtains and shall permit an
Agent or its representatives to investigate and verify the accuracy of
information provided to the Lenders, and to discuss all such matters with the
officers, employees and representatives of the Credit Parties and their
Subsidiaries.

         7.12 Additional Credit Parties. Within 30 days after the date the
officer's certificate is due pursuant to Section 7.1(c), the Borrower shall
cause (a) each Person who is a Material Domestic Subsidiary who is not already a
Guarantor to execute a Joinder Agreement in substantially the form of Exhibit
7.12, (b) itself and each Domestic Subsidiary that directly owns a Material
First Tier Foreign Subsidiary to pledge 65% of the Voting Stock of such Material
First Tier Foreign Subsidiary pursuant to a Pledge Agreement (to the extent 65%
of the Voting Stock of such Material First Tier Foreign Subsidiary was not
previously pledged), (c) itself and each Material Domestic Subsidiary that has
loaned money to a Non-Material Domestic Subsidiary to evidence such loan by an
enforceable promissory note and to deliver such promissory note, together with a
Collateral Assignment of Note and endorsement thereto (to the extent not
previously delivered), (d) such other Persons to execute Joinder Agreements or
pledge Voting Stock as required by Section 7.15, and (e) deliver such other
documentation as the Administrative Agent may reasonably request in connection
with the foregoing, including, without limitation, (i) appropriate certified
resolutions and other organizational and authorizing documents of such Person,
(ii) favorable opinions of counsel to such Person (which shall cover, among
other things, the legality, validity, binding effect and enforceability of the
documentation referred to above), all in form, content and scope reasonably
satisfactory to the Administrative Agent, and (iii) stock certificates with
stock powers executed in


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<PAGE>



blank or evidence of perfection (which may include opinions) regarding
uncertificated securities and/or original promissory notes with executed
endorsements attached thereto. The Lenders agree that within 30 days after
receipt of reasonably sufficient evidence that (x) a Domestic Subsidiary ceases
to be a Material Domestic Subsidiary or (y) a Material First Tier Foreign
Subsidiary ceases to be a First Tier Foreign Subsidiary or ceases to be a
Material Foreign Subsidiary, then either such Domestic Subsidiary shall be
released from its obligations as a Guarantor or the stock of such Foreign
Subsidiary shall be returned to the Domestic Subsidiary pledging such stock. The
Lenders further agree that within 30 days after notice from the Borrower that
any loan or series of loans referred to in clause (c) above has been repaid in
full, then the pledge of the promissory note evidencing such loan shall be
terminated and the Administrative Agent shall release and return such promissory
note, together with the related Collateral Assignment of Note, to the Borrower
or such Material Domestic Subsidiary, as the case may be. The Agent is hereby
authorized in connection with the events described in the prior two sentences,
at the expense of the Borrower, to execute such documentation as appropriate to
evidence such release or return unless, in the circumstances described in (x)
and (y) above, such release or return would cause a violation of Section 7.15.

         7.13 Spin-Off. On or before March 31, 1997, the Agents shall have
received (a) evidence reasonably sufficient to them that (i) the Spin-Off has
occurred in accordance with applicable law and the terms and conditions of the
IRS Letter Ruling issued in connection therewith and (ii) the intercompany debt
has been repaid in connection with the Spin-Off, (b) copies of the Tax
Indemnification Agreements, the Tax Sharing Agreement and the Transaction
Agreement (which shall be in substantially the form delivered to the Lenders on
or before the Effective Date) and, if requested by a Lender, copies of all other
documents executed and delivered in connection with the Spin-Off, and (c) the
registration statement filed by the Borrower and declared effective by the
Securities and Exchange Commission.

         7.14 Uncertificated Securities. On or before March 31, 1997, the
Administrative Agent shall have received evidence satisfactory to it that the
Lenders have a first priority perfected security interest in the uncertificated
securities pledged on the Closing Date pursuant to the Pledge Agreements,
including, without limitation, opinions from foreign counsel.

         7.15 Additional Guarantors or Additional Pledges of Stock. (a) The
Borrower shall take all necessary action, at the times specified by the second
and third sentences of this Section 7.15(a), in respect of each fiscal quarter,
to ensure that, as of the last day of such fiscal quarter (after giving effect
to any Joinder Agrement and/or Pledge Agreement executed in respect of such
fiscal quarter pursuant to Section 7.12), the combined sum of the total assets
(excluding assets that pursuant to GAAP principles of consolidation would be
eliminated from the consolidated balance sheet of the Borrower as of such date)
owned by (a) the Credit Parties (together with their Subsidiaries on a
consolidated basis) and (b) the First Tier Foreign Subsidiaries in which the
Lenders have received a pledge of at least 65% of their Voting Stock (together
with their Subsidiaries on a consolidated basis) is greater than or equal to 80%
of the total assets owned by the Borrower and its Subsidiaries on a consolidated
basis. If on the date the officer's certificate is required to be delivered by
Section 7.1(c), the Borrower is not in compliance with the first sentence of
this Section 7.15(a), then, within 30 days after the due date of such
certificate, the Borrower shall do either or both of the following (as the
Borrower shall choose in its discretion): (a) cause additional Domestic
Subsidiaries to execute and deliver Joinder Agreements or (b) pledge or cause
one or more of its Domestic


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Subsidiaries to pledge (pursuant to a Pledge Agreement) 65% of the Voting Stock
of one or more additional First Tier Foreign Subsidiaries to the extent
necessary to be in compliance with the first sentence of this Section 7.15(a)
and to deliver such other documents, instruments, certificates or opinions in
connection therewith as required in connection with the execution of Joinder
Agreements or the pledge of Voting Stock as set forth in Section 7.12(e).

         (b) If, as of the last day of any fiscal quarter of the Borrower, the
percentage of total assets determined pursuant to the first sentence of Section
7.15(a) is greater than 80%, then, within 30 days of notice thereof by the
Borrower, the Lenders shall, as directed by the Borrower in its discretion, (i)
release any Domestic Subsidiary (other than a Material Domestic Subsidiary) from
its obligation as Guarantor and (ii) such pledged Voting Stock of any First Tier
Foreign Subsidiary (other than a Material First Tier Foreign Subsidiary),
together with any such other documents, instruments or certificates which were
delivered in connection with the execution of any Joinder Agreement executed by
such Domestic Subsidiary or pledge of Voting Stock by such Foreign Subsidiary;
provided however, that after giving effect to such release or return, the
Borrower and its Subsidiaries shall be in compliance with Section 7.15(a).

                                    SECTION 8

                               NEGATIVE COVENANTS

         Each Credit Party hereby covenants and agrees that until all
Commitments and Letters of Credit have been terminated and the Loans and LOC
Obligations, together with interest and fees hereunder, have been paid in full:

         8.1 Indebtedness. No Credit Party will, nor will it permit any of its
Subsidiaries to, contract, create, incur, assume or permit to exist any
Indebtedness, except:

                  (a) Indebtedness arising under this Credit Agreement and the
         other Credit Documents;

                  (b) Indebtedness existing as of the Closing Date as referenced
         in Section 6.10 (and renewals, refinancings or extensions thereof on
         terms and conditions substantially the same as such existing
         Indebtedness and in a principal amount not in excess of that
         outstanding as of the date of such renewal, refinancing or extension);

                  (c) Indebtedness in respect of current accounts payable and
         accrued expenses incurred in the ordinary course of business including,
         to the extent not current, accounts payable and accrued expenses that
         are subject to bona fide dispute;

                  (d) purchase money Indebtedness (including Capital Leases)
         incurred by the Borrower or any of its Subsidiaries to finance the
         purchase of fixed assets; provided that (i) the total of all such
         Indebtedness for all such Persons taken together shall not exceed an
         aggregate principal amount of $10,000,000 at any one time outstanding
         (including any such Indebtedness referred to in subsection (b) above);
         (ii) such Indebtedness when incurred shall not exceed the purchase
         price of the asset(s) financed; and (iii) no such Indebtedness shall


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         be refinanced for a principal amount in excess of the principal balance
         outstanding thereon at the time of such refinancing;

                  (e) other unsecured Indebtedness owing by Domestic
         Subsidiaries not to exceed, in the aggregate, at any one time,
         $10,000,000; and

                  (f) other unsecured Indebtedness owing by Foreign Subsidiaries
         not to exceed, in the aggregate, at any one time, $10,000,000.

         8.2 Liens. No Credit Party will, nor will it permit its Subsidiaries
to, contract, create, incur, assume or permit to exist any Lien with respect to
any of its property or assets of any kind (whether real or personal, tangible or
intangible), whether now owned or after acquired, except for Permitted Liens.

         8.3 Nature of Business. The Borrower will not, and will not permit its
Material Subsidiaries to, engage in any business other than (a) businesses in
which the Borrower (whether directly or through one or more of its Subsidiaries)
engages on the Closing Date or are contemplated by the Information Statement,
(b) similar or related businesses (including, without limitation, similar or
related businesses that serve the industries which purchase or use goods
manufactured or processed or services rendered by, any business in which the
Borrower is then permitted to engage (whether directly or through one or more of
its Subsidiaries), pursuant to this Section 8.3, and (c) businesses incidental
to the foregoing.

         8.4 Consolidation and Merger. No Credit Party will nor will it permit
any Subsidiary to, enter into any transaction of merger or consolidation or
liquidate, wind up or dissolve itself; provided that a Credit Party or a
Subsidiary of a Credit Party may merge or consolidate with or into another
Person if the following conditions are satisfied:

                  (a) the Administrative Agent is given prior written notice of
         such action;

                  (b) if the merger or consolidation involves a Credit Party,
         the Person formed by such consolidation or into which a Credit Party is
         merged shall either (i) be such Credit Party or (ii) be a Domestic
         Subsidiary and shall expressly assume in writing all of the obligations
         of such Credit Party under the Credit Documents; provided that if the
         transaction is between the Borrower and another Person, the Borrower
         must be the surviving entity;

                  (c) if the merger or consolidation involves a Material First
         Tier Foreign Subsidiary, the Lenders receive 65% of the Voting Stock of
         the surviving Material First Tier Foreign Subsidiary, if any;

                  (d) to the extent otherwise required by Section 7.12 or 7.15,
         the Credit Parties execute and deliver such documents, instruments and
         certificates as the Administrative Agent may request (including, if
         necessary, to maintain its perfection and priority in the collateral
         pledged pursuant to the Collateral Documents;



                                       68

<PAGE>



                  (e) immediately after giving effect to such transaction, no
         Default or Event of Default shall have occurred and be continuing; and

                  (f) the Borrower delivers to the Agents an officer's
         certificate demonstrating compliance with clause (b) or (c) above, as
         applicable, and an opinion of counsel (who may, at the option of the
         Borrower, be the Borrower's in-house counsel) stating that such
         consolidation or merger and any written agreement entered into in
         connection therewith, comply with this Section 8.4.

         8.5 Sale or Lease of Assets. No Credit Party will, nor will it permit
any of its Subsidiaries to, convey, sell, lease, transfer or otherwise dispose
of, in one transaction or a series of transactions, all or any part of its
business or assets whether now owned or hereafter acquired, including, without
limitation, inventory, receivables, equipment, real property interests (whether
owned or leasehold), and securities, other than (a) any inventory sold or
otherwise disposed of in the ordinary course of business; (b) the sale, lease,
transfer or other disposal by a Credit Party (other than the Borrower) of any or
all of its assets to the Borrower or to another Credit Party; (c) obsolete,
slow-moving, idle or worn-out assets (including inventory) no longer used or
useful in its business; (d) the transfer of assets which constitute a Permitted
Investment or (e) such other transfer of assets if (i) such transfer is for fair
market value, (ii) at the time of such transfer no Default or Event of Default
exists and is continuing, (iii) as a result of such transfer no Material Adverse
Effect would occur or be reasonably likely to occur, (iv) the proceeds from such
transfer are not used to pay dividends and (v) the proceeds from such transfer
are, within six months from the date of such transfer, reinvested in a business
of a type similar to that which the Credit Parties and their Subsidiaries are
already engaged or were engaged at the time of such sale.

         8.6 Sale Leasebacks. No Credit Party will directly or indirectly, nor
will it permit its Subsidiaries to, become or remain liable as lessee or as
guarantor or other surety with respect to any lease of any property (whether
real or personal or mixed), whether now owned or hereafter acquired, (a) which
such Credit Party has sold or transferred or is to sell or transfer to any other
Person other than a Credit Party or (b) which such Credit Party intends to use
for substantially the same purpose as any other property which has been sold or
is to be sold or transferred by such Credit Party to any Person in connection
with such lease.

         8.7 Advances, Investments and Loans. No Credit Party will, nor will it
permit its Subsidiaries to, make any Investments except for Permitted
Investments.

         8.8 Restricted Payments. No Credit Party will, directly or indirectly,
nor will it permit its Subsidiaries to, (a) declare or pay any dividends or make
any other distribution upon any shares of its capital stock of any class or (b)
purchase, redeem or otherwise acquire or retire or make any provisions for
redemption, acquisition or retirement of any shares of its capital stock of any
class or any warrants or options to purchase any such shares (any such dividend,
repurchase, redemption, acquisition or retirement being a "Restricted Payment");
provided that (i) any Subsidiary of the Borrower may make Restricted Payments to
the Borrower, (ii) stock dividends may be paid pursuant to the Rights Plan and
the Benefits Plans, (iii) as long as no Default or Event of Default exists and
is continuing, Restricted Payments may be made with respect to (A) the Benefits
Plans of the type referred to in subsection (a) and (b) of the definition of
"Benefits Plans", (B) the Benefits Plans of


                                       69

<PAGE>



the type referred to in subsection (c), (d), (e) and (f) of the definition of
"Benefits Plans" in an aggregate amount not to exceed $50,000,000, during the
term of this Credit Agreement and (C) the Rights Plans in an aggregate amount
not to exceed $2,000,000 during the term of this Credit Agreement, (iv) other
than with proceeds from a sale as set forth in Section 8.5, Restricted Payments
may be made if (A) no Default or Event of Default exists and is continuing and
(B) after giving effect thereto, the Credit Parties and their Subsidiaries are
in compliance with Section 7.2 and (v) the Borrower and any of its Subsidiaries
may repurchase stock of Covance Bio Technology Services Inc. in accordance with
that certain Capital Contribution and Shareholder's Agreement dated as of
February 22, 1995.

         8.9 Fiscal Year; Organizational Documents. Except as set forth on
Schedule 8.9, no Credit Party will, nor will it permit its Subsidiaries to, (a)
change its fiscal year or (b) change its articles or certificate of
incorporation or its bylaws if such change would have or be reasonably expected
to have a Material Adverse Effect.


                                    SECTION 9

                                EVENTS OF DEFAULT

         9.1 Events of Default. An Event of Default shall exist upon the
occurrence of any of the following specified events (each an "Event of
Default"):

                  (a) Payment. Any Credit Party shall default in the payment (i)
         when due of any principal of any of the Loans or any reimbursement
         obligation arising from drawings under Letters of Credit or (ii) within
         three days of when due of any interest on the Loans or any fees or
         other amounts owing hereunder, under any of the other Credit Documents
         or in connection herewith.

                  (b) Representations. Any representation, warranty or statement
         made or deemed to be made by any Credit Party herein, in any of the
         other Credit Documents, or in any state ment or certificate delivered
         or required to be delivered pursuant hereto or thereto shall prove
         untrue in any material respect on the date as of which it was made or
         deemed to have been made.

                  (c)      Covenants.  Any Credit Party shall:

                                    (i) default in the due performance or
                           observance of any term, covenant or agreement
                           contained in Sections 7.2 or 8.1 through 8.9
                           inclusive; or

                                    (ii) default in the due performance or
                           observance by it of any term, covenant or agreement
                           contained in Section 7.1 and such default shall
                           continue unremedied for a period of five Business
                           Days after the earlier of an officer of the Borrower
                           becoming aware of such default or notice thereof
                           given by an Agent; or



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                                (iii) default in the due performance or
                  observance by it of any term, covenant or agreement (other
                  than those referred to in subsections (a), (b) or (c)(i) or
                  (ii) of this Section 9.1) contained in this Credit Agreement
                  and such default shall continue unremedied for a period of at
                  least 20 Business Days after notice thereof given by an Agent.

                  (d) Other Credit Documents. (i) Any Credit Party shall default
         in the due performance or observance of any term, covenant or agreement
         in any of the other Credit Documents and such default shall continue
         unremedied for a period of at least 20 Business Days after notice
         thereof given by an Agent, or (ii) any Credit Document shall fail to be
         in full force and effect or the Borrower shall so assert or any Credit
         Document shall fail to give the Agents and/or the Lenders the security
         interests, liens, rights, powers and privileges purported to be created
         thereby.

                  (e) Guaranties. The guaranty given by the Credit Parties
         hereunder or by any Additional Credit Party hereafter or any provision
         thereof shall cease to be in full force and effect, or any guarantor
         thereunder or any Person acting by or on behalf of such guarantor shall
         deny or disaffirm such Guarantor's obligations under such guaranty.

                  (f) Bankruptcy, etc. The occurrence of any of the following
         with respect to the Borrower or any of its Material Subsidiaries (i) a
         court or governmental agency having juris diction in the premises shall
         enter a decree or order for relief in respect of the Borrower or any of
         its Material Subsidiaries in an involuntary case under any applicable
         bankruptcy, insolvency or other similar law now or hereafter in effect,
         or appoint a receiver, liquidator, assignee, custodian, trustee,
         sequestrator or similar official of the Borrower or any of its Material
         Subsidiaries or for any substantial part of its property or ordering
         the winding up or liquidation of its affairs; or (ii) an involuntary
         case under any applicable bankruptcy, insolvency or other similar law
         now or hereafter in effect is commenced against the Borrower or any of
         its Material Subsidiaries and such petition remains unstayed and in
         effect for a period of 60 consecutive days; or (iii) the Borrower or
         any of its Material Subsidiaries shall commence a voluntary case under
         any applicable bankruptcy, insolvency or other similar law now or
         hereafter in effect, or consent to the entry of an order for relief in
         an involuntary case under any such law, or consent to the appointment
         or taking possession by a receiver, liquidator, assignee, custodian,
         trustee, sequestrator or similar official of such Person or any
         substantial part of its property or make any general assignment for the
         benefit of creditors; or (iv) the Borrower or any of its Material
         Subsidiaries shall admit in writing its inability to pay its debts
         generally as they become due or any action shall be taken by such
         Person in furtherance of any of the aforesaid purposes.

                  (g) Defaults under Other Agreements. With respect to any
         Indebtedness (other than Indebtedness outstanding under this Credit
         Agreement) of the Borrower or any of its Subsidiaries in an aggregate
         principal amount in excess of $10,000,000, (i) a Credit Party shall (A)
         default in any payment (beyond the applicable grace period with respect
         thereto, if any) with respect to any such Indebtedness, or (B) default
         (after giving effect to any applicable grace period) in the observance
         or performance relating to such Indebtedness or contained in any
         instrument or agreement evidencing, securing or relating thereto, or
         any


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         other event or condition shall occur or condition exist, the effect of
         which default or other event or condition is to cause, or permit, the
         holder or holders of such Indebtedness (or trustee or agent on behalf
         of such holders) to cause (determined without regard to whether any
         notice or lapse of time is required) any such Indebtedness to become
         due prior to its stated maturity; or (ii) any such Indebtedness shall
         be declared due and payable, or required to be prepaid other than by a
         regularly scheduled required prepayment prior to the stated maturity
         thereof and such Indebtedness remains unpaid; or (iii) any such
         Indebtedness shall mature and remain unpaid.

                  (h) Judgments. One or more judgments, orders, or decrees shall
         be entered against any one or more of the Credit Parties involving a
         liability of $10,000,000 or more, in the aggregate, (to the extent not
         paid or covered by insurance provided by a financially solvent carrier
         who has acknowledged coverage) and such judgments, orders or decrees
         (i) are the subject of any enforcement proceeding commenced by any
         creditor or (ii) shall continue unsatisfied, undischarged and unstayed
         for a period ending on the last day on which such judgment, order or
         decree becomes final and unappealable.

                  (i) ERISA. The occurrence of any of the following events or
         conditions: (A) any "accumulated funding deficiency," as such term is
         defined in Section 302 of ERISA and Section 412 of the Code, whether or
         not waived, shall exist with respect to any Plan, or any lien shall
         arise on the assets of the Borrower or any of its Subsidiaries or any
         ERISA Affiliate in favor of the PBGC or a Plan; (B) a Termination Event
         shall occur with respect to a Single Employer Plan, which is, in the
         reasonable opinion of the Administrative Agent, likely to result in the
         termination of such Plan for purposes of Title IV of ERISA; (C) a
         Termination Event shall occur with respect to a Multiemployer Plan or
         Multiple Employer Plan, which is, in the reasonable opinion of the
         Administrative Agent, likely to result in (i) the termination of such
         Plan for purposes of Title IV of ERISA, or (ii) the Borrower or any of
         its Subsidiaries or any ERISA Affiliate incurring any liability in
         connection with a withdrawal from, reorganization of (within the
         meaning of Section 4241 of ERISA), or insolvency (within the meaning of
         Section 4245 of ERISA) of such Plan; or (D) any prohibited transaction
         (within the meaning of Section 406 of ERISA or Section 4975 of the
         Code) or breach of fiduciary responsibility shall occur which may
         subject the Borrower or any of its Subsidiaries or any ERISA Affiliate
         to any liability under Sections 406, 409, 502(i), or 502(l) of ERISA or
         Section 4975 of the Code, or under any agreement or other instrument
         pursuant to which the Borrower or any of its Subsidiaries or any ERISA
         Affiliate has agreed or is required to indemnify any person against any
         such liability.

                  (j)      Ownership.  There shall occur a Change of Control.

         9.2 Acceleration; Remedies. Following the occurrence and during the
continuance of an Event of Default, the Administrative Agent shall, upon the
request and direction of the Required Lenders, by written notice to the
Borrower, take any of the following actions without prejudice to the rights of
the Agents or any Lender to enforce its claims against the Credit Parties,
except as otherwise specifically provided for herein:



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                  (a) Termination of Commitments. Declare the Commitments
         terminated whereupon the Commitments shall be immediately terminated.

                  (b) Acceleration of Loans. Declare the unpaid principal of and
         any accrued interest in respect of all Loans, any reimbursement
         obligations arising from drawings under Letters of Credit and, without
         duplication, any and all other indebtedness or obligations of any and
         every kind then owing by a Credit Party to any of the Lenders hereunder
         to be due whereupon the same shall be immediately due and payable
         without presentment, demand, protest or other notice of any kind, all
         of which are hereby waived by the Credit Parties.

                  (c) Cash Collateral. Direct the Borrower to pay (and the
         Borrower agrees that upon receipt of such notice, or upon the
         occurrence of an Event of Default under Section 9.1(f), it will
         immediately pay) to the Administrative Agent additional cash, to be
         held by the Administrative Agent, for the benefit of the Lenders, in a
         cash collateral account as security for the LOC Obligations in respect
         of subsequent drawings under all then outstanding Letters of Credit in
         an amount equal to the maximum aggregate amount which may be drawn
         under all Letters of Credits then outstanding.

                  (d) Enforcement of Rights. Enforce any and all rights and
         interests created and existing under the Credit Documents, including,
         without limitation, all rights and remedies against a Guarantor, all
         rights under the Collateral Documents and all rights of set-off.

Notwithstanding the foregoing, if an Event of Default specified in Section
9.1(f) shall occur, then the Commitments shall automatically terminate and all
Loans, all reimbursement obligations under Letters of Credit, all accrued and
unpaid interest in respect thereof, all accrued and unpaid fees and other
indebtedness or obligations owing to the Lenders hereunder shall immediately
become due and payable without the giving of any notice or other action by the
Agents or the Lenders, which notice or other action is expressly waived by the
Credit Parties.

Notwithstanding the fact that enforcement powers reside primarily with the
Administrative Agent, each Lender has, to the extent permitted by law, a
separate right of payment and shall be considered a separate "creditor" holding
a separate "claim" within the meaning of Section 101(5) of the Bankruptcy Code
or any other insolvency statute.

         9.3 Allocation of Payments After Event of Default. Notwithstanding any
other provisions of this Credit Agreement, after the occurrence and during the
continuance of an Event of Default, all amounts collected or received by an
Agent or any Lender on account of amounts outstanding under any of the Credit
Documents or collateral under the Pledge Agreement shall be paid over or
delivered as follows:

                  FIRST, to the payment of all reasonable out-of-pocket costs
         and expenses (including without limitation reasonable attorneys' fees)
         of the Agents in connection with enforcing the rights of the Lenders
         under the Credit Documents and any protective advances made by the
         Administrative Agent under or pursuant to the terms of the Pledge
         Agreement;

                  SECOND, to payment of any fees owed to an Agent or the Issuing
         Lender;


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                  THIRD, to the payment of all reasonable out-of-pocket costs
         and expenses, (including, without limitation, reasonable attorneys'
         fees) of each of the Lenders in connection with enforcing its rights
         under the Credit Documents;

                  FOURTH, to the payment of all accrued fees and interest
         payable to the Lenders hereunder;

                  FIFTH, to the payment of the outstanding principal amount of
         the Loans and unreimbursed drawings under Letters of Credit and to the
         payment or cash collateralization of the outstanding LOC Obligations,
         pro rata, as set forth below;

                  SIXTH, to all other obligations of the Credit Parties which
         shall have become due and payable under the Credit Documents and the
         LOC Documents and not repaid pursuant to clauses "FIRST" through
         "FIFTH" above; and

                  SEVENTH, to the payment of the surplus, if any, to whoever may
         be lawfully entitled to receive such surplus.

In carrying out the foregoing, (a) amounts received shall be applied in the
numerical order provided until exhausted prior to application to the next
succeeding category; (b) each of the Lenders shall receive an amount equal to
its pro rata share (based on the proportion that the then outstanding Loans and
LOC Obligations held by such Lender bears to the aggregate then outstanding
Loans and LOC Obligations of amounts available to be applied pursuant to clauses
"THIRD", "FOURTH," "FIFTH," and "SIXTH" above; and (c) to the extent that any
amounts available for distribution pursuant to clause "FIFTH" above are
attributable to the issued but undrawn amount of outstanding Letters of Credit,
such amounts shall be held by the Administrative Agent in a cash collateral
account and applied (x) first, to reimburse the Issuing Lender from time to time
for any drawings under such Letters of Credit and (y) then, following the
expiration of all Letters of Credit, to all other obligations of the types
described in clauses "FIFTH" and "SIXTH" above in the manner provided in this
Section 9.3.


                                   SECTION 10

                                AGENCY PROVISIONS

         10.1 Appointment. Each Lender hereby designates and appoints
NationsBank, N.A. as Administrative Agent and Wachovia Bank of Georgia, N.A. as
Syndication Agent of such Lender to act as specified herein and the other Credit
Documents and the LOC Documents (including with respect to NationsBank, N.A. the
right to act as the collateral agent under the Collateral Documents), and each
such Lender hereby authorizes the Agents, as the agents for such Lender, to take
such action on its behalf under the provisions of this Credit Agreement and the
other Credit Documents and the LOC Documents and to exercise such powers and
perform such duties as are expressly delegated by the terms hereof and of the
other Credit Documents and of the LOC Documents, together with such other powers
as are reasonably incidental thereto. Notwithstanding any provision to the
contrary elsewhere herein and in the other Credit Documents, the Agents shall
not have any


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duties or responsibilities, except those expressly set forth herein and therein,
or any fiduciary relationship with any Lender, and no implied covenants,
functions, responsibilities, duties, obligations or liabilities shall be read
into this Credit Agreement or any of the other Credit Documents or any of the
LOC Documents, or shall otherwise exist against the Agents. The provisions of
this Section are solely for the benefit of the Agents and the Lenders and none
of the Credit Parties shall have any rights as a third party beneficiary of the
provisions hereof. In performing its functions and duties under this Credit
Agreement and the other Credit Documents and the LOC Documents, each Agent shall
act solely as an agent of the Lenders and does not assume and shall not be
deemed to have assumed any obligation or relationship of agency or trust with or
for any Credit Party.

         10.2 Delegation of Duties. An Agent may execute any of its duties
hereunder or under the other Credit Documents by or through agents or
attorneys-in-fact and shall be entitled to advice of counsel concerning all
matters pertaining to such duties. An Agent shall not be responsible for the
negligence or misconduct of any agents or attorneys-in-fact selected by it with
reasonable care.

         10.3 Exculpatory Provisions. Neither the Agents nor any of their
officers, directors, employees, agents, attorneys-in-fact or affiliates shall be
(a) liable for any action lawfully taken or omitted to be taken by it or such
Person under or in connection herewith or in connection with any of the other
Credit Documents or the LOC Documents (except for its or such Person's own gross
negligence or willful misconduct) or (b) responsible in any manner to any of the
Lenders for any recitals, statements, representations or warranties made by any
of the Credit Parties contained herein or in any of the other Credit Documents
or the LOC Documents or in any certificate, report, document, financial
statement or other written or oral statement referred to or provided for in, or
received by an Agent under or in connection herewith or in connection with the
other Credit Documents or the LOC Documents, or enforceability or sufficiency
therefor of any of the other Credit Documents or the LOC Documents, or for any
failure of the Borrower to perform its obligations hereunder or thereunder. The
Agents shall not be responsible to any Lender for the effectiveness,
genuineness, validity, enforceability, collectibility or sufficiency of this
Credit Agreement, or any of the other Credit Documents or the LOC Documents or
for any representations, warranties, recitals or statements made herein or
therein or made by the Borrower or any Credit Party in any written or oral
statement or in any financial or other statements, instruments, reports,
certificates or any other documents in connection herewith or therewith
furnished or made by an Agent to the Lenders or by or on behalf of the Credit
Parties to the Agents or any Lender or be required to ascertain or inquire as to
the performance or observance of any of the terms, conditions, provisions,
covenants or agreements contained herein or therein or as to the use of the
proceeds of the Loans or the use of the Letters of Credit or of the existence or
possible existence of any Default or Event of Default or to inspect the
properties, books or records of the Credit Parties. The Agents are not trustees
for the Lenders and owe no fiduciary duty to the Lenders.

         10.4 Reliance on Communications. The Agents shall be entitled to rely,
and shall be fully protected in relying, upon any note, writing, resolution,
notice, consent, certificate, affidavit, letter, cablegram, telegram, telecopy,
telex or teletype message, statement, order or other document or conversation
believed by it to be genuine and correct and to have been signed, sent or made
by the proper Person or Persons and upon advice and statements of legal counsel
(including, without limitation, counsel to any of the Credit Parties,
independent accountants and other experts selected


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by the Agents with reasonable care). The Agents may deem and treat the Lenders
as the owner of its interests hereunder for all purposes unless a written notice
of assignment, negotiation or transfer thereof shall have been filed with the
Administrative Agent in accordance with Section 11.3(b). The Agents shall be
fully justified in failing or refusing to take any action under this Credit
Agreement or under any of the other Credit Documents or the LOC Documents unless
it shall first receive such advice or concurrence of the Required Lenders as it
deems appropriate or it shall first be indemnified to its satisfaction by the
Lenders against any and all liability and expense which may be incurred by it by
reason of taking or continuing to take any such action. The Agents shall in all
cases be fully protected in acting, or in refraining from acting, hereunder or
under any of the other Credit Documents or the LOC Documents in accordance with
a request of the Required Lenders (or to the extent specifically provided in
Section 11.6, all the Lenders) and such request and any action taken or failure
to act pursuant thereto shall be binding upon all the Lenders (including their
successors and assigns).

         10.5 Notice of Default. An Agent shall not be deemed to have knowledge
or notice of the occurrence of any Default or Event of Default hereunder unless
such Agent has actual knowledge of such Default or Event of Default or has
received notice from a Lender or a Credit Party referring to the Credit
Document, describing such Default or Event of Default and stating that such
notice is a "notice of default." In the event that the Administrative Agent
receives such a notice or has such actual knowledge, the Administrative Agent
shall give prompt notice thereof to the Lenders. The Administrative Agent shall
take such action with respect to such Default or Event of Default as shall be
reasonably directed by the Required Lenders.

         10.6 Non-Reliance on Agents and Other Lenders. Each Lender expressly
acknowledges that neither the Agents, NationsBanc Capital Markets, Inc. ("NCMI")
nor any of their officers, directors, employees, agents, attorneys-in-fact or
affiliates has made any representations or warranties to it and that no act by
the Agents, NCMI or any affiliate thereof hereinafter taken, including any
review of the affairs of any Credit Party, shall be deemed to constitute any
representation or warranty by the Agents or NCMI to any Lender. Each Lender
represents to the Agents and NCMI that it has, independently and without
reliance upon the Agents or NCMI or any other Lender, and based on such
documents and information as it has deemed appropriate, made its own appraisal
of and investigation into the business, assets, operations, property, financial
and other conditions, prospects and creditworthiness of the Credit Parties and
made its own decision to make its Loans hereunder and enter into this Credit
Agreement. Each Lender also represents that it will, independently and without
reliance upon the Agents, NCMI or any other Lender, and based on such documents
and information as it shall deem appropriate at the time, continue to make its
own credit analysis, appraisals and decisions in taking or not taking action
under this Credit Agreement, and to make such investigation as it deems
necessary to inform itself as to the business, assets, operations, property,
financial and other conditions, prospects and creditworthiness of the Credit
Parties. Except for notices, reports and other documents expressly required to
be furnished to the Lenders by the Administrative Agent hereunder, the Agents
and NCMI shall not have any duty or responsibility to provide any Lender with
any credit or other information concerning the business, operations, assets,
property, financial or other conditions, prospects or creditworthiness of the
Credit Parties which may come into the possession of the Agents, NCMI or any of
their officers, directors, employees, agents, attorneys-in-fact or affiliates.



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         10.7 Indemnification. The Lenders agree to indemnify each Agent in its
capacity as such (to the extent not reimbursed by the Borrower and without
limiting the obligation of the Borrower to do so), ratably according to their
respective Commitments (or if the Commitments have expired or been terminated,
in accordance with the respective principal amounts of outstanding Loans and
Participation Interest of the Lenders), from and against any and all
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements of any kind whatsoever which may at any time
(including without limitation at any time following payment in full of the
Credit Party Obligations) be imposed on, incurred by or asserted against an
Agent in its capacity as such in any way relating to or arising out of this
Credit Agreement or the other Credit Documents or the LOC Documents or any
documents contemplated by or referred to herein or therein or the transactions
contemplated hereby or thereby or any action taken or omitted by an Agent under
or in connection with any of the foregoing; provided that no Lender shall be
liable for the payment of any portion of such liabilities, obligations, losses,
damages, penalties, actions, judgments, suits, costs, expenses or disbursements
resulting from the gross negligence or willful misconduct of an Agent. If any
indemnity furnished to an Agent for any purpose shall, in the opinion of such
Agent, be insufficient or become impaired, such Agent may call for additional
indemnity and cease, or not commence, to do the acts indemnified against until
such additional indemnity is furnished. The agreements in this Section shall
survive the payment of the Credit Party Obligations and all other amounts
payable hereunder and under the other Credit Documents.

         10.8 Agents in Their Individual Capacity. Each Agent and its affiliates
may make loans to, accept deposits from and generally engage in any kind of
business with the Borrower or any other Credit Party as though such Agent were
not an Agent hereunder. With respect to the Loans made and Letters of Credit
issued and all obligations owing to it, an Agent shall have the same rights and
powers under this Credit Agreement as any Lender and may exercise the same as
though they were not an Agent, and the terms "Lender" and "Lenders" shall
include each Agent in its individual capacity.

         10.9 Successor Agent. Any Agent may, at any time, resign upon 20 days
written notice to the Lenders. Upon any such resignation, the Required Lenders
shall, subject to the consent of the Borrower in its sole discretion, have the
right to appoint a successor Agent. If no successor Agent shall have been so
appointed by the Required Lenders, and shall have accepted such appointment,
within 45 days after the notice of resignation, then the retiring Agent shall
select a successor Agent provided such successor is a Lender hereunder or
qualifies as an Eligible Assignee. Upon the acceptance of any appointment as an
Agent hereunder by a successor, such successor Agent shall thereupon succeed to
and become vested with all the rights, powers, privileges and duties of the
retiring Agent, and the retiring Agent shall be discharged from its duties and
obligations as an Agent, as appropriate, under this Credit Agreement and the
other Credit Documents and the provisions of this Section 10.9 shall inure to
its benefit as to any actions taken or omitted to be taken by it while it was an
Agent under this Credit Agreement.




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                                   SECTION 11

                                  MISCELLANEOUS

         11.1 Notices. Except as otherwise expressly provided herein, all
notices and other communications shall have been duly given and shall be
effective (a) when delivered, (b) when transmitted via telecopy (or other
facsimile device) to the number set out below, (c) the Business Day following
the day on which the same has been delivered prepaid to a reputable national
overnight air courier service, or (d) the third Business Day following the day
on which the same is sent by certified or registered mail, postage prepaid, in
each case to the respective parties at the address or telecopy numbers set forth
on Schedule 11.1, or at such other address as such party may specify by written
notice to the other parties hereto.

         11.2 Right of Set-Off. In addition to any rights now or hereafter
granted under applicable law or otherwise, and not by way of limitation of any
such rights, upon the occurrence and during the continuance of an Event of
Default and the commencement of remedies described in Section 9.2, then, to the
extent permitted by applicable law, each Lender is authorized at any time and
from time to time, without presentment, demand, protest or other notice of any
kind (all of which rights being hereby expressly waived), to set-off and to
appropriate and apply any and all deposits (general or special) and any other
indebtedness at any time held or owing by such Lender (including, without
limitation, branches, agencies or Affiliates of such Lender wherever located) to
or for the credit or the account of any Credit Party against obligations and
liabilities of such Credit Party to the Lenders hereunder, under the Notes, or
the other Credit Documents, irrespective of whether the Administrative Agent or
the Lenders shall have made any demand hereunder and although such obligations,
liabilities or claims, or any of them, may be contingent or unmatured, and any
such set-off shall be deemed to have been made immediately upon the occurrence
of an Event of Default even though such charge is made or entered on the books
of such Lender subsequent thereto; provided that promptly following any such
set-off, such Lender will provide written notice thereof to the Borrower.

         11.3     Benefit of Agreement.

                  (a) Generally. This Credit Agreement shall be binding upon and
         inure to the benefit of and be enforceable by the respective successors
         and assigns of the parties hereto; provided that none of the Credit
         Parties may assign and transfer any of its interests (except as
         permitted by Section 8.4 or 8.5) without the prior written consent of
         the Lenders; and provided further that the rights of each Lender to
         transfer, assign or grant participations in its rights and/or
         obligations hereunder shall be limited as set forth below in
         subsections (b) and (c) of this Section 11.3. Notwithstanding the above
         (including anything set forth in subsections (b) and (c) of this
         Section 11.3), nothing herein shall restrict, prevent or prohibit any
         Lender from (A) pledging its Loans hereunder to a Federal Reserve Bank
         in support of borrowings made by such Lender from such Federal Reserve
         Bank, or (B) granting assignments or participations in such Lender's
         Loans and/or Commitments hereunder to its parent company and/or to any
         Affiliate of such Lender (provided that such parent company or
         Affiliate qualifies as an Eligible Assignee) or to any existing Lender;
         provided that, as of the date of such assignment or participation, such
         assignee or participant shall not be entitled


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<PAGE>



         to receive a greater payment under Section 3.13 than the assigning or
         participating Lender would be entitled to receive.

                  (b) Assignments. In addition to the assignments permitted by
         Section 11.3(a), each Lender may, with the prior written consent of the
         Borrower and the Administrative Agent (provided that no consent of the
         Borrower shall be required during the existence and continuation of an
         Event of Default), which consent shall not be unreasonably withheld or
         delayed, assign all or a portion of its rights and obligations
         hereunder pursuant to an assignment agreement substantially in the form
         of Exhibit 11.3 to one or more Eligible Assignees; provided that (i)
         any such assignment shall be in a minimum aggregate amount of
         $10,000,000 of the Commitments and in integral multiples of $1,000,000
         above such amount (or the remaining amount of Commitments held by such
         Lender), (ii) each such assignment shall be of a constant, not varying,
         percentage of all of the assigning Lender's rights and obligations
         under the Commitment being assigned. Any assignment hereunder
         (including, but not limited to, any assignment by a Lender to another
         Lender) shall be effective upon satisfaction of the conditions set
         forth above and delivery to the Administrative Agent of a duly executed
         assignment agreement, in substantially the form of Exhibit 11.3,
         together with a transfer fee of $3,500 payable to the Administrative
         Agent for its own account, (iii) each such assignment made as a result
         of a demand by the Borrower pursuant to Section 11.3(d) shall be
         arranged by the Borrower after consultation with the Agents and shall
         be either an assignment of all of the rights and obligations of the
         assigning Lender under this Credit Agreement or an assignment of a
         portion of such rights and obligations made concurrently with another
         such assignment or other such assignments that together cover all of
         the rights and obligations of the assigning Lender under this Credit
         Agreement or an assignment of a portion of such rights and obligations
         made concurrently with another such assignment or other such
         assignments that together cover all of the rights and obligations of
         the assigning Lender under this Credit Agreement, (iv) no Lender shall
         be obligated to make any such assignment as a result of a demand by the
         Borrower pursuant to Section 11.3(d) unless and until such Lender shall
         have received one or more payments from either the Borrower or one or
         more Eligible Assignees in an aggregate amount at least equal to the
         aggregate outstanding principal amount of the Revolving Loans owing to
         such Lender, together with accrued interest thereon, to the date of
         payment of such principal amount and all other amounts payable to such
         lender under this Credit Agreement and (v) the Borrower shall be
         entitled to withhold its consent if an assignment would result in
         greater payments under Sections 3.9, 3.11, or 3.13. Upon the
         effectiveness of any such assignment, the assignee shall become a
         "Lender" for all purposes of this Credit Agreement and the other Credit
         Documents and, to the extent of such assignment, the assigning Lender
         shall be relieved of its obligations hereunder to the extent of the
         Loans and Commitment components being assigned. Along such lines the
         Borrower agrees that upon notice of any such assignment and surrender
         of the appropriate Note or Notes, it will promptly provide to the
         assigning Lender and to the assignee separate promissory notes in the
         amount of their respective interests substantially in the form of the
         original Note or Notes (but with notation thereon that it is given in
         substitution for and replacement of the original Note or Notes or any
         replacement notes thereof).



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         By executing and delivering an assignment agreement in accordance with
         this Section 11.3(b), the assigning Lender thereunder and the assignee
         thereunder shall be deemed to confirm to and agree with each other and
         the other parties hereto as follows: (i) such assigning Lender warrants
         that it is the legal and beneficial owner of the interest being
         assigned thereby free and clear of any adverse claim and the assignee
         warrants that it is an Eligible Assignee; (ii) except as set forth in
         clause (i) above, such assigning Lender makes no representation or
         warranty and assumes no responsibility with respect to any statements,
         warranties or representations made in or in connection with this Credit
         Agreement, any of the other Credit Documents or any other instrument or
         document furnished pursuant hereto or thereto, or the execution,
         legality, validity, enforceability, genuineness, sufficiency or value
         of this Credit Agreement, any of the other Credit Documents or any
         other instrument or document furnished pursuant hereto or thereto or
         the financial condition of any Credit Party or the performance or
         observance by any Credit Party of any of its obligations under this
         Credit Agreement, any of the other Credit Documents or any other
         instrument or document furnished pursuant hereto or thereto; (iii) such
         assignee represents and warrants that it is legally authorized to enter
         into such assignment agreement; (iv) such assignee confirms that it has
         received a copy of this Credit Agreement, the other Credit Documents
         and such other documents and information as it has deemed appropriate
         to make its own credit analysis and decision to enter into such
         assignment agreement; (v) such assignee will independently and without
         reliance upon the Agents, such assigning Lender or any other Lender,
         and based on such documents and information as it shall deem
         appropriate at the time, continue to make its own credit decisions in
         taking or not taking action under this Credit Agreement and the other
         Credit Documents; (vi) such assignee appoints and authorizes the Agents
         to take such action on its behalf and to exercise such powers under
         this Credit Agreement or any other Credit Document as are delegated to
         the Agents by the terms hereof or thereof, together with such powers as
         are reasonably incidental thereto; and (vii) such assignee agrees that
         it will perform in accordance with their terms all the obligations
         which by the terms of this Credit Agreement and the other Credit
         Documents are required to be performed by it as a Lender.

                  (c) Participations. Each Lender may sell, transfer, grant or
         assign participations in all or any part of such Lender's interests and
         obligations hereunder; provided that (i) such selling Lender shall
         remain a "Lender" for all purposes under this Credit Agreement (such
         selling Lender's obligations under the Credit Documents remaining
         unchanged) and the participant shall not constitute a Lender hereunder,
         (ii) no such participant shall have, or be granted, rights to approve
         any amendment or waiver relating to this Credit Agreement or the other
         Credit Documents except to the extent any such amendment or waiver
         would (A) reduce the principal of or rate of interest on or fees in
         respect of any Loans in which the participant is participating or
         increase any Commitments with respect thereto, (B) postpone the date
         fixed for any payment of principal (including the extension of the
         final maturity of any Loan or the date of any mandatory prepayment),
         interest or fees in which the participant is participating, or (C)
         release all or substantially all of the collateral or guaranties
         (except as expressly provided in the Credit Documents) supporting any
         of the Loans or Commitments in which the participant is participating,
         (iii) sub-participations by the participant (except to an Affiliate,
         parent company or Affiliate of a parent company of the participant)
         shall be prohibited and (iv) any such participations shall be in a
         minimum


                                       80

<PAGE>



         aggregate amount of $10,000,000 of the Commitments and in integral
         multiples of $1,000,000 in excess thereof. In the case of any such
         participation, the participant shall not have any rights under this
         Credit Agreement or the other Credit Documents (the participant's
         rights against the selling Lender in respect of such participation to
         be those set forth in the participation agreement with such Lender
         creating such participation) and all amounts payable by the Borrower
         hereunder shall be determined as if such Lender had not sold such
         participation; provided, however, that such participant shall be
         entitled to receive additional amounts under Sections 3.9, 3.12, 3.13
         and 3.14 to the same extent that the Lender from which such participant
         acquired its participation would be entitled to the benefit of such
         cost protection provisions.

                  (d) Each Lender grants (i) to the Agents the right to purchase
         all (but not less than all) of such Lender's Commitments and Revolving
         Loans owning to it and the Notes held by it and all of its rights and
         obligations hereunder and under the other Credit Documents at a price
         equal to the aggregate amount of outstanding Revolving Loans owed to
         such Lender (together with all accrued and unpaid interest and fees and
         other amounts owing to such Lender), and (ii) to the Borrower the right
         to cause an assignment of all (but not less than all) of such Lender's
         Commitment and Revolving Loans owing to it and the Notes held by it and
         all of its rights and obligations hereunder and under the other Credit
         Documents, which right may be exercised by the Agents or the Borrower,
         as the case may be, if (A) such Lender refuses to execute any
         amendment, waiver or consent which requires the written consent of all
         of the Lenders and to which the Required Lenders, the Agents and the
         Borrower have agreed, (B) such Lender has delivered a notice or
         certificate pursuant to Section 3.9 or 3.11 or if the Borrower in
         connection therewith or for any other reason is required to deduct or
         withhold any tax, levy, impost, charge, assessment or similar item from
         any amount payable to or for such Lender hereunder, (C) the Borrower
         has knowledge or facts, events or circumstances which are reasonably
         likely to entitle such Lender to deliver a certificate pursuant to
         Section 3.9 or 3.11 and such Lender is unwilling or unable to take
         action to eliminate or avoid its delivery of such a certificate, (D)
         any Non-Excluded Taxes have been or are reasonably likely to be imposed
         on such Lender, (E) such Lender is unable or unwilling to complete or
         deliver any form required to be delivered by it pursuant to Section
         3.13, (F) such Lender has received or is reasonably likely to receive a
         notice or written communication as described in Section 3.13(f), (G)
         such Lender shall have become subject to any receivership,
         conservatorship or other insolvency proceeding, (H) the Eurocurrency
         Reserve Percentage with respect to such Lender's Eurocurrency Loans is,
         or would be reasonably likely to become with any incurrence of
         Eurocurrency Loans, greater than zero, or (I) such Lender shall be a
         Defaulting Lender. Each Lender agrees that if the Agents or the
         Borrower, as the case may be, exercises its option hereunder, it shall
         promptly execute and deliver all agreements and documentation necessary
         to effectuate such assignment as set forth in Section 11.3(b).

         11.4 No Waiver; Remedies Cumulative. No failure or delay on the part of
an Agent or any Lender in exercising any right, power or privilege hereunder or
under any other Credit Document and no course of dealing between the Borrower or
any Credit Party and the Agents or any Lender shall operate as a waiver thereof;
nor shall any single or partial exercise of any right, power or privilege
hereunder or under any other Credit Document preclude any other or further
exercise


                                       81

<PAGE>



thereof or the exercise of any other right, power or privilege hereunder or
thereunder. The rights and remedies provided herein are cumulative and not
exclusive of any rights or remedies which the Agents or any Lender would
otherwise have. No notice to or demand on any Credit Party in any case shall
entitle any Credit Party to any other or further notice or demand in similar or
other circumstances or constitute a waiver of the rights of the Agents or the
Lenders to any other or further action in any circumstances without notice or
demand.

         11.5 Payment of Expenses; Indemnification. The Credit Parties agree to:
(a) pay all reasonable out-of-pocket costs and expenses of (i) the Agents and
NationsBanc Capital Markets, Inc. ("NCMI") in connection with (A) the
negotiation, preparation, execution and delivery and administration of this
Credit Agreement and the other Credit Documents and the LOC Documents and the
documents and instruments referred to therein (including, without limitation,
the reasonable fees and expenses of Moore & Van Allen, special counsel to the
Agents and the fees and expenses of counsel for the Agents in connection with
collateral issues), and (B) any amendment, waiver or consent relating hereto and
thereto including, but not limited to, any such amendments, waivers or consents
resulting from or related to any work-out, renegotiation or restructure relating
to the performance by the Credit Parties under this Credit Agreement and (ii)
the Agents and the Lenders in connection with (A) enforcement of the Credit
Documents and the documents and instruments referred to therein, including,
without limitation, in connection with any such enforcement, the reasonable fees
and disbursements of counsel for the Agents and each of the Lenders, and (B) any
bankruptcy or insolvency proceeding of the Borrower or a Material Subsidiary and
(b) indemnify each Agent, NCMI and each Lender, its officers, directors,
employees, representatives and agents from and hold each of them harmless
against any and all losses, liabilities, claims, damages or expenses incurred by
any of them as a result of, or arising out of, or in any way related to, or by
reason of, any investigation, litigation or other proceeding (whether or not any
Agent, NCMI or Lender is a party thereto) related to (i) the entering into
and/or performance of any Credit Document or any LOC Document or the use of
proceeds of any Loans (including other extensions of credit) hereunder or the
consummation of any other transactions contemplated in any Credit Document or
any LOC Document, including, without limitation, the reasonable fees and
disbursements of counsel and settlement costs incurred in connection with any
such investigation, litigation or other proceeding (but excluding any such
losses, liabilities, claims, damages or expenses to the extent incurred by
reason of gross negligence or willful misconduct on the part of the Person to be
indemnified), (ii) any Environmental Claim and (iii) any claims for Non-Excluded
Taxes.

         11.6 Amendments, Waivers and Consents. In order for any amendment,
change, waiver, discharge or termination of this Credit Agreement or any of the
other Credit Documents to be binding on the Lenders and the Credit Parties, such
amendment, change, waiver, discharge or termination must be in writing and
signed by the Required Lenders and the then Credit Parties; provided that to be
binding no such amendment, change, waiver, discharge or termination shall:

                  (a) extend the Revolving Loan Maturity Date without the
         consent of all the Lenders, or postpone or extend the time for any
         payment or prepayment of principal to any Lender without the consent of
         such Lender;



                                       82

<PAGE>



                  (b) reduce the rate (other than as a result of waiving the
         applicability of any post- default increase in interest rates) or
         extend the time of payment of interest on any Loan made by or any fees
         hereunder for the account of any Lender without the consent of such
         Lender;

                  (c) reduce or waive the principal amount of any Loan made by
         any Lender without the consent of such Lender;

                  (d) increase or extend the Commitment of a Lender over the
         amount thereof in effect without the consent of such Lender (it being
         understood and agreed that a waiver of any Default or Event of Default
         or a waiver of any mandatory reduction in the Commitments shall not
         constitute an increase in the Commitment of any Lender);

                  (e) except as otherwise permitted in this Credit Agreement or
         the Collateral Documents, release the Borrower or substantially all of
         the other Credit Parties from their respective obligations under the
         Credit Documents or release all or substantially all of the collateral
         pledged under the Collateral Documents without the consent of all the
         Lenders;

                  (f) amend, modify or waive any provision of this Section or
         Section 3.4(a), 3.4(b)(i), 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13, 3.14,
         9.1(a), 11.2, 11.3 or 11.5 without the consent of all the Lenders;

                  (g) reduce any percentage specified in, or otherwise modify,
         the definition of Required Lenders without the consent of all the
         Lenders; or

                  (h) consent to the assignment or transfer by the Borrower or
         of any of its rights and obligations under (or in respect of) the
         Credit Documents except as permitted under Section 8.4 without the
         consent of all the Lenders.

Notwithstanding the fact that the consent of all the Lenders is required in
certain circumstances as set forth above, (x) each Lender is entitled to vote as
such Lender sees fit on any reorganization plan that affects the Loans or the
Letters of Credit, and each Lender acknowledges that the provisions of Section
1126(c) of the Bankruptcy Code supersedes the unanimous consent provisions set
forth herein and (y) the Required Lenders may consent to allow a Credit Party to
use cash collateral in the context of a bankruptcy or insolvency proceeding.

         11.7 Counterparts. This Credit Agreement may be executed in any number
of counterparts, each of which where so executed and delivered shall be an
original, but all of which shall constitute one and the same instrument.
Delivery of an executed counterpart by telecopy shall be as effective as
delivery of a manually executed counterpart hereto and shall constitute a
representation that an original executed counterpart will be provided. It shall
not be necessary in making proof of this Credit Agreement to produce or account
for more than one such counterpart.

         11.8 Headings. The headings of the sections and subsections hereof are
provided for convenience only and shall not in any way affect the meaning or
construction of any provision of this Credit Agreement.



                                       83

<PAGE>



         11.9 Defaulting Lender. Each Lender understands and agrees that if such
Lender is a Defaulting Lender then notwithstanding the provisions of Section
11.6 it shall not be entitled to vote on any matter requiring the consent of the
Required Lenders or to object to any matter requiring the consent of all the
Lenders; provided, however, that all other benefits and obligations under the
Credit Documents shall apply to such Defaulting Lender.

         11.10 Survival of Indemnification and Representations and Warranties.
All indemnities set forth herein and all representations and warranties made
herein shall survive the execution and delivery of this Credit Agreement, the
making of the Loans, the issuance of the Letters of Credit and the repayment of
the Loans, LOC Obligations and other obligations and the termination of the
Commitments hereunder. No representation or warranty made or deemed made as of
any date pursuant to any Section or subsection of this Credit Agreement or any
other Credit Document, or any other document, certificate or statement delivered
in connection therewith, shall be deemed by reason of this Section 11.10 to have
been made or deemed made as of any other date.

         11.11  Governing Law.    THIS AGREEMENT AND THE OTHER CREDIT DOCUMENTS
AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER AND
THEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

         11.12 Waiver of Jury Trial. EACH OF THE PARTIES TO THIS AGREEMENT
HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING
OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS CREDIT AGREEMENT, ANY OF THE
OTHER CREDIT DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED HEREBY.

         11.13 Time. All references to time herein shall be references to
Eastern Standard Time or Eastern Daylight time, as the case may be, unless
specified otherwise.

         11.14 Severability. If any provision of any of the Credit Documents is
determined to be illegal, invalid or unenforceable, such provision shall be
fully severable and the remaining provisions shall remain in full force and
effect and shall be construed without giving effect to the illegal, invalid or
unenforceable provisions.

         11.15 Entirety. This Credit Agreement together with the other Credit
Documents represent the entire agreement of the parties hereto and thereto, and
supersede all prior agreements and understandings, oral or written, if any,
including any commitment letters or correspondence relating to the Credit
Documents or the transactions contemplated herein and therein.

         11.16 Binding Effect. This Credit Agreement shall become effective at
such time when all of the conditions set forth in Section 5.1 have been
satisfied or waived by the Lenders and it shall have been executed by the
Borrower, the Guarantors and the Agents, and the Agents shall have received
copies hereof (telefaxed or otherwise) which, when taken together, bear the
signatures of each Lender, and thereafter this Credit Agreement shall be binding
upon and inure to the benefit of the Borrower, the Guarantors, the Agents and
each Lender and their respective successors and assigns.


                                       84

<PAGE>



         11.17 Confidentiality. Each Lender agrees that it will use its
reasonable best efforts to keep confidential and to cause any representative
designated under Section 7.11 to keep confidential any non-public information
from time to time supplied to it under any Credit Document; provided, however,
that nothing herein shall prevent the disclosure of any such information to (a)
the extent a Lender in good faith believes such disclosure is required by
Requirement of Law, (b) counsel for a Lender or to its accountants, (c) bank
examiners or auditors or comparable Persons, (d) any affiliate of a Lender, (e)
any other Lender, or any assignee, transferee or participant, or any potential
assignee, transferee or participant, of all or any portion of any Lender's
rights under this Agreement who is notified of the confidential nature of the
information or (f) any other Person in connection with any litigation to which
any one or more of the Lenders is a party; and provided further that no Lender
shall have any obligation under this Section 11.17 to the extent any such
information becomes available on a non-confidential basis from a source other
than a Credit Party or that any information becomes publicly available other
than by a breach of this Section 11.17.



                                       85

<PAGE>



         Each of the parties hereto has caused a counterpart of this Credit
Agreement to be duly executed and delivered as of the date first above written.

BORROWER:
                             COVANCE INC.,
                             a Delaware corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President


GUARANTORS:                  COVANCE CLINICAL AND PERIAPPROVAL
                             SERVICES, INC.
                             a corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President


                             COVANCE PHARMACEUTICAL PACKAGING
                             SERVICES, INC.
                             a corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President


                             COVANCE LABORATORIES INC.
                             a corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President


                             COVANCE RESEARCH PRODUCTS INC.
                             a corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President



<PAGE>



                             COVANCE CENTRAL LABORATORY SERVICES
                             LIMITED PARTNERSHIP
 
                             By CORNING SCICOR, INC., a corporation, its
                             General Partner

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President


                             COVANCE PRECLINICAL CORPORATION
                             a corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President


                             COVANCE CENTRAL LABORATORY SERVICES,INC.
                             a corporation

                             By: /s/ Jeffrey S. Hurwitz
                                 ----------------------
                             Name: Jeffrey S. Hurwitz
                             Title: Senior Vice President



<PAGE>



LENDERS:

                             NATIONSBANK, N.A.,
                             individually in its capacity as a
                             Lender and in its capacity as Administrative Agent

                             By: /s/ Eileen C. Huggins
                                 ---------------------
                             Name: Eileen C. Huggins
                             Title: Vice President


                             WACHOVIA BANK OF GEORGIA, N.A.,
                             individually in its capacity as a Lender and in 
                             its capacity as Syndication Agent

                             By: /s/ Holger Ebert
                                 ----------------
                             Name: Holger Ebert
                             Title: Vice President




<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                              BANK OF MONTREAL


                              By: /s/ Glen Pole
                                  -------------
                              Name: Glen Pole
                              Title: Director




<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                              FUJI BANK LTD.


                              By: /s/ Masanobu Kobayashi
                                  ----------------------
                              Name:  Masanobu Kobayashi
                              Title: Vice President & Manager



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                               MORGAN GUARANTY TRUST COMPANY
                               OF NEW YORK


                               By: /s/ Penelope J.B. Cox
                                  ----------------------
                               Name: Penelope J.B. Cox
                               Title: Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                              THE BANK OF NOVA SCOTIA


                              By:/s/ Stephen Lockhart
                                 -------------------------------
                              Name: Stephen Lockhart
                              Title: Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


               BANQUE PARIBAS


               By: /s/ Duane P. Helkowski         /s/ Ann C. Pifer
                   ----------------------         ----------------
               Name: Duane P. Helkowski           Ann C. Pifer
               Title: Assistant Vice President    Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                               BARCLAYS BANK PLC


                               By: /s/ M.A. Prior
                                  ---------------
                               Name: M.A. Prior
                               Title: Executive Vice President
<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                 THE CHASE MANHATTAN BANK


                                 By: /s/ Thomas F. Conrop, Jr.
                                    --------------------------
                                 Name: Thomas F. Conrop, Jr.
                                 Title: Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


               CREDIT SUISSE


               By: /s/ Christopher J. Eldin            /s/ Thomas G. Murio
                   ------------------------            -------------------
               Name: Christopher J. Eldin              Thomas G. Murio
               Title: Member of Senior Management      Associate



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                  THE DAI-ICHI KANGYO BANK, LTD.


                                  By: /s/ Bertram Tang
                                     -----------------
                                  Name: Bertram Tang
                                  Title: Assistant Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                  FLEET NATIONAL BANK


                                  By: /s/ Dorothy E. Bambach
                                     -----------------------
                                  Name: Dorothy E. Bambach
                                  Title: Senior Vice President
<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                   BANK OF TOKYO-MITSUBISHI TRUST COMPANY


                                   By: /s/ Michael C. Irwin
                                       --------------------
                                   Name: Michael C. Irwin
                                   Title: Vice President
<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                    MELLON BANK, N.A.


                                    By: /s/ Caroline R. Walsh
                                       ----------------------
                                    Name: /s/ Caroline R. Walsh
                                    Title: Assistant Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                     PNC BANK, NATIONAL ASSOCIATION


                                     By: /s/ Michael Nardo
                                         -----------------
                                     Name: Michael Nardo
                                     Title: Vice President



<PAGE>



Signature page to Credit Agreement, dated as of November 26, 1996, among Covance
Inc. as Borrower, certain Subsidiaries of Covance Inc. as Guarantors, the
lenders party thereto, NationsBank, N.A., as Administrative Agent and Wachovia
Bank of Georgia, N.A., as Syndication Agent.


                                     THE SANWA BANK LTD


                                     By:  /s/ Paul Judicke
                                     Name: Paul Judicke
                                     Title: Assistant Vice President



<PAGE>


                                                                Exhibit 2.1(g)
                                                                      to
                                                               Credit Agreement

                           FORM OF REVOLVING LOAN NOTE


                                                                          , 199

FOR VALUE RECEIVED, COVANCE INC., a Delaware corporation (the "Borrower"),
hereby promises to pay to the order of (the "Lender"), at the office of
NationsBank, N.A. (the "Administrative Agent") as set forth in that certain
Credit Agreement dated as of , 1996 among the Borrower, certain of the
Subsidiaries of the Borrower, the Lenders named therein (including the Lender),
NationsBank, N.A., as Administrative Agent, and Wachovia Bank of Georgia, N.A.,
as Syndication Agent (as the same may be amended, modified, extended or restated
from time to time, the "Credit Agreement") or at such other place or places as
the holder of this Revolving Loan Note may designate), the aggregate principal
amount of all advances made by the Lender (in the respective currencies made) as
Revolving Loans (and not otherwise repaid), in lawful money (in the currency in
which the Revolving Loan was provided) and in immediately available funds, on
the dates and in the principal amounts provided in the Credit Agreement, and to
pay interest on the unpaid principal amount of each Revolving Loan made by the
Lender, at such office, in like money and funds, for the period commencing on
the date of each Revolving Loan until each Revolving Loan shall be paid in full,
at the rates per annum and on the dates provided in the Credit Agreement.

         This Note is one of the Revolving Loan Notes referred to in the Credit
Agreement and evidences Revolving Loans made by the Lender thereunder. The
Lender shall be entitled to the benefits of the Credit Agreement. Capitalized
terms used in this Revolving Loan Note have the respective meanings assigned to
them in the Credit Agreement and the terms and conditions of the Credit
Agreement are expressly incorporated herein and made a part hereof.

         The Credit Agreement provides for the acceleration of the maturity of
the Revolving Loans evidenced by this Revolving Loan Note upon the occurrence of
certain events (and for payment of collection costs in connection therewith) and
for prepayments of Revolving Loans upon the terms and conditions specified
therein. In the event this Revolving Loan Note is not paid when due at any
stated or accelerated maturity, the Borrower agrees to pay, in addition to the
principal and interest, all costs of collection, including reasonable attorney
fees.

         Except as permitted by Section 11.3(b) of the Credit Agreement, this
Revolving Loan Note may not be assigned by the Lender to any other Person.

         The date, amount, type, currency, interest rate and duration of
Interest Period (if applicable) of each Revolving Loan made by the Lender to the
Borrower, and each payment made on account of the principal thereof, shall be
recorded by the Administrative Agent on its books; provided that the failure of
the Administrative Agent to make any such recordation shall not affect the
obligations of the Borrower to make a payment when due of any amount owing
hereunder or under this Revolving Loan Note in respect of the Revolving Loans to
be evidenced


<PAGE>


by this Revolving Loan Note, and each such recordation shall be prima facie
evidence of the obligations owing under this Revolving Loan Note absent manifest
error.

         THIS REVOLVING LOAN NOTE SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW
YORK.

         IN WITNESS WHEREOF, the Borrower has caused this Note to be executed as
of the date first above written.



                                            COVANCE INC.


                                            By:_______________________________
                                            Name:_____________________________
                                            Title:____________________________






                                                      Final Draft March 20, 1997








                                THE COVANCE INC.
                          EMPLOYEE STOCK OWNERSHIP PLAN

                       (Effective as of December 31, 1996)



<PAGE>


                                TABLE OF CONTENTS

<TABLE>
<S>               <C>                                                                                           <C>
INTRODUCTION      1

ARTICLE I         DEFINITIONS.....................................................................................2

ARTICLE II        ELIGIBILITY AND PARTICIPATION...................................................................8

2.1               Eligibility.....................................................................................8

2.2               Participation...................................................................................8

2.3               Beneficiary Designation.........................................................................8

2.4               Notification of Individual Account Balance......................................................9

2.5               Diversification of Investments or Distribution for Certain Participants.........................9

ARTICLE III       CONTRIBUTIONS..................................................................................11

3.1               Discretionary Contributions....................................................................11

3.2               Maximum Deductible Contribution................................................................11

3.3               Payment of Contributions to Trustee............................................................11

ARTICLE IV        ALLOCATIONS TO INDIVIDUAL ACCOUNTS.............................................................12

4.1               Individual Accounts............................................................................12

4.2               Allocation of Discretionary Contributions......................................................12

4.3               Allocation of Forfeitures......................................................................12

4.4               Maximum Additions..............................................................................13

4.5               Multiple Plan Participation....................................................................14

ARTICLE V         DISTRIBUTIONS..................................................................................16

5.1               Normal Retirement..............................................................................16

5.2               Disability Retirement..........................................................................16

5.3               Death Before Retirement or Termination of Employment...........................................16

5.4               Death After Retirement or Termination of Employment............................................16

5.5               Termination of Employment......................................................................17

5.6               Method of Payment..............................................................................18

5.7               Benefits to Minors and Incompetents............................................................19

5.8               Payment of Benefits............................................................................19

5.9               Valuation of Accounts..........................................................................21

5.11              Payment to Alternate Payee Under QDRO..........................................................22

                                        i
<PAGE>


ARTICLE VI        TRUST FUND.....................................................................................23

6.1               Contributions..................................................................................23

6.2               Trustee........................................................................................23

6.3               Employer Stock Fund............................................................................23

6.4               Dividends on ESOP Stock Attributable to Exempt Loan............................................23

6.5               Voting and Tender Offer Rights on Employer Stock...............................................24

ARTICLE VII       FIDUCIARIES....................................................................................25

7.1               General........................................................................................25

7.2               Corporation....................................................................................25

7.3               Employer.......................................................................................26

7.4               Trustee........................................................................................26

7.5               Committee......................................................................................26

7.6               Claims for Benefits............................................................................28

7.7               Denial of Benefits - Review Procedure..........................................................28

7.8               Records........................................................................................29

7.9               Missing Persons................................................................................29

ARTICLE VIII      AMENDMENT AND TERMINATION OF THE PLAN..........................................................30

8.1               Amendment of the Plan..........................................................................30

8.2               Termination of the Plan........................................................................30

ARTICLE IX        PROVISIONS RELATIVE TO EMPLOYERS INCLUDED IN PLAN..............................................31

9.1               Method of Participation........................................................................31

9.2               Withdrawal.....................................................................................31

9.3               Adoption of ESOP by Participating Employer.....................................................32

ARTICLE X         TOP-HEAVY PROVISIONS...........................................................................33

10.1              Determination of Top-Heavy.....................................................................33

10.2              Top-Heavy Definitions..........................................................................35

ARTICLE XI        MISCELLANEOUS..................................................................................37

11.1              Governing Law..................................................................................37

11.2              Construction...................................................................................37

11.3              Administration Expenses........................................................................37

11.4              Participant's Rights; Acquittance..............................................................37

11.5              Spendthrift Clause.............................................................................37

11.6              Merger, Consolidation or Transfer..............................................................37

11.7              Mistake of Fact................................................................................38


                                       ii

<PAGE>


11.8              Counterparts...................................................................................38

ARTICLE XII       ADOPTION OF THE PLAN...........................................................................39

SUPPLEMENT A - to the Covance Inc. Employee Stock Ownership Plan - Employee Stock

                    Ownership Plan (ESOP)........................................................................A1

SUPPLEMENT B - Supplemental List of Participating Employees......................................................B1

SUPPLEMENT C - 1996 Domestic and International Allocation Formula................................................C1

                                      iii
</TABLE>

<PAGE>


                                  INTRODUCTION

         This Plan establishes the Plan which shall be generally effective as of
the Distribution Date except as specifically noted otherwise.

         This plan document is intended to be a retirement plan qualified under
Code Section 401(a) and the separately adopted Trust Agreement is intended to
establish the Trust Fund as tax-exempt under Code Section 501(a) as part of the
Plan. This Plan is intended to operate as an "employee stock ownership plan" as
defined in Code Section 4975(e)(7) and related regulations.

         Except as otherwise noted in this Plan document, this Plan shall apply
only to Employees who work for, or continue to work for, the Employer on or
after the Distribution Date.

         As an employee stock ownership plan, the Plan is intended to provide
Employees who qualify as Participants with retirement income by investment of
Plan assets primarily in Employer securities. Plan benefits are related to the
value of Company Stock, other Employer stock, and other assets in which the Plan
is invested. Such benefits and potential stock ownership will encourage
Employees to enhance their total available retirement capital by promoting the
growth of the Employer and the appreciation of its stock value.

         The Employer intends this Plan to meet all of the applicable
requirements of ERISA and the Code, and this Plan shall be interpreted to comply
with ERISA, the Code and all final regulations and formal rulings thereunder.

         The assets of the employee stock ownership plan shall be invested
primarily in common shares of the Employer ("Employer Stock") which qualify as
"employer securities" within the meaning of section 409(1) of the Internal
Revenue Code.


                                       1

<PAGE>


                                    ARTICLE I
                                   DEFINITIONS

1.1 As used herein, unless otherwise required by the context, the following
words and phrases shall have the meanings indicated:

         Active Participant - A Participant shall be deemed an Active
Participant with respect to a Fiscal Quarter if he is employed on the last day
of such Fiscal Quarter.

         Affiliate - An organization which is not an Employer, but which must be
considered together with an Employer under Code Sections 414(b), (c), (m) or
(o).

         Base Compensation - An Employee's annualized salary for the Plan Year;
except that if the Employee is a part-time employee Base Compensation shall be
earnings reported on Form W-2, but excluding amounts for overtime, bonus or
other special compensation.

         Beneficiary - Any person designated by a Participant under Section 2.3
to receive such benefits as may become payable hereunder after the death of such
Participant.

         Board - The Board of Directors of the Corporation.

         Calendar Quarter - January 1 - March 3; April 2 - June 30; July 1 - 
September 30; October 1 - December 31.

         Change in Control - In the event

         (i) any person (including as such term is used in Section 13(d) and
14(d)(2) of the Securities Exchange Act of 1934) becomes the beneficial owner,
directly or indirectly, of the Corporation's securities representing 20% or more
of the combined voting power of the Corporation's then outstanding securities;
or

         (ii) as a result of a proxy contest or contests or other forms of
contested shareholder votes (in each case either individually or in the
aggregate), a majority of the individuals elected to serve on Corporation's
Board of Directors are different then the individuals who served on
Corporation's Board of Directors at any time within the two years prior to such
proxy contest or contests or other forms of contested shareholder votes (in each
case either individually or in the aggregate); or

         (iii) the Corporation's shareholders approve a merger, or consolidation
(where in each case the Corporation is not the survivor thereof), or sale or
disposition of all substantially all of the Corporation's assets or a plan or
partial or complete liquidation; or

         (iv) an offerer (other than the Corporation) purchases shares of the
Corporation's common stock pursuant to a tender or exchange offer to such
shares.


                                       2

<PAGE>

         Code - The Internal Revenue Code of 1986, as amended.

         Committee - The Benefits Administration Committee, as provided for in
Section 8.5.

         Contributions - Payments as provided herein by the Employer to the
Trustee for the purpose of providing the benefits under this Plan.

         Corning - Corning Incorporated, a New York corporation.

         Corporation - Covance Inc. a Delaware corporation, or any successor 
thereto.  The Corporation is the sponsor, named Fiduciary, and plan 
administrator of the Plan for purposes of ERISA as it relates to the employees
of each Employer.

         Discretionary Contributions - Contributions made by an Employer under
Section 3.3. 

         Distribution Date - December 31, 1996, the effective date of the
spinoff of the Employer from Corning through the distribution of stock dividends
in shares of Corning, CCL and the Employer.

         Effective Date - Except as specified otherwise, the Plan is effective
as of the Distribution Date. 

         Eligible Employee - An Employee eligible for participation under
Section 2.1.

         Employee - Any person employed by an Employer. Notwithstanding the
preceding sentence, Employee shall not include (1) independent contractors, (2)
any person who is covered by a collective bargaining agreement where such
agreement provides for a different retirement plan, or where no provision is
made for any retirement plan after good faith bargaining between the Employer
and employee representatives and (3) any person who is excluded from
participation hereunder by the terms of his Employer's adoption of this Plan. No
person who is a leased employee of an Employer within the meaning of Code
Section 414(n), or who receives compensation solely for service as a member of
the Board, shall be eligible to participate in this Plan. 

         Employer - Collectively or individually as the context may indicate,
Covance Inc. (formerly Corning Pharmaceutical Services Inc.); and any other
entity listed in Supplement B which (1) must be considered together with the
Corporation under Code Section 414(b), (c) or (m), (2) has been authorized by
the Board to adopt the Plan and (3) by action of its own board of directors
shall have adopted the Plan, or any successor to one or more of such entities.

         Employer Stock - Any class of the Employer's common stock or the
Employer's preferred stock that is convertible into common stock. Employer Stock
includes ESOP Stock. 


                                       3

<PAGE>

         Employment Commencement Date - The date on which an Employee first
performs an hour of service for an Employer (even if such date is before the
Effective Date with respect to such Employer).

         ERISA - The Employee Retirement Income Security Act of 1974, as
amended.

         ESOP Stock - Employer securities within the meaning of Code section
409(1) that have been acquired with the proceeds of an Exempt Loan. Unallocated
ESOP Stock shall remain in a suspense account described in Section A-5 until
allocated to Participants' ESOP Accounts pursuant to Section A-9. 

         Fiduciary - The Corporation, the Employer, the Trustee, the Committee
and any individual, corporation, firm or other entity which assumes, in
accordance with Article VIII, responsibilities of the Corporation, the Employer,
the Trustee or the Committee respecting management of the Plan or the
disposition of its assets.

         Fund - The Trust Fund.

         Highly Compensated Employee - (a) For any Plan Year, any employee
described in subsection (b) or (c). 

         (b) Any employee who during the immediately preceding Plan Year:

                  (1) was at any time a 5-percent owner (as defined in Code
Section 416(i)(l));

                  (2) received compensation (as defined in Code Section
414(q)(7)) from an Employer or an Affiliate in excess of $50,000 (as adjusted
under Code Section 414(q)(1)); or

                  (3) was at any time an officer and received compensation (as
defined in Code Section 414(q)(7)) from an Employer or an Affiliate greater than
50 percent of the amount in effect under Code Section 415(b)(1)(A) for such
year.

         (c) Any employee who during the current Plan Year:

                  (1) was at any time a 5-percent owner (as defined in Code
Section 416(i)(l));

                  (2) received compensation (as defined in Code Section
414(q)(7)) from an Employer or an Affiliate in excess of $50,000 (as adjusted
under Code Section 414(q)(1)) and was one of the 100 employees receiving the
most compensation (as defined in Code Section 414(q)(7)); or

                  (3) was at any time an officer who received compensation (as
defined in Code Section 414(q)(7)) from an Employer or an Affiliate greater than
50 percent of the 


                                       4

<PAGE>

amount in effect under Code Section 415(b)(1)(A) for such year and was one of
the 100 employees receiving the most compensation (as defined in Code Section
414(q)(7).

         This definition shall be applied in accordance with Code Section 414(q)
and the regulations issued thereunder.

         (d) For purposes of applying the HC Family Member aggregation rules
under this Plan, Highly Compensated Employee shall also include former employees
who separated prior to the Plan Year being tested and who met the definition of
Highly Compensated Employee in either (1) the Plan Year in which they separated
or (2) any Plan Year ending on or after their 55th birthday.

         HC Family Member - With respect to a Highly Compensated Employee who is
either a 5% owner or one of the ten most highly compensated Employees, the
spouse and the lineal ascendants and descendants (and spouses of such ascendants
and descendants) of any such Highly Compensated Employee.

         Individual Account - That portion of Participant's Discretionary
Contributions allocated to such Participant under Section 4.4 and any earnings
or losses on such contribution.

         Limitation Year - The Limitation Year is January 1 - December 31.

         Normal Retirement Age - Age 65.

         Participant - Any Employee or former Employee who has an Individual
Account balance and any Employee who has met the eligibility requirements of
Section 2.1. Participation ends in accordance with Section 2.2.

         Period of Severance - The period of time commencing on an Employee's
Severance from Service Date and ending on his Reemployment Commencement Date.

         Plan - The Covance Inc. Employee Stock Ownership Plan as contained
herein or as duly amended

         Plan Year -The Plan Year is January 1 - December 31. Reemployment

         Commencement Date - The first date on which an Employee again performs
an hour of service following a Period of Severance.

         Section 415 Compensation - An Employee's wages as defined in Code
Section 3401(a) and all other payments of compensation to an Employee by an
Employer (in the course of the Employer's trade or business) for which the
Employer is required to furnish the Employee a written statement under Code
Sections 6041(d) and 6051(a)(3). Section 415 Compensation shall be determined
without regard to any rules that limit the remuneration included in wages based
on the nature or location of the employment or the services performed (such as
the exception for agricultural labor in Code Section


                                       5

<PAGE>

3401(a)(2)). Section 415 Compensation does not include employee pre-tax
contributions to a qualified Plan and salary reduction contributions to a Code
Section 125 cafeteria plan.

         Severance from Service Date - The date on which an Employee quits,
retires, is discharged or dies, provided he does not earn an hour of service for
an Employer within 12 months after such date.

         Testing Compensation - For each Participant, the Section 415
Compensation paid to an Employee by the Employer for his services, excluding
reimbursements or other expense allowances, cash and non-cash fringe benefits
(e.g., employee discounts), moving expenses, deferred compensation and welfare
benefits, plus any employee pre-tax contributions to a qualified defined
contribution plan and salary reduction contributions to a Code Section 125
cafeteria plan. Testing Compensation in excess of $160,000 (or such different
amount as may be applicable under Code Section 401(a)(17)(B)) shall not be taken
into account.

         Total and Permanent Disability - A Participant shall be considered
totally and permanently disabled once the Committee, in its sole discretion,
determines that he has incurred a disability which renders him totally and
permanently unable to satisfactorily perform his usual duties for his Employer
or the duties of such other position which the Employer makes available to him
and for which he is qualified by reason of his training, education or
experience. Such determination shall be made by the Committee based on medical
reports and such other evidence which the Committee determines to be
satisfactory; provided, however, that conclusive evidence that the Participant
is eligible for and is receiving disability benefits under the provisions of the
Federal Social Security Act shall be sufficient to deem the Participant totally
and permanently disabled.

         Trust Agreement - The agreement entered into between the Employer and
the Trustee under Article VII.

         Trust Fund - All funds received by the Trustee together with all
income, profits and increments thereon, and less any expenses or payments made
out of the Trust Fund.

         Trustee - Such individual, individuals, financial institution, or a
combination of them as shall be designated in the Trust Agreement to hold in
trust any assets of the Plan for the purpose of providing benefits under the
Plan, and shall include any successor trustee to the Trustee initially
designated thereunder.

         Valuation Date - The date on which a Participant's Individual Account
is valued pursuant to Section 5.9. Subject to Section 5.9(b), the Valuation Date
shall be a date that 


                                       6

<PAGE>

falls as soon as administratively feasible after a properly-completed written
request for a distribution is received by an authorized representative of the
Committee.

         Year of Vesting Service - (a) As of any date, the aggregate of an
Employee's periods of vesting service, including any vesting service credited
under subsection (b) and excluding any vesting service disregarded under
subsection (c). For purposes of this subsection (a), a period of vesting service
is each period of time required to be recognized under this Plan commencing on
the later of the Effective Date of this Plan, the Employee's Employment
Commencement Date, or any subsequent Reemployment Commencement Date, and ending
on a Severance from Service Date.

                  (b) Vesting service shall also include the following:

                       (1) Periods of employment with an Affiliate (while such
organization is an Affiliate) which would have constituted vesting service had
the Participant been employed by an Employer shall be included as if such
periods had been performed for an Employer; and

                       (2) Periods of employment with an Employer other than as
an Employee, including employment as a leased employee within the meaning of
Code Section 414(n), which would have constituted vesting service had the
Participant been employed as an Employee shall be included as if such periods
had been performed as an Employee.

                  (c) Years of Vesting Service on or after the Effective Date
recognized under the preceding subsections shall not include any vesting service
earned prior to a five-year Period of Severance if, when the Period of Severance
commenced, the Employee Individual Account was not vested under Sections 5.5 or
10.1. 

                  (d) Periods of Employment during an authorized leave of
absence shall be included as vesting service, up to a maximum of three months
during any single consecutive leave or such longer periods approved by the
Corporation in accordance with its policies and procedures.


                                       7

<PAGE>


                                   ARTICLE II
                          ELIGIBILITY AND PARTICIPATION
2.1 Eligibility

         An Employee who has completed an hour of service on the Effective Date
shall be a Participant. Each other Employee shall become a Participant on the
date following the Effective Date on which he completes an hour of service with
an Employer. 

2.2 Participation

         Each person who becomes a Participant shall remain a Participant so
long as he remains an Employee or maintains an Individual Account balance. If a
Participant terminates employment with no balance in his Individual Account, he
shall cease being a Participant upon his termination of employment. In the event
an Employee ceases to be a Participant and is later reemployed as an Employee,
he shall once again become a Participant upon his reemployment date. 

2.3 Beneficiary Designation

         (a) Upon commencing participation, each Participant shall designate a
Beneficiary by filing a properly-completed form with an authorized
representative of the Committee. In the absence of any valid designation of
Beneficiary, the Participant shall be deemed to have designated his spouse as
his Beneficiary, and if the Participant is unmarried upon his death, he shall be
deemed to have designated his estate as his Beneficiary.

         (b) The Beneficiary of a married Participant shall be his spouse unless
the Participant designates someone other than his spouse as his Beneficiary, and
the Participant files with an authorized representative of the Committee his
spouse's written consent to such designation. Such spousal consent shall be on a
form approved by the Committee, shall be irrevocable by the spouse, shall
acknowledge the effect of such designation and shall be witnessed by a Committee
member (or an authorized representative) or a notary public. The spouse may
alternatively execute an irrevocable general consent that does not identify the
designated Beneficiary and which allows the Participant to make future changes
in the Beneficiary designation without spousal consent. Any such general consent
shall satisfy the requirements of Treasury Regulation [sec]1.401(a)-20 
Q&A-31(c).

         (c) If an unmarried Participant later marries, or if a married
Participant later remarries, any prior designation by such Participant of a
Beneficiary other than the 


                                       8

<PAGE>

spouse to whom he is married on his date of death shall be null and void unless
consented to by such spouse in the manner provided in subsection (b).

         (d) The interpretation of the Committee with respect to any Beneficiary
designation, subject to applicable law, shall be binding and conclusive upon all
parties, and no person who claims to be a Beneficiary, or any other person,
shall have the right to question any action of the Committee.

         (e) The rights of any spouse or Beneficiary hereunder shall be subject
to the provisions of any qualified domestic relations order within the meaning
of ERISA Section 206(d)(3).

2.4      Notification of Individual Account Balance

         As of the last day of each Plan Year (or such other earlier period
during the year), the Committee shall notify each Participant of the amount of
his share in the Contributions for the period just completed and the balance of
his Individual Account, including distributions, if any, since the effective
date of the last statement. Such notification shall be provided within a
reasonable period of time following the end of the Plan Year. 

2.5 Diversification of Investments or Distribution for Certain Participants

         For purposes of this Section 2.5, "Qualified Participant" shall mean a
Participant who has completed at least five years of participation in the Plan.

         "Qualified Election Period" shall mean the period of six Plan Years
beginning with the later of (i) the Plan Year in which the Participant first
becomes a Qualified Participant, or (ii) the Plan Year which includes the tenth
anniversary of the Distribution Date; provided that the Qualified Election
Period shall not begin unless and until the fair market value of Employer Stock
allocated to the Participant's ESOP Account is at least $500 as of any Valuation
Date.

         No later than 90 days after the last day of each Plan Year during his
Qualified Election Period, each Qualified Participant shall be permitted to
direct the Plan as to the investment of 100 percent (100%) of an amount equal to
the value of his Individual Account attributable to Employer Stock. The
Participant's direction shall be provided to the Committee in writing and shall
be effective no later than 180 days after the close of the Plan Year to which
the direction applies.

         The Plan shall satisfy the Participant's direction by transferring the
portion of his Account that is covered by the election to another qualified plan
(including the portion of this Plan that does not constitute an ESOP) of the
Employer that accepts the transfer and permits employee-directed investments and
offers the Participant at least three investment 


                                       9

<PAGE>

options (not inconsistent with regulations prescribed by the Secretary of the
Treasury) other than Employer Stock. The transfer shall be made, and the amount
transferred shall be invested in accordance with the Participant's election, no
later than 90 days after the last day of the period during which the election
can be made. If at the time of an election no Employer then maintains a
qualified plan that is eligible to receive the portion of the Participant's
Account that is covered by the election, the Plan shall distribute that portion
to the Qualified Participant within 90 days after the last day of the period
during which the election can be made, subject to the requirements of Section
A-11 concerning put options. This Section shall apply notwithstanding any other
provision of the Plan, other than such provisions as require the consent of the
Participant to a distribution with a present value in excess of $3,500. If the
Participant does not consent to such a distribution, the amount as to which the
election is made shall be retained in the Plan and the diversification
requirement of this Section shall be deemed to have been satisfied.


                                       10

<PAGE>

                                   ARTICLE III

                                  CONTRIBUTIONS

3.1 Discretionary Contributions

         To the extent permitted under the terms of the Plan, the Code and
ERISA, the Corporation shall make a Discretionary Contribution as of the last
day of the first Plan Year for each Participant who was an active Participant
during the Plan Year, which amount shall be allocated in accordance with Section
4.2 As of the last day of each Plan Year thereafter, the Corporation, at the
discretion of the Board, may make a Discretionary Contribution. Such
Discretionary Contribution, if made, shall be expressed as a percentage of Base
Compensation and shall be allocated in accordance with Section 4.2. No
Discretionary Contribution shall be made with respect to any Participant who is
not an Active Participant for the applicable Plan Year. The Employer shall also
contribute sufficient Discretionary Contributions as may be required by Section
10.1(b). Notwithstanding the foregoing, no contribution shall be made and
allocated under Section 4.2 to the extent it would cause the Participant to
exceed the maximum additions under Section 4.4 for the Plan Year. 3.2 Maximum
Deductible Contribution

         In no event shall the Employer be obligated to make a Contribution for
a Plan Year in excess of the maximum amount deductible by it under Code Section
404(a)(3). 3.3 Payment of Contributions to Trustee
         Unless an earlier time for contribution is specified elsewhere in this
Plan, in all events the Employer shall pay to the Trustee its Contributions for
each Plan Year within the time prescribed by law, including extensions of time
for the filing of its federal income tax return for the Employer's taxable year
during which such Plan Year ended.


                                       11

<PAGE>


                                   ARTICLE IV

                       ALLOCATIONS TO INDIVIDUAL ACCOUNTS

4.1 Individual Accounts

         (a) The Committee shall establish and maintain an Individual Account in
the name of each Participant, compromised of Discretionary Contributions and
investment earnings thereon, to which the Committee shall credit all amounts
allocated to each such Participant under this Article IV.

         (b) Separate accounts shall be maintained for all former Employee
Participants who have an interest in the Plan.

         (c) The maintenance of separate accounts shall not require a
segregation of the Trust assets and no Participant shall acquire any right to or
interest in any specific asset of the Trust as a result of the allocations
provided for in the Plan.

4.2 Allocation of Discretionary Contributions

         (a) A Participant's allocable share as determined under subsection (b)
of the Discretionary Contribution shall be credited to the Participant's
Individual Account as of the last day of each Plan Year for which the
Corporation shall make a Discretionary Contribution under Section 3.1 and shall
be invested in Employer Stock.

         (b) Each Participant who is an Active Participant for the Plan Year
with respect to which the Corporation makes a Discretionary Contribution shall
receive an allocation of the Discretionary Contribution. No other Participant
shall receive an allocation. Each Active Participant shall receive an amount
equal to the Discretionary Contribution, multiplied by a fraction where the
numeration is the Participant's Base Compensation and the denominator is the sum
of the Base Compensation of all Active Participants. Notwithstanding the
foregoing, the Corporation may designate that all or any portion of a
Discretionary Contribution shall be allocated only to new Participants during
the Plan Year based on Base Compensation and in accordance with the above
allocation formula. 

4.3 Allocation of Forfeitures

         As of the last day of each Plan Year, any forfeitures arising under
Section 5.5(c) shall be used to the extent necessary to restore a Participant's
Individual Account as provided in Section 5.5(c)(1), and/or shall be allocated
per capita to new Participants during the Plan Year ending December 31, 1997 and
December 31, 1998. Notwithstanding the foregoing, for Plan Years ending December
31, 1999 and 2000, any forfeitures shall be allocated per capita to all Active
Participants.


                                       12

<PAGE>

4.4 Maximum Additions

         (a) Notwithstanding anything herein to the contrary but subject to
subsection (b), the sum of the Discretionary Contributions allocated to a
Participant's Individual Account for any Limitation Year (the "Annual
Additions"), when combined with any annual additions credited to the Participant
for the same period under another qualified defined contribution plan maintained
by the Employer or an Affiliate, shall not exceed the lesser of the following:

                  (1) $30,000 or such larger amount as may be determined under
Code Section 415(c)(1)(A); or

                  (2) 25% of the Participant's total Section 415 Compensation
received from the Employer for such Limitation Year.

         (b) In the event a Participant is covered by more than one defined
contribution plan maintained by the Employer (or an Affiliate), the maximum
Annual Additions to this Plan shall be decreased as determined necessary by the
Employer to insure that the limitations of Code Section 415(c) are not exceeded.

         In the event that corrective adjustments in the Annual Additions to any
Individual Accounts are required due to a reasonable error in estimating a
Participant's compensation that may be made with respect to any Participant
under the annual additions limit of Sections 4.4(a) and (b), the adjustment
shall first be made by reducing the Discretionary Contributions provided under
this Plan, employer contribution under any qualified defined contribution plan
maintained by the Employer, and next any employee pre-tax contributions.

         Any amounts withheld or taken from a Participant's Individual Account
pursuant to the above shall be segregated in the Trust Fund in a separate
account and applied toward the Contribution of the Employer for the next
Limitation Year for the affected Participant, including a special Discretionary
Contribution under section 4.2(b) earmarked exclusively for that Participant,
subject to satisfying any restriction under section 401(a)(y) of the code with
regard to all such special contributions.

         (c) A Participant's annual additions with respect to Employer Stock
allocable to an Exempt Loan shall be determined on the basis of the lesser of
contributions thereto or the value of Employer Stock released from the Suspense
Account and, if no more than one third of any employer matching contributions
which are deductible under Section 404(a)(9) of the Code by reason of their
application to make payments on an Exempt Loan are allocated to Highly
Compensated Employees, a Participant's annual additions shall not include
employer contributions which are deductible under Section 404(a)(9)(B)


                                       13

<PAGE>

of the Code by reason of their applications to the payment of interest on an
Exempt Loan or forfeitures of Employer Stock attributable to an Exempt Loan.

4.5 Multiple Plan Participation

         (a) If a Participant is a participant in a defined benefit plan
maintained by the Employer, the sum of his defined benefit plan fraction
(determined in subsection (c)) and his defined contribution plan fraction
(determined in subsection (b)) for any Limitation Year may not exceed 1.0.

         (b) The term "defined contribution plan fraction" shall mean a
fraction, the numerator of which is the sum of all of the Annual Additions to
the Participant's Individual Account under this Plan as of the close of the
Limitation Year and the denominator of which is the sum of the lesser of the
following amounts determined for such Limitation Year and for each prior
Limitation Year of employment with the Employer:

                  (1) the product of 1.25 multiplied by the dollar limitation in
effect under Section 4.6(a)(1) for such Year; or

                  (2) the product of 1.4 multiplied by an amount determined
under Section 4.6(a)(2) for such Year.

         (c) The term "defined benefit plan fraction" shall mean a fraction the
numerator of which is the Participant's projected annual benefit determined as
of the close of the Limitation Year and the denominator of which is the lesser
of:

                  (1) the product of 1.25 multiplied by the dollar limitation in
effect under Code Section 415(b)(1)(A) for such Limitation Year; or

                  (2) the product of 1.4 multiplied by the amount which may be
taken into account under Code Section 415(b)(1)(B) with respect to each
individual under the Plan for such Limitation Year.

         For purposes of this limitation, all defined benefit plans maintained
by an Employer (or any Affiliates), whether or not terminated, are to be treated
as one defined benefit plan and all defined contribution plans maintained by an
Employer (or any Affiliates), whether or not terminated, are to be treated as
one defined contribution plan. The extent to which the annual benefit under any
defined benefit plans shall be reduced in order to achieve compliance with the
limitations of Code Section 415 shall be determined in such a manner so as to
maximize the aggregate benefits payable to such Participant. If such reduction
is under this Plan, the Committee shall advise affected Participants of any
additional limitation on their annual benefits required by this Section.


                                       14

<PAGE>

         (d) The above limitations in Section 4.4 and this Section 4.5 are
intended to comply with the provisions of Code Section 415 so that the maximum
benefits able to be provided by plans of the Employer shall be exactly equal to
the maximum amounts allowed under Code Section 415. If there is any discrepancy
between the provisions of Section 4.4 or this Section 4.5 and the provisions of
Code Section 415, such discrepancy shall be resolved in such a way as to give
full effect to the provisions of Code Section 415, which provisions are hereby
incorporated by reference.


                                       15

<PAGE>


                                    ARTICLE V

                                  DISTRIBUTIONS

5.1      Normal Retirement

         Upon the retirement of a Participant on or after attaining his Normal
Retirement Age, the value of his Individual Account (as determined under Section
5.9) shall become 100% vested and shall become payable as soon as
administratively feasible following his retirement. The Committee shall
thereupon direct the Trustee to distribute to the retiring Participant such
amount in accordance with Section 5.6. 

5.2 Disability Retirement

         (a) A Participant may retire from the employment of the Employer on the
first day of any month coincident with or next following a determination by the
Committee that the Participant has incurred a Total and Permanent Disability.
Upon the retirement of a Participant under this Section 5.2, the value of his
Individual Account (as determined under Section 5.9) shall become 100% vested
and shall become payable as soon as administratively feasible following his
retirement. The Committee shall thereupon direct the Trustee to distribute to
the retiring Participant such amount in accordance with Section 5.6.

         (b) Notwithstanding anything herein to the contrary, a Participant who
retires in accordance with this Section 5.2 shall (1) have the right to delay
receipt of his disability retirement benefit until the time required by Section
5.8(b), and (2) if deferred benefit commencement is elected, have the right at
any time subsequent to his disability retirement date but prior to the time
required by Section 5.8(b) to request benefit commencement at some earlier date.

5.3 Death Before Retirement or Termination of Employment

         Upon the death of a Participant before retirement or termination of
employment, the value of such Participant's Individual Account (as determined
under Section 5.9) shall become 100% vested and shall become payable as soon as
administratively feasible following his death. Subject to subsection (b), the
Committee shall direct the Trustee to distribute to the deceased Participant's
Beneficiary such amount in accordance with Section 5.6.

5.4 Death After Retirement or Termination of Employment

         Upon the death of a Participant who has terminated employment and who
is not receiving benefit payments in accordance with a form of distribution
under Section 5.6, 


                                       16

<PAGE>

the value of the vested portion of such Participant's Individual Account (as
determined under Section 5.9) shall become payable as soon as administratively
feasible following his death. (For any Participant who is receiving benefit
payments in accordance with a form of distribution under Section 5.6, the
provisions of such form of distribution shall control any payments upon the
death of such Participant.) The Committee shall direct the Trustee to distribute
to the deceased Participant's Beneficiary such amount in accordance with Section
5.6.

5.5 Termination of Employment

         (a) Upon termination of employment for any reason other than retirement
under Section 5.1 or 5.2, or death, a Participant shall be entitled to the value
of the vested portion of his Individual Account (as determined under Section
5.9) and payable at the time set forth in subsection (b). A Participant's
Individual Account shall vest on the earlier of two years and one day from the
date of the initial allocation to the Participant or after earning five Years of
Vesting Service, provided that all amounts shall become fully vested as of
January 1, 2001. Notwithstanding the foregoing, a Participant's Individual
Account shall become fully vested in the event of a Change of Control.

         (b) (1) As soon as administratively feasible following a Participant's
termination of employment, the Committee shall direct the Trustee to distribute
to such Participant the value of the vested portion of his Individual Account
(as determined under Section 5.9). Notwithstanding the preceding sentence, if
the amount to be distributed under this subsection (b) exceeds (or at the time
of any prior distribution exceeded) $3,500, then no distribution shall be made
prior to the Participant attaining his Normal Retirement Age unless he consents
in writing to the making of such distribution. The consent of the Participant
shall be obtained in writing within the 90-day period ending on the date
distribution commences. The Participant shall be given a written notice of the
right to defer any distribution until the Participant's Individual Account
balance is no longer immediately distributable. Such notification shall be
provided no less than seven days and no more than 90 days prior to the date
distribution commences and shall inform the Participant that he has a right to a
period of at least 30 days after receiving the notice to consider the decision
of whether or not to elect a distribution.

                  (2) As soon as administratively feasible following the
attainment of Normal Retirement Age on the part of a Participant who has
previously terminated his employment but the distribution of whose benefit has
not commenced, the Committee 


                                       17

<PAGE>

shall direct the Trustee to distribute to such Participant the value of his
Individual Account (as determined under Section 5.9) in a lump sum payment.

         (c) If a Participant's employment terminates for any reason other than
retirement or death at a time when he is not fully vested in his Individual
Account, then the Committee shall follow the procedure set forth in paragraph
(1) or that set forth in paragraph (2) below, as appropriate:

                  (1) If the vested portion of the Individual Account is
distributed to him at any time before the end of the second Plan Year following
the Plan Year in which his employment terminated, the remaining portion of such
Accounts shall be forfeited as of the date of such termination of employment.
However, if the Participant had no vested interest in his Individual Account at
the time of his termination of employment, the Committee nonetheless shall treat
the Participant as if he had received a distribution on the date his employment
terminated and shall forfeit the Participant's Individual Account on the date
his employment terminated. If the former Participant returns as an Employee
prior to incurring a one-year Period of Severance beginning immediately after
the date of his distribution (or on the date his employment terminated in the
case of a former Participant who had no vested interest in Individual Account on
the date his employment terminated), then his Account, determined as of the date
of the distribution of his vested interest, shall be fully restored to him as of
the end of the Plan Year in which such repayment occurred. In such case, the
Participant's Individual Account shall be restored first out of forfeitures for
such Plan Year and, if such forfeitures are insufficient to restore such
Account, the Employer shall make a special contribution to the extent necessary
so that the Participant's Account is fully restored.

                  (2) If a Participant's vested interest in his Individual
Account is distributed to him under section 5.6 (or is deemed to be distributed
to the Participant), any portion of such Accounts which is not vested shall be
forfeited immediately.

         (d) In the event a Participant who terminated his employment with an
Employer is reemployed as an Employee prior to receiving a distribution of his
Individual Account, he shall not be entitled to a distribution as provided in
this Section 5.5 due to such termination, but shall be entitled to a
distribution as determined herein upon any subsequent termination of employment
for any reason. 

5.6 Method of Payment

                  Benefit payments hereunder shall be made in a lump sum.
Furthermore, distributions to a Participant (or to his Beneficiary if the
Participant dies before distribution of his benefit has commenced), the value of
the vested portion of whose 


                                       18

<PAGE>

Individual Account does not exceed (or at the time of any prior distribution did
not exceed) $3,500, automatically shall be made in a lump sum. A Participant who
is not vested in any portion of his Individual Account shall be deemed to
distributed to the Participant. Payment from investments held in Employer Stock
may be distributed in cash or in stock, at the direction of the Participant.
Payments from other investment accounts shall be made only in cash.

5.7 Benefits to Minors and Incompetents

         (a) In case any person entitled to receive payment under the Plan shall
be a minor, the Committee, in its discretion, may distribute such payment in any
one or more of the following ways:

                  (1) By payment thereof directly to such minor;

                  (2) By application thereof for the benefit of such minor;

                  (3) By payment thereof to either parent of such minor or to
any person who shall be legally qualified and shall be acting as guardian of the
person or the property of such minor, provided the parent or adult person to
whom any amount shall be paid shall have advised the Committee in writing that
he will hold or use such amount for the benefit of such minor.

         (b) In the event a person entitled to receive payment under the Plan is
physically or mentally incapable of personally receiving and giving a valid
receipt for any payment due (unless prior claim therefor shall have been made by
a duly qualified legal representative of such person), such payment in the
discretion of the Committee may be made to the spouse, son, daughter, parent,
brother or sister of the recipient or to any other person who is responsible for
the welfare of such recipient.

         (c) Any payments made under subsections (a) or (b) shall, to the extent
of the payments, fully discharge the obligations of the Committee and the Plan
to any other person making a claim hereunder with respect to such payments.

5.8      Payment of Benefits

         (a) Except as provided in subsection (b), in the event a Participant's
Individual Account shall be due and payable under this Article V and the
Participant has not elected otherwise in accordance with the Plan, any payment
of benefits to the Participant shall begin not later than 60 days after the
close of the Plan Year in which occurs the latest of:

                  (1) the date on which the Participant attains age 65;

                  (2) the 10th anniversary of the date in which the Participant 
commenced participation in the Plan; and


                                       19

<PAGE>

                  (3) termination of employment of the Participant with the 
Employer.

         (b) Notwithstanding subsection (a) above, distribution of a
Participant's benefit shall be made no later than April 1 of the calendar year
following the calendar year during which such Participant attains age 70 1/2,
regardless of whether or not he has terminated employment with the Employer.
Such distribution shall be made over a period not extending beyond the life or
life expectancy of the Participant or the joint lives or life expectancies of
the Participant and a designated Beneficiary. Life expectancies shall be
determined at the time payments commence and shall not thereafter be
recalculated.

         (c) If a Participant dies before distribution of his benefit has
commenced, the Participant's entire benefit shall be distributed within five
years after his death. The preceding sentence shall not apply to any portion of
the Participant's benefit if the following requirements in paragraphs (1) and,
if applicable, (2) are met with respect to such portion:

                  (1) (A) if the portion of the Participant's benefit is payable
to or for the benefit of a designated Beneficiary;

                      (B) such portion will be distributed over a period not 
extending beyond the life expectancy of such Beneficiary at the time payments 
commence; and

                      (C) such distributions begin not later than December 31 of
the calendar year following the calendar year of the Participant's death.

                  (2) If the designated Beneficiary referred to in paragraph
(1)(A) above is the surviving spouse of the Participant, then the date on which
the distributions are required to begin under paragraph (1)(C) shall not be
earlier than December 31 of the calendar year in which the Participant would
have attained age 70 1/2.

                      If the surviving spouse dies before the distributions
to such spouse begin, this Section 5.8(c) (with the exception of paragraph (2)) 
shall be applied as if the surviving spouse were the Participant.

                      This Section 5.8(c) shall not apply if the distribution
of the Participant's benefit has commenced prior to his death and the remaining
portion of the Participant's benefit will be distributed at least as rapidly as
under the method of distribution being used at the date of the Participant's
death.

                      For purposes of this Section 5.8(c), under regulations to
be prescribed by the Secretary of the Treasury, any amount paid to a child shall
be treated as if it had been paid to the surviving spouse upon such child
reaching the age of majority (or other designated event prescribed under such
regulations).


                                       20

<PAGE>

         (d) Distributions under this Article V shall be made in accordance with
regulations issued by the Secretary of the Treasury under Code Section
401(a)(9), including Treasury Regulation [sec]1.401(a)(9)-2, which regulations
shall override any distribution options in this Plan inconsistent with Section
401(a)(9). 

5.9 Valuation of Accounts

         All distributions hereunder shall be based upon the value of the
Participant's Individual Account as determined under this Section 5.9.

         (a) The value of a Participant's Individual Account upon a distribution
hereunder is the product of (A) the per unit value of the Employer Stock Fund
and (B) the number of units of such fund allocated to the Participant's
Individual Account as of such Valuation Date.

         (b) If a Discretionary Contribution is made on behalf of a Participant
after the date on which his Individual Account is valued under subsection (a),
the Participant shall receive an additional distribution equal to the amount of
the Discretionary Contribution and any earnings or losses thereon. Such
additional distribution shall be valued in the same manner as the Participant's
Individual Account was valued under subsection (a), except that the Valuation
Date shall be a date that falls as soon as administratively feasible after the
Discretionary Contribution is made. 

5.10 Direct Rollovers

         (a) Notwithstanding any provision of the Plan to the contrary that
would otherwise limit a distributee's election under this Section, a distributee
may elect, at the time and in the manner prescribed by the Committee, to have
any portion of an eligible rollover distribution paid directly to an eligible
retirement plan specified by the distributee in a direct rollover.

         (b) (1) An "eligible rollover distribution" is any distribution of all
or any portion of the balance to the credit of the distributee, except that an
eligible rollover distribution does not include: any distribution that is one of
a series of substantially equal periodic payments (not less frequently than
annually) made for the life (or life expectancy) of the distributee or the joint
lives (or joint life expectancies) of the distributee and the distributee's
designated beneficiary, or for a specified period of ten years or more; any
distribution to the extent such distribution is required under Section 401(a)(9)
of the Code; and the portion of any distribution that is not includible in gross
income (determined without regard to the exclusion for net unrealized
appreciation with respect to employer securities).


                                       21

<PAGE>

                  (2) An "eligible retirement plan" is an individual retirement
account described in section 408(a) of the Code, an individual retirement
annuity described in section 408(b) of the Code, an annuity plan described in
section 403(a) of the Code, or a qualified defined contribution plan described
in section 401(a) of the Code, that accepts the distributee's eligible rollover
distribution. However, in the case of an eligible rollover distribution to the
surviving spouse, an eligible retirement plan is an individual retirement
account or individual retirement annuity.

                  (3) A "distributee" includes an employee or former employee.
In addition, the employee's or former employee's surviving spouse and the
employee's or former employee's spouse or former spouse who is the alternate
payee under a qualified domestic relations order, as defined in Section 414(p)
of the Code, are distributees with regard to the interest of the spouse or
former spouse.

                  (4) A "direct rollover" is a payment by the Plan to the
eligible retirement plan specified by the distributee.

5.11 Payment to Alternate Payee Under QDRO

         Notwithstanding any other provision of this Plan, once the Committee
determines that a domestic relations order is a qualified domestic relations
order ("QDRO") within the meaning of Section 206(d)(3) of ERISA, unless the QDRO
specifically provides otherwise, the Committee shall direct the Trustee to
distribute, as soon as administratively feasible following the date on which the
Committee determines that the domestic relations order is a QDRO, to the
alternate payee named in the QDRO the benefit provided therein in a lump sum.


                                       22

<PAGE>


                                   ARTICLE VI
                                   TRUST FUND
6.1 Contributions

         Contributions by the Employer as provided for in Article III shall be
paid over to the Trustee. All Contributions by the Employer shall be
irrevocable, except as otherwise provided in this Plan and may be used only for
the exclusive benefit of the Participants and their Beneficiaries. The
Employer's Contribution will be made either in cash or in Employer Stock, or
partially in each. 

6.2 Trustee

         The Corporation will maintain an agreement with the Trustee whereunder
the Trustee will receive, invest and administer as a trust fund Contributions
made under this Plan in accordance with the Trust Agreement.

         Such Trust Agreement is incorporated by reference as a part of the
Plan, and the rights of all persons entitled to benefits hereunder are subject
to the terms of the Trust Agreement. The Trust Agreement specifically provides,
among other things, for the investment and reinvestment of the Fund and the
income thereof, the management of the Fund, the responsibilities and obligations
of the Trustee, removal of the Trustee and appointment of a successor,
accounting by the Trustee and the disbursement of the Fund.

         The Trustee shall, in accordance with the terms of such Trust
Agreement, accept and receive all sums of money paid to it from time to time by
the Employer, and shall hold, invest, reinvest, manage and administer such
moneys and the increment, increase, earnings and income thereof as a trust fund
for the exclusive benefit of the Participants and their Beneficiaries and for
the payment of reasonable expenses of administering the Plan.

6.3 Employer Stock Fund

         The Employer Stock Fund shall be invested in the common stock of the
Employer, provided such stock qualifies as qualifying employer securities within
the meaning of ERISA Section 407(d)(5). The level of Plan assets invested in
such fund may consist of up to 100% of all Plan assets. 

6.4 Dividends on ESOP Stock Attributable to Exempt Loan

         It is anticipated that all dividends payable with respect to shares of
ESOP Stock held in the Suspense Account shall be used for the purpose of
repaying one or more Exempt Loans and will not be allocated to Participants'
Individual Accounts invested in Employer Stock and that all dividends payable
with respect to all other Employer Stock 


                                       23

<PAGE>

held in the Trust Fund shall be added to the Participants' Employer Stock Fund,
subject to Section A-6. Nevertheless, the Committee may, in its sole discretion,
determine for any Plan Year that dividends payable with respect to shares of
ESOP Stock shall, if payable in cash (i) paid currently to Participants or (ii)
used for the purpose of repaying one or more Exempt Loans if such use of said
dividends so applied meets the requirements of Code Section 404(k). Such
discretion herein granted may be exercised by the Committee independently, and
in whole or in part, with respect to the stock held from time to time in one or
more of Employer Stock Funds established under the Trust. Discretion so
exercised for any Plan Year, or for any portion thereof, may be changed by the
Committee at any subsequent time. Cash dividends which are to be paid to the
Participants may be paid directly by the Company or may be paid by the Trustee
within ninety (90) days after the end of the Plan year or receipt by the
Trustee. 

6.5 Voting and Tender Offer Rights on Employer Stock

         Each Participant shall have the right to vote all shares of Employer
Stock held in the Participant's accounts. Each Participant shall also have the
right to direct the Trustee whether to tender such shares of Stock in the event
an offer is made by any person other than the Employer to purchase such shares.
The Committee shall make any such arrangements with the Trustee as may be
appropriate to pass such voting or tender offer rights through to a Participant.
In the event a Participant fails to vote his shares or fails to indicate his
preference with respect to a tender offer, the Trustee shall vote the
Participant's shares or tender his shares in the same proportions as those Plan
Participants who did respond cast their votes or tendered their shares. The
Trustee shall also vote and exercise any tender offer rights with respect to
unallocated ESOP Stock held in a suspense account in the same proportions as
those Plan Participants who responded cast their votes or tendered their shares.
In the event of a Change of Control the Trustee shall exercise its discretion
regarding the voting of unallocated ESOP Stock and any allocated ESOP Stock that
a Participant fails to vote.


                                       24

<PAGE>


                                   ARTICLE VII

                                   FIDUCIARIES

7.1      General

         Each Fiduciary who is allocated specific duties or responsibilities
under the Plan or any Fiduciary who assumes such a position with the Plan shall
discharge his duties solely in the interest of the Participants and
Beneficiaries and for the exclusive purpose of providing such benefits as
stipulated herein to such Participants and Beneficiaries, or of defraying
reasonable expenses of administering the Plan. Each Fiduciary in carrying out
such duties and responsibilities shall act with the care, skill, prudence, and
diligence under the circumstances then prevailing that a prudent person acting
in a like capacity and familiar with such matters would use in exercising such
authority or duties.

         A Fiduciary may serve in more than one Fiduciary capacity and may
employ one or more persons to render advice with regard to his Fiduciary
responsibilities. If the Fiduciary is serving as such without compensation, all
expenses reasonably incurred by such Fiduciary shall be reimbursed by the
Employer or, at the Corporation's direction, from the assets of the Trust.

         A Fiduciary may allocate any of his responsibilities for the operation
and administration of the Plan. In limitation of this right, a Fiduciary may not
allocate any responsibilities as contained herein relating to the management or
control of the Fund except (1) through the employment of an investment manager
as provided in Section 8.3 and in the Trust Agreement relating to the Fund, or
(2) to the extent Participants specify their own Investment Options. 

7.2 Corporation

         The Corporation established and maintains the Plan for the benefit of
its Employees and those of participating Employers and of necessity retains
control of the operation and administration of the Plan. The Corporation is the
Plan administrator within the meaning of ERISA Section 3(16)(A). The Corporation
in accordance with specific provisions of the Plan has, as herein indicated,
delegated certain of these rights and obligations to the Employer, the Trustee
and the Committee and these parties shall be solely responsible for these, and
only these, delegated rights and obligations.


                                       25

<PAGE>

7.3 Employer

         The Employer shall indemnify each member of the Board of Directors, the
Committee, and any of its employees to whom any fiduciary responsibility with
respect to the Plan is allocated or delegated, from and against any and all
liabilities, costs and expenses incurred by such persons as a result of any act
or omission to act in connection with the performance of their fiduciary duties,
responsibilities and obligations under the Plan and under ERISA, except for
liabilities and claims arising from such fiduciary's willful misconduct or gross
negligence. For such purpose, the Employer may obtain, pay for and keep current
a policy or policies of insurance. Where such policy or policies of insurance
are purchased, there shall be no right to indemnification under this Section
8.3, except to the extent of any deductible amount under the policy or policies
or with regard to covered claims in excess of the insured amount. No Plan assets
may be used for any indemnification.

         The Employer shall supply such full and timely information for all
matters relating to the Plan as (a) the Committee, (b) the Trustee, and (c) the
accountant engaged on behalf of the Plan by the Corporation may require for the
effective discharge of their respective duties. 

7.4 Trustee

         The Trustee, in accordance with the Trust Agreement, shall have
authority to manage the Fund, except that (1) the Committee may in its
discretion employ at any time and from time to time an investment manager (as
defined in section 3(38) of ERISA) to direct the Trustee with respect to all or
a designated portion of the assets comprising the Fund, and (2) Participants may
specify their own Investment Options.

         Each Participant in the Plan shall be a "named fiduciary" within the
meaning of section 402 of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA"), to the extent that Employer Stock or shares of Corning or
CCL, whether or not allocated to his accounts, are voted or tendered according
to the Participant's directions. 

7.5 Committee

         The Board shall appoint a Benefits Administration Committee of not less
than three persons to hold office during the pleasure of the Corporation. No
compensation shall be paid members of the Committee from the Fund for service on
such Committee.

         The Committee shall choose from among its members a chairman and a
secretary. Any action of the Committee shall be determined by the vote of a
majority of its members. Either the chairman or the secretary may execute any
certificate or other written direction on behalf of the Committee.


                                       26

<PAGE>

         The Committee shall hold meetings upon such notice, at such place or
places and at such time or times as the Committee may from time to time
determine. Meetings may be called by the chairman or any two members. A majority
of the members of the Committee at the time in office shall constitute a quorum
for the transaction of business. The Committee may also act by written consent
in lieu of a meeting.

         A Committee member may resign at any time by giving written notice of
his resignation to the Corporation at least thirty days in advance, unless the
Corporation shall accept shorter notice. The Corporation shall appoint
replacement Committee members. Any Committee member who was employed by the
Employer when appointed to the Committee shall automatically be deemed to have
resigned from the Committee effective as of the date he ceases to be employed by
the Employer, unless the Corporation shall affirmatively act to keep said member
on the Committee.

         Nothing herein shall prevent a Committee member from being a
Participant, or from acting on Plan matters which affect himself by virtue of
affecting all Participants generally. However, a Committee member shall not act
on any matter which affects himself specially. If application of the preceding
sentence results in there not being a quorum to act on any matter, the
Corporation shall appoint the necessary number of temporary Committee members to
take the action.

         In accordance with the provisions hereof, the Committee has been
delegated certain administrative functions relating to the Plan with all powers
necessary to enable it properly to carry out such duties.

         The Committee shall have discretionary authority to construe the Plan,
and to determine, consistent with the terms of the Plan, all questions that may
arise thereunder relating to (a) the eligibility of individuals to participate
in the Plan, (b) the amount of benefits to which any Participant or Beneficiary
may become entitled hereunder, and (c) any situation not specifically covered by
the provisions of the Plan. The determination of the Committee shall be final
and binding on all interested parties. All disbursements by the Trustee, except
for the ordinary expenses of administration of the Fund or the reimbursement of
reasonable expenses at the direction of the Corporation as provided herein,
shall be made upon, and in accordance with, the written directions of the
Committee. When the Committee is required in the performance of its duties
hereunder to administer or construe, or to reach a determination under any of
the provisions of the Plan, it shall do so on a uniform, equitable and
nondiscriminatory basis. 


                                       27

<PAGE>

7.6 Claims for Benefits

         All claims for benefits under the Plan shall be submitted to the
Committee which shall have the responsibility for determining the eligibility of
any Participant or Beneficiary for benefits. All claims for benefits shall be
made in writing and shall set forth the facts which such Participant or
Beneficiary believes to be sufficient to entitle him to the benefit claimed. The
Committee may adopt forms for the submission of claims for benefits in which
case all claims for benefits shall be filed on such forms. The Committee shall
provide Participants and Beneficiaries with all such forms.

         Upon receipt by the Committee of a claim for benefits, it shall
determine all facts which are necessary to establish the right of an applicant
to benefits under the provisions of the Plan and the amount thereof as herein
provided. The applicant shall be notified in writing by the Committee of its
decision with respect to such applicant's claim within 90 days after the receipt
of written request for benefits.

         If any claim for benefits is denied, the notice shall be written in a
manner calculated to be understood by the applicant and shall include:

         (a) The specific reason or reasons for the denial;

         (b) Specific references to the pertinent Plan provisions on which the
denial is based;

         (c) A description of any additional material or information necessary
for the applicant to perfect the claim and an explanation why such material or
information is necessary; and

         (d) An explanation of the Plan's claim review procedures. If special
circumstances require an extension of time for processing the initial claim, a
written notice of the extension and the reason therefor shall be furnished to
the claimant by the Committee before the end of the initial 90-day period. In no
event shall such extension exceed 180 days after the receipt of the initial
claim for benefits. 

7.7 Denial of Benefits - Review Procedure

         In the event a claim for benefits is denied or if the applicant has had
no response to such claim within 90 days of its submission (in which case the
claim for benefits shall be deemed to have been denied), the applicant or his
duly authorized representative, at the applicant's sole expense, may appeal the
denial by filing a written request for review with the Committee within 60 days
of the receipt of written notice of denial or 60 days from the date such claim
is deemed to be denied. In pursuing such appeal the applicant or his duly
authorized representative may review pertinent Plan documents, and may submit
issues and comments in writing.


                                       28

<PAGE>

         The decision on review shall be made by the Committee within 60 days of
receipt of the request for review, unless special circumstances require an
extension of time for processing, in which case a decision shall be rendered as
soon as possible, but not later than 120 days after receipt of a request for
review. If such an extension of time is required, written notice of the
extension shall be furnished to the claimant before the end of the original 60
day period. The decision on review shall be in writing, shall be written in a
manner calculated to be understood by the claimant, and shall include specific
references to the provisions of the Plan on which such denial is based. If the
decision on review is not furnished within the time specified above, the claim
shall be deemed denied on review. The decision of the Committee upon review will
be final and binding on all parties. 

7.8 Records

         All acts and determinations of the Committee shall be duly recorded by
the secretary thereof and all such records, together with such other documents
as may be necessary in exercising its duties under the Plan shall be preserved
in the custody of such secretary. Such records and documents shall at all times
be open for inspection and for the purpose of making copies by any person
designated by the Corporation. The Committee shall provide such timely
information, resulting from the application of its responsibilities under the
Plan, as needed by the Trustee and the accountant engaged on behalf of the Plan
by the Corporation, for the effective discharge of their respective duties. 

7.9 Missing Persons

         The Committee shall make a reasonable effort to locate all persons
entitled to benefits under the Plan. If such a person cannot be located, the
amount to which such a person otherwise would be entitled shall be retained by
the Trustee and treated in all respects as assets of the Trust, pending
disposition of such amount in accordance with regulations promulgated by the
Secretary of Labor or the Secretary of the Treasury. The Trustee may deposit any
such amounts into an "escheat fund" maintained by such Trustee but not within
the Trust.


                                       29

<PAGE>


                                  ARTICLE VIII

                      AMENDMENT AND TERMINATION OF THE PLAN

8.1 Amendment of the Plan

         The Corporation shall have the right at any time by action of the Board
to amend the Plan in whole or in part, including retroactively to the extent
necessary. The duties, powers and liability of the Trustee hereunder shall not
be increased without its written consent. The amount of benefits which at the
later of the adoption or effective date of such amendment shall have accrued for
any Participant or Beneficiary hereunder shall not be adversely affected
thereby. No such amendment shall have the effect of revesting in the Employer
any part of the principal or income of the Fund. No amendment may eliminate or
reduce any early retirement benefit or subsidy that continues after retirement
or optional form of benefit. Unless expressly provided for in an amendment, it
shall not affect the rights and obligations of any Participant who terminated
employment prior to the effective date of the amendment. 

8.2 Termination of the Plan

         The Corporation expects to continue the Plan indefinitely, but
continuance is not assumed as a contractual obligation and each Employer
reserves the right at any time by action of its board of directors to terminate
the Plan as applicable to itself. If an Employer terminates or partially
terminates the Plan or permanently discontinues its Contributions at any time,
each Participant affected thereby shall be then fully vested in his Individual
Account.

         In the event of termination of the Plan by an Employer, the Committee
shall value the Fund as of the date of termination. That portion of the Fund
applicable to any Employer for which the Plan has not been terminated shall be
unaffected. The Individual Accounts of the Participants and Beneficiaries
affected by the termination, as determined by the Committee, shall continue to
be administered as a part of the Fund or distributed to such Participants or
Beneficiaries pursuant to Section 5.6 as the Committee, in its sole discretion,
shall determine. Any distributions upon plan termination of amounts attributable
to Employee Pre-Tax Contributions shall only be made to the extent permissible
by Code Section 401(k)(10).


                                       30

<PAGE>


                                   ARTICLE IX

                PROVISIONS RELATIVE TO EMPLOYERS INCLUDED IN PLAN

9.1      Method of Participation

         Any organization which is affiliated with the Corporation may with the
consent of the Board adopt the Plan. In order to adopt the Plan, appropriate
action is required by the board of directors (or other governing body) of the
adopting organization and by the Board. Any organization which becomes a party
to the Plan shall thereafter promptly deliver to the Trustee provided for in
Article VII hereof a certified copy of the resolutions or other documents
evidencing its adoption of the Plan or a similar plan and also a written
instrument showing the Board's approval of such organization's becoming a party
to the Plan. 

9.2 Withdrawal

         Any one or more of the Employers included in the Plan may withdraw from
the Plan at any time by giving six months advance notice in writing to the Board
and the Committee (unless a shorter notice shall be agreed to by the Board) of
its or their intention to withdraw. Upon receipt of notice of any such
withdrawal, the Committee shall certify to the Trustee the equitable share of
such withdrawing Employer in the Fund (to be determined by the Committee).

         The Trustee shall thereupon set aside from the Fund then held by it
such securities and other property as it shall, in its sole discretion, deem to
be equal in value to such equitable share. If the Plan is to be terminated with
respect to such Employer, the amount set aside shall be dealt with in accordance
with the provisions of Section 9.2. If the Plan is not to be terminated with
respect to such Employer, the Trustee shall pay such amount to such trustee as
may be designated by such withdrawing Employer, and such securities and other
property shall thereafter be held and invested as a separate trust of the
Employer which has so withdrawn, and shall be used and applied according to the
terms of a new agreement and declaration of trust between the Employer so
withdrawing and the trustee so designated.

         Neither the segregation of the Fund assets upon the withdrawal of an
Employer, nor the execution of any new agreement and declaration of trust
pursuant to any of the provisions of this Section 9.2, shall operate to permit
any part of the corpus or income of the Fund to be used for or diverted to
purposes other than for the exclusive benefit of Participants and Beneficiaries
or to defray reasonable costs of administering the Plan and Trust. 


                                       31

<PAGE>

9.3 Adoption of ESOP by Participating Employer 

Any Employer joining the Plan which is not 100 percent owned by the Employer
must expressly provide in said joiner agreement whether the leveraging
provisions of the ESOP are being adopted by such participating Employer. If the
leveraged ESOP is not so adopted, said participating Employer shall participate
in the ESOP provisions of this Plan as may be modified in said joiner agreement,
but all specific provisions applicable to Exempt Loans and the suspense account
established pursuant to the loan shall not apply. If the ESOP provisions of the
Plan are adopted by such a non-100 percent owned participating Employer, any
Exempt Loan applicable to said participating Employer and its Participants shall
be solely the obligation of said participating Employer, and not the Employer or
any other participating Employer under the Plan, and separate accounting shall
be maintained on behalf of said participating Employer and its Participants with
only Participants employed by said participating Employer entitled to
allocations from the fund maintained for said participating Employer's Exempt
Loan. The foregoing provisions governing separate Exempt Loans and separate
groups of Employees of non-100 percent owned participating Employers shall
similarly apply to an Exempt Loan of the Employer and its 100 percent owned
Participating Employers which join the Plan, and their respective Participants,
but for this purpose a 100 percent owned participating employer may, if so
provided in its joinder agreement, join in the Employer's Exempt Loan and in
such case all participating Employer contributions by the Employer and said
Participating Employers and all accounting for shares released from the suspense
account shall be combined for Participants employed by the Employer and each
such participating Employer.


                                       32

<PAGE>


                                    ARTICLE X

                              TOP-HEAVY PROVISIONS

10.1 Determination of Top-Heavy

         (a) (1) The Plan will be considered a Top-Heavy Plan for any Plan Year
if as of the Determination Date (A) the value of the Individual Accounts of
Participants who are Key Employees as of such Determination Date exceeds 60% of
the value of the Individual Accounts of all Participants determined as of such
Determination Date, excluding former Key Employees (the "60% Test") or (B) the
Plan is part of a Required Aggregation Group which is Top-Heavy. Notwithstanding
the results of the 60% Test, the Plan shall not be considered a Top-Heavy Plan
for any Plan Year in which the Plan is a part of a Required or Permissive
Aggregation Group which is not Top-Heavy.

             (2) For purposes of the 60% Test,

                 (A) all distributions made from Individual Accounts within the
five-year period ending on the Determination Date shall be taken into account;

                 (B) if any Participant is a non-Key Employee with respect to
the Plan for any Plan Year, but such Participant was a Key Employee with respect
to the Plan for any prior Plan Year, the Individual Account of such Participant
shall not be considered; and

                 (C) If a Participant has not performed any service for the
Employer or any Affiliate which maintains the Plan at any time during the
five-year period ending on the Determination Date, the Individual Account of
such Participant shall not be considered.

         (b) Minimum Allocations: Notwithstanding Sections 4.3 and 4.4, for any
Plan Year during which the Plan is a Top-Heavy Plan, the rate of Employer
Matching Contributions and Discretionary Contributions for such Plan Year
allocated to the Individual Accounts of Participants who are non-Key Employees
and who remain employed by the Employer (or any Affiliate) at the end of the
Plan Year (regardless of any such Participant's hours of service or level of
compensation during the Plan Year) shall be not less than the lesser of:

                  (1) three percent (3%) of such non-Key Employee Participant's
Section 415 Compensation; or 

                  (2) the highest aggregate percentage of Section 415 
Compensation at which Employer Matching Contributions, Discretionary 
Contributions, and Employee 


                                       33

<PAGE>

Pre-Tax Contributions are made (or required to be 
made) and allocated under Article IV for any Key Employee for the Plan Year.

         If a Participant is covered by more than one defined contribution plan
on account of his employment with the Employer and/or any Affiliate, the minimum
allocation required by this Section shall be determined by aggregating the
allocations under all such plans.

         (c) (1) Notwithstanding Section 5.5, for any Plan Year in which the 
Plan is a Top-Heavy Plan, a Participant who has earned at least one hour of 
service during such Plan Year shall have a vested interest in those portions of
his Individual Account which are not automatically one hundred percent (100%) 
vested, including allocations made to those portions of the Account in Plan 
Years prior to the Plan becoming Top-Heavy, determined as follows:

- --------------------------------------- ========================================
       Years of Vesting Service                     Vested Interest
- --------------------------------------- ========================================
             less than 2                                  0%
- --------------------------------------- ========================================
              2 or more                                  100%
- --------------------------------------- ========================================

                  (2) If the Plan ceases to be a Top-Heavy Plan, the vesting
rules set forth in Section 5.5 shall again apply except that:

                           (A) any portion of a Participant's Individual Account
that was vested before the Plan ceased to be a Top-Heavy Plan shall remain 
vested, and

                           (B) any Participant with three or more years of 
service shall have the option to continue to have his vested interest in those 
portions of his Individual Account which are not automatically one hundred 
percent (100%) vested determined under this Section 10.1(c).

         (d) Impact on Minimum and Maximum Benefits where Employer Maintains 
Both Defined Benefit and
Defined Contributions Plans

               (1) Impact on Minimum. If the Employer (or any Affiliate)
maintains a defined benefit plan in addition to this defined contribution plan,
both of which are Top-Heavy, then:

                    (A) in the case of non-Key Employee participants covered
only by the defined benefit plan, the minimum benefit under the defined benefit
plan shall be provided; and

                    (B) in the case of non-Key Employee Participants not covered
by the defined benefit plan or covered by both plans, a minimum allocation of
five percent


                                       34

<PAGE>

(5%) of such non-Key Employee Participant's Section 415 Compensation shall be
provided. If a Participant is covered by more than one defined contribution plan
on account of his employment with the Employer and/or any Affiliate, the minimum
allocation required by this Section shall be determined by aggregating the
allocations under all such defined contributions plans.

                  (2) Impact on Maximum.  If the Employer (or any Affiliate)
maintains a defined benefit plan in addition to this defined contribution plan,
both of which are Top-Heavy, Section 4.7 shall be read by substituting the
number "1.00" for the number "1.25" wherever it appears therein, unless (A) the
total aggregate accrued benefits under both such plans for Key Employees does
not exceed 90% of the total aggregate accrued benefits under both such plans for
all Employees (computed in the same manner as the determination in subsection
(a)), and (B)(i) paragraph (1) is read by substituting "seven and one-half
percent (7 1/2%)" for "five percent (5%)," and (ii) in the case of non-Key
Employee participants covered only by the defined benefit plan, a minimum
benefit of three percent (3%) for each year of service (not to exceed 10) shall
be provided.

10.2 Top-Heavy Definitions

         Determination Date - With respect to any Plan Year, the last day of the
preceding Plan Year.

         Key Employee - Any Employee or former Employee who at any time during
the Plan Year containing the Determination Date, or the four preceding Plan
Years, is or was (1) an officer of the Employer having annual Section 415
Compensation for such Plan Year which is in excess of 50 percent of the dollar
limit in effect under Code Section 415(b)(1)(A) for the calendar year in which
such Plan Year ends (but in no event shall the number of officers taken into
account as Key Employees exceed the lesser of (i) 50 or (ii) the greater of 3 or
10% of all employees); (2) an owner of (or considered as owning within the
meaning of Code Section 318) both more than a 1/2 percent interest as well as
one of the ten largest interests in the Employer and having annual Section 415
Compensation greater than the dollar limit in effect under Code Section
415(c)(1)(A) for such Plan Year; (3) a five percent owner of the Employer; or
(4) a one percent owner of the Employer who has annual Section 415 Compensation
of more than $150,000. For purposes of determining five percent and one percent
owners, neither the aggregation rules nor the rules of subsections (b), (c) and
(m) of Code Section 414 apply. Beneficiaries of an Employee acquire the
character of the Employee who performed services for the Employer. Also,
inherited benefits will retain the character of the benefits 


                                       35

<PAGE>

of the Employee who performed services for the Employer. A non-Key Employee is
any Employee who is not a Key Employee, or who is a former Key Employee.

         Permissive Aggregation Group - Each employee pension benefit plan
maintained by the Employer (or any Affiliate) which is considered part of the
Required Aggregation Group, plus one or more other employee pension benefit
plans maintained by the Employer (or any Affiliate) that are not part of the
Required Aggregation Group but that satisfy the requirements of Section
401(a)(4) and Section 410 of the Code when considered together with the Required
Aggregation Group.

         Required Aggregation Group - Each employee pension benefit plan
maintained by the Employer (or any Affiliate), whether or not terminated, in
which a Key Employee participates in the Plan Year containing the Determination
Date or any of the four preceding Plan Years, and each other employee pension
benefit plan maintained by the Employer (or any Affiliate), whether or not
terminated, in which no Key Employee participates but which during the same
period enables any employee pension benefit plan in which a Key Employee
participates to meet the requirements of Section 401(a)(4) or Section 410 of the
Code.


                                       36

<PAGE>


                                   ARTICLE XI

                                  MISCELLANEOUS

11.1 Governing Law

         The Plan shall be construed, regulated and administered according to
the laws of New Jersey except in those areas preempted by the laws of the United
States of America.

11.2 Construction

         The headings and subheadings in the Plan have been inserted for
convenience of reference only and shall not affect the construction of the
provisions hereof. In any necessary construction the masculine shall include the
feminine and the singular the plural, and vice versa.

11.3 Administration Expenses

         The expenses of administering the Fund and the Plan may be paid either
by the Employer or from the Fund, as directed by the Corporation.

11.4 Participant's Rights; Acquittance

         No Participant in the Plan shall acquire any right to be retained in
the Employer's employ by virtue of the Plan, nor, upon his dismissal, or upon
his voluntary termination of employment, shall he have any right or interest in
and to the Fund other than as specifically provided herein. The Employer shall
not be liable for the payment of any benefit provided for herein. All benefits
hereunder shall be payable only from the Fund. 

11.5 Spendthrift Clause

         Except as provided by a qualified domestic relations order within the
meaning of ERISA Section 206(d)(3), none of the benefits, payments, proceeds, or
distributions under this Plan shall be subject to the claim of any creditor of a
Participant or a Beneficiary hereunder or to any legal process by any creditor
of a Participant or Beneficiary. Neither a Participant or Beneficiary shall have
any right to alienate, commute, anticipate, or assign any of the benefits,
payments, proceeds or distributions under this Plan. 

11.6 Merger, Consolidation or Transfer

         In the event of the merger or consolidation of the Plan with another
plan or transfer of assets or liabilities from the Plan to another plan, each
then Participant or Beneficiary shall not, as a result of such event, be
entitled on the day following such merger, consolidation or transfer under the
termination of the Plan provisions to a lesser benefit than the benefit he was
entitled to on the day prior to the merger, consolidation or transfer if the
Plan had then terminated. 


                                       37

<PAGE>

11.7 Mistake of Fact

         Notwithstanding anything herein to the contrary, upon the Employer's
request, a Contribution which was made by a mistake of fact, or conditioned upon
initial qualification of the Plan or upon the deductibility of the Contribution
under Code Section 404, may be returned to the Employer by the Trustee within
one (1) year after the payment of the Contribution, the denial of the
qualification or the disallowance of the deduction (to the extent disallowed),
whichever is later. For purposes of the preceding sentence, all contributions to
the Plan made before receipt of a favorable determination letter on
qualification from the Internal Revenue Service shall be conditioned on the
Plan's initial qualification, and all contributions, whenever made, shall be
conditioned on their deductibility under Code Section 404. 

11.8 Counterparts

         The Plan and the Trust Agreement may be executed in any number of
counterparts, each of which shall constitute but one and the same instrument and
may be sufficiently evidenced by any one counterpart.


                                       38

<PAGE>


                                   ARTICLE XII

                              ADOPTION OF THE PLAN

         Anything herein to the contrary notwithstanding, this Plan is adopted
and maintained under the condition that it is qualified by the Internal Revenue
Service under Code Section 401(a) and that the Trust hereunder is exempt under
Code Section 501(a).

         As evidence of its adoption of the Plan, Covance Inc. has caused this
instrument to be signed by its authorized officer this ___ day of __________,
199__, effective as the _______ day of _____________, 199____.except as
otherwise provided herein.


Covance Inc. hereby signifies its adoption of this Plan.


ATTEST:                     COVANCE INC.
                            (f/k/a Corning Pharmaceutical Services Inc.


___________________________ By:___________________________________(SEAL)
                            (Title)


                            Date:_________________________________


Covance Preclinical Corporation Inc. hereby signifies its adoption of this Plan.


ATTEST:                     COVANCE PRECLINICAL CORPORATION
                            (f/k/a Hazleton Corporation)


___________________________ By:__________________________________(SEAL)
                              (Title)


                                       39

<PAGE>


         Covance Clinical and Periapproval Services Inc. hereby signifies its
adoption of this Plan.


ATTEST:                     COVANCE CLINICAL AND PERIAPPROVAL SERVICES INC.
                            (f/k/a Corning Besselaar, Inc.)


___________________________ By:_______________________________________(SEAL)
                               (Title)

                               ------------------------------------------------
                              (Date)

         Covance Clinical Research Unit Inc., a wholly-owned subsidiary of
Covance Clinical and Periapproval Services Inc., hereby signifies its adoption
of this Plan.

ATTEST:                   COVANCE CLINICAL RESEARCH UNIT INC.
                          (f/k/a Corning Besselaar Clinical Research Unit, Inc.)


___________________________ By:_______________________________________(SEAL)
Secretary                     (Title)

                               ------------------------------------------------
                               (Date)


         Covance Periapproval Services Inc., a wholly-owned subsidiary of
Covance Clinical and Periapproval Services Inc., hereby signifies its adoption
of this Plan.

ATTEST:                     COVANCE PERIAPPROVAL SERVICES INC.
                            (f/k/a Corning Pact, Inc.)


___________________________ By:_______________________________________(SEAL)
                               (Title)

                               ------------------------------------------------
                               (Date)

         Covance Laboratories Inc., a wholly-owned subsidiary of Covance
Preclinical Corporation, hereby signifies its adoption of this Plan.


                                       40

<PAGE>


ATTEST:                     COVANCE LABORATORIES INC.
                            (f/k/a Corning Hazleton Inc.)


___________________________ By:_______________________________________(SEAL)
                              (Title)

                               ________________________________________________
                              (Date)


         Covance Research Products Inc., a wholly-owned subsidiary of Covance
Preclinical Corporation, hereby signifies its adoption of this Plan.


ATTEST:                     COVANCE RESEARCH PRODUCTS INC.
                           (f/k/a HRP, Inc.)


___________________________ By:_______________________________________(SEAL)
                               (Title)

                                ________________________________________________
                               (Date)


         Covance Pharmaceutical Packaging Services Inc. hereby signifies its
adoption of this Plan.




ATTEST:                    COVANCE PHARMACEUTICAL PACKAGING SERVICES INC.
                          (f/k/a Corning National Packaging, Inc.)


___________________________  By:_______________________________________(SEAL)
                               (Title)

                                ________________________________________________
                               (Date)

<PAGE>

Covance Central Laboratory Services Inc. hereby signifies its adoption of this
Plan.


ATTEST:                               COVANCE CENTRAL LABORATORY SERVICES INC.
                                            (f/k/a Corning Scicor, Inc.)


___________________________    By:_______________________________________(SEAL)
                                 (Title)

                                  ______________________________________________
                                 (Date)


       Covance Health Economics and Outcome Services Inc. hereby signifies its
adoption of this Plan.


ATTEST:           COVANCE HEALTH ECONOMICS AND OUTCOME SERVICES INC.
                           (f/k/a Corning HTA Inc.)


___________________________    By:_______________________________________(SEAL)
                                 (Title)

                                  ______________________________________________
                                 (Date)



         Covance Biotechnology Services Inc., hereby signifies its adoption of
this Plan.


ATTEST:                             COVANCE BIOTECHNOLOGY SERVICES INC.



___________________________    By:_______________________________________(SEAL)
                                 (Title)

                                  ______________________________________________
                                 (Date)

<PAGE>

       Covance Central Laboratory Limited Partnership (d/b/a Covance Central
Laboratory Services Inc. f/k/a Corning SciCor Limited Partnership), hereby
signifies its adoption of this Plan.


ATTEST:                    COVANCE CENTRAL LABORATORY LIMITED PARTNERSHIP
                           (d/b/a Covance Central Laboratory Services Inc.
                           f/k/a Corning SciCor Limited Partnership)



___________________________    By:_______________________________________(SEAL)
Secretary                        (Title)

                                  ______________________________________________
                              (Date)

<PAGE>

                                  Supplement A
                                       TO
                                COVANCE INC. INC.
                      EMPLOYEE STOCK OWNERSHIP PLAN (ESOP)

A-1 Purpose. The purpose of this Supplement A to the Plan is to set forth the
terms of the Plan as applied to the portion of the ESOP attributable to Exempt
Loans as described in subsection A-4.

A-2 Effective Date. The effective date of this Supplement A is the Effective
Date.].

A-3 Participation. Each Participant in the Plan on the Effective Date of this
Supplement A shall immediately become a Participant in this Supplement A. Every
other person who thereafter becomes a Participant in the Plan shall at the same
time become a Participant in this Supplement A.

A-4 Exempt Loan. Any loan to the Plan or Trust not prohibited by section 4975(c)
of the Code, including a loan which meets the requirements set forth in section
4975(d)(3) of the Code and the regulations promulgated thereunder, the proceeds
of which are used to finance the acquisition of ESOP Stock or to refinance such
a loan. An Exempt Loan shall be for a specific term, shall bear a reasonable
rate of interest and shall not be payable on demand except in the event of
default. An Exempt Loan may be secured by a pledge of the financed shares so
acquired (or acquired with the proceeds of a prior Exempt Loan which is being
refinanced). No other Trust Fund assets may be pledged as collateral for an
Exempt Loan, and no lender shall have recourse against Trust Fund assets other
than any financed shares remaining subject to pledge. If the lender is a party
in interest (under ERISA), the Exempt Loan must provide for a transfer of Trust
Fund assets on default only upon and to the extent of the failure of the Trust
to meet the payment schedule of the Exempt Loan. Any pledge of financed shares
must provide for the release of the shares so pledged as payments on the Exempt
Loan are made by the Trustee and such financed shares are allocated to
Participants' accounts. Payments of principal on any Exempt Loan shall be made
by the Trustee (as directed by the Committee) only from Employer contributions
paid in cash under the Plan to enable the

                                       A1
<PAGE>

Trust to repay such Exempt Loan, from earnings attributable to such Employer
contributions and from any cash dividends received by the Trust on such financed
shares or dividends on such other shares of Employer Stock as is permitted under
Code section 404(k).

A-5 Investment of Exempt Loan Proceeds. The Employer may direct the Trustee to
enter into one or more Exempt Loans to finance the acquisition of ESOP Stock.
Proceeds from an Exempt Loan may be used to acquire ESOP Stock from the
Employer's shareholders or directly from the Employer. If such shares are
purchased from the Employer, no commission may be charged with respect thereto
and the sale price shall not be more than the fair market value thereof, defined
for this purpose with respect to the Employer's common stock to be said common
stock's New York Stock Exchange closing price on the first business day
immediately preceding the date of sale. There shall be no limit on the amount of
stock of the Employer which may be held at any one time by the Trustee in the
Trust Fund regardless of the percentage which such stock so held bears to the
assets of the Trust Fund or to the outstanding shares of stock of the Employer
or for any other reason.

Notwithstanding any other provision of the Plan, all proceeds of an Exempt Loan
shall be used, within a reasonable time after receipt by the Trust Fund, for the
following purposes:

         (a)      To acquire ESOP Stock;
         (b)      To repay the same Exempt Loan; or
         (c)      To repay any previous Exempt Loan.

ESOP Stock acquired by the Trust Fund through an Exempt Loan shall be initially
maintained in a Suspense Account and shall thereafter be released from suspense
and allocated to Participants' ESOP Accounts as hereinafter provided.

A-6 Supplement A Cash Equivalents Fund. All cash dividends on Employer Stock
held in a Suspense Account which are not allocated to Participants' accounts or,
in the case of allocated shares, which the Employer directs are to be used to
make payments on Exempt Loans shall be credited to the Supplement A Cash
Equivalents Fund pending their

                                       A2
<PAGE>


     application to Exempt Loan payments. Except as provided under Section 7.5,
     all such dividends and all earnings of the Supplement A Cash Equivalents
     Fund shall be used to make principal payments on outstanding Exempt Loans
     to the extent then due. In the event that the amount of such dividends and
     earnings exceeds the amount of principal payable on that date, the excess
     shall be applied until exhausted to interest payable on that date, and
     principal and interest payments due thereafter. Notwithstanding the
     preceding sentences of Section A-6, in lieu of making payments on
     outstanding Exempt Loans, the Committee may direct that all or any amount
     of cash dividends received with respect to Employer Stock allocated to
     participants' accounts shall be credited proportionately to such
     Participants' Accounts pending investment in the Employer Stock Fund. Any
     amount that is applied to make a payment on an outstanding Exempt Loan
     after the last day of a plan year (the "prior plan year"), but on or before
     the due date (including extensions thereof) for the filing of the federal
     income tax return of the Employer for the tax year in which the last day of
     such prior plan year occurs, may be designated by the employers as a
     payment with respect to such prior plan year.

A-7 Coordination with Employer Contributions. For each Plan Year the Employer
shall make contributions under this Section A-7 which, after taking into account
the use of dividends and earnings in accordance with Section A-6, are sufficient
to meet all scheduled payments of principal and interest on outstanding Exempt
Loans. Employer contributions under Section 3.3 (discretionary) shall be applied
against payments on any Exempt Loan to the extent the Committee in its sole
discretion shall determine and ESOP Stock shall then be released. An Employer's
obligations to contribute under Section 3.3 shall be reduced for such month by
the fair market value as of the date of release of the ESOP Stock so released or
otherwise allocated as below provided. To the extent said fair market value is
less than said Employer's obligations under Section 3.3 for any such month, the
Employer shall make further contributions to the Trust Fund to fully meet said
obligations. For each Plan Year, if for a calendar month the fair market value
as of the date of release of the shares so released is in excess of the
Employer's obligations to contribute under Section 3.3 for such month, the
shares released for said month representing the excess ("excess shares") shall
continue to be held by the Trustee and shall thereafter be allocated to the
Participants' Individual Accounts in the following manner: first, if in a
succeeding calendar month within said Plan Year, the fair market value of the
shares so released for said month are less than the Employer's obligations to

                                       A3
<PAGE>

contribute under Section 3.3 for said month, then "excess shares" remaining
unallocated for any prior calendar month in said Plan Year shall be allocated to
the Participants' Individual Accounts to the extent that said Employer
obligations exceed the value of the released shares, and for this purpose said
"excess shares" to be so allocated shall be valued at the same value as the
value of the shares released for said month; and second, if as of the last day
of the Plan Year there remain "excess shares" which have not been allocated to
Participants' Individual Accounts as aforesaid, said "excess shares" shall be
allocated as of the last day of the Plan Year to the Participants' Individual
Accounts, as the Committee may determine in its sole discretion on a
year-to-year basis, in direct proportion to the value (determined as of the date
allocated to the Participants' Individual Accounts) of those shares released and
allocated to the Fund so determined by the Committee, together with all other
Employer contributions to Participants' Individual Accounts for said Plan Year.
In addition to the foregoing contributions, in any Plan Year, the Employers may
make supplemental contributions to be used by the Trustee to prepay any Exempt
loan, to pay expenses of the Plan and any related trust and to satisfy the
dividend requirements for that year with respect to Employer Stock allocated to
Participants' Individual Accounts. All Employer Discretionary Contributions
shall be used to make payments on Exempt Loans to the extent required to meet
any scheduled payments of principal and interest after taking into account the
use of dividends and earnings in accordance with Section A-6.

A-8 Release of Employer Stock From Suspense Account. As of the last day of each
Plan Year, of each calendar quarter in the case of the Employer Stock allocable
for the year as dividend replacements under paragraph A-9(a), or of such other
period provided under the terms of an Exempt Loan, throughout the duration of an
Exempt Loan, a portion of the Employer Stock acquired with the proceeds of such
Exempt Loan shall be withdrawn from the Suspense Account and allocated to
eligible Participants' Individual Accounts in accordance with the provisions of
Section A-9.

          (a) Subject to the provisions of paragraph (b) below, the number of
          shares of Employer Stock which shall be released from the Suspense
          Account for any plan year (calculated separately with respect to each
          Exempt Loan) shall be equal to the product of:

                                       A4

<PAGE>

          (i) the number of shares of Employer Stock acquired with the proceeds
          of the Exempt Loan

                                  Multiplied by

          (ii) a fraction, the numerator of which is the amount of principal and
          interest paid on that loan for that Plan Year and the denominator of
          which is the amount of principal and interest paid or payable on that
          loan for that Plan Year and for all future years.

          For purposes of determining the fraction in (ii), if the interest rate
          under the Exempt Loan is variable, the interest rate to be paid in
          future months shall be assumed to be equal to the interest rate
          applicable as of the applicable month.

     (b)  Notwithstanding the provisions of paragraph (a) above, if provided by
          the terms of an Exempt Loan or directed by the Committee prior to the
          first payment of interest on any Exempt Loan, the number of shares of
          Employer Stock attributable to such Exempt Loan which are withdrawn
          from the Suspense Account for any Plan Year shall be proportionate to
          principal payments only, provided that:

          (i)  such withdrawal is consistent with the provisions of the Exempt
               Loan with respect to the release of Employer Stock as collateral,
               if any, for such loan;

          (ii) the Exempt Loan provides for annual payments of principal and
               interest at a cumulative rate that is not less rapid at any time
               than level annual payments of such amounts for ten years;

         (iii) interest is disregarded for purposes of determining such release
               only to the extent that it would be determined to be interest
               under standard loan amortization tables; and
                                       A5
<PAGE>

          (iv) the term of the ESOP Loan, together with any renewal, extension
               or refinancing thereof, does not exceed ten years.

     (c) Notwithstanding the foregoing, in the event such Exempt Loan shall be
         repaid with the proceeds of a subsequent Exempt Loan (the "Substitute
         Loan"), such repayment shall not operate to release all such ESOP Stock
         in the suspense account, but, rather, such release shall be effected
         pursuant to the foregoing provisions of this Section on the basis of
         payments of principal and interest on such Substitute Loan.

     (d) If at any time there is more than one Exempt Loan outstanding, then
         separate Suspense Accounts may be established for each such Loan. Each
         Exempt Loan for which a separate Suspense Account is maintained may be
         treated separately for purposes of the provisions governing the release
         of ESOP Stock from suspense under this Section and for purposes o the
         provisions governing the application of Employer contributions to repay
         an Exempt Loan.

A-9 Allocation and Crediting of Employer Stock to Individual Accounts and
Application to Plan Limitations. Employer Stock released from the Suspense
Account during any Plan Year shall be allocated and credited as follows:

     (a) To the extent that dividends on Employer Stock previously allocated to
         the Individual Account of a Participant have been used to make payments
         on an Exempt Loan, such account shall be credited with Employer Stock
         with a fair market value determined as of the last day of the month
         preceding the month of the dividend payment date equal to the amount of
         such dividend.

     (b) As of each calendar month, any Employer Stock released from the
         Suspense Account during the Plan Year ending on that date and not
         credited in accordance with paragraph (a) shall be credited to the
         Individual Accounts of eligible Participants pursuant to Section 4.23,
         in order to satisfy the obligation under Section 3.13.

                                       A6
<PAGE>

     (c) It is intended that the provisions of this Supplement A shall be
         applied and construed in a manner consistent with the requirements and
         provisions of Treasury Regulations [section] 54.4975-7(b) (8), and any
         successor regulation thereto. The number of shares allocable to a
         Participant's Individual Account shall be the number of shares which
         bears the same ratio to the total shares released for such month and
         allocable to the contribution made by or on behalf of such Participant
         by his participating Employer under Section 3.1 for such month bears to
         the total Employer contributions under Section 3.1 made on behalf of
         all such Participants for such month, provided, however, that the fair
         market value of the shares so allocated as of the date of such
         allocation shall not exceed the Employer's obligation to contribute
         under such Section on behalf of such Participant for such month, and
         any shares in excess of said participating Employer obligations
         ("excess shares") for all Participants are to be then allocated as
         described above in Section A-7.

     (d) Notwithstanding the foregoing provisions of this Section, if more than
         one-third of the total allocations to Participants' accounts with
         respect to a Plan Year would be allocated in the aggregate to the
         accounts of Highly Compensated Employees and attributable to the
         Employer Matching Contribution allocated to Employer Stock, then the
         allocations to the accounts of Highly Compensated Employees shall be
         reduced, pro rata, in an amount sufficient to reduced the amounts
         allocated to the accounts of such Participants to an amount not in
         excess of one-third of the total allocations to Participants' accounts
         with respect to such Plan Year and any shares of Employer Stock which
         are prevented from being allocated due to said restriction shall be
         allocated as though Highly Compensated Employees did not participate in
         the Plan.

A-10 Diversification Election By Participants. A Qualified Participant is
eligible to elect a diversification of Employer Stock under the conditions
specified in Section 2.6.


                                       A7
<PAGE>

A-11 Put Option. Employer Stock acquired with the proceeds of an Exempt Loan
must be subject to a put option, if at the time of its distribution it is either
subject to a trading limitation, or is not publicly traded. For purposes of this
paragraph (b), a "trading limitation" on a security is a restriction under any
Federal or state securities law, any regulation thereunder, or an agreement, not
prohibited by Treasury regulations Section 54.4975-7(b) affecting the security
so as to make the security not as freely tradable as one not subject to such a
restriction. The put option must be exercisable only by a Participant, a
Beneficiary or by any donee of the Participant or by a person to whom the
security passes by reason of a Participant's death. The put option must permit a
Participant to put the security to the Corporation, and it may grant the trust
an option to assume the rights and obligations of the Corporation at the time
that the put option is exercised, but under no circumstances may the put option
bind the Trust. If it is known at the time an Exempt Loan is made that Federal
or state law will be violated by the Corporation's honoring such a put option,
the put option must permit the security to be put, in a manner consistent with
such law, to a third party (for example but without limitation, to an Affiliate
or a shareholder other than the Trust) that has substantial net worth at the
time the Exempt Loan is made and whose net worth is reasonably expected to
remain substantial. A put option must be exercisable at any time during a period
or periods which include at least (A) sixty (60) days beginning on the date the
security subject to the put option is distributed by the Trustee and (B) sixty
(60) days in the next following Plan Year, in accordance with regulations issued
pursuant to Section 409 of the Code. In the case of a security that is publicly
traded without restriction when distributed, but ceases to be so traded within
the put option period(s) set forth above, the Corporation must notify each
security holder in writing on or before the tenth (10th) day after the date the
security ceases to be so traded that during the remainder of such period(s) the
security is subject to put option. The number of days between such tenth (10th)
day and the date on which notice is actually given, if later than the tenth
(10th) days, must be added to the duration of the put option. The notice must
inform distributees of the terms of the put options that they are to hold. The
price at which a put option must be exercisable is the value of the security, as
determined under Treasury Regulations Section 54.4975-11(d)(5). The provisions
for payment under a put option must provide that the Corporation, or the Trust,
if the Plan so elects, shall repurchase the Employer Securities as follows:

                                       A8
<PAGE>

         (A)    If the distribution constitutes a total distribution within the
                meaning of Section 409(h)(5) of the Code, payment of the fair
                market value of the repurchased Employer Securities shall be
                made in five (5) substantially equal annual payments, of which
                the first shall be paid not later than thirty (30) days after
                the Participant exercises the put option. The purchaser will pay
                a reasonable rate of interest and provide adequate security on
                amounts not paid after thirty (30) days;

         (B)    If the distribution does not constitute a total distribution,
                the purchaser shall pay the Participant an amount equal to the
                fair market value of the Employer Stock repurchased no later
                than thirty (30) days after the Participant exercises the put
                option.


                                       A9
<PAGE>

                                SUPPLEMENT B
                                       TO
              THE COVANCE INC. EMPLOYEE STOCK OWNERSHIP PLAN (ESOP)

                  SUPPLEMENTAL LIST OF PARTICIPATING EMPLOYEES

<TABLE>
<CAPTION>

<S>                                                            <C>    
Participating Employer                                         Formerly Known As
Covance Inc. (Parent)                                          Corning Pharmaceutical Services Inc.
Covance Clinical and Periapproval Services Inc.                Corning Besselaar Inc.
         Covance Clinical Research Unit Inc.                   Corning Besselaar Clinical Research Unit Inc.
         Covance Periapproval Services Inc.                    Corning Pact Inc.
Covance Preclinical Corporation                                Hazleton Corporation
         Covance Laboratories Inc.                             Corning Hazleton Inc.
         Covance Research Products Inc.                        HRP Inc.

Covance Central Laboratory Services Inc.                       Corning SciCor Inc.
         Covance Central Laboratory Limited Partnership (dba   Corning SciCor Limited Partnership
         Covance Central Laboratory Services Inc.)
Covance Pharmaceutical Packaging Services Inc.                 Corning National Packaging Inc.
Covance Health Economics and Outcome Services Inc.             Corning HTA Inc.
Covance Biotechnology Services Inc.                            Corning Bio Inc.

</TABLE>



<PAGE>
                                  SUPPLEMENT C
                                       TO
                 THE COVANCE INC. EMPLOYEE STOCK OWNERSHIP PLAN

               1996 DOMESTIC AND INTERNATIONAL ALLOCATION FORMULA

       This document describes the allocation of certain share of common stock
("Shares") of Covance Inc. ("CPS") between the various employee stock ownership
programs being implemented as a result of the spin-off of CPS from Corning Life
Sciences Inc. (renamed as Corning Clinical Laboratories Inc. ). The 1996 Total
Allocation shall be determined and allocated as follows:

1.   The 1996 Total Allocation: The 1996 total allocation shall be determined as
     follows: The total allocation of shares to the Covance Inc. Employee Stock
     Ownership Plan ("ESOP") and the International Stock Ownership Plan shall
     equal 1.5% of the Shares outstanding on 31 December 1996, with the
     allocation between the two plans being made as follows.

2.   Aggregate International Base Compensation and Aggregate US Base
     Compensation. Aggregate International Base Compensation shall equal the sum
     of the Annualized Base Compensation (converted to US dollars) for each
     individual who is an International Eligible Employee on December 31, 1996.
     The Aggregate US Base Compensation shall equal the sum of the Annualized
     Base Compensation for each individual who is a US Eligible Employee on
     December 31, 1996. Total Aggregate Base Compensation shall be the sum of
     the Aggregate International Base Compensation and the Aggregate US Base
     Compensation.

3.   Allocation Between Plans. The portion of the 1996 Total Allocation shall be
     divided into the International Portion and the US Portion as follows: (I)
     first, shares having a value equal to 1% of Aggregate International
     Compensation shall be allocated to the International Portion and, (II)
     next, the remainder of the 1996 Total Allocation shall be allocated to the
     International Portion and the US Portion in the proportions represented by
     Aggregate International Compensation and Aggregate US Compensation
     respectively.

4.   Award to International Eligible Employees Under the International Stock
     Ownership Plan. The International Portion shall be allocated to
     International Eligible Employees under that Plan in accordance with Rule
     2.2 (a) thereof.

5.   Award US Eligible Employees. The Awards to US Employees shall be determined
     as follows:

          (a) For each US Eligible Employee, determine the amount of Award,
          based on the US Portion (as determined above) that would be provided
          under the ESOP without regard to the limitations imposed by Sections
          415 and 401(a)(17) of the Code.

          (b) For each US Eligible Employees, determine the amount of award,
          based on the US Portion (as determined above) that would be provided
          under the ESOP, after application of the limitations imposed by
          Section 415 and 401(a)(17) of the Code. This amount shall be awarded
          under the ESOP to such individuals.

                                       C1







                         FINAL DRAFT - NOVEMBER 15, 1996





               THE STOCK PURCHASE SAVINGS PLAN OF COVANCE INC.


                       (RESTATED AS OF DECEMBER 31, 1996)







<PAGE>
                                TABLE OF CONTENTS


INTRODUCTION.................................................................1

ARTICLE I     DEFINITIONS....................................................4

ARTICLE II    ELIGIBILITY AND PARTICIPATION.................................18

2.1           Eligibility...................................................18

2.2           Participation.................................................19

2.3           Beneficiary Designation.......................................19

2.4           Investment Option Specification...............................20

2.5           Notification of Individual Account Balance....................21

2.6           Diversification of Investments or Distribution for Certain
              Participants .................................................21

ARTICLE III   CONTRIBUTIONS.................................................24

3.1           Employee Pre-Tax Contributions................................24

3.2           Employer Matching Contributions...............................27

3.3           Discretionary Contributions...................................27

3.4           Rollover Contributions........................................28

3.5           Maximum Deductible Contribution...............................28

3.6           Actual Deferral Percentage Test...............................28

3.7           Payment of Contributions to Trustee...........................30

3.8           Actual Contribution Percentage Test...........................30

3.9           Multiple Use Restrictions.....................................31

ARTICLE IV    ALLOCATIONS TO INDIVIDUAL ACCOUNTS............................33

4.1           Individual Accounts...........................................33

4.2           Allocation of Employee Pre-Tax Contributions..................33

4.3           Allocation of Employer Matching Contributions.................33

4.4           Allocation of Discretionary Contributions.....................34

4.5           Allocation of Forfeitures.....................................34

4.6           Maximum Additions.............................................34

4.7           Multiple Plan Participation...................................36

                                       -i-
<PAGE>

ARTICLE V     DISTRIBUTIONS.................................................38

5.1           Normal Retirement.............................................38

5.2           Disability Retirement.........................................38

5.3           Death Before Retirement or Termination of Employment..........38

5.4           Death After Retirement or Termination of Employment...........39

5.5           Termination of Employment.....................................40

5.6           Method of Payment.............................................43

5.7           Benefits to Minors and Incompetents...........................46

5.8           Payment of Benefits...........................................47

5.9           Valuation of Accounts.........................................47

5.10          Direct Rollovers..............................................51

5.11          Payment to Alternate Payee Under QDRO.........................52

ARTICLE VI    LOANS AND WITHDRAWALS.........................................53

6.1           Loans to Participants.........................................53

6.2           Hardship Withdrawals..........................................56

6.3           Other Withdrawals.............................................59

ARTICLE VII   TRUST FUND/ESOP...............................................60

7.1           Contributions.................................................60

7.2           Trustee.......................................................60

7.3           Employer Stock Fund...........................................61

7.4           Corning Stock Fund and CCL Stock Fund.........................62

7.5           Dividends on ESOP Stock Attributable to Exempt Loan...........62

7.6           Voting and Tender Offer Rights on Employer Stock..............63

ARTICLE VIII  FIDUCIARIES...................................................64

8.1           General.......................................................64

8.2           Corporation...................................................64

8.3           Employer......................................................65

8.4           Trustee.......................................................65

8.5           Committee.....................................................66

8.6           Claims for Benefits...........................................67

                                      -ii-

<PAGE>

8.7           Denial of Benefits - Review Procedure.........................68

8.8           Records.......................................................69

8.9           Missing Persons...............................................69

ARTICLE IX    AMENDMENT AND TERMINATION OF THE PLAN.........................71

9.1           Amendment of the Plan.........................................71

9.2           Termination of the Plan.......................................71

ARTICLE X     PROVISIONS RELATIVE TO EMPLOYERS INCLUDED IN PLAN.............73

10.1          Method of Participation.......................................73

10.2          Withdrawal....................................................73

10.3          Adoption of ESOP by Participating Employer....................74

ARTICLE XI    TOP-HEAVY PROVISIONS..........................................76

11.1          Determination of Top-Heavy....................................76

11.2          Top-Heavy Definitions.........................................79

ARTICLE XII   MISCELLANEOUS.................................................81

12.1          Governing Law.................................................81

12.2          Construction..................................................81

12.3          Administration Expenses.......................................81

12.4          Participant's Rights; Acquittance.............................81

12.5          Spendthrift Clause............................................81

12.6          Merger, Consolidation or Transfer.............................82

12.7          Mistake of Fact...............................................82

12.8          Counterparts..................................................82

12.9          Transitional Rule.............................................82

ARTICLE XIII  ADOPTION OF THE PLAN..........................................83

SUPPLEMENT A - to The Stock Purchase Savings Plan Of Covance Inc.  - Employee
Stock Ownership Plan (ESOP)
SUPPLEMENT B - Supplemental List of Participating Employers


                                      -iii-
<PAGE>
                                  INTRODUCTION

      Effective July 1, 1972, Hazleton Laboratories Corporation adopted the
Hazleton Laboratories Corporation Profit Sharing Plan, a profit sharing plan.

      Effective January 1, 1986, Hazleton Laboratories Corporation amended the
Hazleton Laboratories Corporation Profit Sharing Plan in order to add a
qualified cash or deferred arrangement. At the same time, the name of the plan
was changed to the Hazleton Pre-Tax Savings Plan.

      Effective July 1, 1989, Hazleton Corporation (the "Corporation"), formerly
Hazleton Laboratories Corporation, amended and restated the Hazleton Pre-Tax
Savings Plan in its entirety to comply with the Tax Reform Act of 1986 and
subsequent legislation.

      Effective July 1, 1995, the Hazleton Pre-Tax Savings Plan was again
amended and restated in its entirety to reflect certain substantive changes and
renamed the Covance Inc. Retirement Savings Plan.

      Effective as of December 31, 1996, the plan is again amended and restated
in its entirety to reflect the adoption of an employee stock ownership plan and
is hereby renamed the Stock Purchase Savings Plan of Covance Inc.

      Except as expressly provided herein, the Plan provisions as in effect
immediately prior to this amendment and restatement shall remain in effect for
those participants who do not complete an hour of service at any time after
December 31, 1996.

      No provision of this amended and restated Plan shall be constructed to
eliminate or reduce any early retirement benefit or subsidy that continues after
retirement, or optional form of benefit which existed under the Plan prior to
this amendment and restatement, except to the extent permitted under Treasury
Regulations ss.1.401(a)-4 and ss.1.411(d)-4.

      This Plan consists of a profit sharing and stock bonus plan which is
intended to qualify under sections 401(a) and 401(k) of the Internal Revenue
Code, and an employee stock ownership plan which is intended to qualify as a
stock bonus plan under Section 401(a) of the Internal Revenue Code and as an

                                      -1-
<PAGE>

employee stock ownership plan under Section 4975(e)(7) of the Internal Revenue
Code. The assets of the employee stock ownership plan shall consist of the
amounts attributable to Employer Matching Contributions and Discretionary
Contributions on or after the Distribution Date. The assets of the employee
stock ownership plan shall be invested primarily in common shares of the
Employer ("Employer Stock") which qualify as "employer securities" within the
meaning of section 409(l) of the Internal Revenue Code.

     (a)  Spinoff of the Employer. As of the day prior to the Distribution Date,
          the Employer and its subsidiaries were members of the controlled group
          of corporations (within the meaning of section 414(b) of the Internal
          Revenue Code) that includes Corning. It is contemplated that as of a
          certain date (the "Distribution Date") on or before December 31, 1996,
          all of the shares of the Employer ("Employer Stock") held by Corning
          will be distributed to the shareholders of Corning as a spinoff
          dividend and the Employer will thereby cease to be a member of the
          controlled group of corporations that includes Corning. As a result of
          the spinoff of the Employer from Corning on the Distribution Date,
          Corning Stock held in Participants' accounts under the Plan will be
          converted into Corning Stock, CCL Stock and Employer Stock that will
          be received as dividends with respect to such Corning Stock. The
          Corning Stock, the dividend CCL Stock and the dividend Employer Stock
          will each represent a portion of the value of pre-spinoff investments
          of Participants' accounts in Corning Stock. As provided in Section
          7.4, and subject to the provisions thereof, following the Distribution
          Date, participants may elect to continue holding Corning Stock or CCL
          Stock in their accounts under the Plan or may elect to sell such
          shares and reinvest the proceeds in Employer Stock or any other
          Investment Option subject to the 

                                      -2-

<PAGE>


          decision by the Employer to direct the liquidation of such amounts.
          The Corning Stock Fund and the CCL Stock Fund are provided solely to
          permit the continued holding of Corning and CCL Shares allocated to
          Participants' accounts following the spinoff of the Employer.
          Accordingly, following the Distribution Date no future contributions
          or investment transfers may be made to the Corning Stock Fund or the
          CCL Stock Fund.

     (b)  Spinoff of Corning Life Sciences, Inc. As the day prior to the
          Distribution Date, Corning Life Sciences, Inc. ("CCL") and its
          affiliates were members of the controlled group of corporations
          (within the meaning of section 414(b) of the Internal Revenue Code)
          that includes Corning. On the Distribution Date, all of the shares of
          CCL held by Corning were distributed to the shareholders of Corning as
          a spinoff dividend and CCL thereby ceased to be a member of the
          controlled group of corporations that includes Corning. As a result of
          the spinoff of CCL from Corning the shares of Corning which had been
          held in Participants' Individual Accounts under the Plan ("Corning
          Shares") were converted into Corning Stock and shares of CCL and
          shares of the Employer that were received as dividends with respect to
          such Corning Shares. The Corning Stock and the dividend CCL and
          Employer shares each represent the pre-spinoff investments of
          Participants' Individual Accounts in Corning Stock. As a result of a
          corporate restructuring, effective as of the Distribution Date Corning
          Life Sciences, Inc. was renamed Quest Diagnostic Incorporated.



                                      -3-
<PAGE>



                                    ARTICLE I
                                   DEFINITIONS

1.1   As used herein, unless otherwise required by the context, the following
words and phrases shall have the meanings indicated:

      Active Participant - A Participant shall be deemed an Active Participant
with respect to a Fiscal Quarter if he is employed on the last day of such
Fiscal Quarter.

      Actual Contribution Percentage - (a) (1) For each Plan Year, the average
of the ratios, calculated separately for each Eligible Employee in a specified
group, of (A) the amount of Employer Matching Contributions under Section 3.2
which are allocated to the Individual Account of an Eligible Employee as of a
date within such Plan Year to (B) the Testing Compensation of such Eligible
Employee while an Eligible Employee for such Plan Year.

     (2) When calculating the Actual Contribution Percentage for a Highly
Compensated Empl oyee, all arrangements subject to Code Section 401(m)
maintained by the Employer or an Affiliate in which such Employee participates
(other than those that may not be permissively aggregated) shall be treated as
one arrangement. All matching contributions that are made under two or more
plans that are aggregated for purposes of Code Section 410(b)(other than Code
Section 410(b)(2)(A)(ii)) are to be treated as made under a single plan.

      (b) (1) In the case of a Highly Compensated Employee who is either a 5%
owner or one of the ten most highly compensated Employees and is thereby subject
to the family aggregation rules of Code Section 414(q)(6), the Actual
Contribution Percentage for the family group (which consists of a Highly
Compensated Employee described in this sentence and his HC Family Members and is
treated as one Highly Compensated Employee) is determined by combining the
Employer Matching Contributions and Testing Compensation of all eligible HC
Family Members with those of the Highly Compensated 


                                      -4-
<PAGE>


Employee. Except to the extent taken into account in the preceding sentence, the
Employer Matching Contributions and Testing Compensation of all HC Family
Members are disregarded in determining the Actual Contribution Percentages for
the groups of Highly Compensated Employees and non-highly compensated employees.

     (2) For purposes of applying the dollar limit on Testing Compensation, the
family group described in paragraph (1) will be treated as a single Highly
Compensated Employee with a single Testing Compensation, and the dollar limit
will be allocated among the members of the family group in proportion to each
member's individual Testing Compensation. Solely for purposes of the Testing
Compensation rule in this paragraph (2), the term "HC Family Member" shall
include only the spouse of the employee and any lineal descendants of the
employee who have not attained age 19 before the close of the Plan Year in
question

     Actual Deferral Percentage - (a) (1) For each Plan Year, the average of the
ratios, calculated separately for each Eligible Employee in a specified group,
of (A) the amount of Employee Pre-Tax Contributions under Section 3.1 (which are
attributable to Deferral Compensation that would have been received by the
Employee during such Plan Year but for his salary reduction agreement) which are
allocated to the Individual Account of an Eligible Employee as of a date within
such Plan Year to (B) the Testing Compensation of such Eligible Employee while
an Eligible Employee for such Plan Year.

     (2) Except as provided in regulations issued by the Secretary of the
Treasury, Actual Deferral Percentage shall be determined without regard to
whether any Employee Pre-Tax Contributions are distributed under Section
3.1(c)(2)(A). When calculating the Actual Deferral Percentage for a Highly
Compensated Employee, all cash or deferred arrangements maintained by the
Employer or an Affiliate in which such Employee participates (other than those
that may not be permissively aggregated) shall be treated as one arrangement.
All elective contributions that are made under two or more plans that are




                                      -5-
<PAGE>

aggregated for purposes of Code Section 410(b)(other than Code Section
410(b)(2)(A)(ii)) are to be treated as made under a single plan.

     (b) The special HC Family Member rules set forth in subsection (b) of the
definition of Actual Contribution Percentage shall also apply in determining the
Actual Deferral Percentage.

     Affiliate - An organization which is not an Employer, but which must be
considered together with an Employer under Code Sections 414(b), (c), (m) or
(o).

     Beneficiary - Any person designated by a Participant under Section 2.3 to
receive such benefits as may become payable hereunder after the death of such
Participant.

     Besselaar 401(k) Plan - The G.H. Besselaar Associates Profit Sharing 401(k)
Plan, the assets and liabilities of which have been transferred to this Plan.

     Board - The Board of Directors of the Corporation.

     Calendar Quarter - January 1 - March 31; April 17 - June 30; July 1 -
September 30; October 1 - December 31.

     Code - The Internal Revenue Code of 1986, as amended.

     Committee - The Benefits Administration Committee, as provided for in
Section 8.5.

     Contributions - Payments as provided herein by the Employer to the Trustee
for the purpose of providing the benefits under this Plan.

     Corning - Corning Incorporated, a New York corporation.

     Corning Life Sciences Plan - The Profit Sharing Plan of Corning Life
Sciences Inc. The assets and liabilities of the Corning Life Sciences Plan
representing the account balances of Corning SciCor, Inc. employees have been
transferred to this Plan.

     Corporation - Covance Inc., a Delaware corporation, or any successor
thereto. The Corporation is the sponsor, named 



                                      -6-
<PAGE>

Fiduciary, and plan administrator of the Plan for purposes of ERISA as it
relates to the employees of each Employer.

     Deferral Compensation - The Section 415 Compensation paid to an Employee by
the Employer for his services, excluding reimbursements or other expense
allowances, cash and non-cash fringe benefits (e.g., employee discounts), moving
expenses, deferred compensation and welfare benefits, plus Employee Pre-Tax
Contributions and salary reduction contributions to a Code Section 125 cafeteria
plan. For the Plan Year commencing July 1, 1995 and ending December 31, 1995,
Deferral Compensation in excess of $75,000 shall not be taken into account. For
Plan Years commencing after December 31, 1995, Deferral Compensation in excess
of $150,000 (or such different amount as may be applicable under Code Section
401(a)(17)(B)) shall not be taken into

     Discretionary Contributions - Contributions made by an Employer under
Section 3.3.

     Distribution Date - [ ], the effective date of the spinoff of the Employer
from Corning through the distribution of stock dividends in shares of Corning,
CCL and the Employer.

     Effective Date - July 1, 1972, except as set forth below. This amendment
and restatement is generally effective December 31, 1996. The Effective Date for
the following Employers is as follows:

- -------------------------------------------------------------------------------
Employer                                                         Effective Date
- -------------------------------------------------------------------------------

Covance Inc.  (Corning  Pharmaceutical  Services,  Inc.)         January 1, 1997

Covance Clinical and  Periapproval  Services Inc.                January 1, 1996
(Corning  Besselaar,Inc.)

Covance Clinical  Research Unit Inc.                             January 1, 1996
(Corning  Besselaar Clinical Research Unit, Inc.)

Covance Periapproval Services Inc.                               January 1, 1996
(Corning PACT, Inc.)                     
- -------------------------------------------------------------------------------
Covance Pharmaceutical Packaging Services Inc.                   January 1, 1996
Corning National Packaging, Inc.)
- -------------------------------------------------------------------------------

- -------------------------------------------------------------------------------
Covance Central Laboratory Services Inc.                         January 1, 1996
(Corning SciCor, Inc.)
- -------------------------------------------------------------------------------



                                      -7-
<PAGE>

     Eligible Employee - An Employee eligible for participation under Section
2.1.

     Employee - Any person employed by an Employer. Notwithstanding the
preceding sentence, Employee shall not include (1) independent contractors, (2)
any person who is covered by a collective bargaining agreement where such
agreement provides for a different retirement plan, or where no provision is
made for any retirement plan after good faith bargaining between the Employer
and employee representatives and (3) any person who is excluded from
participation hereunder by the terms of his Employer's adoption of this Plan. No
person who is a leased employee of an Employer within the meaning of Code
Section 414(n), or who receives compensation solely for service as a member of
the Board, shall be eligible to participate in this Plan.

     Employee Pre-Tax Account - That portion of a Participant's Individual
Account attributable to the Employee Pre-Tax Contributions allocated to such
Participant under Section 4.2 and any earnings or losses on such contributions.
The Employee Pre-Tax Account of a Participant who was a participant in a Merged
Plan that contained a qualified cash or deferred arrangement shall also hold any
amount transferred to this Plan from such Merged Plan representing the balance
of such Participant's pre-tax account under such Merged Plan and any earnings
and losses thereon.

     Employee Pre-Tax Contributions - Contributions made to the Plan by the
Employer under Section 3.1(a) pursuant to a salary reduction agreement entered
into between the Employer and the Participant.

     Employer - Collectively or individually as the context may indicate,
Covance Inc. (formerly Corning Pharmaceutical Services Inc. and any
participating employer listed in Supplemental B; 

                                      -8-
<PAGE>


and any other entity which (1) must be considered together with the Corporation
under Code Section 414(b), (c) or (m), (2) has been authorized by the Board to
adopt the Plan and (3) by action of its own board of directors shall have
adopted the Plan and, or any successor to one or more of such entities.

     Employer New Matching Account - That portion of a Participant's Individual
Account attributable to the Employer Matching Contributions allocated to such
Participant under Section 4.3 as of a date after June 30, 1995, and any earnings
and losses on such contributions. The Employer New Matching Account of a
Participant who was formerly a participant in the Corning Life Sciences Plan
also shall hold any amount transferred to this Plan from the Corning Life
Sciences Plan representing employer matching contributions held under the
Corning Life Sciences Plan and any earnings and losses thereon.

     Employer Matching Contributions - Contributions made to the Plan by the
Employer under Section 3.2.

     Employer Old Matching Account - That portion of a Participant's Individual
Account attributable to the Employer Matching Contributions allocated to such
Participant under this Plan as of a date before July 1, 1995, and any earnings
and losses on such contributions. The Employer Old Matching Account of a
Participant who was formerly a participant in the Besselaar 401(k) Plan also
shall hold any amount transferred to this Plan from the Besselaar 401(k) Plan
representing matching contributions made to the Besselaar 401(k) Plan and
earnings and losses thereon.

     Employer Stock - Any class of the Employer's common stock or the Employer's
preferred stock that is convertible into common stock. Employer Stock includes
ESOP Stock.


                                      -9-
<PAGE>

     Employment Commencement Date - The date on which an Employee first performs
an hour of service for an Employer (even if such date is before the Effective
Date with respect to such Employer) or, if the sponsor of a Merged Plan is not
an Employer, for the sponsor of a Merged Plan (even if such date is before the
Merger Date).

     ERISA - The Employee Retirement Income Security Act of 1974, as amended.

     ESOP Stock - Employer securities within the meaning of Code section 409(1)
that have been acquired with the proceeds of an Exempt Loan. Unallocated ESOP
Stock shall remain in a suspense account described in Section A-5 until
allocated to Participants' ESOP Accounts pursuant to Section A-9.

     Fiduciary - The Corporation, the Employer, the Trustee, the Committee and
any individual, corporation, firm or other entity which assumes, in accordance
with Article VIII, responsibilities of the Corporation, the Employer, the
Trustee or the Committee respecting management of the Plan or the disposition of
its assets.

     Fund - The Trust Fund.
      
     Highly Compensated Employee - (a) For any Plan Year, any employee described
in subsection (b) or (c).

     (b) Any employee who during the immediately preceding Plan Year:

     (1) was at any time a 5-percent owner (as defined in Code Section
416(i)(l));

     (2) received compensation (as defined in Code Section 414(q)(7)) from an
Employer or an Affiliate in excess of $50,000 (as adjusted under Code Section
414(q)(1)); or

     (3) was at any time an officer and received compensation (as defined in
Code Section 414(q)(7)) from an Employer or an Affiliate greater than 


                                      -10-
<PAGE>


50 percent of the amount in effect under Code Section 415(b)(1)(A) for such
year.

     (c) Any employee who during the current Plan Year:

     (1) was at any time a 5-percent owner (as defined in Code Section
416(i)(l));

     (2) received compensation (as defined in Code Section 414(q)(7)) from an
Employer or an Affiliate in excess of $50,000 (as adjusted under Code Section
414(q)(1)) and was one of the 100 employees receiving the most compensation (as
defined in Code Section 414(q)(7)); or

     (3) was at any time an officer who received compensation (as defined in
Code Section 414(q)(7)) from an Employer or an Affiliate greater than 50 percent
of the amount in effect under Code Section 415(b)(1)(A) for such year and was
one of the 100 employees receiving the most compensation (as defined in Code
Section 414(q)(7).

     This definition shall be applied in accordance with Code Section 414(q) and
the regulations issued thereunder.

     (d) For purposes of applying the HC Family Member aggregation rules under
this Plan, Highly Compensated Employee shall also include former employees who
separated prior to the Plan Year being tested and who met the definition of
Highly Compensated Employee in either (1) the Plan Year in which they separated
or (2) any Plan Year ending on or after their 55th birthday.

     HC Family Member - With respect to a Highly Compensated Employee who is
either a 5% owner or one of the ten most highly compensated Employees, the
spouse and the lineal ascendants and descendants (and spouses of such ascendants
and descendants) of any such Highly Compensated Employee.

     Individual Account - The aggregate of a Participant's Employee Pre-Tax
Account, Employer New Matching Account, Employer Old Matching Account, New
Discretionary Account, Old Discretionary Account and Rollover Account.



                                      -11-
<PAGE>

     Investment Option - The investment vehicle elected by the Participant in
accordance with Section 2.4(a) for investment of his Individual Account. The
Investment Options are the Fidelity Asset Manager Fund, Fidelity Balanced Fund,
Fidelity Contrafund, Fidelity Equity-Income Fund, Fidelity International Growth
& Income Fund, Fidelity Magellan Fund, Fidelity Managed Income Portfolio, and a
stock fund investing primarily in the common stock of the employer as defined in
Section 409(l) of the Code. In addition, effective as of the Distribution Date,
there shall be one or more funds investing primarily in the common stock of the
Employer ("the Employer Stock Funds"). As a result of the spinoff of the
Employer, there are also funds investing entirely in the common stock of Corning
and CCL, which shall not be available to receive new contributions effective as
of the Distribution Date. Effective January 1, 1996, the Fidelity Asset Manager
Fund: Growth and the Fidelity Asset Manager Fund: shall be available as
Investment Options. The Committee may add, change or delete the available
Investment Options at any time.

     Limitation Year - There is a short "limitation period" commencing July 1,
1995 and ending December 31, 1995. Effective January 1, 1996, the Limitation
Year is January 1 - December 31.

     Merged Plan - The Besselaar 401(k) Plan, the Corning Life Sciences Plan and
the National Packaging Plan, either individually or collectively as the case may
be.

     Merger Date - The Merger Date, with respect to the following plans, the
assets and liabilities of which have been transferred to this Plan, is as
follows:


- ------------------------------------------------=========================
                     Name                             Merger Date
- ------------------------------------------------=========================
G. H. Besselaar Associates Profit Sharing           January 1, 1996
401(k) Plan
- ------------------------------------------------=========================
National Packaging Systems, Inc. 401(k) Plan        January 1, 1996
- ------------------------------------------------=========================
Profit Sharing Plan of Corning Life Sciences
Inc. (assets and liabilities representing           January 1, 1996
account balances of Corning SciCor, Inc.
employees)
- ------------------------------------------------=========================


                                      -12-
<PAGE>


      National Packaging Plan - The National Packaging Systems, Inc. 401(k)
Plan, the assets and liabilities of which have been transferred to this Plan.

      Net Asset Value - With respect to any mutual fund that the Committee may
designate as an available Investment Option, the total net assets of the
respective fund divided by the number of outstanding shares of the respective
fund.
      New Discretionary Account - That portion of a Participant's Individual
Account attributable to the Discretionary Contributions allocated to such
Participant under Section 4.4 as of a date after June 30, 1995, and any earnings
and losses on such contributions. The New Discretionary Account of a Participant
who was formerly a participant in the Corning Life Sciences Plan also shall hold
any amount transferred to this Plan from the Corning Life Sciences Plan
representing discretionary contributions held under the Corning Life Sciences
Plan and any earnings and losses thereon.

      Normal Retirement Age - Age 65.

      Old Discretionary Account - That portion of a Participant's Individual
Account attributable to profit sharing contributions made by the Employer on
behalf of Plan Participants for periods prior to January 1, 1986 and
Discretionary Contributions allocated to such Participant under this Plan as of
a date before July 1, 1995, and any earnings and losses on such contributions.

      Participant - Any Employee or former Employee who has an Individual
Account balance and any Employee who has met the eligibility requirements of
Section 2.1. Participation ends in accordance with Section 2.2.

      Period of Severance - The period of time commencing on an Employee's
Severance from Service Date and ending on his Reemployment Commencement Date.

      Plan - The Stock Purchase Savings Plan of Covance Inc. formerly known as
The Corning Pharmaceutical Services Inc. Retirement Savings Plan (July 1, 1995
Restatement), as renamed herein the Stock Purchase 


                                      -13-
<PAGE>

Savings Plan of Covance Inc., as duly amended. Prior to July 1, 1995, the Plan
was known as the Hazleton Pre-Tax Savings Plan.

      Plan Year - There is a short Plan Year commencing July 1, 1995 and ending
December 31, 1995. Effective January 1, 1996, the Plan Year is January 1 -
December 31.

      Prime Rate - The "prime rate," as published in The Wall Street Journal.

      Reemployment Commencement Date - The first date on which an Employee
again performs an hour of service following a Period of Severance.

      Rollover Account - That portion of a Participant's Individual Account
attributable to his rollover contributions under Section 3.4 and any earnings or
losses on such contributions. The Rollover Account of a Participant who was
formerly a participant in the Besselaar 401(k) Plan also shall hold any amount
transferred to this Plan from the Besselaar 401(k) Plan representing rollover
contributions made to the Besselaar 401(k) Plan and any earnings and losses
thereon. The Rollover Account of a Participant who was formerly a participant in
the Corning Life Sciences Plan also shall hold any amount transferred to this
Plan from the Corning Life Sciences Plan representing rollover contributions
held under the Corning Life Sciences Plan and any earnings and losses thereon.

      Section 415 Compensation - An Employee's wages as defined in Code Section
3401(a) and all other payments of compensation to an Employee by an Employer (in
the course of the Employer's trade or business) for which the Employer is
required to furnish the Employee a written statement under Code Sections 6041(d)
and 6051(a)(3). Section 415 Compensation shall be determined without regard to
any rules that limit the remuneration included in wages based on the nature or
location of the employment or the services performed (such as the exception for
agricultural labor in Code Section 3401(a)(2)). Section 415 Compensation does
not include Employee Pre-Tax Contributions to this Plan and salary reduction
contributions to a Code Section 125 cafeteria plan.


                                      -14-
<PAGE>


      Severance from Service Date - The date on which an Employee quits,
retires, is discharged or dies, provided he does not earn an hour of service for
an Employer within 12 months after such date.

      Target Rate - The rate at which Employee Pre-Tax Contributions may be made
by each eligible Highly Compensated Employee for the balance of the Plan Year so
that one of the two qualifying tests under Section 3.6(a) will be satisfied for
such Plan Year.

      Testing Compensation - For each Participant, his Deferral Compensation.
For the Plan Year commencing July 1, 1995 and ending December 31, 1995, Testing
Compensation shall not be taken into account. For Plan Years commencing after
December 31, 1995, Testing Compensation in excess of $150,000 (or such different
amount as may be applicable under Code Section 401(a)(17)(B)) shall not be taken
into account.

      Total and Permanent Disability - A Participant shall be considered totally
and permanently disabled once the Committee, in its sole discretion, determines
that he has incurred a disability which renders him totally and permanently
unable to satisfactorily perform his usual duties for his Employer or the duties
of such other position which the Employer makes available to him and for which
he is qualified by reason of his training, education or experience. Such
determination shall be made by the Committee based on medical reports and such
other evidence which the Committee determines to be satisfactory; provided,
however, that conclusive evidence that the Participant is eligible for and is
receiving disability benefits under the provisions of the Federal Social
Security Act shall be sufficient to deem the Participant totally and permanently
disabled.

      Trust Agreement - The agreement entered into between the Employer and the
Trustee under Article VII.

      Trust Fund - All funds received by the Trustee together with all income,
profits and increments thereon, and less any expenses or payments made out of
the Trust Fund.


                                      -15-
<PAGE>



      Trustee - Such individual, individuals, financial institution, or a
combination of them as shall be designated in the Trust Agreement to hold in
trust any assets of the Plan for the purpose of providing benefits under the
Plan, and shall include any successor trustee to the Trustee initially
designated thereunder.

      Valuation Date - The date on which a Participant's Individual Account is
valued pursuant to Section 5.9. Subject to Section 5.9(b), the Valuation Date
shall be a date that falls as soon as administratively feasible after a
properly-completed written request for a distribution is received by an
authorized representative of the Committee.

      Year of Vesting Service - (a) As of any date, the aggregate of an
Employee's periods of vesting service, including any vesting service credited
under subsection (b) and excluding any vesting service disregarded under
subsection (c). For purposes of this subsection (a), a period of vesting service
is each period of time required to be recognized under this Plan commencing on
the Employee's Employment Commencement Date, or any subsequent Reemployment
Commencement Date, and ending on a Severance from Service Date.

            (b)   Vesting service shall also include the following:

                  (1)   Periods of employment with an Affiliate (while such
organization is an Affiliate) which would have constituted vesting service had
the Participant been employed by an Employer shall be included as if such
periods had been performed for an Employer; and

                  (2) Periods of employment with an Employer other than as an
Employee, including employment as a leased employee within the meaning of Code
Section 414(n), which would have constituted vesting service had the Participant
been employed as an Employee shall be included as if such periods had been
performed as an Employee.


                                      -16-
<PAGE>


                  (3) With respect to any person employed by the Employer on or
before December 31, 1998, periods of employment with Corning or Corning Clinical
Laboratories, Inc. (formerly Corning Life Sciences, Inc.) that would have been
counted as vesting service under the terms of the plan if such service was
rendered to the Employer as an Employee.

            (c) Years of Vesting Service recognized under the preceding
subsections shall not include any vesting service earned prior to a five-year
Period of Severance if, when the Period of Severance commenced, the Employee had
not yet earned any vested interest in his Employer New Matching Account or his
New Discretionary Account under Sections 5.5 or 11.1.





                                      -17-
<PAGE>

                                   ARTICLE II
                          ELIGIBILITY AND PARTICIPATION

2.1   Eligibility

      Any Employee who was a Participant in this Plan on December 30, 1996 shall
remain a Participant on December 31, 1996, as long as he remains an Employee on
such date. Any Employee who was not a Participant in this Plan on December 31,
1996 shall become a Participant on the date on which he completes an hour of
service with an Employer. Notwithstanding the preceding sentence, (a) any
Employee who was a participant in a Merged Plan immediately before the Merger
Date with respect to such Merged Plan shall become a Participant in this Plan on
such Merger Date; and (b) any Employee who was employed by an employer which
sponsored a Merged Plan immediately before the applicable Merger Date, but was
not a participant in such Merged Plan, shall be credited with service with the
sponsor prior to the Merger Date for purposes of determining when he shall
become eligible to participate in this Plan. Notwithstanding the foregoing, an
Employee shall become a Participant for purposes of receiving Employer Matching
Contributions under Section 3.2 on the date 6 months after he completes one hour
of service with an Employer.


                                      -18-
<PAGE>


2.2 Participation

      (a) Each Employee who is a Participant may, by filing a properly-completed
agreement with an authorized representative of the Committee, enter into a
salary reduction agreement in accordance with Section 3.1(a). Such agreement
shall be effective as of the first payroll period coincident with or next
following the later of (1) the date the Employee becomes a Participant, or (2)
the date on which the agreement is processed. If an Employee elects not to enter
into a salary reduction agreement on the date he is first eligible, he may, by
filing a properly-completed agreement with an authorized representative of the
Committee, enter into such an agreement effective as of the first payroll period
coincident with or next following the date on which the agreement is processed.

      (b) Each person who becomes a Participant shall remain a Participant so
long as he remains an Employee or maintains an Individual Account balance. If a
Participant terminates employment with no balance in his Individual Account, he
shall cease being a Participant upon his termination of employment. In the event
an Employee ceases to be a Participant and is later reemployed as an Employee,
he shall once again become a Participant upon his reemployment date.

2.3 Beneficiary Designation

      (a) Upon commencing participation, each Participant shall designate a
Beneficiary by filing a properly-completed form with an authorized
representative of the Committee. In the absence of any valid designation of
Beneficiary, the Participant shall be deemed to have designated his spouse as
his Beneficiary, and if the Participant is unmarried upon his death, he shall be
deemed to have designated his estate as his Beneficiary.

      (b) The Beneficiary of a married Participant shall be his spouse unless
the Participant designates someone other than his spouse as his Beneficiary, and
the Participant files with an authorized representative of the Committee his
spouse's written consent to such designation. Such spousal consent shall be 


                                      -19-
<PAGE>

on a form approved by the Committee, shall be irrevocable by the spouse, shall
acknowledge the effect of such designation and shall be witnessed by a Committee
member (or an authorized representative) or a notary public. The spouse may
alternatively execute an irrevocable general consent that does not identify the
designated Beneficiary and which allows the Participant to make future changes
in the Beneficiary designation without spousal consent. Any such general consent
shall satisfy the requirements of Treasury Regulation ss.1.401(a)-20 Q&A-31(c).

      (c) If an unmarried Participant later marries, or if a married Participant
later remarries, any prior designation by such Participant of a Beneficiary
other than the spouse to whom he is married on his date of death shall be null
and void unless consented to by such spouse in the manner provided in subsection
(b).

     (d) The interpretation of the Committee with respect to any Beneficiary
designation, subject to applicable law, shall be binding and conclusive upon all
parties, and no person who claims to be a Beneficiary, or any other person,
shall have the right to question any action of the Committee.

      (e)   The rights of any spouse or Beneficiary hereunder shall be
subject to the provisions of any qualified domestic relations order within
the meaning of ERISA Section 206(d)(3).

2.4   Investment Option Specification

      (a) This subsection (a) shall apply only to a Participant who became a
Participant on or after January 1, 1996. That portion of such a Participant's
Individual Account which represents Contributions made on his behalf with
respect to his first calendar month of participation automatically shall be
invested in the Fidelity Asset Manager Fund, unless the Committee specifies a
different Investment Option for this purpose. On or about the 15th day of the
next calendar month, the Participant may change his Investment Option
specification in accordance with subsection (b). Initial Investment Option
specifications shall be in increments of 5%. In the absence of any valid

                                      -20-
<PAGE>



Investment Option specification, a Participant's Individual Account shall
continue to be invested in the Fidelity Asset Manager Fund, unless the Committee
specifies a different Investment Option for this purpose.

      (b) A Participant may change his Investment Option specification with
respect to Contributions to be made in the future and with respect to amounts
already in his Individual Account by calling Fidelity Investments. Telephone
exchanges between Investment Options shall be subject to such administrative
procedures as have been instituted by Fidelity Investments and adopted by the
Committee. The Committee, in its sole discretion, may modify such procedures
after providing reasonable notification to Participants.

      (c) On or after the Distribution Date, each such election in effect under
the Plan to invest in the Employer Stock Fund shall be deemed an election under
the Plan to invest in the Corning Stock Fund, the CCL Stock Fund and the
Employer Stock Fund proportionately to the dividend received from Corning as of
such date. 

2.5 Notification of Individual Account Balance

      As of the last day of each calendar quarter, the Committee shall notify
each Participant of the amount of his share in the Contributions for the period
just completed and the balance of his Individual Account, including
distributions, loans and withdrawals, if any, since the effective date of the
last statement. 

2.6 Diversification of Investments or Distribution for Certain Participants

      For purposes of this Section 2.6, "Qualified Participant" shall mean a
Participant who has completed at least five years of participation in the ESOP
portion of the Plan: excluding any participation prior to December 31, 1996.

      "Qualified Election Period" shall mean the period of six Plan Years
beginning with the later of (i) the Plan Year in which the Participant first
becomes a Qualified Participant, or (ii) the Plan Year which includes the tenth
anniversary of the Distribution Date; provided that the Qualified Election



                                      -21-
<PAGE>

Period shall not begin unless and until the fair market value of Employer Stock
allocated to the Participant's ESOP Account is at least $500 as of any Valuation
Date.

      No later than 90 days after the last day of each Plan Year during his
Qualified Election Period, each Qualified Participant shall be permitted to
direct the Plan as to the investment of 100 percent (100%) of an amount equal to
the value of his Employer Match Account attributable to Employer Stock, plus
amounts previously transferred or distributed pursuant to an election under this
Section, to the extent such percentage exceeds the amounts transferred or
distributed pursuant to a prior election. No later than 90 days after the close
the last Plan Year in the Participant's Qualified Election Period, a Qualified
Participant may direct the Plan to the investment 100 percent (100%) of an
amount equal to the value of his Account balance attributable to Employer Stock,
plus amounts previously transferred or distributed pursuant to an election under
this Section, to the extent such a percentage exceeds the amounts transferred or
distributed pursuant to a prior election under this Section. The Participant's
direction shall be provided to the Committee in writing and shall be effective
no later than 180 days after the close of the Plan Year to which the direction
applies.

      The Plan shall satisfy the Participant's direction by transferring the
portion of his Account that is covered by the election to another qualified plan
(including the portion of this Plan that does not constitute an ESOP) of the
Employer that accepts the transfer and permits employee-directed investments and
offers the Participant at least three investment options (not inconsistent with
regulations prescribed by the Secretary of the Treasury) other than Employer
Stock. The transfer shall be made, and the amount transferred shall be invested
in accordance with the Participant's election, no later than 90 days after the
last day of the period during which the election can be made. If at the time of
an election no Employer then maintains a qualified plan that is eligible to
receive the portion of the Participant's Account that is covered by the



                                      -22-
<PAGE>

election, the Plan shall distribute that portion to the Qualified Participant
within 90 days after the last day of the period during which the election can be
made. This Section shall apply notwithstanding any other provision of the Plan,
other than such provisions as require the consent of the Participant to a
distribution with a present value in excess of $3,500. If the Participant does
not consent to such a distribution, the amount as to which the election is made
shall be retained in the Plan and the diversification requirement of this
Section shall be deemed to have been satisfied. Notwithstanding the foregoing,
the Participant's diversification election under the section shall not be
effective unless consented thereto by the Participant's spouse in accordance
with the requirements under section 5.6(d).



                                      -23-
<PAGE>



                                   ARTICLE III
                                  CONTRIBUTIONS

3.1   Employee Pre-Tax Contributions

      A Participant may have Employee Pre-Tax Contributions made to the Plan on
his behalf as follows:

      (a) (1) A Participant may enter into a salary reduction agreement with his
Employer in which it is agreed that the Employer will reduce the Participant's
Deferral Compensation during each pay period by a designated percentage and
contribute that amount so determined to the Plan on behalf of the Participant.
The Employer may disregard or modify a Participant's salary reduction agreement
(including a salary reduction agreement subject to the special limit set forth
in the last sentence of this paragraph) to the extent necessary to insure that
(1) the Actual Deferral Percentage test of Code Section 401(k) as set forth in
Section 3.6 is met, (2) the excess deferral rules of subsection (c) are met, or
(3) the limitations set forth in Sections 3.5 or 4.6 are not exceeded. Employee
Pre-Tax Contributions may be any whole percentage between 1% and 15% of the
Deferral Compensation otherwise payable to the Participant during the applicable
payroll period. Notwithstanding the preceding sentence, with respect to a
Participant who is a Highly Compensated Employee as defined in Section 414(q) of
the Code, the Employee Pre-Tax Contributions of such a Participant may not
exceed the maximum deferral percentage set from time to time by the Committee in
order for the Plan to satisfy the Actual Deferral Percentage Test under Section
3.6 for the Plan Year.

            The salary reduction agreement of an Employee who becomes eligible
to participate in the Plan shall be effective under the rules set forth in
Section 2.2.

            (2) Employee Pre-Tax Contributions shall be invested among the
various Investment Options in accordance with the Employee's outstanding
Investment Option election as in effect under Section 2.4.

                                      -24-
<PAGE>



     (b) (1) A Participant who has in effect a salary reduction agreement may
elect to change such agreement, including prospectively suspending such
agreement, by filing a properly-completed written notice with an authorized
representative of the Committee. Such election shall become effective as of the
first payroll period coincident with or next following the date on which it is
processed.

            (2) Amounts contributed by salary reduction shall be remitted to the
Trustee in accordance with Department of Labor Regulations at 29 C.F.R.
ss.2510.3-102. Contributions once elected to be deferred by a Participant shall
be credited to his Employee Pre-Tax Account under Section 4.2(a).

      (c)   Excess deferrals

            (1) No Participant may have Employee Pre-Tax Contributions made on
his behalf under this Plan in any calendar year which in the aggregate exceed
$7,000 or such greater amount as may be specified by the Secretary of the
Treasury for purposes of Code Section 402(g)(1). For purposes of the preceding
sentence, Employee Pre-Tax Contributions are deemed made as of the pay date for
which the salary is deferred, regardless of when the contributions are actually
made to the Trust Fund.

            (2) (A) If in any calendar year the aggregate of a Participant's
Employee Pre-Tax Contributions made on his behalf under this Plan, plus his
other elective deferrals under any other qualified cash or deferred arrangement
(as defined in Code Section 401(k)) maintained by any sponsor, under any
simplified employee pension (as defined in Code Section 408(k)), or used to have
an annuity contract purchased on his behalf under Code Section 403(b), exceed
the limitations of paragraph (1), then no later than the March 1 following such
calendar year the Participant may notify the Committee (i) that he has exceeded
the limitation and (ii) of the amount of his Employee Pre-Tax Contributions
under this Plan which he wants distributed to him (and earnings thereon)
notwithstanding his salary reduction agreement so that he will not


                                      -25-
<PAGE>

exceed the limitation. The Committee may require the Participant to provide
reasonable proof that he has exceeded the limitation of paragraph (1).

      If in any calendar year the aggregate of a Participant's Employee Pre-Tax
Contributions made on his behalf under the Plan, plus his other elective
deferrals under any other qualified cash or deferred arrangement (as defined in
Code Section 401(k)) maintained by the Employer, under a simplified employee
pension (as defined in Code Section 408(k)) sponsored by the Employer, or used
to have the Employer purchase an annuity contract on his behalf under Code
Section 403(b), exceed the limitations of paragraph (1), then the Participant
shall be deemed to have notified the Committee that (i) he has exceeded the
limitation and (ii) he wants distributed to him the amount of such excess
deferrals (and income thereon) notwithstanding the salary reduction agreement so
that he will not exceed the limitation. No later than the next April 15, the
Committee may (but shall not be obligated to) make the distribution requested,
or deemed to have been requested, by the Participant under this subparagraph.
Such distribution may be made notwithstanding any other provision of law or this
Plan. Except as otherwise provided by regulations issued by the Secretary of the
Treasury, such distribution shall not reduce the amount of Employee Pre-Tax
Contributions used in computing Actual Deferral Percentage, or the amount of
Employee Pre-Tax Contributions considered as Annual Additions under Section 4.6.
Any amounts not distributed under this subparagraph shall continue to be held in
accordance with the terms of this Plan.

                  (B)   After a distribution of excess Employee Pre-Tax
Contributions (if any) under subparagraph (A), Employer Matching
Contributions made with respect to such distributed Employee Pre-Tax
Contributions (if any) shall be withdrawn (with earnings thereon) from such
Participant's Employer New Matching Account and applied to reduce future
Employer Matching Contributions under Section 3.2.


                                      -26-
<PAGE>


3.2   Employer Matching Contributions

      Subject to Sections 3.5, 3.8 and 3.9, as of each calendar month, the
Employer shall make Employer Matching Contributions to the Trust Fund equal to
300% of the Employee Pre-Tax Contributions made by each eligible Participant
with respect to such calendar month (taking into account only those Employee
Pre-Tax Contributions made by the Participant with respect to such month which
are made at a rate that does not exceed 1% of the Participant's Deferral
Compensation) and 50% of the Employee Pre-Tax Contributions made by each
Participant with respect to such calendar month (taking into account additional
Employee Pre-Tax Contributions made by the Participant with respect to such
calendar month which are made at a rate that does not exceed 5% of the
Participant's Deferral Compensation).

      The Employer Matching Contributions shall be invested in Employer Stock.

      The Employer Matching Contribution otherwise required under this
Section 3.2 for any Plan Year shall be reduced by the fair market value
(determined as of December 31 of that plan year) of the Employer Stock
attributable to an Exempt Loan and allocated to the accounts of Participants,
as provided in Supplement A.

3.3   Discretionary Contributions

      As of the last day of each Fiscal Quarter, the Corporation, at the
discretion of the Board, may make a Discretionary Contribution. Such
Discretionary Contribution, if made, shall be expressed as a percentage of
Deferral Compensation and shall be allocated in accordance with Section 4.4. No
Discretionary Contribution shall be made with respect to any Participant who is
not an Active Participant for the applicable Fiscal Quarter. The Employer shall
also contribute sufficient Discretionary Contributions as may be required by
Section 11.1(b). 


                                      -27-
<PAGE>

3.4   Rollover Contributions

      Subject to the approval of the Committee, an Employee (regardless of
whether he has satisfied the initial eligibility requirements of Section 2.1)
may make a rollover contribution to the Plan, provided it qualifies for tax free
rollover treatment under Code Sections 402(c) or 408(d). Rollover contributions
must be in cash; contributions in-kind shall not be permitted. Such a
contribution shall be held in the Employee's Rollover Account and shall be 100%
vested at all times. The rollover contribution of an Employee who has not
satisfied the initial eligibility requirements of Section 2.1 shall be invested
in the Fidelity Asset Manager Fund, unless and until he makes a different
Investment Option specification pursuant to Section 2.4. The rollover
contribution of an Employee who has already satisfied the initial eligibility
requirements of Section 2.1 shall be invested in accordance with the Employee's
outstanding Investment Option specification. 


3.5   Maximum Deductible Contribution

      In no event shall the Employer be obligated to make a Contribution for
a Plan Year in excess of the maximum amount deductible by it under Code
Section 404(a)(3).

3.6   Actual Deferral Percentage Test

      (a) During each Plan Year, the Committee periodically shall monitor Plan
participation to determine whether the rate of Employee Pre-Tax Contributions
made pursuant to Section 3.1(a) for such Plan Year meets either of the following
qualifying tests (applied subject to Section 3.9):

            (1) The Actual Deferral Percentage for the group of eligible Highly
Compensated Employees will not exceed 125% of the Actual Deferral Percentage for
the group of all other Eligible Employees, or

            (2) The Actual Deferral Percentage for the group of eligible Highly
Compensated Employees will not exceed the Actual Deferral Percentage for the
group of all other Eligible Employees by more than two percentage points and by
more than 200%.


                                      -28-
<PAGE>


      (b) If the Committee determines during a Plan Year that neither of the
qualifying tests under subsection (a) shall be met in that Plan Year, then the
Committee, in its sole discretion, may require each Participant who is a Highly
Compensated Employee and whose rate of Employee Pre-Tax Contributions exceeds
the Target Rate to reduce his rate of Employee Pre-Tax Contributions for the
balance of such Plan Year to the extent necessary to ensure that his Employee
Pre-Tax Contributions will not exceed the Target Rate.

      (c) If, after the end of a Plan Year, the Committee determines that
neither of the qualifying tests under subsection (a) above shall be met for such
Plan Year, the Committee shall determine whether to follow the procedure set
forth in paragraph (1) or the procedure set forth in paragraph (2), as follows:

           (1) The Committee shall direct the Trustee to distribute, preferably
within 2 1/2 months after the last day of such Plan Year, but in any event no
later than the last day of the Plan Year immediately following such Plan Year,
to Highly Compensated Employees that portion of the Employee Pre-Tax
Contributions made on their behalf for such Plan Year (adjusted for income
allocable to such portion) necessary to ensure that one of the two qualifying
tests under subsection (a) shall be satisfied for such Plan Year. Contributions
made on behalf of Highly Compensated Employees shall be distributed under the
rules prescribed in Treasury Regulation ss.1.401(k)-1(f)(3). The amount of any
Employee Pre-Tax Contributions to be distributed under this paragraph (1) shall
be reduced by any excess deferrals previously distributed under Section
3.1(c)(2) for the calendar year ending in the same Plan Year. Similarly, any
excess deferrals to be distributed under Section 3.1(c)(2) shall be reduced by
any excess Employee Pre-Tax Contributions previously distributed under this
paragraph (1) for the Plan Year beginning in such calendar year. In connection
with a distribution of excess Employee Pre-Tax Contributions under this
paragraph (1), Employer Matching Contributions made with respect to distributed
Employee Pre-Tax Contributions (if any) shall be withdrawn (with 


                                      -29-
<PAGE>

earnings thereon) from the Participant's Employer New Matching Account and
applied to reduce future Employer Matching Contributions under Section 3.2.

            (2) As of the last day of such Plan Year, the Employer shall
contribute to the Employee Pre-Tax Account of each Participant who is not a
Highly Compensated Employee and who has elected under Section 3.1(a) to have
Employee Pre-Tax Contributions made on his behalf during such Plan Year that
amount, expressed as a uniform percentage of the Deferral Compensation of each
such Participant for such Plan Year, necessary to ensure that one of the two
qualifying tests under subsection (a) shall be satisfied for such Plan Year. All
contributions made by the Employer under this paragraph (2) shall be paid to the
Trustee no later than the last day of the Plan Year immediately following such
Plan Year and credited to the affected Participants' Employee Pre-Tax Accounts
as of the last day of the Plan Year immediately preceding the Plan Year in which
such contribution was made and shall be immediately 100% vested. Notwithstanding
the foregoing, for purposes of determining the amount of a Participant's
Employer Matching Contribution under Section 3.2, such contributions made by the
Employer under this paragraph (2) shall not be treated as Employee Pre-Tax
Contributions. 


3.7 Payment of Contributions to Trustee

      Unless an earlier time for contribution is specified elsewhere in this
Plan, in all events the Employer shall pay to the Trustee its Contributions for
each Plan Year within the time prescribed by law, including extensions of time
for the filing of its federal income tax return for the Employer's taxable year
during which such Plan Year ended. 

3.8 Actual Contribution Percentage Test

      (a) As of the last day of each Plan Year, the Committee shall determine
whether the rate of Employer Matching Contributions made under Section 3.2 for
such Plan Year meets either of the following qualifying tests (applied subject
to Section 3.9):


                                      -30-
<PAGE>


            (1) The Actual Contribution Percentage for the group of eligible
Highly Compensated Employees does not exceed 125% of the Actual Contribution
Percentage for the group of all other Eligible Employees, or

            (2) The Actual Contribution Percentage for the group of eligible
Highly Compensated Employees does not exceed the Actual Contribution Percentage
for the group of all other Eligible Employees by more than two percentage points
and by more than 200%.

      (b) If the Committee determines that neither of the qualifying tests under
subsection (a) shall be met in that Plan Year, then the Committee shall direct
the Trustee to distribute, preferably within 2 1/2 months after the last day of
such Plan Year, but in any event no later than the last day of the Plan Year
immediately following such Plan Year, to Highly Compensated Employees that
portion of the Employer Matching Contributions made on their behalf for such
Plan Year (adjusted for income allocable to such portion) necessary to ensure
that one of the two qualifying tests under subsection (a) shall be satisfied for
such Plan Year. (Employer Matching Contributions which are not 100% vested shall
be forfeited and allocated under Section 4.5 in lieu of being distributed.)
Employer Matching Contributions made on behalf of Highly Compensated Employees
shall be distributed (or forfeited, if applicable) under the rules prescribed in
Treasury Regulation ss.1.401(m)-1(e)(2). 


3.9 Multiple Use Restrictions

      The application of the Actual Deferral Percentage test in Section 3.6 and
the Actual Contribution Percentage test in Section 3.8 shall be coordinated in
accordance with regulations issued by the Secretary of the Treasury under Code
Section 401(m)(9), so as to prohibit the multiple use of the alternative
limitations set forth in Sections 3.6(a)(2) and 3.8(a)(2). Corrections required
by the multiple use restriction shall be effected by a reduction for any Highly
Compensated Employee participating in this Plan of the otherwise permissible
Employee Pre-Tax Contributions under Section 3.1 or Employer Matching
Contributions under Section 3.2 as shall be designated by the Employer.


                                      -31-
<PAGE>


      Notwithstanding the foregoing, this limitation shall be applied after
satisfying the mandatory disaggregation rules applicable to the portion of a
plan that constitutes an ESOP and the portion that does not constitute an ESOP.



                                      -32-
<PAGE>



                                   ARTICLE IV
                       ALLOCATIONS TO INDIVIDUAL ACCOUNTS

4.1   Individual Accounts

      (a) The Committee shall establish and maintain an Individual Account in
the name of each Participant, comprised of an Employee Pre-Tax Account, an
Employer New Matching Account, an Employer Old Matching Account, a New
Discretionary Account, an Old Discretionary Account and a Rollover Account to
which the Committee shall credit all amounts allocated to each such Participant
under this Article IV.

      (b) Separate accounts shall be maintained for all former Employee
Participants who have an interest in the Plan.

      (c)   The maintenance of separate accounts shall not require a
segregation of the Trust assets and no Participant shall acquire any right to
or interest in any specific asset of the Trust as a result of the allocations
provided for in the Plan.

4.2   Allocation of Employee Pre-Tax Contributions

      A Participant's Employee Pre-Tax Contributions under Section 3.1 shall
be allocated to the Participant's Employee Pre-Tax Account, and shall be
invested in accordance with the Participant's outstanding Investment Option
specification.  Allocations for Highly Compensated Employees shall be subject
to Sections 3.6 and 3.9.

4.3   Allocation of Employer Matching Contributions

      As of each calendar month, a Participant's allocable share of the Employer
Matching Contributions made on his behalf under Section 3.2 shall be allocated
to his Employer New Matching Account and shall be invested in accordance with
that Section , provided, however, that after the Distribution Date, the Employer
Matching Contribution will be invested 100% in Employer Stock. Allocations for
Highly Compensated Employees shall be subject to Sections 3.1(c)(2)(B),
3.6(c)(1), 3.8 and 3.9. 


                                      -33-
<PAGE>


4.4    Allocation of Discretionary Contributions

      (a) A Participant's allocable share as determined under subsection (b) of
the Discretionary Contribution shall be credited to the Participant's New
Discretionary Account as of the last day of the Fiscal Quarter for which the
Corporation shall make a Discretionary Contribution under Section 3.3 and shall
be invested in accordance with the Participant's outstanding Investment Option
specification, provided, however, that the Employer may direct that all or any
portion of such contribution shall be invested in Employer Stock.

      (b) Each Participant who is an Active Participant for the Fiscal Quarter
with respect to which the Corporation shall make a Discretionary Contribution
shall receive an allocation of the Discretionary Contribution. No other
Participant shall receive an allocation. Each Active Participant shall receive
an amount equal to the Discretionary Contribution, expressed as a percentage of
Deferral Compensation, multiplied by the Active Participant's Deferral
Compensation during the Fiscal Quarter. 

4.5 Allocation of Forfeitures

      As of the last day of each Fiscal Quarter, any forfeitures arising under
Sections 3.8(b) or 5.5(c) shall be used to the extent necessary to restore a
Participant's Employer New Matching Account and New Discretionary Account as
provided in Section 5.5(c)(1), and/or shall be applied to reduce Discretionary
Contributions under Section 3.3 and Employer Matching
Contributions under Section 3.2.

4.6   Maximum Additions

      (a) Notwithstanding anything herein to the contrary but subject to
subsection (b), the sum of the Employee Pre-Tax Contributions, Employer Matching
Contributions and Discretionary Contributions allocated to a Participant's
Individual Account for any Limitation Year (the "Annual Additions"), when
combined with any annual additions credited to the Participant for the same
period under another qualified defined contribution 


                                      -34-
<PAGE>

plan maintained by the Employer or an Affiliate, shall not exceed the lesser of
the following:

            (1)   $30,000 or such larger amount as may be determined under
Code Section 415(c)(1)(A); or

            (2) 25% of the Participant's total Section 415 Compensation received
from the Employer for such Limitation Year.

      (b) In the event a Participant is covered by more than one defined
contribution plan maintained by the Employer (or an Affiliate), the maximum
Annual Additions to this Plan shall be decreased as determined necessary by the
Employer to insure that the limitations of Code Section 415(c) are not exceeded.

      In the event that corrective adjustments in the Annual Additions to any
Individual Accounts are required due to a reasonable error in estimating a
Participant's compensation or in determining the amount of Employee Pre-Tax
Contributions that may be made with respect to any Participant under the annual
additions limit of Sections 4.6(a) and (b), the adjustment shall first be made
by reducing the Employee Pre-Tax Contributions, next the Discretionary
Contributions, and finally the Employer Matching Contributions.

      Any amounts withheld or taken from a Participant's Individual Account
pursuant to the above shall be segregated in the Trust Fund in a separate
account and applied toward the Contribution of the Employer for the next
Limitation Year, except that Employee Pre-Tax Contributions shall be distributed
to the Participant who made them.

      (c) A Participant's annual additions with respect to Employer Stock
allocable to the Participant's Employer Matching Contribution Account and
attributable to an Exempt Loan shall be determined on the basis of the lesser of
contributions thereto or the value of Employer Stock released from the Suspense
Account and, if no more than one third of the Employer Matching Contributions
which are deductible under Section 404(a)(9) of the Code by reason of their
application to make payments on an Exempt Loan are allocated 


                                      -35-
<PAGE>

to Highly Compensated Employees, a Participant's annual additions shall not
include employer contributions which are deductible under Section 404(a)(9)(B)
of the Code by reason of their applications to the payment of interest on an
Exempt Loan or forfeitures of Employer Stock attributable to an Exempt Loan. 


4.7    Multiple Plan Participation

      (a) If a Participant is a participant in a defined benefit plan maintained
by the Employer, the sum of his defined benefit plan fraction (determined in
subsection (c)) and his defined contribution plan fraction (determined in
subsection (b)) for any Limitation Year may not exceed 1.0.

      (b) The term "defined contribution plan fraction" shall mean a fraction,
the numerator of which is the sum of all of the Annual Additions to the
Participant's Individual Account under this Plan as of the close of the
Limitation Year and the denominator of which is the sum of the lesser of the
following amounts determined for such Limitation Year and for each prior
Limitation Year of employment with the Employer:

            (1)   the product of 1.25 multiplied by the dollar limitation in
effect under Section 4.6(a)(1) for such Year; or

            (2) the product of 1.4 multiplied by an amount determined under
Section 4.6(a)(2) for such Year.

      (c) The term "defined benefit plan fraction" shall mean a fraction the
numerator of which is the Participant's projected annual benefit determined as
of the close of the Limitation Year and the denominator of which is the lesser
of:
            (1) the product of 1.25 multiplied by the dollar limitation in
effect under Code Section 415(b)(1)(A) for such Limitation Year; or

            (2) the product of 1.4 multiplied by the amount which may be taken
into account under Code Section 415(b)(1)(B) with respect to each individual
under the Plan for such Limitation Year.

      For purposes of this limitation, all defined benefit plans maintained by
an Employer (or any Affiliates), whether or not terminated, are to be treated as


                                      -36-
<PAGE>

one defined benefit plan and all defined contribution plans maintained by an
Employer (or any Affiliates), whether or not terminated, are to be treated as
one defined contribution plan. The extent to which the annual benefit under any
defined benefit plans shall be reduced in order to achieve compliance with the
limitations of Code Section 415 shall be determined in such a manner so as to
maximize the aggregate benefits payable to such Participant. If such reduction
is under this Plan, the Committee shall advise affected Participants of any
additional limitation on their annual benefits required by this Section.

      (d) The above limitations in Section 4.6 and this Section 4.7 are intended
to comply with the provisions of Code Section 415 so that the maximum benefits
able to be provided by plans of the Employer shall be exactly equal to the
maximum amounts allowed under Code Section 415. If there is any discrepancy
between the provisions of Section 4.6 or this Section 4.7 and the provisions of
Code Section 415, such discrepancy shall be resolved in such a way as to give
full effect to the provisions of Code Section 415, which provisions are hereby
incorporated by reference.

                                      -37-
<PAGE>



                                    ARTICLE V
                                  DISTRIBUTIONS

5.1   Normal Retirement

      Upon the retirement of a Participant on or after attaining his Normal
Retirement Age, the value of his Individual Account (as determined under Section
5.9) shall become 100% vested and shall become payable as soon as
administratively feasible following his retirement. The Committee shall
thereupon direct the Trustee to distribute to the retiring Participant such
amount in accordance with Section 5.6. 

5.2 Disability Retirement

      (a) A Participant may retire from the employment of the Employer on the
first day of any month coincident with or next following a determination by the
Committee that the Participant has incurred a Total and Permanent Disability.
Upon the retirement of a Participant under this Section 5.2, the value of his
Individual Account (as determined under Section 5.9) shall become 100% vested
and shall become payable as soon as administratively feasible following his
retirement. The Committee shall thereupon direct the Trustee to distribute to
the retiring Participant such amount in accordance with Section 5.6.

      (b) Notwithstanding anything herein to the contrary, a Participant who
retires in accordance with this Section 5.2 shall (1) have the right to delay
receipt of his disability retirement benefit until the time required by Section
5.8(b), and (2) if deferred benefit commencement is elected, have the right at
any time subsequent to his disability retirement date but prior to the time
required by Section 5.8(b) to request benefit commencement at some earlier date.


5.3 Death Before Retirement or Termination of Employment

      (a) Upon the death of a Participant before retirement or termination of
employment, the value of such Participant's Individual Account (as determined


                                      -38-
<PAGE>

under Section 5.9) shall become 100% vested and shall become payable as soon as
administratively feasible following his death. Subject to subsection (b), the
Committee shall direct the Trustee to distribute to the deceased Participant's
Beneficiary such amount in accordance with Section 5.6. After the death of the
Participant, the Participant's Beneficiary shall be entitled to select the
Investment Options in which the Individual Account will be invested in
accordance with the same rules then applicable to Participant selection of
Investment Options.

      (b) If the Beneficiary is the Participant's surviving spouse and the value
of the Participant' Individual Account exceeds $3,500, then the Individual
Account shall be paid by purchase of an annuity contract providing for annuity
payments for the spouse's lifetime, unless the spouse shall elect in writing to
receive the Individual Account in a lump sum or installments under Section
5.6(c). Subject to Section 5.8(c), payments under an annuity contract shall
commence at a time designated by the spouse, but in no event earlier than a date
that falls as soon as administratively feasible following the Participant's date
of death. 

5.4 Death After Retirement or Termination of Employment

      (a) Upon the death of a Participant who has terminated employment and who
is not receiving benefit payments in accordance with a form of distribution
under Section 5.6, the value of the vested portion of such Participant's
Individual Account (as determined under Section 5.9) shall become payable as
soon as administratively feasible following his death. (For any Participant who
is receiving benefit payments in accordance with a form of distribution under
Section 5.6, the provisions of such form of distribution shall control any
payments upon the death of such Participant.) Subject to subsection (b), the
Committee shall direct the Trustee to distribute to the deceased Participant's
Beneficiary such amount in accordance with Section 5.6. After the death of the
Participant, the Participant's Beneficiary shall be entitled to select the
Investment Options in which the Individual Account will 


                                      -39-
<PAGE>


be invested in accordance with the same rules then applicable to Participant
selection of Investment Options.

      (b) If the Beneficiary is the Participant's surviving spouse and the value
of the vested portion of the Participant's Individual Account exceeds $3,500,
then the Individual Account shall be paid by purchase of an annuity contract
providing for annuity payments for the spouse's lifetime, unless the spouse
shall elect in writing to receive the Individual Account in a lump sum or
installments under Section 5.6(c). Subject to Section 5.8(c), payments under an
annuity contract shall commence at a time designated by the spouse, but in no
event earlier than a date that falls as soon as administratively feasible
following the Participant's date of death. 


5.5 Termination of Employment

      (a) Upon termination of employment for any reason other than retirement
under Section 5.1 or 5.2, or death, a Participant shall be entitled to the value
of the vested portion of his Individual Account (as determined under Section
5.9) and payable at the time set forth in subsection (b). A Participant shall at
all times be one hundred percent (100%) vested in his Employee Pre-Tax Account,
his Employer Old Matching Account, his Old Discretionary Account and his
Rollover Account. Subject to the next sentence, a Participant shall have a
vested interest in the following percentage of his Employer New Matching Account
and his New Discretionary Account, based upon his Years of Vesting Service:

- --------------------------------==========================
   Years of Vesting Service          Vested Interest
- --------------------------------==========================
          less than 2                      0%
- --------------------------------==========================
               2                           25%
- --------------------------------==========================
               3                           50%
- --------------------------------==========================
           4 or more                      100%
==========================================================


                                      -40-
<PAGE>

Notwithstanding the preceding sentence, (1) a Participant who had three or more
years of service under this Plan as of June 30, 1995 shall at all times be one
hundred percent (100%) vested in his Employer New Matching Account and his New
Discretionary Account; and (2) a Participant who was formerly a participant in
the Besselaar 401(k) Plan and who had three or more years of service under the
Besselaar 401(k) Plan as of December 31, 1995 shall at all times be one hundred
percent (100%) vested in his Employer New Matching Account.

      (b) (1) As soon as administratively feasible following a Participant's
termination of employment, the Committee shall direct the Trustee to distribute
to such Participant the value of the vested portion of his Individual Account
(as determined under Section 5.9). Notwithstanding the preceding sentence, if
the amount to be distributed under this subsection (b) exceeds (or at the time
of any prior distribution exceeded) $3,500, then no distribution shall be made
prior to the Participant attaining his Normal Retirement Age unless he consents
in writing to the making of such distribution. The consent of the Participant
shall be obtained in writing within the 90-day period ending on the date
distribution commences. The Participant shall be given a written notice of the
right to defer any distribution until the Participant's Individual Account
balance is no longer immediately distributable. Such notification shall be
provided no less than seven days and no more than 90 days prior to the date
distribution commences and shall inform the Participant that he has a right to a
period of at least 30 days after receiving the notice to consider the decision
of whether or not to elect a distribution.

            (2) As soon as administratively feasible following the attainment of
Normal Retirement Age on the part of a Participant who has previously terminated
his employment but the distribution of whose benefit has not commenced, the
Committee shall direct the Trustee to distribute to such Participant the value
of his Individual Account (as determined under Section 5.9) in a lump sum
payment.



                                      -41-
<PAGE>

      (c) If a Participant's employment terminates for any reason other than
retirement or death at a time when he is not fully vested in his Employer New
Matching Account and New Discretionary Account, then the Committee shall follow
the procedure set forth in paragraph (1) or that set forth in paragraph (2)
below, as appropriate:

            (1) If the vested portion of the Participant's Employer New Matching
Account and New Discretionary Account is distributed to him at any time before
the end of the second Plan Year following the Plan Year in which his employment
terminated, the remaining portion of such Accounts shall be forfeited as of the
date of such termination of employment. However, if the Participant had no
vested interest in his Employer New Matching Account and New Discretionary
Account at the time of his termination of employment, the Committee nonetheless
shall treat the Participant as if he had received a distribution on the date his
employment terminated and shall forfeit the Participant's entire Employer New
Matching Account and New Discretionary Account on the date his employment
terminated. If the former Participant returns as an Employee prior to incurring
a five-year Period of Severance beginning immediately after the date of his
distribution (or on the date his employment terminated in the case of a former
Participant who had no vested interest in his Employer New Matching Account and
New Discretionary Account on the date his employment terminated), and if he
repays the full amount of the distribution (if any) paid to him by reason of his
termination of employment no later than the fifth anniversary of the date of his
reemployment, then his Employer New Matching Account and New Discretionary
Account, determined as of the date of the distribution of his vested interest,
shall be fully restored to him as of the end of the Plan Year in which such
repayment occurred. In such case, the Participant's Employer New Matching
Account and New Discretionary Account shall be restored first out of forfeitures
for such Plan Year and, if such forfeitures are insufficient to restore such
Accounts, the 


                                      -42-
<PAGE>

Employer shall make a special contribution to the extent necessary so that the
Participant's Accounts are fully restored.

            (2) If a Participant's vested interest in his Employer New Matching
Account and New Discretionary Account is not distributed to him before the end
of the second Plan Year in which his employment terminated, any portion of such
Accounts which is not vested shall be forfeited after he incurs a five-year
Period of Severance. If a Participant receives a distribution of his Individual
Account before a forfeiture is permitted and at a time when he is not fully
vested in his Employer New Matching Account and New Discretionary Account and is
reemployed as an Employee before incurring a five-year Period of Severance, his
vested interest in each such Account upon his subsequent reemployment shall be
determined by: (A) multiplying the applicable percentage from Section 5.5(a)
hereof by the sum of the value of the Participant's Account and the amount of
the distribution from such Account, and (B) subtracting the amount of the
distribution from the amount determined under (A).

      (d) In the event a Participant who terminated his employment with an
Employer is reemployed as an Employee prior to receiving a distribution of his
Individual Account, he shall not be entitled to a distribution as provided in
this Section 5.5 due to such termination, but shall be entitled to a
distribution as determined herein upon any subsequent termination of employment
for any reason.

5.6 Method of Payment

      (a)   Normal Form

            In the absence of the election of an optional method of payment as
provided in subsection (c), benefit payments hereunder shall be made in a lump
sum. Furthermore, distributions to a Participant (or to his Beneficiary if the
Participant dies before distribution of his benefit has commenced), the value of
the vested portion of whose Individual Account does not exceed (or at the time
of any prior distribution did not exceed) $3,500, automatically shall be 


                                      -43-
<PAGE>

made in a lump sum. Payment from investments held in Employer Stock may be
distributed in cash or in stock, at the direction of the Participant. Payments
from other investment accounts shall be made only in cash.

      (b)   Election Procedures

           (1) No less than seven and no more than 90 days before distribution
of a Participant's benefit commences, each Participant and his spouse (if any)
shall be given a written notice to the effect that if the Participant is married
on the date of commencement of payments and has elected an annuity under
subsection (c)(2), (c)(3) or (c)(4), benefits will be payable in the form of a
"qualified joint and survivor annuity" under subsection (d) unless the
Participant, with the consent of his spouse, elects to the contrary prior to the
commencement of payments. The notice shall describe, in a manner intended to be
understood by the Participant and his spouse, the terms and conditions of the
qualified joint and survivor annuity, the financial effect of the election of an
optional form or absence of election, the rights of the Participant to elect an
optional form or to revoke such an election, and the rights of the Participant's
spouse to consent to an election of an optional form. In addition, the notice
shall inform the Participant that he has 30 days to elect whether to have
benefits paid in an optional form.
 
           (2) During the 90-day period ending on the day his distribution
commences, each Participant whose Individual Account balance exceeds (or at the
time of any prior distribution exceeded) $3,500 may elect to have his benefit
hereunder paid under any one of the options set forth in subsection (c) in lieu
of the normal form provided for in subsection (a).

            (3) A Participant or Beneficiary who desires to have his benefit
hereunder paid under one of the optional methods provided in subsection (c)
shall make such an election by written request to an authorized representative
of the Committee on forms provided by the Committee. An election by a
Participant to receive his retirement benefit under any of the optional methods
of payment as provided in subsection (c) may be revoked by such Participant in


                                      -44-
<PAGE>

writing to an authorized representative of the Committee at any time and any
number of times during the 90-day period ending on the day his benefit payments
commence. After retirement benefit payments have commenced, no elections or
revocations of an optional method will be permitted under any circumstances.

      (c)   Available Options

            (1) Monthly, quarterly or annual installments from the Trust Fund
over a period not to exceed the lesser of (A) 10 years, or (B) the life
expectancy of the Participant or the joint life expectancies of the Participant
and his Beneficiary, in either case determined at the time payments commence.
Life expectancies shall be determined when payments commence and shall not
thereafter be recalculated. If a Participant or Beneficiary elects installment
payments, his Individual Account shall be fully invested in the Fidelity Asset
Manager Fund (unless it is already so invested) as soon as practicable following
the election of installment payments, and shall remain fully invested in such
Fund throughout the payment period.

            (2) Subject to subsection (d), an annuity contract, purchased from
an insurance company (or similar source) by the Committee utilizing the value of
the vested portion of the Participant's Individual Account, which provides for
equal monthly payments over the Participant's (or Beneficiary's) lifetime and
which contains such other terms and provisions as may be approved in writing by
such Participant or Beneficiary.

            (3) Subject to subsection (d), an annuity contract, purchased from
an insurance company (or similar source) by the Committee utilizing the value of
the vested portion of the Participant's Individual Account, which provides for
equal monthly payments over the Participant's lifetime and for such monthly
payments (or one-half thereof) to be continued after his death to the
Participant's designated Beneficiary over the lifetime of the Beneficiary. If
the designated Beneficiary is not living at the death of the Participant, no
additional benefit shall be payable hereunder. Such annuity contract shall


                                      -45-
<PAGE>

contain such other terms and promises as may be approved in writing by the
electing Participant. (This optional method shall not be available to a
Beneficiary.)

            (4) Subject to subsection (d), an annuity contract, purchased from
an insurance company (or similar source) by the Committee utilizing the value of
the vested portion of the Participant's Individual Account, which provides for
equal monthly payments over the Participant's lifetime and in the event of his
death before 120 monthly payments have fallen due, such payments shall be
continued to the Participant's designated Beneficiary until the remainder of the
120 monthly payments have been paid. Such annuity contract shall contain such
other terms and provisions as may be approved in writing by the electing
Participant. (This optional method shall not be available to a Beneficiary.)

     (d)   Qualified Joint and Survivor Annuity

      If a Participant is married on the date distribution of his Individual
Account commences, no form of payment described in subsection (c)(2), (c)(3) or
(c)(4) may be elected unless (a) it is the joint and survivor annuity of
subsection (c)(3) with one-half of the Participant's lifetime amount payable
after his death to his surviving spouse (to whom he was married on the date
payments to the Participant first commenced) as his Beneficiary, or (2) the
Participant's spouse consents in writing to the form elected. Such consent shall
acknowledge its effect and be witnessed by a Committee member (or an authorized
representative) or a notary public. Spousal consent is not required if there is
no spouse, the spouse cannot be located or under such other circumstances as may
be prescribed by regulations. Any spousal consent shall only be applicable to
the spouse granting such consent

5.7 Benefits to Minors and Incompetents

      (a) In case any person entitled to receive payment under the Plan shall be
a minor, the Committee, in its discretion, may distribute such payment in any
one or more of the following ways:



                                      -46-
<PAGE>

     (1) By payment thereof directly to such minor;

     (2) By application thereof for the benefit of such minor;

     (3) By payment thereof to either parent of such minor or to any person who
shall be legally qualified and shall be acting as guardian of the person or the
property of such minor, provided the parent or adult person to whom any amount
shall be paid shall have advised the Committee in writing that he will hold or
use such amount for the benefit of such minor.

     (b) In the event a person entitled to receive payment under the Plan is
physically or mentally incapable of personally receiving and giving a valid
receipt for any payment due (unless prior claim therefor shall have been made by
a duly qualified legal representative of such person), such payment in the
discretion of the Committee may be made to the spouse, son, daughter, parent,
brother or sister of the recipient or to any other person who is responsible for
the welfare of such recipient.

     (c) Any payments made under subsections (a) or (b) shall, to the extent of
the payments, fully discharge the obligations of the Committee and the Plan to
any other person making a claim hereunder with respect to such payments.

5.8 Payment of Benefits

     (a) Except as provided in subsection (b), in the event a Participant's
Individual Account shall be due and payable under this Article V and the
Participant has not elected otherwise in accordance with the Plan, any payment
of benefits to the Participant shall begin not later than 60 days after the
close of the Plan Year in which occurs the latest of:

     (1) the date on which the Participant attains age 65;

     (2) the 10th anniversary of the date in which the Participant commenced
participation in the Plan; and

     (3) termination of employment of the Participant with the Employer.



                                      -47-
<PAGE>

     (b) Notwithstanding subsection (a) above, distribution of a Participant's
benefit shall be made no later than April 1 of the calendar year following the
calendar year during which such Participant attains age 70 1/2, regardless of
whether or not he has terminated employment with the Employer. Such distribution
shall be made over a period not extending beyond the life or life expectancy of
the Participant or the joint lives or life expectancies of the Participant and a
designated Beneficiary. Life expectancies shall be determined at the time
payments commence and shall not thereafter be recalculated.

     (c) If a Participant dies before distribution of his benefit has commenced,
the Participant's entire benefit shall be distributed within five years after
his death. The preceding sentence shall not apply to any portion of the
Participant's benefit if the following requirements in paragraphs (1) and, if
applicable, (2) are met with respect to such portion:

     (1) (A) if the portion of the Participant's benefit is payable to or for
the benefit of a designated Beneficiary;

     (B) such portion will be distributed over a period not extending beyond the
life expectancy of such Beneficiary at the time payments commence; and

     (C) such distributions begin not later than December 31 of the calendar
year following the calendar year of the Participant's death.

     (2) If the designated Beneficiary referred to in paragraph (1)(A) above is
the surviving spouse of the Participant, then the date on which the
distributions are required to begin under paragraph (1)(C) shall not be earlier
than December 31 of the calendar year in which the Participant would have
attained age 70 1/2.

     If the surviving spouse dies before the distributions to such spouse begin,
this Section 5.8(c) (with the exception of paragraph (2)) shall be applied as if
the surviving spouse were the Participant.



                                      -48-
<PAGE>

     This Section 5.8(c) shall not apply if the distribution of the
Participant's benefit has commenced prior to his death and the remaining portion
of the Participant's benefit will be distributed at least as rapidly as under
the method of distribution being used at the date of the Participant's death.

     For purposes of this Section 5.8(c), under regulations to be prescribed by
the Secretary of the Treasury, any amount paid to a child shall be treated as if
it had been paid to the surviving spouse upon such child reaching the age of
majority (or other designated event prescribed under such regulations).

     (d) Distributions under this Article V shall be made in accordance with
regulations issued by the Secretary of the Treasury under Code Section
401(a)(9), including Treasury Regulation ss.1.401(a)(9)-2, which regulations
shall override any distribution options in this Plan inconsistent with Section
401(a)(9).

5.9 Valuation of Accounts

     All distributions hereunder shall be based upon the value of the
Participant's Individual Account as determined under this Section 5.9.

     (a) The value of a Participant's Individual Account upon a distribution
hereunder shall be the sum of paragraphs (1)-(10) below, where:

     (1) is the product of (A) the closing Net Asset Value of the Fidelity Asset
Manager Fund: Income on the Valuation Date, and (B) the number of shares of such
fund allocated to the Participant's Individual Account as of such Valuation
Date;

     (2) is the product of (A) the closing Net Asset Value of the Fidelity Asset
Manager Fund on the Valuation Date, and (B) the number of shares of such fund
allocated to the Participant's Individual Account as of such Valuation Date;

     (3) is the product of (A) the closing Net Asset Value of the Fidelity Asset
Manager Fund: Growth on the Valuation Date, and (B) the 


                                      -49-
<PAGE>


number of shares of such fund allocated to the Participant's Individual Account
as of such Valuation Date;

     (4) is the product of (A) the closing Net Asset Value of the Fidelity
Balanced Fund on the Valuation Date, and (B) the number of shares of such fund
allocated to the Participant's Individual Account as of such Valuation Date;

     (5) is the product of (A) the closing Net Asset Value of the Fidelity
Contrafund on the Valuation Date, and (B) the number of shares of such fund
allocated to the Participant's Individual Account as of such Valuation Date;

     (6) is the product of (A) the closing Net Asset Value of the Fidelity
Equity-Income Fund on the Valuation Date, and (B) the number of shares of such
fund allocated to the Participant's Individual Account as of such Valuation
Date;

     (7) is the product of (A) the closing Net Asset Value of the Fidelity
International Growth & Income Fund on the Valuation Date, and (B) the number of
shares of such fund allocated to the Participant's Individual Account as of such
Valuation Date;

     (8) is the product of (A) the closing Net Asset Value of the Fidelity
Magellan Fund on the Valuation Date, and (B) the number of shares of such fund
allocated to the Participant's Individual Account as of such Valuation Date; and

     (9) is the sum of (A) the number of shares of the Fidelity MG42 Managed
Income Portfolio allocated to the Participant's Individual Account as of the
last day of the calendar month coincident with or next preceding the Valuation
Date, and (B) interest, if any, credited from the first day of the calendar
month in which falls the Valuation Date to the Valuation Date;

     (10) is the product of (A) the per unit value of the Employer Stock Fund,
the Corning Stock Fund and the CCL Stock Fund on the Valuation Date, and 


                                      -50-
<PAGE>


(B) the number of Unit of such fund allocated to the Participant's Individual
Account as of such Valuation Date.

     (b) If a Discretionary Contribution is made on behalf of a Participant
after the date on which his Individual Account is valued under subsection (a),
the Participant shall receive an additional distribution equal to the amount of
the Discretionary Contribution and any earnings or losses thereon. Such
additional distribution shall be valued in the same manner as the Participant's
Individual Account was valued under subsection (a), except that the Valuation
Date shall be a date that falls as soon as administratively feasible after the
Discretionary Contribution is made.

5.10 Direct Rollovers

     (a) Notwithstanding any provision of the Plan to the contrary that would
otherwise limit a distributee's election under this Section, a distributee may
elect, at the time and in the manner prescribed by the Committee, to have any
portion of an eligible rollover distribution paid directly to an eligible
retirement plan specified by the distributee in a direct rollover.

     (b) (1) An "eligible rollover distribution" is any distribution of all or
any portion of the balance to the credit of the distributee, except that an
eligible rollover distribution does not include: any distribution that is one of
a series of substantially equal periodic payments (not less frequently than
annually) made for the life (or life expectancy) of the distributee or the joint
lives (or joint life expectancies) of the distributee and the distributee's
designated beneficiary, or for a specified period of ten years or more; any
distribution to the extent such distribution is required under Section 401(a)(9)
of the Code; and the portion of any distribution that is not includible in gross
income (determined without regard to the exclusion for net unrealized
appreciation with respect to employer securities).

         (2) An "eligible retirement plan" is an individual retirement account
described in section 408(a) of the Code, an individual retirement annuity
described in section 408(b) of the Code, an annuity plan described in 


                                      -51-
<PAGE>


section 403(a) of the Code, or a qualified defined contribution plan described
in section 401(a) of the Code, that accepts the distributee's eligible rollover
distribution. However, in the case of an eligible rollover distribution to the
surviving spouse, an eligible retirement plan is an individual retirement
account or individual retirement annuity.

     (3) A "distributee" includes an employee or former employee. In addition,
the employee's or former employee's surviving spouse and the employee's or
former employee's spouse or former spouse who is the alternate payee under a
qualified domestic relations order, as defined in Section 414(p) of the Code,
are distributees with regard to the interest of the spouse or former spouse.

     (4) A "direct rollover" is a payment by the Plan to the eligible retirement
plan specified by the distributee.

5.11 Payment to Alternate Payee Under QDRO

     Notwithstanding any other provision of this Plan, once the Committee
determines that a domestic relations order is a qualified domestic relations
order ("QDRO") within the meaning of Section 206(d)(3) of ERISA, unless the QDRO
specifically provides otherwise, the Committee shall direct the Trustee to
distribute, as soon as administratively feasible following the date on which the
Committee determines that the domestic relations order is a QDRO, to the
alternate payee named in the QDRO the benefit provided therein in a lump sum.

                                      -52-
<PAGE>



                                   ARTICLE VI
                              LOANS AND WITHDRAWALS

6.1  Loans to Participants

      The Committee, upon the request of a Participant, may at its discretion
make loans from the Trust Fund to Participants who are "parties in interest" as
defined in ERISA Section 3(14). The following additional rules shall apply:

      (a) Prior to January 1, 1996, a Participant may only make a loan under
this Section 6.1 if the loan is made on account of an immediate and heavy
financial need of the Participant, as determined under subsection (b), and is
necessary to satisfy the financial need. The determination of the existence of
financial hardship and the amount necessary to be loaned to satisfy the
immediate financial need created by the hardship shall be made by the Committee
in a uniform and nondiscriminatory manner. A Participant requesting a loan
hereunder may be required to submit whatever documentation the Committee, in its
sole discretion, deems necessary to establish the existence of financial
hardship and the amount necessary to be loaned to satisfy the financial need
created by the hardship.

      (b) A loan will be considered to be made on account of an immediate and
heavy financial need of the Participant for purposes of subsection (a) only if
it is on account of:

            (1) Expenses for medical care described in Code Section 213(d)
previously incurred by the Participant, the Participant's spouse, or any
dependents of the Participant (as defined in Code Section 152), or necessary for
such persons to obtain medical care described in Code Section 213(d);

            (2)   Purchase (excluding mortgage payments) of a principal
residence for the Participant;

            (3) Payment of tuition and other related expenses, including room
and board, billed directly by the institution for post-secondary education for
the Participant, his spouse, children, or dependents;


                                      -53-
<PAGE>


            (4) The need to prevent the eviction of the Participant from his
principal residence or foreclosure on the mortgage of the Participant's
principal residence;

            (5)   Expenses incurred in refinancing a principal residence of
the Participant; or

            (6) Capital renovations of the Participant's principal residence
performed under contract by a third party.

      (c) A Participant may only have one loan outstanding at any time. The
minimum new loan amount shall be $1,000. If a Participant's Individual Account
balance is insufficient to support the minimum loan amount loan because of the
maximum loan restrictions set forth below, no loan shall be made. The maximum
amount of any loan, when added to the outstanding balance of any existing loan
from this Plan, shall be the lesser of (1) and (2):

            (1) $50,000 reduced by the excess of the highest outstanding balance
of loans from the Plan during the one-year period ending on the day before the
date the loan is made over the outstanding balance of loans from the Plan on the
date the loan is made.

            (2) One-half of the value of the vested portion of the Participant's
Individual Account on the date the loan is made.

      (d) All loans shall be repayable over a period of not more than five
years, except that a loan used by the Participant to acquire any dwelling unit
which within a reasonable time is to be used (determined at the time the loan is
made) as a principal residence of the Participant shall be repayable over a
period of not more than 10 years.

      (e) Each loan shall be secured by one-half of the value of the vested
portion of the Participant's Individual Account balance; shall bear interest at
a rate of one percent (1%) above the Prime Rate in effect on the last day of the
calendar quarter coincident with or next preceding the calendar quarter in which
the loan is applied for; shall be repaid by payroll deduction each pay period in
accordance with a reasonable repayment schedule requiring 


                                      -54-
<PAGE>


substantially level payments of principal and interest; and shall be evidenced
by a written promissory note setting forth the terms of the loan. A Participant
may prepay the entire outstanding loan balance without penalty. To the extent a
Participant's pay from the Employer is insufficient to make the payments due
under a loan, but such Participant is not covered by the provisions of
subsection (f), such Participant shall make his loan payments out of his own
personal funds.

      (f) In the event of the death or termination of employment of a
Participant, the unpaid balance of any outstanding loan to such Participant,
together with accrued interest, shall be deducted from the amount otherwise due
him or his Beneficiary, notwithstanding the provisions of Section 12.5.

      (g)   The Committee shall apply the provisions of this Section in a
uniform and nondiscriminatory manner which is not inconsistent with
Department of Labor regulations at 29 C.F.R. ss.2550.408b-1.

      (h) Each loan shall be considered a separate investment option of the
Individual Account of the Participant. Notwithstanding Section 4.1(c), when a
loan is made, the amount of the loan shall be withdrawn from sub-accounts within
the Participant Individual Account among the separate Investment Options in
which each sub-account is invested and transferred to a segregated loan account
maintained in his name. The loan amount shall be withdrawn from the sub-accounts
within the Individual Account in the following order: (1) Old Discretionary
Account; (2) the vested portion of the New Discretionary Account; (3) Employer
Old Matching Account; (4) the vested portion of the Employer New Matching
Account; (5) Rollover Account; and (6) Employee Pre-Tax Account. Within each
sub-account, the loan amount shall be withdrawn from the separate Investment
Options in the following order: (1) Fidelity Managed Income Portfolio; (2)
Fidelity Balanced Fund; (3) Fidelity Equity-Income Fund; (4) Fidelity Asset
Manager Fund: Income; (5) Fidelity Asset Manager Fund; (6) Fidelity Asset
Manager Fund: Growth; (7) Fidelity Contrafund; (8) Fidelity Magellan Fund; (9)
Fidelity International Growth & 


                                      -55-
<PAGE>


Income Fund; (10) CCL Stock Fund; (11) Corning Stock Fund; and (12) Employer
Stock Fund. Payments of principal and interest against a loan shall thereafter
be allocated ratably among the sub-accounts from which the loan was withdrawn
and invested in accordance with a Participant's outstanding Investment Option
specification, except with regard to the Employer Matching Account allocable to
Employer Stock under Section 3.2.

      (i)   There may be an administrative charge imposed on each new loan in
an amount determined by the Committee.

      (j)   In the event a Participant defaults on a loan from this Plan, the
Plan shall foreclose on so much of the Participant's Individual Account as is
given as collateral for the loan when such amounts are otherwise available
for distribution under the terms of the Plan.

6.2   Hardship Withdrawals

      (a) Upon request of the Participant, and with the approval of the
Committee, a Participant shall be allowed to withdraw all or part of the value
of his Individual Account which is available under subsection (e) while still
employed by the Employer. Withdrawn amounts may not be repaid to the Trust Fund.
Withdrawals shall be charged first against the Participant's Rollover Account,
then against his Employee Pre-Tax Account, then against his Employer Old
Matching Account, then against the vested portion of his Employer New Matching
Account, then against his Old Discretionary Account, and finally against the
vested portion of his New Discretionary Account. Within such Accounts,
withdrawals shall be charged against the separate Investment Options in the
following order: (1) Fidelity Managed Income Portfolio; (2) Fidelity Balanced
Fund; (3) Fidelity Equity-Income Fund; (4) Fidelity Asset Manager Fund: Income;
(5) Fidelity Asset Manager Fund; (6) Fidelity Asset Manager Fund: Growth; (7)
Fidelity Contrafund; (8) Fidelity Magellan Fund; (9) Fidelity International
Growth & Income Fund; (10) CCL Stock Fund; (11) the Corning Stock Fund; and (12)
Employer Stock Fund.


                                      -56-
<PAGE>


      (b) A Participant may only make a withdrawal under this Section 6.2 if the
withdrawal is made on account of an immediate and heavy financial need of the
Participant, as determined under subsection (c)(1), and is necessary to satisfy
the financial need, as determined under subsection (c)(2). The determination of
the existence of financial hardship and the amount necessary to be withdrawn to
satisfy the immediate financial need created by the hardship shall be made by
the Committee in a uniform and nondiscriminatory manner, in accordance with the
standards and restrictions set forth in subsection (c) below. A Participant
requesting a withdrawal hereunder may be required to submit whatever
documentation the Committee, in its sole discretion, deems necessary to
establish the existence of financial hardship and the amount necessary to be
withdrawn to satisfy the financial need created by the hardship.

      (c) (1) Immediate and heavy financial need. A withdrawal will be
considered to be made on account of an immediate and heavy financial need of the
Participant for purposes of subsection (b) only if it is on account of:

                  (A) Expenses for medical care described in Code Section 213(d)
previously incurred by the Participant, the Participant's spouse, or any
dependents of the Participant (as defined in Code Section 152) or necessary for
such persons to obtain medical care described in Code Section 213(d);

                  (B)   Purchase (excluding mortgage payments) of a principal
residence for the Participant;

                  (C) Payment of tuition for the next 12 months of
post-secondary education for the Participant, his spouse, children, or
dependents;

                  (D) The need to prevent the eviction of the Participant from
his principal residence or foreclosure on the mortgage of the Participant's
principal residence; or



                                      -57-
<PAGE>

                  (E) For any other reason which the Commissioner of Internal
Revenue deems to constitute such an immediate and heavy financial need in
accordance with Treasury Regulation ss.1.401(k)-1(d)(2)(iv)(C).

            (2) Amount necessary to satisfy the need. A withdrawal will be
considered to be in an amount necessary to satisfy a Participant's need under
paragraph (1) for purposes of subsection (b) only if:

                  (A)   It does not exceed the amount of the need under
paragraph (1);

                  (B) If the Participant's withdrawal is charged against any
portion of his Employee Pre-Tax Account, the Participant has obtained all
non-hardship distributions and non-taxable loans he is eligible for and is able
to provide collateral for under any plan the Employer may sponsor (including
this Plan);

                  (C) If the Participant's withdrawal is charged against any
portion of his Employee Pre-Tax Account, the Participant may not make any
Employee Pre-Tax Contributions under Section 3.1 for a period of 12 months after
his withdrawal, nor may he make any other elective contributions to any Employer
plan as described in Treasury Regulation ss.1.401(k)-1(d)(2)(iv)(B)(4) (but
shall still be otherwise considered an Eligible Employee during such
suspension); and

                  (D) If the Participant's withdrawal is charged against any
portion of his Employee Pre-Tax Account, the Participant's maximum annual
Employee Pre-Tax Contributions under Section 3.1(c) for the calendar year
following the calendar year in which he receives his withdrawal are reduced by
the amount of Employee Pre-Tax Contributions he made in the calendar year in
which he receives his withdrawal.

                        Notwithstanding subparagraphs (A) through (D), a
Participant's withdrawal may be considered to be in an amount necessary to
satisfy a need under paragraph (1) if it satisfies a method prescribed by the



                                      -58-
<PAGE>

Commissioner of Internal Revenue under Treasury Regulation
ss.1.401(k)-1(d)(2)(iv)(C).

      (d) In addition to the amount necessary to meet the immediate financial
need created by the hardship, the Participant may, at his election, also
withdraw any amount necessary to cover withholding for federal income tax
purposes.

      (e) A Participant's hardship withdrawal under this Section 6.2 shall be
limited to the aggregate of all his Employee Pre-Tax Contributions made prior to
the withdrawal (excluding earnings thereon allocated to his Employee Pre-Tax
Account as of a date after December 31, 1988), reduced by the amount of any
prior withdrawal of such Contributions, plus the value of his Rollover Account,
the value of his Employer Old Matching Account, the value of the vested portion
of his Employer New Matching Account, the value of his Old Discretionary
Account, and finally the value of the vested portion of his New Discretionary
Account. 

6.3 Other Withdrawals

      In addition to the withdrawals available under Section 6.2, a Participant
who was formerly a participant in the Besselaar 401(k) Plan shall be allowed to
withdraw all or part of the value of his Individual Account (pursuant to the
hierarchy set forth in Section 6.2(a)) upon the attainment of age 59 1/2.



                                      -59-
<PAGE>



                                   ARTICLE VII
                                 TRUST FUND/ESOP

7.1   Contributions

      Contributions by the Employer and Participants as provided for in Article
III shall be paid over to the Trustee. All Contributions by the Employer shall
be irrevocable, except as otherwise provided in this Plan and may be used only
for the exclusive benefit of the Participants and their Beneficiaries. The
Employer's Contribution will be made either in cash or in Employee Stock, or
partially in each. Any Employer Stock comprising a portion of the Employer
Matching Contribution shall be valued at the fair-market value thereof at the
date or dates on which any contribution in that form is made 

7.2 Trustee

      The Corporation will maintain an agreement with the Trustee whereunder the
Trustee will receive, invest and administer as a trust fund Contributions made
under this Plan in accordance with the Trust Agreement.

      Such Trust Agreement is incorporated by reference as a part of the Plan,
and the rights of all persons entitled to benefits hereunder are subject to the
terms of the Trust Agreement. The Trust Agreement specifically provides, among
other things, for the investment and reinvestment of the Fund and the income
thereof, the management of the Fund, the responsibilities and obligations of the
Trustee, removal of the Trustee and appointment of a successor, accounting by
the Trustee and the disbursement of the Fund.

      Subject to a Participant's Investment Option specification, the Trustee
shall, in accordance with the terms of such Trust Agreement, accept and receive
all sums of money paid to it from time to time by the Employer, and shall hold,
invest, reinvest, manage and administer such moneys and the increment, increase,
earnings and income thereof as a trust fund for the exclusive benefit of the
Participants and their Beneficiaries and for the payment of reasonable expenses
of administering the Plan. 

                                      -60-
<PAGE>

7.3 Employer Stock Fund

      The Employer Stock Fund shall be invested in the common stock of the
Employer, provided such stock qualifies as qualifying employer securities within
the meaning of ERISA Section 407(d)(5). The level of Plan assets invested in
such fund shall be determined by Participant Investment Option specifications,
and may consist of up to 100% of all Plan assets.

      (a)   Employer Stock Fund.  Employer Stock received by the Plan as a
      dividend

            with respect to Corning Stock in connection with the spinoff of the
            Employer shall remain invested as Employer Stock. Following the
            Distribution Date, consistent with the stated purposes of the Plan,
            and subject to the provisions of Section 7.4, the Trustee shall
            invest that portion of the assets of the Plan consisting of the
            Employer Matching Contribution in Employer Stock to the end that, in
            the largest measure possible, Participants may share in the earnings
            of the Employer and acquire a proprietary interest in the Employer;
            provided, however that all Employer Matching Contributions shall be
            used to make payments on Exempt Loans to the extent provided in
            Section A-7. The Trustee will also invest any other assets
            attributable to Participants' Individual Accounts in Employer Stock
            in accordance with Participants' elections under subsection 2.4 and
            will invest amounts invested in Corning Stock and CCL Stock in
            Employer Stock in accordance with Section 7.4. Any Employer Stock
            acquired and held in accordance with this Section will be known and
            referred to as the "Employer Stock Fund".

      (b)   ESOP Stock. The portion of the Employer Matching Account (including
            amounts attributable to ESOP Loans) invested in Employer Stock shall
            be held and invested in the "ESOP Stock Fund," which may be a
            subaccount of the Employer Stock Fund.

                                      -61-
<PAGE>

      (c)   ESOP Stock Transfers by Participants. Except for transfers from a
            Participant's investments in Corning Stock or CCL Stock (for
            conversion of Corning Stock to Employer Stock within a Participant's
            Individual Account) pursuant to Section 7.4) transfers may not be
            made to or from a Participant's Matching Contribution Account
            invested in the Employer Stock Fund.

7.4   Corning Stock Fund and CCL Stock Fund

Corning Stock and CCL Stock received by the Plan as a result of the spinoff of
the Company shall be invested in the "Corning Stock Fund" and the "CCL Stock
Fund", respectively. Subject to the following proviso, Corning Stock held in the
Corning Stock Fund and CCL Stock held in the CCL Stock Fund and allocated to a
Participant's Individual Account shall be invested in Investment Options as
directed by the Participant in accordance with Section 2.4 Notwithstanding the
foregoing, on December 31, 1997 or one year from the Distribution Date, if
later, any Corning Stock and CCL Stock remaining in the Corning Stock Fund or
CCL Stock Fund shall be applied to the purchase of Employer Stock which shall be
held in the Employer Stock Fund and allocated to Participants' respective
accounts.

7.5   Dividends on ESOP Stock Attributable to Exempt Loan

      It is anticipated that all dividends payable with respect to shares of
ESOP Stock held in the Suspense Account shall be used for the purpose of
repaying one or more Exempt Loans and will not be allocated to Participants'
Employer Matching Accounts invested in Employer Stock and that all dividends
payable 

                                      -62-
<PAGE>


with respect to all other Employer Stock held in the Trust Fund shall be added
to the Participants' Employer Stock Fund, subject to Section A-6. Nevertheless,
the Committee may, in its sole discretion, determine for any Plan Year that
dividends payable with respect to shares of ESOP Stock shall, if payable in cash
(I) paid currently to Participants or (ii) used for the purpose of repaying one
or more Exempt Loans if such use of said dividends so applied meets the
requirements of Code Section 404(k). Such discretion herein granted may be
exercised by the Committee independently, and in whole or in part, with respect
to the stock held from time to time in one or more of Employer Stock Funds
established under the Trust. Discretion so exercised for any Plan Year, or for
any portion thereof, may be changed by the Committee at any subsequent time.
Cash dividends which are to be paid to the Participants may be paid directly by
the Company or may be paid by the Trustee within ninety (90) days after the end
of the Plan year or receipt by the Trustee.

7.6   Voting and Tender Offer Rights on Employer Stock

Each Participant shall have the right to vote all shares of Employer Stock held
in the Participant's accounts. Each Participant shall also have the right to
direct the Trustee whether to tender such shares of Stock in the event an offer
is made by any person other than the Employer to purchase such shares. The
Committee shall make any such arrangements with the Trustee as may be
appropriate to pass such voting or tender offer rights through to a Participant.
In the event a Participant fails to vote his shares or fails to indicate his
preference with respect to a tender offer, the Trustee shall vote the
Participant's shares or tender his shares in the same proportions as those Plan
Participants who did respond cast their votes or tendered their shares. The
Trustee shall also vote and exercise any tender offer rights with respect to
unallocated ESOP Stock held in a suspense account in the same proportions as
those Plan Participants who responded cast their votes or tendered their shares.



                                      -63-
<PAGE>



                                  ARTICLE VIII
                                   FIDUCIARIES

8.1   General

      Each Fiduciary who is allocated specific duties or responsibilities under
the Plan or any Fiduciary who assumes such a position with the Plan shall
discharge his duties solely in the interest of the Participants and
Beneficiaries and for the exclusive purpose of providing such benefits as
stipulated herein to such Participants and Beneficiaries, or of defraying
reasonable expenses of administering the Plan. Each Fiduciary in carrying out
such duties and responsibilities shall act with the care, skill, prudence, and
diligence under the circumstances then prevailing that a prudent person acting
in a like capacity and familiar with such matters would use in exercising such
authority or duties.

      A Fiduciary may serve in more than one Fiduciary capacity and may employ
one or more persons to render advice with regard to his Fiduciary
responsibilities. If the Fiduciary is serving as such without compensation, all
expenses reasonably incurred by such Fiduciary shall be reimbursed by the
Employer or, at the Corporation's direction, from the assets of the Trust.

      A Fiduciary may allocate any of his responsibilities for the operation and
administration of the Plan. In limitation of this right, a Fiduciary may not
allocate any responsibilities as contained herein relating to the management or
control of the Fund except (1) through the employment of an investment manager
as provided in Section 8.3 and in the Trust Agreement relating to the Fund, or
(2) to the extent Participants specify their own Investment Options.

8.2  Corporation

      The Corporation established and maintains the Plan for the benefit of its
Employees and those of participating Employers and of necessity retains control
of the operation and administration of the Plan. The Corporation is the Plan
administrator within the meaning of ERAS Section 3(16)(A). The 


                                      -64-
<PAGE>

Corporation in accordance with specific provisions of the Plan has, as herein
indicated, delegated certain of these rights and obligations to the Employer,
the Trustee and the Committee and these parties shall be solely responsible for
these, and only these, delegated rights and obligations.

8.3  Employer

      The Employer shall indemnify each member of the Board of Directors, the
Committee, and any of its employees to whom any fiduciary responsibility with
respect to the Plan is allocated or delegated, from and against any and all
liabilities, costs and expenses incurred by such persons as a result of any act
or omission to act in connection with the performance of their fiduciary duties,
responsibilities and obligations under the Plan and under ERAS, except for
liabilities and claims arising from such fiduciary's willful misconduct or gross
negligence. For such purpose, the Employer may obtain, pay for and keep current
a policy or policies of insurance. Where such policy or policies of insurance
are purchased, there shall be no right to indemnification under this Section
8.3, except to the extent of any deductible amount under the policy or policies
or with regard to covered claims in excess of the insured amount. No Plan assets
may be used for any indemnification.

      The Employer shall supply such full and timely information for all matters
relating to the Plan as (a) the Committee, (b) the Trustee, and (c) the
accountant engaged on behalf of the Plan by the Corporation may require for the
effective discharge of their respective duties.

8.4 Trustee

      The Trustee, in accordance with the Trust Agreement, shall have authority
to manage the Fund, except that (1) the Committee may in its discretion employ
at any time and from time to time an investment manager (as defined in section
3(38) of ERAS) to direct the Trustee with respect to all or a designated portion
of the assets comprising the Fund, and (2) Participants may specify their own
Investment Options.


                                      -65-
<PAGE>


      Each Participant in the Plan shall be a "named fiduciary" within the
meaning of section 402 of the Employee Retirement Income Security Act of 1974,
as amended ("ERAS"), to the extent that Employer Stock or shares of Corning or
JCL, whether or not allocated to his accounts, are voted or tendered according
to the Participant's directions 

8.5 Committee

      The Board shall appoint a Benefits Administration Committee of not less
than three persons to hold office during the pleasure of the Corporation. No
compensation shall be paid members of the Committee from the Fund for service on
such Committee.

      The Committee shall choose from among its members a chairman and a
secretary. Any action of the Committee shall be determined by the vote of a
majority of its members. Either the chairman or the secretary may execute any
certificate or other written direction on behalf of the Committee.

      The Committee shall hold meetings upon such notice, at such place or
places and at such time or times as the Committee may from time to time
determine. Meetings may be called by the chairman or any two members. A majority
of the members of the Committee at the time in office shall constitute a quorum
for the transaction of business. The Committee may also act by written consent
in lieu of a meeting.

      A Committee member may resign at any time by giving written notice of his
resignation to the Corporation at least thirty days in advance, unless the
Corporation shall accept shorter notice. The Corporation shall appoint
replacement Committee members. Any Committee member who was employed by the
Employer when appointed to the Committee shall automatically be deemed to have
resigned from the Committee effective as of the date he ceases to be employed by
the Employer, unless the Corporation shall affirmatively act to keep said member
on the Committee.

      Nothing herein shall prevent a Committee member from being a Participant,
or from acting on Plan matters which affect himself by virtue of 

                                      -66-
<PAGE>


affecting all Participants generally. However, a Committee member shall not act
on any matter which affects himself specially. If application of the preceding
sentence results in there not being a quorum to act on any matter, the
Corporation shall appoint the necessary number of temporary Committee members to
take the action.

      In accordance with the provisions hereof, the Committee has been delegated
certain administrative functions relating to the Plan with all powers necessary
to enable it properly to carry out such duties.

      The Committee shall have discretionary authority to construe the Plan, and
to determine, consistent with the terms of the Plan, all questions that may
arise thereunder relating to (a) the eligibility of individuals to participate
in the Plan, (b) the amount of benefits to which any Participant or Beneficiary
may become entitled thereunder, and (c) any situation not specifically covered
by the provisions of the Plan. The determination of the Committee shall be final
and binding on all interested parties. All disbursements by the Trustee, except
for the ordinary expenses of administration of the Fund or the reimbursement of
reasonable expenses at the direction of the Corporation as provided herein,
shall be made upon, and in accordance with, the written directions of the
Committee. When the Committee is required in the performance of its duties
hereunder to administer or construe, or to reach a determination under any of
the provisions of the Plan, it shall do so on a uniform, equitable and
nondiscriminatory basis. 

8.6 Claims for Benefits

      All claims for benefits under the Plan shall be submitted to the Committee
which shall have the responsibility for determining the eligibility of any
Participant or Beneficiary for benefits. All claims for benefits shall be made
in writing and shall set forth the facts which such Participant or Beneficiary
believes to be sufficient to entitle him to the benefit claimed. The Committee
may adopt forms for the submission of claims for benefits in which case all


                                      -67-
<PAGE>

claims for benefits shall be filed on such forms. The Committee shall provide
Participants and Beneficiaries with all such forms.

      Upon receipt by the Committee of a claim for benefits, it shall determine
all facts which are necessary to establish the right of an applicant to benefits
under the provisions of the Plan and the amount thereof as herein provided. The
applicant shall be notified in writing by the Committee of its decision with
respect to such applicant's claim within 90 days after the receipt of written
request for benefits.

      If any claim for benefits is denied, the notice shall be written in a
manner calculated to be understood by the applicant and shall include:

      (a)   The specific reason or reasons for the denial;

      (b)   Specific references to the pertinent Plan provisions on which the
denial is based;

      (c) A description of any additional material or information necessary for
the applicant to perfect the claim and an explanation why such material or
information is necessary; and

      (d) An explanation of the Plan's claim review procedures. If special
circumstances require an extension of time for processing the initial claim, a
written notice of the extension and the reason therefor shall be furnished to
the claimant by the Committee before the end of the initial 90-day period. In no
event shall such extension exceed 180 days after the receipt of the initial
claim for benefits. 

8.7 Denial of Benefits - Review Procedure

      In the event a claim for benefits is denied or if the applicant has had no
response to such claim within 90 days of its submission (in which case the claim
for benefits shall be deemed to have been denied), the applicant or his duly
authorized representative, at the applicant's sole expense, may appeal the
denial by filing a written request for review with the Committee within 60 days
of the receipt of written notice of denial or 60 days from the date such claim
is deemed to be denied. In pursuing such appeal the applicant or his duly


                                      -68-
<PAGE>

authorized representative may review pertinent Plan documents, and may submit
issues and comments in writing.

      The decision on review shall be made by the Committee within 60 days of
receipt of the request for review, unless special circumstances require an
extension of time for processing, in which case a decision shall be rendered as
soon as possible, but not later than 120 days after receipt of a request for
review. If such an extension of time is required, written notice of the
extension shall be furnished to the claimant before the end of the original 60
day period. The decision on review shall be in writing, shall be written in a
manner calculated to be understood by the claimant, and shall include specific
references to the provisions of the Plan on which such denial is based. If the
decision on review is not furnished within the time specified above, the claim
shall be deemed denied on review. The decision of the Committee upon review will
be final and binding on all parties. 

8.8 Records

      All acts and determinations of the Committee shall be duly recorded by the
secretary thereof and all such records, together with such other documents as
may be necessary in exercising its duties under the Plan shall be preserved in
the custody of such secretary. Such records and documents shall at all times be
open for inspection and for the purpose of making copies by any person
designated by the Corporation. The Committee shall provide such timely
information, resulting from the application of its responsibilities under the
Plan, as needed by the Trustee and the accountant engaged on behalf of the Plan
by the Corporation, for the effective discharge of their respective duties. 

8.9 Missing Persons

      The Committee shall make a reasonable effort to locate all persons
entitled to benefits under the Plan. If such a person cannot be located, the
amount to which such a person otherwise would be entitled shall be retained by
the Trustee and treated in all 


                                      -69-
<PAGE>

respects as assets of the Trust, pending disposition of such amount in
accordance with regulations promulgated by the Secretary of Labor or the
Secretary of the Treasury. The Trustee may deposit any such amounts into an
"escheat fund" maintained by such Trustee but not within the Trust.



                                      -70-
<PAGE>



                                   ARTICLE IX
                      AMENDMENT AND TERMINATION OF THE PLAN

9.1  Amendment of the Plan

      The Corporation shall have the right at any time by action of the Board to
amend the Plan in whole or in part, including retroactively to the extent
necessary. The duties, powers and liability of the Trustee hereunder shall not
be increased without its written consent. The amount of benefits which at the
later of the adoption or effective date of such amendment shall have accrued for
any Participant or Beneficiary hereunder shall not be adversely affected
thereby. No such amendment shall have the effect of revesting in the Employer
any part of the principal or income of the Fund. No amendment may eliminate or
reduce any early retirement benefit or subsidy that continues after retirement
or optional form of benefit. Unless expressly provided for in an amendment, it
shall not affect the rights and obligations of any Participant who terminated
employment prior to the effective date of the amendment.

9.2  Termination of the Plan

      The Corporation expects to continue the Plan indefinitely, but continuance
is not assumed as a contractual obligation and each Employer reserves the right
at any time by action of its board of directors to terminate the Plan as
applicable to itself. If an Employer terminates or partially terminates the Plan
or permanently discontinues its Contributions at any time, each Participant
affected thereby shall be then fully vested in his Individual Account.

      In the event of termination of the Plan by an Employer, the Committee
shall value the Fund as of the date of termination. That portion of the Fund
applicable to any Employer for which the Plan has not been terminated shall be
unaffected. The Individual Accounts of the Participants and Beneficiaries
affected by the termination, as determined by the Committee, shall continue to
be administered as a part of the Fund or distributed to such Participants or


                                      -71-
<PAGE>

Beneficiaries pursuant to Section 5.6 as the Committee, in its sole discretion,
shall determine. Any distributions upon plan termination of amounts attributable
to Employee Pre-Tax Contributions shall only be made to the extent permissible
by Code Section 401(k)(10).



                                      -72-
<PAGE>



                                    ARTICLE X
              PROVISIONS RELATIVE TO EMPLOYERS INCLUDED IN PLAN

10.1  Method of Participation

      Any organization which is affiliated with the Corporation may with the
consent of the Board adopt the Plan. In order to adopt the Plan, appropriate
action is required by the board of directors (or other governing body) of the
adopting organization and by the Board. Any organization which becomes a party
to the Plan shall thereafter promptly deliver to the Trustee provided for in
Article VII hereof a certified copy of the resolutions or other documents
evidencing its adoption of the Plan or a similar plan and also a written
instrument showing the Board's approval of such organization's becoming a party
to the Plan.

10.2 Withdrawal

      Any one or more of the Employers included in the Plan may withdraw from
the Plan at any time by giving six months advance notice in writing to the Board
and the Committee (unless a shorter notice shall be agreed to by the Board) of
its or their intention to withdraw. Upon receipt of notice of any such
withdrawal, the Committee shall certify to the Trustee the equitable share of
such withdrawing Employer in the Fund (to be determined by the Committee).

      The Trustee shall thereupon set aside from the Fund then held by it such
securities and other property as it shall, in its sole discretion, deem to be
equal in value to such equitable share. If the Plan is to be terminated with
respect to such Employer, the amount set aside shall be dealt with in accordance
with the provisions of Section 9.2. If the Plan is not to be terminated with
respect to such Employer, the Trustee shall pay such amount to such trustee as
may be designated by such withdrawing Employer, and such securities and other
property shall thereafter be held and invested as a separate trust of the
Employer which has so withdrawn, and shall be used and applied according 

                                      -73-
<PAGE>


to the terms of a new agreement and declaration of trust between the Employer so
withdrawing and the trustee so designated.

      Neither the segregation of the Fund assets upon the withdrawal of an
Employer, nor the execution of any new agreement and declaration of trust
pursuant to any of the provisions of this Section 10.2, shall operate to permit
any part of the corpus or income of the Fund to be used for or diverted to
purposes other than for the exclusive benefit of Participants and Beneficiaries
or to defray reasonable costs of administering the Plan and Trust.

10.3 Adoption of ESOP by Participating Employer

Any Employer joining the Plan which is not 100 percent owned by the Employer
must expressly provide in said joiner agreement whether the leveraging
provisions of the ESOP are being adopted by such participating Employer. If the
leveraged ESOP is not so adopted, said participating Employer shall participate
in the ESOP provisions of this Plan as may be modified in said joiner agreement,
but all specific provisions applicable to Exempt Loans and the suspense account
established pursuant to the loan shall not apply. If the ESOP provisions of the
Plan are adopted by such a non-100 percent owned participating Employer, any
Exempt Loan applicable to said participating Employer and its Participants shall
be solely the obligation of said participating Employer, and not the Employer or
any other participating Employer under the Plan, and separate accounting shall
be maintained on behalf of said participating Employer and its Participants with
only Participants employed by said participating Employer entitled to
allocations from the fund maintained for said participating Employer's Exempt
Loan. The foregoing provisions governing separate Exempt Loans and separate
groups of Employees of non-100 percent owned participating Employers shall
similarly apply to an Exempt Loan of the Employer and its 100 percent owned
Participating Employers which join the Plan, and their respective Participants,
but for this purpose a 100 percent owned participating employer may, if so
provided in its joinder agreement, join in the Employer's Exempt Loan and in
such case all participating Employer 

                                      -74-
<PAGE>


contributions by the Employer and said Participating Employers and all
accounting for shares released from the suspense account shall be combined for
Participants employed by the Employer and each such participating Employer.



                                      -75-
<PAGE>



                                   ARTICLE XI
                              TOP-HEAVY PROVISIONS

11.1  Determination of Top-Heavy

      (a) (1) The Plan will be considered a Top-Heavy Plan for any Plan Year if
as of the Determination Date (A) the value of the Individual Accounts of
Participants who are Key Employees as of such Determination Date exceeds 60% of
the value of the Individual Accounts of all Participants determined as of such
Determination Date, excluding former Key Employees (the "60% Test") or (B) the
Plan is part of a Required Aggregation Group which is Top-Heavy. Notwithstanding
the results of the 60% Test, the Plan shall not be considered a Top-Heavy Plan
for any Plan Year in which the Plan is a part of a Required or Permissive
Aggregation Group which is not Top-Heavy.

            (2)   For purposes of the 60% Test,

                  (A) all distributions made from Individual Accounts within the
five-year period ending on the Determination Date shall be taken into account;

                  (B) if any Participant is a non-Key Employee with respect to
the Plan for any Plan Year, but such Participant was a Key Employee with respect
to the Plan for any prior Plan Year, the Individual Account of such Participant
shall not be considered; and

                  (C) If a Participant has not performed any service for the
Employer or any Affiliate which maintains the Plan at any time during the
five-year period ending on the Determination Date, the Individual Account of
such Participant shall not be considered.

      (b) Minimum Allocations: Notwithstanding Sections 4.3 and 4.4, for any
Plan Year during which the Plan is a Top-Heavy Plan, the rate of Employer
Matching Contributions and Discretionary Contributions for such Plan Year
allocated to the Individual Accounts of Participants who are non-Key Employees
and who remain employed by the Employer (or any Affiliate) at the end of the


                                      -76-
<PAGE>

Plan Year (regardless of any such Participant's hours of service or level of
compensation during the Plan Year) shall be not less than the lesser of:

            (1)   three percent (3%) of such non-Key Employee Participant's
Section 415 Compensation; or

            (2) the highest aggregate percentage of Section 415 Compensation at
which Employer Matching Contributions, Discretionary Contributions, and Employee
Pre-Tax Contributions are made (or required to be made) and allocated under
Article IV for any Key Employee for the Plan Year.

      If a Participant is covered by more than one defined contribution plan on
account of his employment with the Employer and/or any Affiliate, the minimum
allocation required by this Section shall be determined by aggregating the
allocations under all such plans.

      (c) (1) Notwithstanding Section 5.5, for any Plan Year in which the Plan
is a Top-Heavy Plan, a Participant who has earned at least one hour of service
during such Plan Year shall have a vested interest in those portions of his
Individual Account which are not automatically one hundred percent (100%)
vested, including allocations made to those portions of the Account in Plan
Years prior to the Plan becoming Top-Heavy, determined as follows:

- ---------------------------============================
 Years of Vesting Service        Vested Interest
- ---------------------------============================
            0                          0%
- ---------------------------============================
            1                          20%
- ---------------------------============================
            2                          40%
- ---------------------------============================
            3                          60%
- ---------------------------============================
        4 or more                     100%
=======================================================

            (2) If the Plan ceases to be a Top-Heavy Plan, the vesting rules set
forth in Section 5.5 shall again apply except that:


                                      -77-
<PAGE>


                  (A) any portion of a Participant's Individual Account that was
vested before the Plan ceased to be a Top-Heavy Plan shall remain vested, and

                  (B) any Participant with three or more years of service shall
have the option to continue to have his vested interest in those portions of his
Individual Account which are not automatically one hundred percent (100%) vested
determined under this Section 11.1(c).

      (d)   Impact on Minimum and Maximum Benefits where Employer Maintains
Both Defined Benefit and Defined Contributions Plans
            (1) Impact on Minimum. If the Employer (or any Affiliate) maintains
a defined benefit plan in addition to this defined contribution plan, both of
which are Top-Heavy, then:

                  (A) in the case of non-Key Employee participants covered only
by the defined benefit plan, the minimum benefit under the defined benefit plan
shall be provided; and

                  (B) in the case of non-Key Employee Participants not covered
by the defined benefit plan or covered by both plans, a minimum allocation of
five percent (5%) of such non-Key Employee Participant's Section 415
Compensation shall be provided. If a Participant is covered by more than one
defined contribution plan on account of his employment with the Employer and/or
any Affiliate, the minimum allocation required by this Section shall be
determined by aggregating the allocations under all such defined contributions
plans.

            (2)   Impact on Maximum.  If the Employer (or any Affiliate)
maintains a defined benefit plan in addition to this defined contribution
plan, both of which are Top-Heavy, Section 4.7 shall be read by substituting
the number "1.00" for the number "1.25" wherever it appears therein, unless
(A) the total aggregate accrued benefits under both such plans for Key
Employees does not exceed 90% of the total aggregate accrued benefits under
both such plans for all Employees (computed in the same manner as the
determination in 

                                      -78-
<PAGE>


subsection (a)), and (B)(i) paragraph (1) is read by substituting "seven and
one-half percent (7 1/2%)" for "five percent (5%)," and (ii) in the case of
non-Key Employee participants covered only by the defined benefit plan, a
minimum benefit of three percent (3%) for each year of service (not to exceed
10) shall be provided.

11.2  Top-Heavy Definitions

      Determination Date - With respect to any Plan Year, the last day of the
preceding Plan Year.

      Key Employee - Any Employee or former Employee who at any time during the
Plan Year containing the Determination Date, or the four preceding Plan Years,
is or was (1) an officer of the Employer having annual Section 415 Compensation
for such Plan Year which is in excess of 50 percent of the dollar limit in
effect under Code Section 415(b)(1)(A) for the calendar year in which such Plan
Year ends (but in no event shall the number of officers taken into account as
Key Employees exceed the lesser of (i) 50 or (ii) the greater of 3 or 10% of all
employees); (2) an owner of (or considered as owning within the meaning of Code
Section 318) both more than a 1/2 percent interest as well as one of the ten
largest interests in the Employer and having annual Section 415 Compensation
greater than the dollar limit in effect under Code Section 415(c)(1)(A) for such
Plan Year; (3) a five percent owner of the Employer; or (4) a one percent owner
of the Employer who has annual Section 415 Compensation of more than $150,000.
For purposes of determining five percent and one percent owners, neither the
aggregation rules nor the rules of subsections (b), (c) and (m) of Code Section
414 apply. Beneficiaries of an Employee acquire the character of the Employee
who performed services for the Employer. Also, inherited benefits will retain
the character of the benefits of the Employee who performed services for the
Employer. A non-Key Employee is any Employee who is not a Key Employee, or who
is a former Key Employee.

      Permissive Aggregation Group - Each employee pension benefit plan
maintained by the Employer (or any Affiliate) which is considered part of the

                                      -79-
<PAGE>


Required Aggregation Group, plus one or more other employee pension benefit
plans maintained by the Employer (or any Affiliate) that are not part of the
Required Aggregation Group but that satisfy the requirements of Section
401(a)(4) and Section 410 of the Code when considered together with the Required
Aggregation Group.

      Required Aggregation Group - Each employee pension benefit plan maintained
by the Employer (or any Affiliate), whether or not terminated, in which a Key
Employee participates in the Plan Year containing the Determination Date or any
of the four preceding Plan Years, and each other employee pension benefit plan
maintained by the Employer (or any Affiliate), whether or not terminated, in
which no Key Employee participates but which during the same period enables any
employee pension benefit plan in which a Key Employee participates to meet the
requirements of Section 401(a)(4) or Section 410 of the Code.



                                      -80-
<PAGE>



                                   ARTICLE XII
                                  MISCELLANEOUS

12.1  Governing Law

      The Plan shall be construed, regulated and administered according to the
laws of Massachusetts except in those areas preempted by the laws of the United
States of America. 

12.2 Construction

      The headings and subheadings in the Plan have been inserted for
convenience of reference only and shall not affect the construction of the
provisions hereof.  In any necessary construction the masculine shall include
the feminine and the singular the plural, and vice versa.

12.3  Administration Expenses

      The expenses of administering the Fund and the Plan may be paid either
by the Employer or from the Fund, as directed by the Corporation.

12.4  Participant's Rights; Acquittance

      No Participant in the Plan shall acquire any right to be retained in the
Employer's employ by virtue of the Plan, nor, upon his dismissal, or upon his
voluntary termination of employment, shall he have any right or interest in and
to the Fund other than as specifically provided herein. The Employer shall not
be liable for the payment of any benefit provided for herein. All benefits
hereunder shall be payable only from the Fund.

12.5 Spendthrift Clause

      Except as provided by a qualified domestic relations order within the
meaning of ERISA Section 206(d)(3), none of the benefits, payments, proceeds, or
distributions under this Plan shall be subject to the claim of any creditor of a
Participant or a Beneficiary hereunder or to any legal process by any creditor
of a Participant or Beneficiary. Neither a Participant or Beneficiary shall have
any right to alienate, commute, anticipate, or assign any of the benefits,
payments, proceeds or distributions under this Plan.


                                      -81-
<PAGE>


12.6  Merger, Consolidation or Transfer

      In the event of the merger or consolidation of the Plan with another plan
or transfer of assets or liabilities from the Plan to another plan, each then
Participant or Beneficiary shall not, as a result of such event, be entitled on
the day following such merger, consolidation or transfer under the termination
of the Plan provisions to a lesser benefit than the benefit he was entitled to
on the day prior to the merger, consolidation or transfer if the Plan had then
terminated.

12.7  Mistake of Fact

      Notwithstanding anything herein to the contrary, upon the Employer's
request, a Contribution which was made by a mistake of fact, or conditioned upon
initial qualification of the Plan or upon the deductibility of the Contribution
under Code Section 404, may be returned to the Employer by the Trustee within
one (1) year after the payment of the Contribution, the denial of the
qualification or the disallowance of the deduction (to the extent disallowed),
whichever is later. For purposes of the preceding sentence, all contributions to
the Plan made before receipt of a favorable determination letter on
qualification from the Internal Revenue Service shall be conditioned on the
Plan's initial qualification, and all contributions, whenever made, shall be
conditioned on their deductibility under Code Section 404.

12.8  Counterparts

      The Plan and the Trust Agreement may be executed in any number of
counterparts, each of which shall constitute but one and the same instrument
and may be sufficiently evidenced by any one counterpart.

12.9  Transitional Rule

      Notwithstanding any provision in this Plan to the contrary, no
contribution by or on behalf of any Participant shall be made under this Plan
for any period during which any contribution by or on behalf of such Participant
is made while such Participant is a participant in a Merged Plan.



                                      -82-
<PAGE>



                                  ARTICLE XIII
                              ADOPTION OF THE PLAN

      Anything herein to the contrary notwithstanding, this amended and restated
Plan is adopted and maintained under the condition that it is qualified by the
Internal Revenue Service under Code Section 401(a) and that the Trust hereunder
is exempt under Code Section 501(a).
      As evidence of its adoption of the restated Plan, Covance Inc. and the
participating employers have caused this instrument to be signed by its
authorized officer this ___ day of __________, 199__, effective as of
________________, except as otherwise provided herein.



Covance Inc. hereby signifies its adoption of this Plan.


ATTEST:                       COVANCE INC. (f/k/a Corning Pharmaceutical
                                  Services Inc.


____________________________  By:___________________________________(SEAL)
                              (Title)


                              Date:__________________________________


Covance Preclinical Corporation Inc. hereby signifies its adoption of this
Plan.


ATTEST:                       COVANCE PRECLINICAL CORPORATION
                              (f/k/a HazletonCorporation)


___________________________   By:__________________________________(SEAL)
                              (Title)





                                      -83-
<PAGE>



      Covance Clinical and Periapproval Services Inc. hereby signifies its
adoption of this Plan.


ATTEST:                 COVANCE CLINICAL AND PERIAPPROVAL SERVICES INC.
                         (f/k/a Corning Besselaar, Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)

      Covance Clinical Research Unit Inc., a wholly-owned subsidiary of
Covance Clinical and Periapproval Services Inc., hereby signifies its
adoption of this Plan.


ATTEST:                       COVANCE CLINICAL RESEARCH UNIT INC.
                              (f/k/a Corning Besselaar Clinical Research
Unit, Inc.)


___________________________   By:_______________________________________(SEAL)
Secretary                     (Title)

                              ------------------------------------------------
                              (Date)



                                      -84-
<PAGE>

      Covance Periapproval Services Inc., a wholly-owned subsidiary of
Covance Clinical and Periapproval Services Inc., hereby signifies its
adoption of this Plan.


ATTEST:                       COVANCE PERIAPPROVAL SERVICES INC.
                              (f/k/a Corning Pact, Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)

      Covance Laboratories Inc., a wholly-owned subsidiary of Covance
Preclinical Corporation, hereby signifies its adoption of this Plan.


ATTEST:                       COVANCE LABORATORIES INC.
                              (f/k/a Corning Hazleton Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)


      Covance Research Products Inc., a wholly-owned subsidiary of Covance
Preclinical Corporation, hereby signifies its adoption of this Plan.


ATTEST:                       COVANCE RESEARCH PRODUCTS INC.
                                (f/k/a HRP, Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)
                                      -85-

<PAGE>

      Covance Pharmaceutical Packaging Services Inc. hereby signifies its
adoption of this Plan.


ATTEST:                 COVANCE PHARMACEUTICAL PACKAGING SERVICES INC.
                        (f/k/a Corning National Packaging, Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)



      Covance Central Laboratory Services Inc.  hereby signifies its adoption
of this Plan.


ATTEST:                       COVANCE CENTRAL LABORATORY SERVICES INC.
                              (f/k/a Corning Scicor, Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)

                                      -86-
<PAGE>


      Covance Health Economics and Outcome Services Inc. hereby signifies its
adoption of this Plan.


ATTEST:           COVANCE HEALTH ECONOMICS AND OUTCOME SERVICES INC.
                  (f/k/a Corning HTA Inc.)


___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)



      Covance Biotechnology Services Inc., hereby signifies its adoption of this
Plan.


ATTEST:                       COVANCE BIOTECHNOLOGY SERVICES INC.



___________________________   By:_______________________________________(SEAL)
                              (Title)

                              ------------------------------------------------
                              (Date)


                                      -87-
<PAGE>


      Covance Central Laboratory Limited Partnership (d/b/a Covance Central
Laboratory Services Inc. f/k/a Corning SciCor Limited Partnership), hereby
signifies its adoption of this Plan.


ATTEST:                 COVANCE CENTRAL LABORATORY LIMITED PARTNERSHIP
                        (d/b/a Covance Central Laboratory Services Inc.
                        f/k/a Corning SciCor Limited Partnership)



___________________________   By:_______________________________________(SEAL)
Secretary                     (Title)

                              ------------------------------------------------
                              (Date)








                                      -88-
<PAGE>



                                  Supplement A
                                       TO
                         THE STOCK PURCHASE SAVINGS PLAN
                                       OF
                                  COVANCE INC.

                      EMPLOYEE STOCK OWNERSHIP PLAN (ESOP)

A-1 Purpose. The purpose of this Supplement A to the Plan is to set forth the
terms of the Plan as applied to the portion of the ESOP attributable to Exempt
Loans as described in subsection A-4.

A-2   Effective Date.  The effective date of this Supplement A is December
31, 1996.

A-3 Participation. Each Participant in the Plan on the Effective Date of this
Supplement A shall immediately become a Participant in this Supplement A. Every
other person who thereafter becomes a Participant in the Plan shall at the same
time become a Participant in this Supplement A.

A-4 Exempt Loan. Any loan to the Plan or Trust not prohibited by section 4975(c)
of the Code, including a loan which meets the requirements set forth in section
4975(d)(3) of the Code and the regulations promulgated thereunder, the proceeds
of which are used to finance the acquisition of ESOP Stock or to refinance such
a loan. An Exempt Loan shall be for a specific term, shall bear a reasonable
rate of interest and shall not be payable on demand except in the event of
default. An Exempt Loan may be secured by a pledge of the financed shares so
acquired (or acquired with the proceeds of a prior Exempt Loan which is being
refinanced). No other Trust Fund assets may be pledged as collateral for an
Exempt Loan, and no lender shall have recourse against Trust Fund assets other
than any financed shares remaining subject to pledge. If the lender is a party
in interest (under ERISA), the Exempt Loan must provide for a 


                                       A1
<PAGE>


transfer of Trust Fund assets on default only upon and to the extent of the
failure of the Trust to meet the payment schedule of the Exempt Loan. Any pledge
of financed shares must provide for the release of the shares so pledged as
payments on the Exempt Loan are made by the Trustee and such financed shares are
allocated to Participants' accounts. Payments of principal on any Exempt Loan
shall be made by the Trustee (as directed by the Committee) only from Employer
contributions paid in cash under the Plan to enable the Trust to repay such
Exempt Loan, from earnings attributable to such Employer contributions and from
any cash dividends received by the Trust on such financed shares or dividends on
such other shares of Employer Stock as is permitted under Code section 404(k).

A-5 Investment of Exempt Loan Proceeds. The Employer may direct the Trustee to
enter into one or more Exempt Loans to finance the acquisition of ESOP Stock.
Proceeds from an Exempt Loan may be used to acquire ESOP Stock from the
Employer's shareholders or directly from the Employer. If such shares are
purchased from the Employer, no commission may be charged with respect thereto
and the sale price shall not be more than the fair market value thereof, defined
for this purpose with respect to the Employer's common stock to be said common
stock's New York Stock Exchange (or other national stock exchange) closing price
on the first business day immediately preceding the date of sale. There shall be
no limit on the amount of stock of the Employer which may be held at any one
time by the Trustee in the Trust Fund regardless of the percentage which such
stock so held bears to the assets of the Trust Fund or to the outstanding shares
of stock of the Employer or for any other reason.

Notwithstanding any other provision of the Plan, all proceeds of an Exempt Loan
shall be used, within a reasonable time after receipt by the Trust Fund, for the
following purposes:



                                       A2
<PAGE>

      (a) To acquire ESOP Stock;

      (b) To repay the same Exempt Loan; or

      (c) To repay any previous Exempt Loan.

ESOP Stock acquired by the Trust Fund through an Exempt Loan shall be initially
maintained in a Suspense Account and shall thereafter be released from suspense
and allocated to Participants' ESOP Accounts as hereinafter provided.

A-6 Supplement A Cash Equivalents Fund. All cash dividends on Employer Stock
held in a Suspense Account which are not allocated to Participants' accounts or,
in the case of allocated shares, which the Employer directs are to be used to
make payments on Exempt Loans and all Employer Matching Contributions required
under Section A-7 shall be credited to the Supplement A Cash Equivalents Fund
pending their application to Exempt Loan payments. Except as provided under
Section 7.5, all such dividends and all earnings of the Supplement A Cash
Equivalents Fund shall be used to make principal payments on outstanding Exempt
Loans to the extent then due. In the event that the amount of such dividends and
earnings exceeds the amount of principal payable on that date, the excess shall
be applied until exhausted to interest payable on that date, and principal and
interest payments due thereafter. Notwithstanding the preceding sentences of
Section A-6, in lieu of making payments on outstanding Exempt Loans, the
Committee may direct that all or any amount of cash dividends received with
respect to Employer Stock allocated to participants' accounts shall be credited
proportionately to such Participants' Accounts pending investment in the
Employer Stock Fund. Any amount that is applied to make a payment on an
outstanding Exempt Loan after the last day of a plan year (the "prior plan
year"), but on or before the due date (including extensions thereof) for the
filing of the federal income tax return of the Employer for the tax year in
which the last day of such prior 


                                       A3
<PAGE>

plan year occurs, may be designated by the employers as a payment with respect
to such prior plan year.

A-7 Coordination with Employer Contributions. For each Plan Year the Employer
shall make contributions under this Section A-7 which, after taking into account
the use of dividends and earnings in accordance with Section A-6, are sufficient
to meet all scheduled payments of principal and interest on outstanding Exempt
Loans. Employer contributions under Sections 3.2 (matching) and 3.3
(discretionary) shall be applied against payments on any Exempt Loan to the
extent the Committee in its sole discretion shall determine and ESOP Stock shall
then be released. An Employer's obligations to contribute under Sections 3.2 and
3.3 shall be reduced for such month by the fair market value as of the date of
release of the ESOP Stock so released or otherwise allocated as below provided.
To the extent said fair market value is less than said Employer's obligations
under Sections 3.2 and 3.3 for any such month, the Employer shall make further
contributions to the Trust Fund to fully meet said obligations. For each Plan
Year, if for a calendar month the fair market value as of the date of release of
the shares so released is in excess of the Employer's obligations to contribute
under Sections 3.2 and 3.3 for such month, the shares released for said month
representing the excess ("excess shares") shall continue to be held by the
Trustee and shall thereafter be allocated to the Participants' Employer Matching
Accounts in the following manner: first, if in a succeeding calendar month
within said Plan Year, the fair market value of the shares so released for said
month are less than the Employer's obligations to contribute under Sections 3.2
and 3.3 for said month, then "excess shares" remaining unallocated for any prior
calendar month in said Plan Year shall be allocated to the Participants'
Matching Contribution Accounts to the extent that said Employer obligations
exceed the value of the released shares, and for this purpose said "excess
shares" to be so allocated shall be valued at the same value as the value of the
shares released for said month; and second, if as of the last day of the Plan
Year there remain 

                                       A4
<PAGE>


"excess shares" which have not been allocated to Participants' Matching
Contribution Accounts as aforesaid, said "excess shares" shall be allocated as
of the last day of the Plan Year to the Participants' Matching Contribution
Accounts, as the Committee may determine in its sole discretion on a
year-to-year basis, in direct proportion to the value (determined as of the date
allocated to the Participants' Matching Contribution Accounts) of those shares
released and allocated to the Fund so determined by the Committee, together with
all other Employer contributions to Participants' Matching Contribution Accounts
for said Plan Year. In addition to the foregoing contributions, in any Plan
Year, the Employers may make supplemental contributions to be used by the
Trustee to prepay any Exempt loan, to pay expenses of the Plan and any related
trust and to satisfy the dividend requirements for that year with respect to
Employer Stock allocated to Participants' Employer Matching Accounts. All
Employer Matching Contributions shall be used to make payments on Exempt Loans
to the extent required to meet any scheduled payments of principal and interest
after taking into account the use of dividends and earnings in accordance with
Section A-6.

A-8 Release of Employer Stock From Suspense Account. As of the last day of each
Plan Year, of each calendar quarter in the case of the Employer Stock allocable
for the year as dividend replacements under paragraph A-9(a), or of such other
period provided under the terms of an Exempt Loan, throughout the duration of an
Exempt Loan, a portion of the Employer Stock acquired with the proceeds of such
Exempt Loan shall be withdrawn from the Suspense Account and allocated to
eligible Participants' Matching Contribution Accounts in accordance with the
provisions of Section A-9.

            (a) Subject to the provisions of paragraph (b) below, the number of
            shares of Employer Stock which shall be released from the Suspense
            Account for any plan year (calculated separately with respect to
            each Exempt Loan) shall be equal to the product of:

                                       A5
<PAGE>

                        (i)   the number of shares of Employer Stock acquired
                  with the proceeds of the Exempt Loan

                                  Multiplied by

                        (ii) a fraction, the numerator of which is the amount of
                  principal and interest paid on that loan for that Plan Year
                  and the denominator of which is the amount of principal and
                  interest paid or payable on that loan for that Plan Year and
                  for all future years.

                  For purposes of determining the fraction in (ii), if the
            interest rate under the Exempt Loan is variable, the interest rate
            to be paid in future months shall be assumed to be equal to the
            interest rate applicable as of the applicable month.

          (b)  Notwithstanding the provisions of paragraph (a) above, if
               provided by the terms of an Exempt Loan or directed by the
               Committee prior to the first payment of interest on any Exempt
               Loan, the number of shares of Employer Stock attributable to such
               Exempt Loan which are withdrawn from the Suspense Account for any
               Plan Year shall be proportionate to principal payments only,
               provided that:

               (i)   such withdrawal is consistent with the provisions of the
                     Exempt Loan with respect to the release of Employer Stock
                     as collateral, if any, for such loan;

               (ii)  the Exempt Loan provides for annual payments of principal
                     and interest at a cumulative rate that is not less rapid at
                     any

                                       A6
<PAGE>


                     time than level annual payments of such amounts for ten
                     years;

               (iii) interest is disregarded for purposes of determining such
                     release only to the extent that it would be determined to
                     be interest under standard loan amortization tables; and

               (iv)  the term of the ESOP Loan, together with any renewal,
                     extension or refinancing thereof, does not exceed ten
                     years.

          (c)  Notwithstanding the foregoing, in the event such Exempt Loan
               shall be repaid with the proceeds of a subsequent Exempt Loan
               (the "Substitute Loan"), such repayment shall not operate to
               release all such ESOP Stock in the suspense account, but, rather,
               such release shall be effected pursuant to the foregoing
               provisions of this Section on the basis of payments of principal
               and interest on such Substitute Loan.


          (d)  If at any time there is more than one Exempt Loan outstanding,
               then separate Suspense Accounts may be established for each such
               Loan. Each Exempt Loan for which a separate Suspense Account is
               maintained may be treated separately for purposes of the
               provisions governing the release of ESOP Stock from suspense
               under this Section and for purposes o the provisions governing
               the application of Employer contributions to repay an Exempt
               Loan.

A-9 Allocation and Crediting of Employer Stock to Employer Match Accounts and
Application to Plan Limitations. Employer Stock released from the Suspense
Account during any Plan Year shall be allocated and credited as follows:

                                       A7
<PAGE>

          (a)  To the extent that dividends on Employer Stock previously
               allocated to the Individual Account of a Participant have been
               used to make payments on an Exempt Loan, such account shall be
               credited with Employer Stock with a fair market value determined
               as of the last day of the month preceding the month of the
               dividend payment date equal to the amount of such dividend.

          (b)  As of each calendar month, any Employer Stock released from the
               Suspense Account during the Plan Year ending on that date and not
               credited in accordance with paragraph (a) shall be credited to
               the Employer Matching Accounts of eligible Participants pursuant
               to Section 4.3, in order to satisfy the obligation under Section
               3.2.

          (c)  For purposes of Section 4.6 of the Plan, Employer Matching
               Contributions for any Plan Year which are utilized to make any
               payment of principal or interest on an Exempt Loan shall be
               deemed to have been allocated among Participants in the same
               ratios as the number of shares of Employer Stock released from
               the Suspense Account as credited in accordance with paragraph (b)
               above, without regard to the value of the Employer Stock released
               from the Suspense Account.

          (d)  All Employer Stock allocated to Participants in accordance with
               paragraph (b) above shall be treated as Employer Matching
               Contributions for purposes of Section 3.2 and as "Matching
               Contributions" for purposes of section 401(m) of the Internal
               Revenue Code.

          (e)  It is intended that the provisions of this Supplement A shall be
               applied and construed in a manner consistent with the


                                       A8
<PAGE>


               requirements and provisions of Treasury Regulations 
               54.4975-7(b) (8), and any successor regulation thereto. The
               number of shares allocable to a Participant's Matching
               Contribution Account shall be the number of shares which bears
               the same ratio to the total shares released for such month and
               allocable to the contribution made by or on behalf of such
               Participant by his participating Employer under Sections 3.2 and
               3.3 for such month bears to the total Employer contributions
               under Sections 3.2 and 3.3 made on behalf of all such
               Participants for such month, provided, however, that the fair
               market value of the shares so allocated as of the date of such
               allocation shall not exceed the Employer's obligation to
               contribute under such Sections on behalf of such Participant for
               such month, and any shares in excess of said participating
               Employer obligations ("excess shares") for all Participants are
               to be then allocated as described above in Section A-7.

          (f)  Notwithstanding the foregoing provisions of this Section, if more
               than one-third of the total allocations to Participants' accounts
               with respect to a Plan Year would be allocated in the aggregate
               to the accounts of Highly Compensated Employees and attributable
               to the Employer Matching Contribution allocated to Employer
               Stock, then the allocations to the accounts of Highly Compensated
               Employees shall be reduced, pro rata, in an amount sufficient to
               reduced the amounts allocated to the accounts of such
               Participants to an amount not in excess of one-third of the total
               allocations to Participants' accounts with respect to such Plan
               Year and any shares of Employer Stock which are prevented from
               being allocated due to said restriction shall be allocated as
               though Highly Compensated Employees did not participate in the
               Plan.



                                       A9
<PAGE>

A-10 Diversification Election By Participants. A Qualified Participant is
eligible to elect a diversification of Employer Stock under the conditions
specified in Section 2.6.

A-11 Put Option. Employer Stock acquired with the proceeds of an Exempt Loan
must be subject to a put option, if at the time of its distribution it is either
subject to a trading limitation, or is not publicly traded. For purposes of this
paragraph (b), a "trading limitation" on a security is a restriction under any
Federal or state securities law, any regulation thereunder, or an agreement, not
prohibited by Treasury regulations Section 54.4975-7(b) affecting the security
so as to make the security not as freely tradable as one not subject to such a
restriction. The put option must be exercisable only by a Participant, a
Beneficiary or by any donee of the Participant or by a person to whom the
security passes by reason of a Participant's death. The put option must permit a
Participant to put the security to the Corporation, and it may grant the trust
an option to assume the rights and obligations of the Corporation at the time
that the put option is exercised, but under no circumstances may the put option
bind the Trust. If it is known at the time an Exempt Loan is made that Federal
or state law will be violated by the Corporation's honoring such a put option,
the put option must permit the security to be put, in a manner consistent with
such law, to a third party (for example but without limitation, to an Affiliate
or a shareholder other than the Trust) that has substantial net worth at the
time the Exempt Loan is made and whose net worth is reasonably expected to
remain substantial. A put option must be exercisable at any time during a period
or periods which include at least (A) sixty (60) days beginning on the date the
security subject to the put option is distributed by the Trustee and (B) sixty
(60) days in the next following Plan Year, in accordance with regulations issued
pursuant to Section 409 of the Code. In the case of a security that is publicly
traded without restriction when distributed, but ceases to be so traded within
the put option period(s) set forth above, the Corporation must notify each
security holder in writing on or 


                                      A10
<PAGE>


before the tenth (10th) day after the date the security ceases to be so traded
that during the remainder of such period(s) the security is subject to put
option. The number of days between such tenth (10th) day and the date on which
notice is actually given, if later than the tenth (10th) days, must be added to
the duration of the put option. The notice must inform distributees of the terms
of the put options that they are to hold. The price at which a put option must
be exercisable is the value of the security, as determined under Treasury
Regulations Section 54.4975-11(d)(5). The provisions for payment under a put
option must provide that the Corporation or the Trust if the Plan so elects,
shall repurchase the Employer Securities as follows:

      (A)  If the distribution constitutes a total distribution within the
           meaning of Section 409(h)(5) of the Code, payment of the fair
           market value of the repurchased Employer Securities shall be made
           in five (5) substantially equal annual payments, of which the
           first shall be paid not later than thirty (30) days after the
           Participant exercises the put option.  The purchaser will pay a
           reasonable rate of interest and provide adequate security on
           amounts not paid after thirty (30) days;

      (B)  If the distribution does not constitute a total distribution, the
           purchaser shall pay the Participant an amount equal to the fair
           market value of the Employer Stock repurchased no later than thirty
           (30) days after the Participant exercises the put option.



                                      A11
<PAGE>


                                  SUPPLEMENT B
                                       TO
               THE STOCK PURCHASE SAVINGS PLAN OF COVANCE INC.

                 SUPPLEMENTAL LIST OF PARTICIPATING EMPLOYERS


Participating Employer                     Formerly Known As
Covance Inc. (Parent)                      Corning Pharmaceutical Services
                                           Inc.

Covance Clinical and Periapproval          Corning Besselaar Inc.
Services Inc.
      Covance Clinical Research Unit Inc.  Corning Besselaar Clinical
                                           Research Unit Inc.
      Covance Periapproval Services Inc.   Corning Pact Inc.

Covance Preclinical Corporation            Hazleton Corporation
      Covance Laboratories Inc.            Corning Hazleton Inc.
      Covance Research Products Inc.       HRP Inc.

Covance Central Laboratory Services Inc.   Corning SciCor Inc.
      Covance Central Laboratory Limited   Corning SciCor Limited Partnership
      Partnership (dba Covance Central
      Laboratory Services Inc.)

Covance Pharmaceutical Packaging Services  Corning National Packaging Inc.
Inc.

Covance Health Economics and Outcome       Corning HTA Inc.
Services Inc.

Covance Biotechnology Services Inc.        Corning Bio Inc.


                                      B1
<PAGE>

                 THE STOCK PURCHASE SAVINGS PLAN OF COVANCE INC.


                                 AMENDMENT NO. 1

            In accordance  with the powers  reserved to it in Section 9.1 of The
Stock  Purchase  Savings Plan of Covance  Inc.,  amended and restated  effective
December 31, 1996 (the "Plan"),  Covance Inc.  hereby amends the Plan  effective
January 1, 1997 as follows:

            1.     Section 9.1 is deleted in its entirety and replaced with
                  the following:

            "7.6  Voting and Tender Offer Rights on Employer Stock

            Each Participant shall have the right to vote all shares of Employer
            Stock held in the  Participant's  accounts.  Each Participant  shall
            also have the right to direct the  Trustee  whether  to tender  such
            shares  of Stock in the event an offer is made by any  person  other
            than the Employer to purchase such shares.  The Committee shall make
            any such arrangements with the Trustee as may be appropriate to pass
            such voting or tender offer rights through to a Participant.  In the
            event a Participant fails to vote his shares, the Trustee shall vote
            the  Participant's  shares  in the same  proportions  as those  Plan
            Participants  who did  respond  cast  their  votes.  In the  event a
            Participant  fails to  indicate  his  preference  with  respect to a
            tender offer,  the Trustee shall not tender his shares.  The Trustee
            shall also vote and exercise any tender offer rights with respect to
            unallocated  ESOP  Stock  held in a  suspense  account  in the  same
            proportions  as those Plan  Participants  who  responded  cast their
            votes or tendered their shares."

            2.     Section 12.1 is deleted in its entirety and replaced with
                  the following:

            "12.1 Governing Law

            The Plan shall be construed, regulated and administered according to
            the laws of the state of New Jersey except in those areas  preempted
            by the laws of the United States of America."


                                       B2
<PAGE>


                        To record the adoption of this Amendment No. 1 to the
            Plan, Covance Inc. has authorized its officers to affix its name
            and seal this________day of _____________, 1997.




[SEAL]                                    COVANCE  INC.



Attest:  ___________________________            By:  ___________________________


<PAGE>



                                  COVANCE INC.


RESOLVED, that, pursuant to Section 9.1 of The Stock Purchase Savings Plan of
Covance Inc., amended and restated effective December 31, 1996 (the "Plan"), the
Board of Directors of Covance Inc. may amend the Plan at any time, the Company
adopts Amendment No. 1 to the Plan, effective January 1, 1997, substantially in
the form attached hereto.

FURTHER RESOLVED, that, in the event of a tender offer to purchase the Company's
stock, the Trustee of the Plan shall not tender any shares that are allocated to
a participant's account unless the participant instructs the Trustee to tender
such shares.

FURTHER RESOLVED, that, the Plan shall be governed by the laws of the state of
New Jersey except to the extent that such laws are preempted by federal law.

FURTHER RESOLVED, that, the proper officers of the Company are hereby authorized
and directed to take any action as may be necessary or appropriate, in the
opinion of counsel, to effectuate the intent of the foregoing resolutions.







                                    


                                  COVANCE INC.
                          EMPLOYEE STOCK PURCHASE PLAN

            The  Covance  Inc.  Employee  Stock  Purchase  Plan (the  "Plan") is
intended to provide the eligible  employees of Covance  Inc.  (the  "Company") a
convenient  means of purchasing  shares of the Company's common stock, par value
$.01 per share (the "Stock").  As initially adopted, the Plan is not intended to
qualify as an "employee  stock  purchase plan" under section 423 of the Internal
Revenue  Code of 1986,  as amended (the  "Code").  The Company may in the future
determine  that the Plan should  qualify  under section 423 of the Code. At such
time,  the Company  shall  re-adopt  the Plan as a Code section 423 Plan and the
Plan will then be administered, interpreted and construed in a manner consistent
with the requirements of section 423 of the Code. Specifically, Article X of the
Plan shall not become  effective until the Company  re-adopts the Plan as a Code
section 423 Plan.

                                    ARTICLE I
                                   DEFINITIONS

            1.1 "Account" Means The Bookkeeping Account Established On Behalf Of
Each Participant By The Committee To Record Payroll Deduction Contributions Made
By Such Participant And Shares Of Stock Purchased On His Behalf.

            1.2    "Board" means the Board of Directors of the Company.

            1.3  "Business  Day"  means  each  day on which  the New York  Stock
Exchange is open for business.

            1.4  "Compensation"  means all regular  salary,  wages or  earnings,
including  overtime,  commissions  and bonuses and amounts  that would have been
treated as taxable wages but for their  exclusion  under Code section  401(k) or
125,  but  excluding   amounts  realized  from  the  exercise  of  qualified  or
non-qualified stock options, severance payments and reimbursement of expenses.

            1.5 "Committee"  means the committee  appointed  pursuant to Article
VIII to administer the Plan.

            1.6 "Employee"  means any person who is employed by the Company on a
full-time  basis or a  part-time  basis  consisting  of at  least  20  regularly
scheduled  hours per week. For the purpose of determining  whether an individual
is an Employee,  the  definition  of Company  shall also  include the  Company's
subsidiaries, if any, as defined under Code section 424(f).


                                      -1-
<PAGE>


            1.7    "Effective Date" means January 1, 1997.

            1.8    "Entry Date" means the first date of any Offering Period.

            1.9  "Offering  Commencement  Date" means the first  Business Day of
each Offering Period.

            1.10 "Offering Period" means each calendar quarter,  or such shorter
period that the Committee may prescribe.

            1.11 "Offering Termination Date" means the last Business Day of each
Offering Period.

            1.12  "Participant"  means an Employee  who has met the  eligibility
requirements  of Article II and who has  elected to  participate  pursuant to an
election under Section 3.1.

            1.13   "Plan Year" means the 12-month period ending December 31.

            1.14  "Shares"  means shares of Stock that have been  allocated to a
Participant's Account.

                                   ARTICLE II
                                   ELIGIBILITY

      2.1  Eligibility.  Except as provided in Section 2.2, all  individuals who
are Employees  shall be eligible to participate in the Plan as of the Entry Date
which coincides with or next follows the date on which the individual  became an
Employee.

      2.2  Eligibility  Restrictions.  An  Employee  shall  not be  eligible  to
participate  in the Plan for any period of time  during  which he is employed by
the  Company or any  subsidiary  outside of the United  States if he is not paid
from the Company's United States payroll during that time.

                                   ARTICLE III
                                  PARTICIPATION

      3.1  Commencement  of  Participation.  An eligible  Employee  may become a
Participant  in the Plan on any  Entry  Date by  completing  an  enrollment  and
payroll  deduction  form and  delivering  it to the Company in  accordance  with
procedures established by the Committee.

      3.2 Payroll Deduction.  At the time a Participant files his enrollment and
payroll  deduction  form, he shall elect to have after-tax  deductions made from
his 

                                      -2-
<PAGE>

Compensation in an amount stated as a whole percentage of his  Compensation,
ranging from one percent (1%) to ten percent (10%).

      3.3   Participants'   Accounts.   All  payroll   deductions  made  from  a
Participant's Compensation shall be credited to his Account and used to purchase
shares of Stock in  accordance  with  Article  V.  Contributions  credited  to a
Participant's  Account shall not accrue  interest or earnings  during the period
prior to being used to purchase shares of Stock in accordance with Article V.

      3.4  Changes  in  Payroll  Deductions.  The  percentage  designated  by  a
Participant as his rate of  contribution  under Section 3.2 shall  automatically
apply to increases and decreases in his Compensation. A Participant may elect to
change the rate of his  contributions to any rate permissible  under Section 3.2
at any time in accordance with the procedures established by the Committee.

                                   ARTICLE IV
                                    OFFERINGS

      4.1  Offerings.  The Plan shall be  implemented  through  offerings of the
Company's  Stock made at the  beginning of each Offering  Period.  Each Offering
Period  shall  begin on the  Offering  Commencement  Date and  shall  end on the
Offering Termination Date.

      4.2   Purchase Price.  The "Purchase Price" per share of Stock with
respect to each Offering Period shall be the lesser of:

                        4.2.1  Eighty-five  (85) percent of the mean between the
                  highest and lowest quoted  selling  prices of the Stock on the
                  New York Stock Exchange (or on such other national  securities
                  exchange upon which the Stock may then be listed,  hereinafter
                  referred to as the  "Exchange")  on the  Offering  Termination
                  Date,  or if no sale of  Stock  occurred  on  such  date,  the
                  official closing price on the preceding Business Day; or

                        4.2.2.  Eighty-five (85) percent of the mean between the
                  highest and lowest quoted  selling  prices of the Stock on the
                  Exchange on the Offering  Commencement  Date, or if no sale of
                  Stock occurred on such date, the official closing price on the
                  preceding Business Day.

      4.3 Maximum Offering. The maximum number of shares of Stock which shall be
issued under the Plan,  subject to adjustment upon changes in  capitalization of
the Company as provided in Section 9.3, shall be 1,000,000  shares. If the total
number of shares which would be purchased during any Offering Period exceeds the
maximum  number  of  available  shares,  the  Committee  shall  make a pro  rata
allocation  of the  available  shares  in a  manner  that  it  determines  to be
equitable  and 


                                      -3-
<PAGE>

the balance of payroll deductions credited to the Accounts of Participants shall
be returned to such Participants as soon as administratively practicable.

                                    ARTICLE V
                                PURCHASE OF STOCK

      5.1  Automatic   Exercise.   On  each  Offering   Termination  Date,  each
Participant  shall  automatically  and  without any act on his part be deemed to
have purchased  Stock to the full extent of the payroll  deductions  credited to
his Account during the Offering Period ending on such Offering Termination Date.

      5.2   Fractional Shares.  Fractional shares of Stock may be purchased
under the Plan.

      5.3 Acquisition of Stock.  The Company may acquire Stock for use under the
Plan from authorized but unissued shares, treasury shares, in the open market or
in privately negotiated transactions.

      5.4 Accounting for Purchased Stock. All shares of Stock purchased pursuant
to Section 5.1 shall be  allocated  as Shares to the  appropriate  Participant's
Account as of the Offering Termination Date on which such shares are purchased.

                                   ARTICLE VI
                                   ACCOUNTING

      6.1 General.  The  Committee  shall  establish  procedures  to account for
payroll  deductions  made by a  Participant,  the  number  of  Shares  of  Stock
purchased  on a  Participant's  behalf and the number of Shares  allocated  to a
Participant's Account.

      6.2  Allocation  of Stock.  Shares of Stock  allocated to a  Participant's
Account  shall be  registered  in the name of the Company or its nominee for the
benefit of the Participant on whose behalf such shares were purchased.

      6.3 Accounting for Distributions. Shares of Stock distributed or sold from
a  Participant's  Account  shall be  debited  from  his  Account  on a  first-in
first-out basis.

      6.4 Account Statements.  Each Participant shall receive at least quarterly
statements  of all  payroll  deductions  and  shares of Stock  allocated  to his
Account together with all other transactions affecting his Account.

                                   ARTICLE VII
                          WITHDRAWALS AND DISTRIBUTIONS


                                      -4-
<PAGE>


      7.1 Withdrawal of Shares.  A Participant  may elect to withdraw any number
of Shares  allocated to his Account by providing  notification to the Company in
accordance   with   procedures   established  by  the  Committee.   As  soon  as
administratively  practicable following notification of a Participant's election
to withdraw  Shares,  the Committee shall cause a certificate  representing  the
number of Shares to be withdrawn to be delivered to the Participant.

      7.2  Distribution  Upon  Termination.  When a Participant  terminates  his
employment with the Company, any payroll deductions allocated to his Account and
not yet applied to purchase  Stock in accordance  with Section 5.1 shall be used
to purchase Stock on the next Offering Termination Date that immediately follows
his termination of employment. As soon as administratively practicable following
that  Offering   Termination  Date,  a  certificate   representing  all  of  the
Participant's Shares shall be distributed to him (or his executor,  in the event
that he is not alive on the date of distribution).


                                      -5-
<PAGE>



                                  ARTICLE VIII
                                 ADMINISTRATION

      8.1  Appointment  of  Committee.  The Board shall  appoint a Committee  to
administer  the Plan,  which shall consist of no fewer than three  members.  The
Board may from time to time appoint members to the Committee in substitution for
or in addition to members previously  appointed and may fill vacancies,  however
caused, in the Committee.

      8.2 Authority of Committee.  The Committee  shall have the exclusive power
and authority to administer the Plan, including without limitation the right and
power to interpret the provisions of the Plan and make all determinations deemed
necessary or advisable  for the  administration  of the Plan.  All such actions,
interpretations  and  determinations  which are done or made by the Committee in
good  faith  shall  be  final,  conclusive  and  binding  on  the  Company,  the
Participants  and all other  parties and shall not subject the  Committee to any
liability.

      8.3 Committee  Procedures.  The Committee may select one of its members as
its  Chairman  and shall hold its  meetings at such times and places as it shall
deem advisable and may hold telephone meetings.  A majority of its members shall
constitute a quorum.  All  determinations  of the  Committee  shall be made by a
majority of its members.  Any decision or  determination  reduced to writing and
signed by a majority of the members of the Committee shall be as fully effective
as if it had been made by a majority vote at a meeting duly called and held. The
Committee may appoint a secretary and shall make such rules and  regulations for
the conduct of its business as it shall deem advisable.

      8.4 Expenses.  The Company will pay all expenses incident to the operation
of the Plan,  including the costs of recordkeeping,  accounting fees, legal fees
and the costs of delivery of stock certificates to Participants.

                                   ARTICLE IX
                                  MISCELLANEOUS

      9.1   Transferability.   Neither   payroll   deductions   credited   to  a
Participant's  Account nor any rights with regard to the purchase of Stock under
the Plan may be assigned,  transferred,  pledged or otherwise disposed of in any
way by  the  Participant  other  than  by  will  or  the  laws  of  descent  and
distribution.

      9.2 Status as Owner.  Each Participant  shall be deemed to legally own all
shares of Stock  allocated  to his Account and shall be entitled to exercise all
rights associated with ownership of the shares,  including,  without limitation,
the right to vote such  shares in all  matters  for which  Stock is  entitled to
vote, receive dividends,  if any, and tender such shares in response to a tender
offer.


                                      -6-
<PAGE>


      9.3  Adjustment  Upon  Changes  in  Capitalization.  In  the  event  of  a
reorganization,  recapitalization,  stock split, spin-off, split-off,  split-up,
stock dividend, combination of shares, merger, consolidation or any other change
in the  corporate  structure of the Company,  or a sale by the Company of all or
part of its assets, the Board may make appropriate adjustments in the number and
kind of shares which are subject to purchase  under the Plan and in the exercise
price applicable to outstanding options.

      9.4 Amendment  and  Termination.  The Board shall have complete  power and
authority to  terminate or amend the Plan,  including  without  limitation,  the
power and  authority  to make any  amendment  that may be  deemed to affect  the
interests  of any  Participant  adversely.  The Plan and all rights of Employees
hereunder shall  terminate:  (i) at any time, at the discretion of the Board, in
which case any cash balance in Participants'  Accounts shall be refunded to such
Participants  as  soon as  administratively  possible;  or (ii) on the  Offering
Termination Date on which  Participants  become entitled to purchase a number of
shares of Stock that exceeds the maximum  number of shares  available  under the
Plan.

      9.5 No  Employment  Rights.  The Plan does not,  directly  or  indirectly,
create in any Employee any right with respect to  continuation  of employment by
the  Company  and it  shall  not be  deemed  to  interfere  in any way  with the
Company's  right to  terminate,  or otherwise  modify,  an  Employee's  terms of
employment at any time.

      9.6 Withholding.  To the extent any payments or  distributions  under this
Plan are subject to Federal,  state or local taxes, the Company is authorized to
withhold  all  applicable   taxes.  The  Company  may  satisfy  its  withholding
obligation  by (i)  withholding  shares of Stock  allocated  to a  Participant's
Account,  (ii) deducting cash from a Participant's  Account,  or (iii) deducting
cash from a  Participant's  other  compensation.  A  Participant's  election  to
participate  in the Plan  authorizes  the  Company  to take  any of the  actions
described in the preceding sentence.

      9.7 Holding of Funds.  The Company  shall not be obligated to hold payroll
deductions made under the Plan in trust or to otherwise segregate such amounts.

      9.8 Choice of Law.  Except to the extent  superseded  by Federal  law, the
laws of the State of New Jersey will govern all matters relating to the Plan.


                                    ARTICLE X
                                CODE SECTION 423

      This  Article  X  shall  become  effective  only  if the  Board  adopts  a
resolution providing that this Plan is intended to qualify as an "employee stock
purchase plan" 

                                      -7-
<PAGE>

under Code section 423. Such  resolution  shall state the date that this Section
shall become effective.

      10.1 Restrictions on Participation.  Notwithstanding any provisions of the
Plan to the contrary,  no Employee  shall be granted an option to participate in
the Plan under the following conditions:

            10.1.1         No   Employee   shall  be   granted   an  option  if,
                           immediately  after the grant, such Employee would own
                           stock,  and/or hold  outstanding  options to purchase
                           stock,  possessing  5% or more of the total  combined
                           voting  power or value of all classes of stock of the
                           Company (for purposes of this paragraph, the rules of
                           ss.424(d)  of the Code  shall  apply  in  determining
                           stock ownership of any Employee); or

            10.1.2         No Employee  shall be granted an option which permits
                           his rights to  purchase  Stock under the Plan and all
                           other  employee stock purchase plans (as described in
                           section  423 of the Code) of the Company to accrue at
                           a rate which exceeds  $25,000 of fair market value of
                           such  Stock  (determined  at the time such  option is
                           granted) for each  calendar year in which such option
                           is  outstanding  at any time.  For  purposes  of this
                           Section 10.1.2:

                           10.1.2.1 the right to purchase  stock under an option
                           accrues  when the  option  (or any  portion  thereof)
                           first becomes exercisable during the calendar year;

                           10.1.2.2 the right to purchase  stock under an option
                           accrues at the rate provided in the option, but in no
                           case may such  rate  exceed  $25,000  of fair  market
                           value of such  stock  (determined  at the  time  such
                           option is granted) for any one calendar year; and

                           10.1.2.3 a right to purchase  stock which has accrued
                           under one option  granted  pursuant a plan may not be
                           carried over to any other option.

      10.2 Amendment of Plan.  The Board shall not,  without the approval of the
shareholders  of the Company (i) increase the maximum number of shares which may
be offered  under the Plan  (except  pursuant to Section  9.3);  (ii) modify the
requirements  as to eligibility for  participation  in the Plan; or (iii) in any
other way cause the Plan to fail the requirements of section 423 of the Code.

      10.3 Shareholder Approval.  The Plan must be approved by a majority of the
shareholders  of the Company within 12 months  following the date that the Board


                                      -8-
<PAGE>

re-adopts the Plan as a Plan intended to qualify as an "employee  stock purchase
plan" under Code section 423.

                               *   *   *   *   *

            To record the adoption of the Plan, Covance Inc. has caused its
authorized officers to affix its Corporate name and seal this _____ day of
           , 1996.


[CORPORATE SEAL]                                  COVANCE INC.




Attest:____________________                       By:_________________________

                                      -9-





                                                                   For Review By
                                                                   Legal Counsel


                                 Covance Inc.

                    Supplemental Executive Retirement Plan



                           Effective January 1, 1997


<PAGE>


                               TABLE OF CONTENTS



                                                                            Page

ARTICLE I     INTRODUCTION...................................................1

ARTICLE II    DEFINITIONS....................................................1
      2.1     Accrued Benefit................................................1
      2.2     Actuarial Equivalent...........................................1
      2.3     Board..........................................................2
      2.4     Change In Control..............................................2
      2.5     Code...........................................................2
      2.6     Committee......................................................2
      2.7     Covance Inc. ..................................................2
      2.8     Disability.....................................................2
      2.9     Final Average Earnings.........................................2
      2.10    Participant....................................................3
      2.11    Plan...........................................................3
      2.12    Plan Compensation..............................................3
      2.13    Plan Year......................................................3
      2.14    Year of Service................................................3

ARTICLE III   PARTICIPATION..................................................3
      3.1     Eligibility to Participate.....................................3
      3.2     Commencement of Participation..................................4

ARTICLE IV    AMOUNT OF PENSION BENEFITS.....................................4
      4.1     Normal Retirement Benefits.....................................4
      4.2     Early Retirement...............................................4
      4.3     Late Retirement................................................5
      4.4     Service Crediting..............................................5

ARTICLE V     VESTING........................................................5
      5.1     Vesting of Benefits............................................5

ARTICLE VI    DEATH PRIOR TO RETIREMENT......................................6
      6.1     Pre-Retirement Death Benefits for Married Participants.........6
      6.2     Death Benefits for Unmarried Participants......................6



<PAGE>


ARTICLE VII   PAYMENT OF BENEFITS............................................6
      7.1     Retirement.....................................................6
      7.2     Termination of Employment......................................6
      7.3     Forfeiture of Benefits.........................................7
      7.4     Facility of Payment............................................7
      7.5     Change In Control..............................................7

ARTICLE VIII  AMENDMENTS AND TERMINATION.....................................8
      8.1     Amendments Generally...........................................8
      8.2     Right to Terminate.............................................8
      8.3     No Funding Obligation..........................................9

ARTICLE IX    ADMINISTRATION AND INTERPRETATION..............................9
      9.1     Interpretation.................................................9
      9.2     Payment of Expenses...........................................10
      9.3     Indemnification for Liability.................................10
      9.4     Claims Procedure..............................................11
      9.5     Review Procedure..............................................11

ARTICLE X     MISCELLANEOUS PROVISIONS......................................11
      10.1    Right of Covance Inc. . to Take Employment Actions............11
      10.2    Alienation or Assignment of Benefits..........................12
      10.3    Applicable Law................................................12
      10.4    Number and Gender.............................................12
      10.5    Accelerated Distributions.....................................12



<PAGE>


                                  Covance Inc.
                     SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN


                                    ARTICLE I
                                  INTRODUCTION

In  recognition  of the services  provided to Covance Inc. by certain of its key
executives, the Board of Directors of Covance Inc. establishes this Supplemental
Executive Retirement Plan for the purpose of providing  supplemental  retirement
income  for  each  selected  individual.  It is to be  maintained  and  operated
according to the terms of this document. The Compensation Committee of the Board
of  Directors  of  Covance  Inc.  shall  have the sole  authority  to manage and
administer this Plan.

                                   ARTICLE II
                                   DEFINITIONS

As used  herein,  the  following  words  and  phrases  shall  have the  meanings
described below:      
      2.1  Accrued  Benefit  Benefit  shall mean the  amount of pension  benefit
payable as a single life annuity as shall be considered earned at any time for a
Participant  in  accordance  with the  provisions  of Article IV.  Such  pension
benefit  shall be  payable in the form  chosen by the  Participant  pursuant  to
Article VII.
      2.2 Actuarial Equivalent shall mean a lump sum benefit of equivalent value
based on the  applicable  mortality  rates,  set back one year,  and 120% of the
applicable  interest  rate,  both as published by the Pension  Benefit  Guaranty
Corporation  for  purposes  of  determining  the  present  value  of a lump  sum
distribution on plan termination. Such lump sum


                                       1
<PAGE>

benefit
shall be determined  as of the first day of the year prior to the  Participant's
date of retirement or other  termination  of employment  occurs.  Application of
such  assumptions to the computation of benefits payable under the Plan shall be
made uniformly and consistently with all respect to the Plan.
      2.3  Board shall mean the Board of Directors of CovanceInc.
      2.4  Change In  Control shall mean a change in the
control of Covance Inc.  that shall be deemed to have occurred upon the earliest
to occur  of the  following:  (i) the date  Covance  Inc.  becomes  a party to a
merger,  consolidation,  or sale of substantially all of its assets or any other
corporate  reorganization  in  which  Covance  Inc.  will  not be the  surviving
corporation,  or in which  the  holders  of  Covance  Inc.  stock  will  receive
securities of another  corporation (ii) the purchase by an individual,  or group
of  individuals  acting in  concert,  of at least  thirty  percent of the voting
securities  of Covance  Inc.  or (iii)  during  any  twenty-four  month  period,
individuals who at the beginning of such period  constituted the Board cease for
any reason to constitute a majority thereof.
      2.5 Code shall mean the  Internal  Revenue  Code of 1986,  as amended from
time to time.
      2.6 Committee  shall  mean the  Compensation  Committee  of the  Board of
Directors.
      2.7 Covance Inc. shall mean Covance Inc., a Delaware  Corporation  and any
successor thereto.
      2.8 Disability  shall mean a disability  qualifying  for benefits  payable
under the Covance Inc. long-term  disability plan under which the Participant is
covered.
      2.9 Final  Average  Earnings  shall  mean the  average  of the sum of the
Participant's monthly Plan Compensation during the sixty (60) consecutive


                                       2
<PAGE>

calendar  months (or the total  number of months if less than sixty)  within the
one hundred twenty (120) months (or the total number of months if less than 120)
immediately  preceding the Participant's  termination of employment with Covance
Inc., in which his Plan Compensation was the highest.  In the case of a disabled
Participant, who is receiving disability benefits under any long term disability
insurance provided by Covance Inc., his Final Average Earnings shall be computed
based on his Plan  Compensation  immediately  prior to becoming  disabled.  
      2.10  Participant  shall mean an individual  who has been  designated as a
Participant  in this  Plan  under  Section  3.1.  In the  event of the  death or
incompetency of a Participant,  the term shall mean his personal  representative
or guardian.
      2.11 Plan shall mean the Covance Inc.  Supplemental  Executive  Retirement
Plan set forth in this  document  and as amended by  Covance  Inc.  from time to
time.
      2.12 Plan Compensation shall mean the base salary paid to a Participant by
Covance Inc.  (including  salary  reductions  which are deferred  under  Section
401(k) or 125 of the Code), plus annual bonuses.
      2.13 Plan Year shall mean the calendar year.
      2.14 Year of Service shall mean a Participant's  total Years of Service as
an employee of Covance Inc.,  including  service  completed with Corning and any
affiliated employer of Covance Inc. or Corning.

                                   ARTICLE III
                                  PARTICIPATION

      3.1  Eligibility  to  Participate.   Any  individual   designated  by  the
Compensation  Committee  of the Board shall be eligible to  participate  in this
Plan. The Compensation Committee of the Board may delegate the authority


                                       3
<PAGE>

to  designate  eligible   employees  to  the  Chief  Executive   Officer.   Plan
Participants  shall be  limited  to a  select  group of  management  and  highly
compensated employees of Covance Inc.

      3.2 Commencement of  Participation.  Each individual who has satisfied the
requirements  of  Section  3.1  shall  commence  participation  in the plan upon
designation by the  Compensation  Committee of the Board as a Participant in the
plan.

                                  ARTICLE IV
                           AMOUNT OF PENSION BENEFITS

      4.1 Normal Retirement  Benefits. A Participant who retires on or after the
completion of 20 Years of Service shall have an Accrued  Benefit equal to 40% of
his Final Average Earnings payable on the attainment of age 60.  Notwithstanding
the foregoing,  a Participant  employed with Covance Inc. on January 1, 1997 who
completes 15 Years of Service shall have an Accrued  Benefit equal to 40% of his
Final Average Earnings.
      A Participant who retires or terminates employment prior to the completion
of 20 Years of Service  shall have his Accrued  Benefit  reduced  proratably  by
dividing the number of completed Years of Service by 20; provided,  however,  in
the case of such a Participant employed by Covance Inc.
on January 1, 1997, the divisor shall be 15.
      A  Participant  who becomes  Disabled  will  continue  to accrue  Years of
Service  until  the  earlier  of  age  60  or   distribution   commencement.   A
Participant's  benefits  determined  under this  Section  shall be  adjusted  in
accordance  with  Section  4.2 or Section  4.3 if his  Accrued  Benefit  becomes
payable at other than his attainment of age 60.
      4.2 Early Retirement.  A Participant who has been credited with five Years
of Service and has attained age 55 may, with Committee approval, 4

<PAGE>

elect to retire  before  becoming  eligible for normal  retirement  benefits.  A
Participant who elects to


                                       5
<PAGE>




retire and commence benefit payments prior to the attainment of age 60, shall be
subject to a  reduction  in his  Accrued  Benefit of 5% of the amount of Accrued
Benefit for each year  payment of  benefits  occurs  prior to the  Participant's
attainment of age 60.
      4.3 Late  Retirement.  A  Participant  who elects to retire  and  commence
benefit  payments  after age 60 will be  entitled  to an increase in his Accrued
Benefit of 5% of the amount of Accrued  Benefit for each year  benefit  payments
are delayed beyond age 60. A Participant's Accrued Benefit will not be increased
for benefit payments that commence after age 65.
      4.4 Service  Crediting.  Service for purposes of determining the amount of
Accrued  Benefit and vesting  shall be credited  under this Plan for all service
completed with Covance Inc., Corning and any affiliated employer of Covance Inc.
or Corning. In addition,  a Participant may be granted, at the discretion of the
Committee,  prior service  credit for Years of Service with a previous  employer
for the purposes of determining his Accrued  Benefit and vesting.  The Committee
shall  credit  such  service  in  writing  at  the  time  of  the  Participant's
commencement  of  participation  in this Plan and shall  have the  authority  to
require a reduction or offset of the  Participant's  Accrued  Benefit under this
Plan by the amount of any retirement  benefit provided to the Participant  under
the plan or plans of the  previous  employer for which prior  service  credit is
given.

                                    ARTICLE V
                                     VESTING

      5.1 Vesting of  Benefits.  A  Participant  shall become 100% vested in his
Accrued Benefit as of the earlier of Disability,  or the crediting of five Years
of Service.




                                       6
<PAGE>


                                   ARTICLE VI
                            DEATH PRIOR TO RETIREMENT

      6.1 Pre-Retirement Death Benefits for Married  Participants.  In the event
of the death of a married  Participant  whose  death  occurs  while still in the
employ of Covance Inc. and after the  completion  of five Years of Service,  his
surviving  spouse  shall be  entitled to receive an amount in the form of a lump
sum payment which shall be fifty  percent  (50%) of the Actuarial  Equivalent of
the Accrued  Benefit the  Participant  would have been eligible to receive under
Section 4.1 adjusted in accordance with Sections 4.2 or 4.3, if applicable,  had
he retired on the day before his death.  Such  payment  will  commence as of the
date the  Participant  would  have  attained  age 55,  or if  later,  as soon as
administratively feasible after the Participant's death.
      6.2   Death Benefits for Unmarried Participants.  No death benefits
shall be payable under this Plan in the event of the death of an unmarried
Participant.

                                   ARTICLE VII
                               PAYMENT OF BENEFITS

      7.1 Retirement.  A Participant  shall, upon his retirement,  in accordance
with  Article IV, be entitled to receive his Accrued  Benefit in the form of one
of the  following:  a single life annuity  payable  monthly,  quarterly or on an
annual  basis;  a lump sum  equal to the  Actuarial  Equivalent  of the  Accrued
Benefit,  calculated in accordance  with Section 2.2; or a joint and 50% or 100%
survivor annuity  actuarially  reduced to reflect the joint life expectancies of
the Participant and his spouse.
      7.2   Termination of Employment.  A Participant who chooses to
voluntarily terminate his employment with Covance Inc. prior to the
completion 

                                       7
<PAGE>

of 5 Years of Service shall forfeit any Accrued Benefit.


                                       8
<PAGE>




      7.3 Forfeiture of Benefits.  Notwithstanding  anything herein contained to
the contrary,  no payment of any retirement benefits hereunder shall be made and
all rights under this Plan shall be forfeited if the  Compensation  Committee of
the Board unanimously determines that any of the following events occur:
            (a)   The Participant is convicted of a felony or misdemeanor if
such misdemeanor involves moral turpitude;
            (b) The  Participant  has committed  any act of gross  negligence or
intentional misconduct in the performance or non-performance of his duties as an
employee of the Company,  including  any such actions  which  constitute  sexual
harassment under applicable laws, rules or regulations;
            (c) The Participant is not disabled (as defined below),  but refuses
or fails to perform the duties and services specified herein for a period of not
less than thirty (30) days;
            (d)  The   Participant   has  committed  or   participated   in  the
misappropriation of Company assets or personal dishonesty which causes financial
or reputational harm with respect to the Company.
      7.4  Facility  of  Payment.  Whenever,  in  the  Committee's  opinion,  an
individual  entitled to receive any  payment of a benefit  hereunder  is under a
legal disability or is incapacitated in any way so as to be unable to manage his
financial affairs, Covance Inc. may make payments to the legal representative of
such  person or to a relative  or friend of such  individual  for his benefit or
apply the payment  for the benefit of such  individual  as the  Committee  deems
advisable.

      7.5  Change In  Control.  In the event of a Change in  Control  of Covance
Inc., each  Participant in this Plan as of the date of the Change in Control who
is involuntarily or constructively terminated during the three-year



                                       9
<PAGE>


period  following the Change in Control shall be credited with three  additional
Years of Service  and three  additional  years of age for  Accrued  Benefit  and
vesting determination purposes;  provided,  however, that such additional credit
for these Participants shall be reduced by the period of service and increase in
age the Participant has completed and experienced  between the Change in Control
and actual termination of employment.

                                  ARTICLE VIII
                           AMENDMENTS AND TERMINATION

      8.1  Amendments  Generally.  The Committee  reserves the right to make any
amendment  or  amendments  to this Plan from time to time which do not cause any
reduction  in a  Participant's  Accrued  Benefit  at the time the  amendment  is
adopted or the  effective  date of the  amendment,  whichever  is  earlier.  Any
amendment  shall  be  made  pursuant  to  a  duly  adopted   resolution  of  the
Compensation Committee of the Board.
      8.2  Right to  Terminate.  The  Compensation  Committee  of the  Board may
terminate  the Plan at any time in  whole  or in part.  Termination  of the Plan
shall  be  made  pursuant  to a duly  adopted  resolution  of  the  Compensation
Committee of the Board. In the event of termination,  the Compensation Committee
of the Board may, at its option,  pay each  Participant the present value of his
Accrued Benefit at the time of termination of the Plan and make such payments in
an actuarially  equivalent lump sum. In addition,  the Compensation Committee of
the Board may, at its option,  refrain from making  payments to any  Participant
until such time and in such manner as he would have been entitled to receive his
Accrued  Benefit  under  the  terms  of the  Plan as in  effect  on the  date of
termination.  Notwithstanding the foregoing, if the Plan terminates within three
years of a Change in Control, each Participant will be paid the present value of
his Accrued  Benefit  immediately.  No  termination  of 


                                       10
<PAGE>

the  Plan  shall  reduce  a  Participant's  Accrued  Benefit  as of the  date of
termination.
      8.3 No  Funding  Obligation.  The  obligation  of  Covance  Inc.to pay any
benefits  under this Plan shall be unfunded and  unsecured;  any payments  under
this Plan shall be made from the general  assets of Covance  Inc.  However,  the
Board, in its discretion,  may authorize the  establishment  of a rabbi trust or
any other funding  vehicle it deems  appropriate in order to set aside assets to
discharge its obligations under this Plan.

                                   ARTICLE IX
                        ADMINISTRATION AND INTERPRETATION

      9.1 Interpretation. The Committee may take any action, correct any defect,
supply any omission or reconcile any inconsistency in the Supplemental Executive
Retirement Plan, or in any election  hereunder,  in the manner and to the extent
it shall deem necessary to carry the Supplemental Executive Retirement Plan into
effect or to carry out the Board's  purposes in adopting the Plan. Any decision,
interpretation  or  other  action  made  or  taken  in good  faith  by or at the
direction of Covance Inc.,  the Board,  or the  Committee,  arising out of or in
connection with the Supplemental  Executive Retirement Plan, shall be within the
absolute  discretion  of all and each of them,  as the case may be, and shall be
final,  binding and conclusive on Covance Inc., and all  Participants  and their
respective  heirs,  executors,  administrators,   successors  and  assigns.  The
Committee's  determinations  hereunder  need  not be  uniform,  and  may be made
selectively among Participants,  whether or not they are similarly situated. Any
actions to be taken by the  Committee  will require the consent of a majority of
the Committee  members.  If a member of the  Committee is a Participant  in this
Supplemental  Executive Retirement Plan, such member may not decide or determine
any matter or question concerning his benefits under this Supplemental Executive
Retirement Plan that such member would not have the

                                       11
<PAGE>

right to decide or determine if he were not a member.



                                       12
<PAGE>


      9.2  Payment  of  Expenses.  Covance  Inc.,  in  such  proportions  as the
Committee  determines,  shall  bear  all  expenses  incurred  by them and by the
Committee in  administering  this Plan. If a claim or dispute arises  concerning
the rights of a Participant or Beneficiary to amounts  deferred under this Plan,
regardless of the party by whom such claim or dispute is initiated, Covance Inc.
shall (in such proportions as between Covance Inc. as the Committee determines),
and upon presentation of appropriate vouchers, pay all legal expenses, including
reasonable   attorneys'   fees,   court  costs,   and  ordinary  and   necessary
out-of-pocket costs of attorneys, billed to and payable by the Participant or by
anyone claiming under or through the Participant  (such person being hereinafter
referred to as the "Participant's  Claimant"),  in connection with the bringing,
prosecuting,  defending,  litigating,  negotiating, or settling of such claim or
dispute; provided, that:
      (a) The Participant or the  Participant's  Claimant shall repay to Covance
Inc. any such  expenses  theretofore  paid or advanced by Covance Inc. if and to
the extent that the party disputing the Participant's  rights obtains a judgment
in its favor from a court of competent  jurisdiction from which no appeal may be
taken,  whether  because the time to do so has expired or  otherwise,  and it is
determined by the court that such expenses were not incurred by the  Participant
or the Participant's Claimant while acting in good faith; provided further, that
      (b) In the case of any claim or dispute  initiated by a Participant or the
Participant's  Claimant,  such claim  shall be made,  or notice of such  dispute
given, with specific  reference to the provisions of this Plan, to the Committee
within two years (three  years,  in the event of a Change in Control)  after the
occurrence of the event giving rise to such claim or dispute.
      9.3 Indemnification for Liability. Covance Inc.shall indemnify the members
of the  Committee,  against any and all claims,  losses,  damages,  expenses and
liabilities  arising from their  responsibilities  in connection with this Plan,
unless  the  same  is  determined  to be  due to  gross  negligence  or  willful


                                       13
<PAGE>

misconduct.
      9.4 Claims Procedure.  If a claim for benefits or for participation  under
this Plan is denied in whole or in part,  a  Participant  will  receive  written
notification.  The  notification  will include  specific reasons for the denial,
specific  reference to pertinent  provisions of this Plan, a description  of any
additional  material or information  necessary to process the claim and why such
material or  information  is necessary,  and an explanation of the claims review
procedure.  If the  Committee  fails to  respond  within  90 days,  the claim is
treated as denied.
      9.5 Review Procedure.  Within 60 days after the claim is denied or, if the
claim is deemed denied,  within 150 days after the claim is filed, a Participant
(or his duly  authorized  representative)  may file a written  request  with the
Committee for a review of his denied claim. The Participant may review pertinent
documents that were used in processing his claim,  submit  pertinent  documents,
and address issues and comments in writing to the Committee.  The Committee will
notify the  Participant of its final decision in writing.  In its response,  the
Committee will explain the reason for the decision,  with specific references to
pertinent  Plan  provisions  on which the decision was based.  If the  Committee
fails to respond to the request for review within 60 days, the review is treated
as denied.

                                    ARTICLE X
                            MISCELLANEOUS PROVISIONS

      10.1 Right of Covance Inc. to Take  Employment  Actions.  The adoption and
maintenance of this Supplemental  Executive  Retirement Plan shall not be deemed
to constitute a contract between Covance Inc. and any eligible Participant,  nor
to be a consideration  for, nor an inducement or condition of, the employment of
any person.  Nothing herein contained,  or any action taken hereunder,  shall be
deemed to give any eligible  Participant  the right to be retained in the employ
of Covance Inc. or to interfere with the right of Covance



                                       14
<PAGE>

Inc. to discharge any eligible  Participant  at any time, nor shall it be deemed
to give to an Employer the right to require the eligible  Participant  to remain
in its employ, nor shall it interfere with the eligible  Participant's  right to
terminate his or her employment at any time.  Nothing in this Plan shall prevent
Covance Inc. from amending,  modifying,  or  terminating  any other Covance Inc.
benefit plan.
      10.2  Alienation  or Assignment of Benefits.  A  Participant's  rights and
interest under the Supplemental  Executive Retirement Plan shall not be assigned
or transferred except as otherwise provided herein, and the Participant's rights
to benefit payments under the Supplemental  Executive  Retirement Plan shall not
be subject to  alienation,  pledge or  garnishment  by or on behalf of creditors
(including  heirs,  beneficiaries,  or  dependents)  of the  Participant or of a
Beneficiary.   Notwithstanding   the   preceding,   the   Committee  may  direct
distributions to an alternate payee pursuant to a Qualified  Domestic  Relations
Order (QDRO), as defined in Section 414(p) of the Code prior to any distribution
date described in Article IV.
      10.3  Applicable  Law.  This  Plan  shall be  construed  and  enforced  in
accordance  with the laws of  Delaware  except to the extent  superseded  by the
Employee Retirement Income Security Act of 1974, as amended.
      10.4 Number and Gender. Whenever any words used herein are in the singular
form,  they shall be  construed as though they were also used in the plural form
in all cases where they would so apply,  and references to the male gender shall
be construed as  applicable  to the female  gender  where  applicable,  and vice
versa.
      10.5 Accelerated Distributions. In the event Federal income is accelerated
on the  value of  future  prospective  benefits  due to a  determination  by the
Internal  Revenue  Service,  the  Participant  may at his  election  receive  an
immediate  distribution  of the amount  necessary to pay the tax  obligation due
currently.  The Participant's  Accrued Benefit under the Plan will be reduced to
reflect the accelerated distribution.



                                       15






                                  Covance, Inc.


- ----------------------------------------------------------------------------
                                  Covance, Inc.
                              Restricted Share Plan
- ----------------------------------------------------------------------------




                 Established by the Company in General Meeting
                                     on [ ]

<PAGE>

                                  Covance, Inc.

                              Restricted Share Plan


                                    CONTENTS


Rule                                                                  Page No.

1. DEFINITIONS...............................................................1
2. GRANT OF AWARDS...........................................................5
3. CONDITIONS RELATING TO THE GRANT OF AWARDS................................7
4. RIGHTS OF AWARD HOLDER DURING VESTING PERIOD..............................8
5. LAPSE OF AWARDS...........................................................9
6. TERMINATION OF VESTING PERIOD AND LAPSE OF AWARDS.........................9
7. RELEASE OF RESTRICTED SHARES.............................................10
8. ISSUE OF SHARES..........................................................11
9. DISCRETION AS TO FORM OF PAYMENT.........................................11
10. ADJUSTMENTS.............................................................12
11. ADMINISTRATION..........................................................12
12. ALTERATIONS.............................................................13
13. GENERAL.................................................................14
APPENDIX A1.................................................................15
APPENDIX A2.................................................................16
APPENDIX B:  1996 ALLOCATION................................................17

<PAGE>

   Rules of the Covance, Inc. Restricted Share Plan

1.    DEFINITIONS
      In this Plan, the following words and expressions shall, where the context
      so permits, have the meanings set forth below:

      "the Auditors"                the auditors for the time being of the
                                    Company acting as experts and not as
                                    arbitrators;

      "Award"                       an award of Restricted Shares pursuant to
                                    the Plan;

      "Award Certificate"           a certificate issued under Rule 2.4;

      "Award Holder"                a person to whom an Award has been granted
                                    (or as the context requires, his personal
                                    representatives);

      "Base Compensation"           the annual rate of salary of an Eligible
                                    Employee, excluding bonuses and benefits
                                    in-kind;

      "Committee"                   the Compensation Committee of the board of
                                    directors of the Company that administers
                                    the Plan;

      "the Company"                 Covance, Inc. (Covance);


<PAGE>


      "Date of Grant"               the date as of  which  an  Award is  granted
                                    under the Plan  pursuant to Rule 2, which is
                                    December 31 of each  calendar  year,  or the
                                    1996 calendar year, 15 January 1997 shall be
                                    used for  purposes of  computing  the Market
                                    Value of Shares;

      "the Committee"               the board of Committee of the Company or a
                                    duly authorized committee thereof;

      "Eligible Employee"           any person who is a US Eligible Employee or
                                    an International Eligible Employee;

      "Group"                       the Company and its Subsidiaries and `member
                                    of the Group' shall be construed
                                    accordingly;

      "International Eligible       any person who is a director or employee
       Employee"                    of an International Participating Company;

      "International Participating  a member of the Group, which the Committee
       Company"                     has designated to participate in
                                    the Plan as an International Participating
                                    Company; Appendix A(1) lists the
                                    International Participating Companies at the
                                    date of establishment of the Plan;

<PAGE>


      "Market Value"                in  relation to a Share on any Date of Grant
                                    is the daily-weighted  average quotation for
                                    such  Share on the New York  Stock  Exchange
                                    over the five  business days starting on the
                                    Date  of  Grant  and in  relation  to the US
                                    dollar/local  currency unit exchange rate is
                                    the rate on the Date of Grant as reported by
                                    the Wall Street Journal;

      "Participating Company"       any US Participating Company or
                                    International Participating Company;

      "Restricted Shares"           Shares which are the subject of an extant
                                    Award under the Plan in relation to which
                                    the Vesting Period has not terminated;

      "Rules"                       the Rules of the Plan and `Rule' shall be
                                    construed accordingly;

      "the Plan"                    the Covance,  Inc.  Restricted Share Plan in
                                    its  present  form,  or as from time to time
                                    altered in accordance with the Rules;

      "Share"                       a share of the class of common stock of the
                                    Company that is traded on the New York Stock
                                    Exchange;

<PAGE>


      "Subsidiary"                  has the meaning ascribed by Section 424(f)
                                    of the US Internal Revenue Code of 1986;

      "the Trustees"                the trustees from time to time of the Trust
                                    for the Plan;

      "US                           Eligible Employee" any person who is a
                                    director or employee of a US Participating
                                    Company and who is eligible to receive a
                                    contribution under Section 2.1 of the
                                    Covance Employee Stock Ownership plan
                                    (without regard to the limitations imposed
                                    by Section 4.04, thereof);

      "US                           Participating Company" a member of the Group
                                    which the Board has designated to
                                    participate in the Plan as a US
                                    Participating Company; Appendix A(2) lists
                                    the US Participating Companies at the date
                                    of establishment of the Plan;

      "Vesting Period"              the period of time from the Grant Date until
                                    the date when the restrictions placed on the
                                    Restricted Shares lapse;

      References to any statutory provision are to that provision as amended or
      re-enacted from time to time, and unless the context otherwise requires,
      words in the singular shall include the plural (and vice versa) and words
      importing the masculine the feminine (and vice versa).


<PAGE>

2.    GRANT OF AWARDS

   2.1      (a)   Subject  to Rule  2.2,  the  Committee  may,  in its  absolute
                  discretion, grant Awards under the Plan to Eligible Employees.

            (b)   TheCommittee  may  adopt  such  procedure  as it deems fit for
                  granting Awards,  whether by invitation to Eligible  Employees
                  to apply for  Awards or by  granting  Awards  without  issuing
                  invitations.

   2.2      (a)   1996 Award to International Eligible Employees.  The Committee
                  shall  grant an Award to each  person who is an  International
                  Eligible  Employee on 31 December  1996.  The total  number of
                  Shares  available  for award in 1996  shall be  determined  in
                  accordance  with Appendix B. Such award shall be allocated pro
                  rata to all International  Eligible Employees,  based on their
                  Annualized Base Compensation.

            (b)   One-Time  1996  Restricted  Share  Bonus  Award to US Eligible
                  Employees.  The  Committee  shall  grant  an  Award  to the US
                  Eligible Employees in accordance with Appendix B.

            (c)   1997 and 1998 Awards to International Eligible Employees.  Any
                  amounts that lapse in 1997 or 1998 in accordance  with Rules 5
                  and 6, together with any contributions that may be made by any
                  member of the Group,  shall be  allocated to  individuals  who
                  first become International Eligible Employees in the year of
<PAGE>

                  lapse (i.e., those International Eligible Employees hired in
                  that year). Such awards shall be allocated pro rata, based on
                  Annualized Base Compensation.

            (d)   1999 and 2000 Awards to International Eligible Employees.  Any
                  amounts that lapse in 1999 or 2000 in accordance  with Rule 5,
                  together with any contributions that may be made by any member
                  of the Group, shall be allocated to all Eligible Employees pro
                  rata based on Annualized Base Compensation.

            (e)   The Committee may, in its absolute discretion, direct that
                  Company contributions be made to the Plan Trust by the Company
                  or other member of the Group for the purpose of allocation for
                  the 1997, 1998, 1999, or 2000 calendar year, as described
                  above.

      2.3   The terms attaching to an Award may include,  without limitation,  a
            condition  that the granting of an Award is subject to the surrender
            for  cancellation  of any  or all  outstanding  Awards  held  by the
            Eligible Employee.

      2.4   The  Company  shall issue to each  Eligible  Employee to whom it has
            granted an Award an Award  Certificate,  which shall be in such form
            as the  Committee  shall  from  time to time  determine.  The  Award
            Certificate shall include details of:

            (a)   the Date of Grant of the Award;
            (b)   the number of Restricted Shares.

<PAGE>

      2.5   Each Eligible  Employee to whom an Award is granted may by notice in
            writing  within 30 days of the Date of Grant disclaim in whole or in
            part his rights  under the Award in which  case the Award  shall for
            all purposes be deemed never to have been granted.

      2.6   Every Award shall be personal to the Eligible Employee to whom it is
            granted and shall not be capable of being transferred,  assigned, or
            charged.  Each Award  Certificate  shall carry a  statement  to this
            effect.

3.    CONDITIONS RELATING TO THE GRANT OF AWARDS
      3.1   The  Committee  may  determine  that any Award  shall be  subject to
            additional  and/or  modified  terms and  conditions  relating to the
            grant and terms of  exercise as may be  necessary  to comply with or
            take account of any securities,  exchange  control or taxation laws,
            regulations, or practice of any territory which may have application
            to the relevant  Eligible  Employee,  Award Holder, or member of the
            Group.

      3.2   In exercising its discretion under Rule 3.1 the Committee may:

            (a)   require an Award Holder to make such declarations or take such
                  other  action (if any) as may be  required  for the purpose of
                  any  securities,  taxes,  or other laws of any territory which
                  may be applicable to him at the Date of Grant or at the end of
                  the Vesting Period; and

            (b)   adopt any supplemental rules or procedures governing Awards as
                  may be  required  for the purpose of any  securities,  tax, or
                  other  laws of any  territory  which may be  applicable  to an
                  Eligible Employee or Award Holder.


<PAGE>

      3.3   When events have happened which cause the Committee to consider that
            any existing constraints and/or conditions (as the case may be) have
            become unfair or  impractical,  the  Committee  may, in its absolute
            discretion,  amend,  relax, waive, or substitute such constraints or
            conditions  so that  such  constraints  or  conditions  so  amended,
            relaxed,  waived, or substituted would, in the reasonable opinion of
            the  Committee,  be no more or less difficult to abide by or satisfy
            than when they were  originally  imposed or last  amended or relaxed
            (as the case may be). After any such amendment,  relaxation, waiver,
            or  substitution,  the  Committee  shall issue to the Award Holder a
            replacement  Award Certificate or other notice including the details
            specified in Rule 2.4.

4.    RIGHTS OF AWARD HOLDER DURING VESTING PERIOD
      4.1   During  the  Vesting  Period,  the  Award  Holder  shall  not  sell,
            transfer,  pledge, assign, or otherwise dispose of all or any of the
            Restricted Shares or any interest therein.  Any attempt by the Award
            Holder to sell,  transfer,  pledge,  assign, or otherwise dispose of
            such Restricted  Shares,  or any interest  therein,  shall result in
            immediate forfeiture of such Award.

      4.2   During the Vesting Period:
            (a)   the Trustees shall exercise (or refrain from  exercising)  the
                  voting rights  attaching to the  Restricted  Shares subject to
                  Awards  made to those  Award  Holders  in such  manner as they
                  shall in their absolute discretion think fit; and

            (b)   all  dividends  and other  distributions  with respect to such
                  Restricted Shares shall be used to acquire further  Restricted
                  Shares  which will be held subject to the Awards to which they
                  relate, and

<PAGE>


            (c)   any scrip  dividends  shall be held  subject to the Awards
                  to which they relate.

5.    LAPSE OF AWARDS
      Where any Award made under the Plan lapses, the Shares subject to that
      Award shall be allocated in accordance with Rule 2.2.

6.    TERMINATION OF VESTING PERIOD AND LAPSE OF AWARDS

      6.1   The  Vesting  Period for an Award shall  terminate  on the January 1
            following the second anniversary of the Award's Date of Grant, or if
            earlier, the date on which the Award Holder dies, attains age 65, or
            ceases to be an Eligible  Employee  by reason of what the  Committee
            considers,  in its absolute  discretion,  to be total and  permanent
            disability;  provided,  however,  that  any  individual  who  is  an
            Eligible Employee on January 1, 2001 shall be fully vested; provided
            further,  that an Eligible  Employee may sooner  become fully vested
            upon a "Change of Control" of the Company.

            There will be a "Change of Control" of the Company when:
            (a)   any person  (including  as such term is used in Section  13(d)
                  and 14(d)(2) of the  Securities  Exchange Act of 1934) becomes
                  the beneficial owner, directly or indirectly, of the Company's
                  securities  representing  20 percent  or more of the  combined
                  voting power of the Company's then outstanding securities;
            (b)   as a result of a proxy  contest or  contests or other forms of
                  contested  shareholder votes (in each case either individually
                  or in the aggregate), a majority of the individuals elected to
                  serve on the Company's board
                  

<PAGE>

                  of directors are different than the  individuals who served on
                  the  Company's  board of  directors at any time within the two
                  years  prior to such proxy  contest or contests or other forms
                  of   contested   shareholder   votes  (in  each  case   either
                  individually or in the aggregate);
            (c)   the Company's  shareholders  approve a merger or consolidation
                  (where in each case the Company is not the  survivor  thereof)
                  or  sale or  disposition  of all or  substantially  all of the
                  Company's   assets  or  a  plan  of  or  partial  or  complete
                  liquidation;
            (d)   an offerer  (other than the Company)  purchases  shares of the
                  Company's  common stock pursuant to a tender or exchange offer
                  for such shares.

      6.2   To the extent that a Vesting Period has not expired, the Award shall
            lapse on the date on which an Award Holder  ceases to be an Eligible
            Employee by reason of a termination of employment. For this purpose,
            a leave of absence of an Eligible  Employee  that is approved by the
            employing  Participating Company that has a duration of three months
            or less shall not in and of itself be  considered a  termination  of
            employment.  Approved  leaves of absence of greater  duration may be
            afforded the same  treatment only if the Committee so decides in its
            absolute discretion.

7.    RELEASE OF RESTRICTED SHARES

      When the  Vesting  Period  in  relation  to an Award  ends,  the  relevant
      Restricted Shares shall be allotted or transferred (as the case may be) to
      the Award  Holder as soon as  possible,  and  accordingly  in cases  where
      Restricted  Shares are to be  transferred,  the Company shall use its best
      endeavors to ensure due transfer thereof.
<PAGE>

8.    ISSUE OF SHARES

      8.1   All  Shares  issued  pursuant  to Awards  under the Plan shall as to
            voting,  dividend,  transfer,  and  other  rights  (including  those
            arising on a  liquidation)  rank pari passu in all respects with the
            Shares  then in  issue,  except  that  they  shall  not rank for any
            dividend  or other  rights  declared by  reference  to a record date
            preceding the date of issue.

      8.2   If and so long as the  Shares  are  listed  on the  New  York  Stock
            Exchange,  the Company shall use its best  endeavors to procure that
            as soon as practicable after the allotment of any Shares pursuant to
            the Plan  application  shall be made to the New York Stock  Exchange
            for admission of the Shares to dealing.

9.    DISCRETION AS TO FORM OF PAYMENT
      9.1   On termination  of the Vesting  Period in relation to an Award,  any
            Award shall be paid in Shares,  except that, in its discretion,  the
            Committee  may in lieu of allotting or procuring the transfer of any
            or all Restricted Shares in accordance with Rule 7 pay to such Award
            Holder  a cash  sum  equal to the  Market  Value of such  Restricted
            Shares as of the first business day following the end of the Vesting
            Period.

      9.2   If  payment is made  pursuant  to this Rule to an Award  Holder,  he
            shall have no further rights in respect of such  Restricted  Shares.
            The  Committee  may make any  deductions  in respect of such payment
            which it is required to make under the laws of any  territory  which
            laws are applicable to the Award Holder and/or his employing  member
            of the Group.
<PAGE>

10.   ADJUSTMENTS
      10.1  The number of Restricted  Shares subject to an Award may be adjusted
            in such manner as the  Committee  shall  determine,  in its absolute
            discretion (and which the Auditors shall confirm in writing to be in
            their opinion fair and  reasonable),  following  any  capitalization
            issue, subdivision, consolidation, or reduction of share capital and
            in respect  of any  discount  element  in any rights  issue or other
            variation  of share  capital to the intent that (as nearly as may be
            possible  without  involving  fractions of a Share) the value of the
            Award shall remain unchanged.
      10.2  The  Committee  may take such steps as it may consider  necessary to
            notify Award Holders of any adjustments  made under Rule 10.1 and to
            call in, cancel,  endorse,  issue, or reissue any Award  Certificate
            consequent upon such adjustment.

11.   ADMINISTRATION
      11.1  Notices or documents required to be given to an Eligible Employee or
            to an Award  Holder shall either be delivered to him by hand or sent
            to him by first  class  post,  pre-paid  at his last  known  home or
            business  address  according  to the  information  provided  by him.
            Notices  sent by mail  shall be  deemed  to have  been  given on the
            seventh day following the date of posting.

      11.2  The Company may  distribute to Award Holders copies of any notice or
            document sent by the Company to its shareholders generally.
<PAGE>

      11.3  The  Company  shall at all times  either keep  available  sufficient
            unissued  Shares to satisfy all extant Awards (taking account of any
            other  obligations of the Company to allot unissued Shares) or shall
            ensure that  sufficient  issued  Shares will be available to satisfy
            the exercise of such Awards.

      11.4  The Committee may make such  regulations for the  administration  of
            the Plan as it deems fit, provided that no regulation shall be valid
            to the extent it is inconsistent with the Rules.

      11.5  The decision of the  Committee in any dispute  relating to an Award,
            or the due exercise  thereof,  or any other matter in respect of the
            Plan or any Rule,  shall be final  and  conclusive,  subject  to the
            determination of the Auditors, when so required by Rule.

      11.6  The  costs  of  establishing  and  administering  the  Plan  and the
            associated   costs  of   making   Awards   shall  be  borne  by  the
            Participating  Companies in such  proportions as the Committee deems
            fit.

      11.7  Any stamp duty  chargeable on the  instruments  of transfer  entered
            into pursuant to each Award Agreement shall be borne by the Company,
            or where relevant,  the  Participating  Company  employing the Award
            Holders.

12.   ALTERATIONS

      12.1  Subject to Rule 12.2,  the Committee may in its absolute  discretion
            alter the Rules.
<PAGE>

      12.2  No alteration may be made which would  abrogate or adversely  affect
            the subsisting rights of Award Holders.

      12.3  Written notice of any amendment made in accordance with this Rule 12
            shall be given to all Award Holders.

13.   GENERAL

      13.1  The Plan shall  terminate  on the tenth  anniversary  of the date on
            which it is  approved  by the  Company in general  meeting or at any
            earlier  time  by the  passing  of a  resolution  by the  Committee.
            Termination of the Plan shall be without prejudice to the subsisting
            rights of Award Holders.

      13.2  If an  Award  Holder  shall  cease  for  any  reason  to  be in  the
            employment of a Participating  Company, he shall not be entitled, by
            way of compensation  for loss of office or otherwise  howsoever,  to
            any sum or any benefit to  compensate  him for the loss of any right
            or benefit accrued or in prospect under the Plan.

      13.3  This Plan and all  Awards  shall be  governed  by and  construed  in
            accordance with English law.


<PAGE>


                                   APPENDIX A1
                      International Participating Companies


                           CORNING Bessalear Limited (England)
                           CORNING Bessalear Limited (Ireland)
                           GHBA A.G.
                           CORNING Bessalear AG
                           G.H. Bessalear Associates GmbH
                           CORNING Bessalear Pty. Ltd.
                           CORNING Bessalear S.A.
                           CORNING Bessalear SARL
                           CORNING Hazleton GmbH
                           CORNING SciCor S.A.
                           CORNING Pharmaceutical Services  Ltd.
                           CORNING Bessalear Ltd.
                           CORNING Bessalear CRU Ltd.
                           CORNING Hazleton Ltd.
                           CRS Pacmed A.G.


<PAGE>


                                   APPENDIX A2
                           US Participating Companies


COVANCE INC. (f/k/a Corning Pharmaceutical Services Inc.)(Delaware)
Covance   Clinical  and   Periapproval   Services  Inc.  (f/k/a  Corning
   Besselaar Inc.)(New Jersey)
Covance Clinical  Research Unit Inc. (f/k/a Corning  Besselaar  Clinical
   Research Units Inc.)(Florida)
Covance Periapproval Services Inc. (f/k/a Corning Pact Inc.)(Delaware)
Covance Preclinical Corporation (f/k/a Hazleton Corporation)(Washington)
Covance Laboratories Inc. (f/k/a/ Corning Hazleton Inc.)(Delaware)
Covance Research Products Inc. (f/k/a HRP Inc.)(Pennsylvania)
Covance Central Laboratory Services Inc. (f/k/a Corning SciCor Inc.)
Covance  Central  Laboratory  Limited  Partnership  dba Covance  Central
   Laboratory    Services   Inc.    (f/k/a/   Corning   SciCor   Limited
   Partnership)(Indiana)
Covance  Pharmaceutical  Packaging Services Inc. (f/k/a Corning National
   Packaging Inc.)(Connecticut)
Covance Health  Economics and Outcome  Services Inc.  (f/k/a Corning HTA
   Inc.)(Delaware)
Covance Biotechnology Services Inc. (f/k/a Corning Bio Inc.)(Delaware)
Pharmaceutical  Laboratory Services Inc.


<PAGE>


                           APPENDIX B: 1996 ALLOCATION

The 1996 Total allocation shall be determined as follows:

1.    1996 Total  Allocation.  The 1996 total  allocation shall be determined as
      follows:  the total  allocation  of shares to the Covance  Employee  Stock
      Ownership  Plan  ("ESOP")  and the Plan shall  equal to 1.5 percent of the
      Shares outstanding on 31 December 1996, with such determination being made
      before such allocation.

2.    Aggregate   International   Base   Compensation   and  Aggregate  US  Base
      Compensation.  Aggregate  International  Base Compensation shall equal the
      sum of the Annualized Base Compensation (converted to US dollars) for each
      individual who is an International  Eligible Employee on 31 December 1996.
      The Aggregate US Base  Compensation  shall equal the sum of the Annualized
      Base  Compensation for each individual who is a US Eligible Employee on 31
      December 1996. Total Aggregate Base  Compensation  shall be the sum of the
      Aggregate  International  Base  Compensation  and  the  Aggregate  US Base
      Compensation.

3.    Allocation  Between Plans.  The portion of the 1996 Total Allocation shall
      be divided into the International  Portion and the US Portion, as follows:
      (a)  first,  shares  having  a  value  equal  to 1  percent  of  Aggregate
      International   Compensation  shall  be  allocated  to  the  International
      Portion; and

      (b)   next, the remainder of the 1996 Total  Allocation shall be allocated
            to the  International  Portion and the US Portion in the proportions
            represented by Aggregate International Compensation and Aggregate US
            Compensation, respectively.
<PAGE>

4.    Award  to   International   Eligible   Employees   Under  this  Plan.  The
      International  Portion  shall  be  allocated  to  International   Eligible
      Employees under this Plan in accordance with Rule 2.2(a) hereof.

5.    One-Time Restricted Share Bonus Award to US Eligible Employees. The Awards
      to US Employees under this Plan shall be determined as follows:
      (a)   for each US Eligible Employee,  determine the amount of Award, based
            on the US Portion (as determined above) that would be provided under
            the ESOP,  without regard to the limitations  imposed by Section 415
            of the Code;
      (b)   for each US Eligible Employee,  determine the amount of award, based
            on the US Portion (as determined above) that would be provided under
            the ESOP, after application of the limitations by Section 415 of the
            Code;   this  amount  shall  be  awarded  under  the  ESOP  to  such
            individuals;
      (c)   the  difference  between  (a) and (b) above shall be awarded to each
            Eligible Employee under this Plan.

      The one-time Restricted Share bonus to US Eligible Employees is a distinct
      and separate Award that is only applicable for calendar year 1996.



                                    - 6 -

                                  COVANCE INC.

                              RESTRICTED STOCK PLAN

                           FOR NON-EMPLOYEE DIRECTORS

<PAGE>






                                  COVANCE INC.
                              RESTRICTED STOCK PLAN
                           FOR NON-EMPLOYEE DIRECTORS

1. Purpose

   The Restricted Stock Plan for Non-Employee  Directors (the "Plan") is to be a
   part of the compensation paid by Covance Inc. (the "Corporation") for service
   as a director to  individuals  who are not employees of (i) the  Corporation,
   (ii) any  subsidiary  corporation  of the  Corporation  within the meaning of
   Section 424 (f) of the Internal Revenue Code of 1986, as amended (the "Code")
   or of any  successor  section (a  "Subsidiary")  or (iii) any other entity in
   which he  Corporation  has at least one half of the ownership  interest (such
   persons being referred to herein as  "Non-Employee  Directors").  The Plan is
   intended to increase the proprietary interest of the Non-Employee  Directors,
   as owners of additional shares of Covance Inc. common stock ("Common Stock"),
   in the Corporation's success and progress.

2. Administration

   The Plan shall be  administered by the Committee of the Board of Directors of
   the Corporation, which shall consist of at least three directors who together
   shall have the authority to adopt rules and  regulations for carrying out the
   Plan and to interpret, construe and implement the provisions of the Plan. The
   Committee may obtain such advice or assistance as it deems  appropriate  from
   persons not serving on the committee.

3. Eligibility

   Any Director of Covance Inc. (the  "Corporation")  who is not an officer or
   employee  of  the  Corporation  or a  Subsidiary  thereof  is  eligible  to
   participate in the Plan.

4. Restricted Stock

<PAGE>

   The stock  subject to grant  under the Plan shall be limited to shares of the
   Corporation's  Common Stock,  from the authorized and unissued  Covance Board
   approved pool of 105,000 shares of Covance Inc. Common Stock.

5. Recapitalization

   The  number  of units in the  participant's  market  value  account  shall be
   proportionally  adjusted for any increase or decrease in the number of issued
   shares of Common Stock of the  Corporation  resulting  from a subdivision  or
   consolidation  of shares or other  capital  adjustment,  or the  payment of a
   stock dividend or other increase or decrease in such shares effected  without
   receipt of consideration by the Corporation,  or any distribution or spin-off
   of assets (other than cash) to the stockholders of the Corporation.

6. Terms of Grant

   a) Issuance - Each  individual  upon becoming a  Non-Employee  Director,  and
      eligible to participate in the Plan pursuant to Section 3 hereof, shall be
      issued by the  Corporation  one or more  certificates  representing in the
      aggregate  Two  Thousand  (2,000)  shares  of  the  Common  Stock  of  the
      Corporation, which shares shall be issued and subject to the provisions of
      the Plan. Each  individual  shall be issued by the Corporation one or more
      certificates  representing  in aggregate  two hundred  (200) shares of the
      Common Stock of the Corporation per year of service.

   b) Restrictions  on Transfer - All shares  granted to a Participant  shall be
      subject to  restriction on transfer so long as the  Participant  remains a
      Non-Employee Director and may not be sold, assigned, transferred,  pledged
      or otherwise encumbered while the Participant is a Non-Employee Director.

   c) Forfeitability  - Except as set forth in the next paragraph,  in the event
      the  Participant  ceases to be a Non-Employee  Director of the Corporation
      all  shares  of  Common  Stock  granted  to him  under  the Plan  shall be
      forfeited and all rights of the Participant to such shares shall terminate
      without  further  obligation  on the  part  of the  Corporation;  provided
      however,  if such  cessation  is on  account of death or medical or health
      reasons  which  render the  Participant  unable to perform  the duties and
      responsibilities  owed to the  Corporation  in his capacity as a director,
      the  possibility  of  forfeiture  shall lapse in its entirety and all such
      shares shall be vested in him.

                                       -2-
<PAGE>

   d) Vesting - Shares  granted as the  initial  award of 2,000  Covance  common
      shares shall be subject to the possibility of forfeiture until the date on
      which the Participant  terminates service as a Non-Employee  Director with
      the  affirmative  consent  of a  majority  of the  members of the Board of
      Directors,  which  consent  (i) shall be given  upon such  termination  of
      service following the Participant's  having reached age 72 and (ii) may be
      given  following  the  Participant's  having  completed  six years  (cliff
      vesting) of service as a Non-Employee  Director (including service as such
      with Corning Incorporated or Corning Pharmaceutical Services Inc. prior to
      the date of initial  grant) and having  terminated  service for reasons or
      under circumstances approved by a majority of the Compensation  Committee.
      If a Participant  terminates  service as a Non-Employee  Director prior to
      meeting the requirements set forth in the preceding sentence, the Board of
      Directors may, in its sole discretion, remove the restrictions on transfer
      and the  possibility of forfeiture  from such number of shares held by the
      Participant  under  the  Plan as it  determines  is  equitable;  provided,
      however,  such number shall not exceed an amount based upon the ratio that
      the number of years of service as a  Non-Employee  Director at the time of
      termination  (including  service prior to the date of initial grant) bears
      to six years  (cliff  vesting)  service as a director.  In  addition,  all
      Shares shall become  immediately vested as of the date on which there is a
      "Change in Control" of the  Corporation.  For this  purpose,  a "Change in
      Control"  shall be deemed to have  occurred  upon the earliest to occur of
      the following:  (i) the date the Corporation  becomes a party to a merger,
      consolidation,  or sale of  substantially  all of its  assets or any other
      corporate  reorganization  in  which  the  Corporation  will  not  be  the
      surviving corporation, or in which the holders of the Corporation's Common
      Stock will receive securities of another corporation, (ii) the purchase by
      an  individual,  or group of  individuals  acting in concert,  of at least
      thirty  percent  of the voting  securities  of the  Corporation,  or (iii)
      during any twenty-four  month period,  individuals who at the beginning of
      such period  constituted  the Board of  Directors  cease for any reason to
      constitute a majority thereof.

   e) Certificates - Each  certificate  representing  the shares of Common Stock
      awarded  hereunder  may be  stamped  or  otherwise  imprinted  on the face
      thereof with a legend in  substantially  the following  form:  "The shares
      represented  by this  certificate  have  not  been  registered  under  the
      Securities Act of 1933. This certificate and the shares represented hereby
      are  subject 

                                       -3-
<PAGE>

      to the possibility of forfeiture under, and may be sold,  transferred,  or
      otherwise disposed of only in accordance with, the terms of the Restricted
      Stock Plan for  Non-Employee  Directors  of Covance  Inc., a copy of which
      Plan is on file in the office of the Secretary of Covance,  Princeton, New
      Jersey.

   f) Possession - Each certificate  issued with respect to the shares of Common
      Stock granted  pursuant to the Plan shall be registered in the name of the
      Participant but shall be held by the  Corporation  for  safekeeping  until
      possibility  of forfeiture  and the  restriction on transfer of the shares
      lapse  pursuant  to the  terms  of the  Plan.  After  the  possibility  of
      forfeiture and the transfer  restrictions  applicable to shares registered
      in the name of a  Participant  shall have lapsed,  the  Corporation  shall
      deliver to the Participant or to the  Participant's  beneficiary or estate
      one or more certificates  representing the number of shares then vested in
      the Participant and free of restrictions.

7. Amendment of the Plan

   The  Board of  Directors  may from time to time  alter,  amend,  suspend,  or
   discontinue  the Plan,  except that no  alteration  or  amendment  (i) to the
   provisions  of  Section 6 hereof  shall be made more  often  than once in any
   six-month  period and (ii) shall,  without  the  approval of the holders of a
   majority  of the  outstanding  shares  of  Common  Stock  of the  Corporation
   entitled to vote  thereon,  provide for the grant of Common Stock from shares
   authorized and unissued.

8. Miscellaneous

   a) Nothing in the Plan shall be deemed to create any  obligation  on the part
      of the Board of Directors to nominate any director for  re-election by the
      Corporation's stockholders.

   b) The Corporation shall have the right to require,  prior to delivery of any
      shares granted hereunder,  payment by the Participant of cash or shares of
      Common Stock of the Corporation to cover such taxes as are required by law
      with respect to the issuance or delivery of such shares.

9. Effective Date and Term of Plan


                                       -4-
<PAGE>

   The Plan shall become  effective on 3 December 1996 when approved by the vote
   of the  Board of  Directors  of the  Corporation  and  shall  continue  until
   terminated by such Board.

10. Claims Procedure

   a) Denial of Claim for Benefits. Any denial by the Committee of any claim for
      benefits under the Plan by a Participant shall be stated in writing by the
      Committee and delivered or mailed to the Participant.  The Committee shall
      furnish the Participant with notice of the decision not later than 90 days
      after  receipt  of the  claim,  unless  special  circumstances  require an
      extension of time for processing  the claim.  If such an extension of time
      for  processing  is required,  written  notice of the  extension  shall be
      furnished to the  Participant  prior to the  termination of the initial 90
      day period.  In no event shall such  extension  exceed a period of 90 days
      from the end of such initial period.  The extension  notice shall indicate
      the special  circumstances  requiring an extension of time and the date by
      which the Committee  expects to render the final  decision.  The notice of
      the  Committee  decision  shall be  written in a manner  calculated  to be
      understood by the Participant  and shall include (i) the specific  reasons
      for the denial, including, where appropriate, references to the Plan, (ii)
      any  additional  information  necessary  to  perfect  the  claim  with  an
      explanation of why the information is necessary,  and (iii) an explanation
      of the procedure for perfecting the claim.

   b) Appeal of Denial.  The  Participant  shall  have 60 days after  receipt of
      written  notification  of  denial  of his or her  claim in which to file a
      written  appeal  with the  Committee.  As a part of any such  appeal,  the
      Participant  may submit  issues and  comments  in  writing  and shall,  on
      request,  be afforded an opportunity to review any documents  pertinent to
      the perfection of his or her claim.  The Committee  shall render a written
      decision on the Participant's  appeal ordinarily within 60 days of receipt
      of notice thereof but, in no case, later than 120 days.

11.  Miscellaneous

   a) Limited Purpose of Plan.  The establishment or existence of the Plan
      shall not confer upon any individual the right to be continued as a
      Director.

                                       -5-
<PAGE>

   b) Non-alienation.  No amounts payable under the Plan shall be subject in
      any manner to anticipation, assignment, or voluntary or involuntary
      alienation.

   c) Facility  of Payment If the  Committee,  in its sole  discretion,  deems a
      Participant  who is  eligible  to  receive  any  payment  hereunder  to be
      incompetent to receive the same by reason of age, illness or any infirmity
      or incapacity of any kind,  the  Committee may direct the  Corporation  to
      apply such payment  directly  for the benefit of such  person,  or to make
      payment to any person  selected by the  Committee to disburse the same for
      the benefit of the  Participant.  Payments  made  pursuant to this Section
      11(c)  shall  operate  as a  discharge,  to  the  extent  thereof,  of all
      liabilities of the  Corporation  and the Committee to the person for whose
      benefit the payments are made.

   d) Governing Law.  This Plan shall be governed by and construed in
      accordance with the laws of the state of New Jersey, to the extent not
      preempted by federal law.


                                       -6-








                                  COVANCE INC.

                           DEFERRED COMPENSATION PLAN
                                  FOR DIRECTORS

                           Effective December 3, 1996
               -----------------------------------------------

This is the Covance Inc.  Deferred  Compensation  Plan for Directors,  effective
December  3, 1996 (the  "Plan"),  established  by Covance  Inc.  to provide  its
non-employee   directors  with  an  additional  method  of  planning  for  their
retirement.  The Plan is  intended  to be an unfunded  plan  maintained  for the
purpose of providing  deferred  compensation  to the  non-employee  directors of
Covance Inc.

Section 1.  Effective Date

The effective date of the Plan is December 3, 1996.

Section 2.  Eligibility

Any  Director  of  Covance  Inc.  (the  "Company")  who is not an  officer  or
employee of the Company or a subsidiary  thereof is eligible to participate in
the Plan.

Section 3.  Deferred Compensation Accounts

There shall be established for each participant a deferred  compensation account
or accounts in the participant's name.

Section 4.  Amount of Deferral

A  participant  may elect to defer receipt for any year of either (a) all of the
compensation payable to the participant for serving on the Board of Directors of
the Company and  Committees  of the Board of  Directors or (b) only the retainer
(basic annual fee) payable to the participant for membership on such Board.

Section 5.  Investment of Deferred Amounts

      (a) General.  A  participant  may  designate,  in  increments  of 10%, the
      compensation  to  be  deferred  or  compensation  already  deferred  to be
      allocated to a cash account and a market value account or any  combination
      of such accounts. Any change in such designation of future deferrals under
      the  Plan may be made no later  than  the  15th day of each  March,  June,
      September and December  during the deferral  period to be effective on the
      date next following such notification  that  compensation  would have been
      paid in accordance with the Company's normal practice but for the election
      to defer. Any change in such designation of amounts already deferred under
      the Plan may be made no later than December
<PAGE>

      15th of any Plan Year and shall become  effective as of January 1st of the
      next Plan Year.

(b)   Cash  Account.   The  amount,  if  any,  in  the  participant's   deferred
      compensation  cash  account  shall  be  credited  with  interest,   to  be
      compounded  quarterly,  calculated  prospectively  at a rate  equal to the
      prime  rate in effect  on the date  compensation  would  have been paid in
      accordance  with such  practice on the first day of each  January,  April,
      July and October during the deferral period.

(c)   Market  Value  Account.  The  amount,  if any,  in or  allocated  to the
      participant's  deferred  compensation  market value account on each date
      compensation  would  have been  paid in  accordance  with the  Company's
      normal  practice  but for the  election to defer shall be  expressed  in
      units,  the number of which shall be equal to such amount divided by the
      closing  price of shares of the  Company's  Common Stock on the New York
      Stock Exchange  (hereinafter referred to as "Market Value") on such date
      or on the  trading  day next  preceding  such date if such date is not a
      trading  day.  On  each  date  that  the  Company  pays a  regular  cash
      dividend on shares of its Common Stock  outstanding,  the  participant's
      account  shall be credited with a number of units equal to the amount of
      such  dividend  per  share  multiplied  by the  number  of  units in the
      participant's  account on such date  divided by the Market Value on such
      dividend  date or on the  trading  day next  preceding  such date if the
      dividend  payment  date is not a trading  day. The value of the units in
      the  participant's  market  value  account  on any given  date  shall be
      determined by reference to the Market Value on such date.

(d)   Recapitalization.  The  number  of  units  in the  participant's  market
      value  account  shall be  proportionally  adjusted  for any  increase or
      decrease in the number of issued  shares of Common  Stock of the Company
      resulting  from a  subdivision  or  consolidation  of  shares  or  other
      capital  adjustment,  or  the  payment  of a  stock  dividend  or  other
      increase  or  decrease  in  such  shares  effected  without  receipt  of
      consideration by the Company,  or any distribution or spin-off of assets
      (other than cash) to the stockholders of the Company.

Section 6.  Period of Deferral

A  participant  may elect to defer  receipt of  compensation  either (a) until a
specified  year in the  future  or (b) until the  participant's  termination  of
service as a Director of the  Company.  If  alternative  (a) is elected,  actual
payment will be made or will  commence  within sixty days after the beginning of
the year specified. If alternative (b) is elected,  payment will be made or will
commence  within sixty days after  termination  of services as a Director of the
Company.  In addition,  at any point prior to a year in which a distribution  of
any or all of a participant's  account is scheduled for distribution pursuant to
this Section 6, the  participant  shall have the option to further  defer all or
part of the scheduled  distribution to a later year. A scheduled distribution or
portion thereof may, however, be further deferred only once.

                                      -2-

<PAGE>

Section 7   Accelerated Distributions

(a) Hardship Distributions. A participant may elect to receive a distribution of
amounts  credited to his account prior to the date or dates  originally  elected
under Section 6 without penalty if such distribution is necessary as a result of
an  unforeseen  hardship  and the  amount of the  distribution  is limited to an
amount  reasonably  necessary  to  satisfy  the  unforeseen  hardship.  For this
purpose,  an "unforeseen  hardship" is defined as severe financial hardship to a
participant  resulting from a sudden and  unexpected  illness or accident of the
participant or of a participant's  dependent,  loss of a participant's  property
due to casualty, or other similar extraordinary and unforeseeable  circumstances
arising as a result of events beyond the participant's  control. In addition, an
unforeseen  hardship will not be considered to have occurred if such hardship is
or may be relieved  through  reimbursement  by insurance or  liquidation  of the
participant's  assets,  to the extent the  liquidation  of such assets would not
itself cause severe hardship

(b) Other  Accelerated  Distributions.  A  participant  may  elect to  receive a
distribution of all or a portion of his account for any reason prior to the date
or dates originally elected under Section 6, subject to the following forfeiture
and suspension provisions.

      (i)  Forfeiture.  A participant  shall forfeit 10% of his account  balance
      under the Plan if he elects an accelerated distribution under this Section
      7(b).  Any  amounts  forfeited  under  this  Section  7(b)  shall  not  be
      distributed or allocated to any other account in the Plan.

      (ii) Suspension of Participation.  If a participant elects to accelerate a
      distribution under this Section 7(b), he will not be entitled to defer any
      additional  compensation  under  the Plan  for the  Plan  Year in which he
      elected  the  accelerated  distribution  and  the  Plan  Year  immediately
      following the Plan Year in which the  participant  elected to accelerate a
      distribution.

Section 8.  Form of Payment

On the  participant's  deferral  election form, the  participant  shall elect to
receive the compensation deferred under the Plan in either (a) a lump sum or (b)
a number of annual installments as specified by the participants. All amounts in
the participant's cash and market value accounts shall be paid in cash.

Section 9.  Death or Disability Prior to Receipt

In the event that a participant dies or becomes totally and permanently disabled
prior  to  receipt  of any or all of  the  amounts  payable  to the  participant
pursuant  to the Plan,  any  amounts  remaining  in the  participant's  deferred
compensation  account  may be  paid  to the  beneficiary  so  designated  on his
election  form in a lump sum within  sixty  (60) days  following  the  Company's
notification of the participant's death or disability.

                                      -3-

<PAGE>

Section 10. Time of Election of Deferral

Effective January 1, 1997 the period commencing January 1 and ending December 31
of each year shall be the Plan Year.

An election  to defer  compensation  may be made by a nominee for  election as a
Director prior to, or concurrently with the nominee's election for, the term for
which the nominee is being  elected,  and may be made by a person then currently
serving  as a  Director  for the next  succeeding  Plan  Year no later  than the
preceding December 15th.

Section 11. Manner of Electing Deferral

A participant  may elect to defer  compensation  by giving written notice to the
Secretary of the Company on a form  provided by the Company,  which notice shall
include the amount to be deferred,  the accounts to which such amounts are to be
allocated  and the  percentage  (in  increments  of 10%) of such  amounts  to be
allocated  to each  account,  the period of  deferral,  and the form of payment,
including the number of installments.

Section 12. Effect of Election

An election to defer  compensation  shall be  irrevocable  once the Plan Year to
which it  applies  has  commenced,  and may be  revoked  or  modified  only upon
demonstration of unforeseen  hardship,  as defined in Section 7 of the Plan, and
with the concurrence of the Compensation  Committee of the Board of the Company.
An election  covering  more than one Plan Year may be revoked or  modified  with
respect to Plan Years not yet begun by notifying the Secretary of the Company in
writing at least fifteen (15) days prior to the commencement of such Plan Year.

Section 13. Participant's Rights Unsecured

The Plan is an unfunded plan and the right of any  participant to receive future
payments  under the  provisions of the Plan shall be an unsecured  claim against
the general assets of the Company.

Section 14. Statement of Accounts

Statements  will be sent to each  participant  each  year as to the value of the
participant's  deferred  compensation  accounts  as of the end of the  preceding
December.

                                      -4-

<PAGE>

Section 15. Assignability

No right to receive payments  hereunder shall be transferable or assignable by a
participant,  except by will or by the laws of  descent  and  distribution.  The
participant may not sell,  assign,  transfer,  pledge or otherwise  encumber any
interest in the participant's  deferred  compensation account and any attempt to
do so shall be void against, and shall not be recognized by, the Company.

Section 16. Administration

The Compensation  Committee of the Board will determine the plan  administrator,
who  together  shall  have the  authority  to adopt  rules and  regulations  for
carrying out the Plan and  interpret,  construe and implement the  provisions of
the Plan.

Section 17. Amendment

The Plan may at any time or from time to time be amended, modified or terminated
by the Company.  No amendment,  modification or termination  shall,  without the
consent of the  participant,  adversely  affect  accruals in such  participant's
deferred compensation account.

Section 18. Claims Procedure

(a)   Denial of Claim for Benefits.  Any denial by the Compensation  Committee
      of any  claim for  benefits  under  the Plan by a  participant  shall be
      stated in writing by the Compensation  Committee and delivered or mailed
      to  the  participant.  The  Compensation  Committee  shall  furnish  the
      participant  with  notice of the  decision  not later than 90 days after
      receipt of the claim, unless special  circumstances require an extension
      of time for  processing  the  claim.  If such an  extension  of time for
      processing  is  required,  written  notice  of the  extension  shall  be
      furnished to the participant  prior to the termination of the initial 90
      day  period.  In no event  shall  such  extension  exceed a period of 90
      days from the end of such initial  period.  The  extension  notice shall
      indicate  the special  circumstances  requiring an extension of time and
      the date by which the  Compensation  Committee  expects  to  render  the
      final  decision.  The  notice  of the  Compensation  Committee  decision
      shall  be  written  in a  manner  calculated  to be  understood  by  the
      participant  and shall include (i) the specific  reasons for the denial,
      including,   where  appropriate,   references  to  the  Plan,  (ii)  any
      additional   information   necessary   to  perfect  the  claim  with  an
      explanation  of  why  the   information  is  necessary,   and  (iii)  an
      explanation of the procedure for perfecting the claim.

(b)   Appeal of Denial.  The  participant  shall have 60 days after receipt of
      written  notification  of  denial of his or her claim in which to file a
      written appeal with the  Compensation  Committee.  As a part of any such
      appeal,  the  participant  may submit issues and comments in writing and
      shall,  on request,  be afforded an  opportunity to review any documents
      pertinent  to the  perfection  of his or  her  

                                      -5-

<PAGE>

      claim. The  Compensation  Committee shall render a written decision on the
      participant's  appeal  ordinarily  within  60 days of  receipt  of  notice
      thereof but, in no case, later than 120 days.

Section 19. Miscellaneous

(a)   Limited  Purpose of Plan.  The  establishment  or  existence of the Plan
      shall not confer  upon any  individual  the right to be  continued  as a
      Director.

(b)   Non-alienation.  No amounts payable under the Plan shall be subject in any
      manner  to   anticipation,   assignment,   or  voluntary  or   involuntary
      alienation.

(c)   Facility  of  Payment  If  the  Compensation   Committee,  in  its  sole
      discretion,  deems a participant  who is eligible to receive any payment
      hereunder  to be  incompetent  to  receive  the same by  reason  of age,
      illness or any  infirmity or incapacity  of any kind,  the  Compensation
      Committee may direct the Company to apply such payment  directly for the
      benefit of such  person,  or to make  payment to any person  selected by
      the  Compensation  Committee to disburse the same for the benefit of the
      participant.   Payments  made  pursuant  to  this  Section  11(c)  shall
      operate as a discharge,  to the extent  thereof,  of all  liabilities of
      the  Company  and the  Compensation  Committee  to the  person for whose
      benefit the payments are made.

(d)   Governing  Law.  This  Plan  shall  be  governed  by  and  construed  in
      accordance  with the laws of the state of New Jersey,  to the extent not
      preempted by federal law.

                                      -6-





                                                                   Exhibit 10.14


                              Employment Agreement

                                     between

                               Christopher Kuebler

                                        &

                                  Covance Inc.

           This EMPLOYMENT AGREEMENT (the "Agreement") is entered into between
COVANCE INC. (formerly Corning Pharmaceutical Services Inc.) (the "Company"), a
Delaware corporation having its principal place of business at 210 Carnegie
Center, Princeton, NJ 08540-6233, and CHRISTOPHER KUEBLER (the "Executive"),
with a residence at 9 Woodland Road, Newtown, PA 18940 as of November 1, 1996
(the "Effective Date").


           WHEREAS, Executive has been employed by the Company as President and
Chief Executive Officer; and

           WHEREAS, the Company considers the services of the Executive to be
unique and essential to the success of the Company's business; and

           WHEREAS, the Company and the Executive now wish to enter into an
agreement of employment that will constitute the sole and exclusive agreement
relating to the employment of Executive by the Company on the terms and
conditions set forth herein.

           NOW, THEREFORE, in consideration of the foregoing premises, the
mutual covenants, terms and conditions set forth herein, and other valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, it
is hereby agreed between the Corporation and the Executive as follows:


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 2


      I.     Employment: The Company shall continue to employ the Executive in a
             full-time capacity in the position set forth in this paragraph, and
             the Executive shall continue to accept such employment upon the
             terms and conditions set forth herein. Such employment shall be in
             the capacity of President and Chief Executive Officer of the
             Company, and Chairman of the Board of Directors of the Company.


      II.    Term: Unless earlier terminated pursuant to Section IX hereof, the
             term of employment under the agreement shall commence on the
             Effective Date and shall continue through the third anniversary of
             the Effective Date (such initial term, as it may be extended from
             time to time in accordance with Section XVI or shortened pursuant
             to Section IX hereof being, the "Employment Term").


      III.   Duties: During the Employment Term, the Executive shall accept and
             diligently perform to the reasonable satisfaction of the Company,
             those executive services for the Company as may be commensurate
             with his position and title and as may be designated from time to
             time by the Company's Board of Directors in connection with any
             aspect of the Company's business. The Executive agrees to devote
             his undivided time and attention to the business of the Company.
             The Executive shall not, without the prior written consent of the
             Company's Board of Directors, be directly or indirectly engaged in
             any other trade, business or occupation for compensation requiring
             his personal services during the Employment Term. Nothing in this
             agreement shall preclude the Executive from: (i) engaging in
             charitable and community activities or from managing his personal
             investments, or (ii) serving as a member of the board of directors
             of an unaffiliated company not in competition with the Company,
             subject however in each such case of board membership, to approval
             by the Company's Board of Directors (which approval shall not be
             unreasonably withheld).


<PAGE>
Employment Agreement
Covance Inc. and Christopher Kuebler
Page 3

      IV.    Cash Compensation: Executive shall be compensated for services
             rendered during the Employment Term as follows:


             (a) Base Salary: Effective from and after the consummation of the
             spin-off described in Section XIX of this Agreement, Executive
             shall be compensated at an annual base salary of no less than
             $450,000 for the period during which he serves as President and
             Chief Executive Officer of the Company. The Company's Board of
             Directors shall review and may, if appropriate, at its discretion,
             increase (but not decrease) this annual base salary effective the
             first day of any future new year during the Employment Term to
             reflect ordinary salary actions generally granted to other Company
             employees.

             (b) Variable (bonus) Pay: In addition to the Base Salary provided
             for in Section IV(a) above, Executive will participate in the
             Company's Variable Compensation Plan (the "Bonus Plan"). The Bonus
             Plan provides that upon satisfaction of certain goals for the
             Company established by the Company's Board of Directors, Executive
             shall receive an annual incentive equal to 65% of Executive's
             annual base salary in effect at the time the goals are established;
             provided, however, that Executive's payout, if any, under the Bonus
             Plan for 1997 shall be computed using his salary specified in
             Section IV (a) hereof.


             The Bonus Plan also provides that Executive may earn up to 130% of
             Executive's annual base salary in effect at the time the goals are
             established if the Company has outstanding results, again as
             determined by the Company's Board of Directors. At the discretion
             of the Company's Board of Directors, any annual incentive
             compensation in excess of 65% of Executive's annual base salary may
             be paid to Executive in non-qualified stock options, the terms of
             which would be specified in a Stock Option 
<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 4

             Agreement entered into pursuant to the Company's Employee Equity
             Participation Program. Actual awards would be determined by the
             Company's Board of Directors after the end of the applicable
             performance year and would be granted to Executive shortly
             thereafter. The annual incentive percentage targets may be
             increased, but not decreased, during the Employment Term.

      V.     Equity /Awards: Executive may be awarded, from time to time,
             additional compensation (such as stock options or restricted stock)
             pursuant to the Company's Employee Equity Participation Program or
             any additional or replacement incentive compensation or long-term
             compensation program established for the senior officers of the
             Company. Any awards under such programs, except as provided below,
             shall be at such levels or in such amounts as the Company's Board
             of Directors deems, in its sole discretion, appropriate for the
             position occupied by Executive and his performance therein. The
             terms, conditions and rights with respect to any such grants will
             be subject to the actual provisions and conditions applicable to
             such plans.


             In conjunction with the Executive's first year participation in the
             Company's Employee Equity Participation Program, the Company shall
             grant to the Executive, on the terms set forth below, that number
             of shares of the Company's common stock, subject to certain
             restrictions (the "Restricted Stock"), and options to purchase the
             Company's common stock (the "Stock Options"), that have in the
             aggregate a present value equal to not less than $1,619,982 (the
             "First Grant Value"). The First Grant Value shall consist of Stock
             Options and Restricted Stock in the ratio of three Stock Options
             for every share of Restricted Stock. Each Stock Option shall be
             worth a present value amount equal to the product of (i) the fair
             market value of the Company's common stock and (ii) .33. The fair
             market value of the Company's common stock shall be determined
             based on the weighted average per share price of each trade of the
             Company's common stock occurring during normal trading hours of the
             first five days of "regular way" trading after completion of the
             spin-off described in Section XIX hereof. The rights, 

<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 5

             obligations and other conditions of the Restricted Stock and Stock
             Options shall be as specified in that certain Incentive Stock 
             Agreement and Stock Option Agreement, in each case, between 
             Executive and the Company.


      VI.    Employee Benefits:

             (a) General Provisions: Except as expressly provided in this
             Agreement, Executive shall be eligible to participate in all
             employee benefit plans offered by the Company (e.g. Life Insurance,
             Medical & Dental Insurance, Travel Accident Insurance, Short Term
             Disability Insurance, Long Term Disability Insurance, Flexible
             Spending Accounts, Regular and Supplemental Accidental Death and
             Disability Insurance, Optional/Supplemental Life Insurance, Stock
             Purchase Savings Plan (401(k)), Employee Stock Purchase Program,
             Employee Stock Ownership Plan, and other personal benefit plans of
             the Company) on a basis which is no less favorable to the Executive
             than the Company may make available to other senior officers of the
             Company; provided, however, that in all events the eligibility and
             other terms of any such plans shall govern the participation of the
             Executive therein.

             (b) Supplemental Executive Retirement Plan: Executive will be
             eligible to participate in the Company's Supplemental Executive
             Retirement Plan (SERP). Under the terms of the SERP, Executive will
             be entitled to receive a nonqualified retirement benefit in
             accordance with the terms and provisions thereof, as administered
             by the Company's Board of Directors.

             (c) Vacation and Sick Leave: Executive shall be entitled to
             vacation and sick leave in accordance with the vacation and sick
             leave policies adopted by the Company from time to time, provided
             that the Executive shall be entitled to no less than five (5) weeks
             of vacation each calendar year. Any vacation shall be at such times
             and for such 


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 6

             periods as shall be mutually agreed upon between the Executive and 
             the Company. The Executive shall be entitled to all public holidays
             observed by the Company.


      VII.   Applicable Taxes: There shall be deducted from any compensation
             payments made under this Agreement any Federal, state and local
             taxes or other amounts required to be withheld by any entity having
             jurisdiction over the matter.


      VIII. Miscellaneous:

             (a) Business Travel and Expenses: Executive shall be reimbursed by
             the Company for reasonable travel and other business expenses, as
             approved by the Company, which are incurred and shall be accounted
             for in accordance with the Company's normal practices and
             procedures for reimbursement of expenses.

             (b) Housing Loan: There will be no change in the terms of
             Executive's outstanding housing loan arrangement with the Company.

             (c) Automobile Expenses: The Company will provide Executive with a
             gross automobile allowance of $1,070 per month (or other such
             monthly amount as is provided to other senior executives of the
             Company in accordance with the provisions of the Company's auto
             allowance program). Such amounts will be disclosed for purposes of
             Securities and Exchange Commission filings as appropriate or
             required.

             (d) Financial Counseling and Legal Services: The Company will
             provide an annual allowance of $10,000 (grossed-up for tax purposes
             using an incremental income tax rate of 45%) for the Executive to
             use for financial counseling, tax preparation and legal 

<PAGE>
Employment Agreement
Covance Inc. and Christopher Kuebler
Page 7

             services. Such amounts will be disclosed for purposes of Securities
             and Exchange Commission filings as appropriate or required.

             (e) Ongoing Non-Exclusivity: Nothing in this Agreement shall
             prevent the Executive from being entitled to receive any additional
             compensation or benefits as approved by the Company's Board of
             Directors and which would amend or supplement the compensation or
             benefits specified in this Agreement.


      IX.    Termination of Employment: Notwithstanding any other provision of
             this Agreement, the employment of the Executive pursuant to this
             Agreement may be terminated by the Company's Board of Directors as
             follows:

             (a) Termination For Cause: Executive may be terminated at any time
             during the Employment Term for "Cause". As used herein, the term
             "Cause" shall mean (i) conviction of the Executive of a felony or
             conviction of a misdemeanor if such misdemeanor involves moral
             turpitude; (ii) Executive's committing any act of gross negligence
             or intentional misconduct in the performance or non-performance of
             his duties as an employee of the Company, including any such
             actions which constitute sexual harassment under applicable laws,
             rules or regulations; (iii) if Executive is not disabled (as
             defined below), a failure or refusal to perform the duties and
             services specified herein for a period of not less than thirty (30)
             days; (iv) any material breach by the Executive of any material
             provision of this Agreement (other than for reasons related only to
             the business performance of the Company or business results
             achieved by the Executive); or (v) misappropriation of Company
             assets or personal dishonesty which causes financial or
             reputational harm with respect to the Company.


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 8

             For purposes of this section, no act or failure to act on
             Executive's part shall be considered to be reason for termination
             for Cause if done, or omitted to be done, by Executive in good
             faith and with the reasonable belief that the action or omission
             was in the best interests of the Company.

             (b) Termination For Disability: At the sole discretion of the
             Company's Board of Directors, Executive may be terminated if the
             Executive is disabled (as defined below) and shall have been absent
             from his duties with the Company on a full-time basis for one
             hundred and twenty (120) consecutive days, and within thirty (30)
             days after written notice by the Company to do so, the Executive
             shall not have returned to the performance of his duties hereunder
             on a full-time basis. In the event of such termination, the Company
             shall make to Executive the payments specified in Section IX(c). As
             used herein, the term "disabled" shall (i) mean that the Executive
             is unable, as a result of a medically determinable physical or
             mental impairment, to perform the duties and services of his
             position, or (ii) have the meaning specified in any disability
             insurance policy maintained by the Company, whichever is more
             favorable to the Executive.

             (c) Severance Benefits: Executive's employment may be terminated
             without Cause if the Company's Board of Directors, upon assessment
             of the general business performance of the Company and the specific
             performance of the Executive, determines that the business needs of
             the Company require the replacement of the Executive, provided that
             in such event:

                (i) Executive shall be entitled to receive three (3) years base
                salary (at the Executive's effective annual rate on the date of
                termination) which amount shall be paid in a lump-sum (net of
                appropriate withholdings) within sixty (60) days of the date of
                termination; and

<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 9


                (ii) Executive shall be entitled to receive an amount equal to
                the product of (A) three (3), (B) the Executive's annual base
                salary in effect at the time of termination, and (C) the higher
                of 65% and the then applicable annual incentive percentage
                specified in the Bonus Plan, which amount shall be paid in a
                lump-sum (net of appropriate withholdings) within sixty (60)
                days of the date of termination; and


                (iii) Executive shall be entitled to continue participation in
                the Company's health and benefit plans (to the extent allowable
                in accordance with the administrative provisions of those plans
                and applicable federal and state law) for a period of up to
                three (3) years or until Executive is covered by a successor
                employer's benefit plans, whichever is sooner.

             (d) Change-of-Control: Should Executive's employment be terminated
             by the Company (for reasons other than Cause), or should
             Executive's duties as President and Chief Executive Officer of the
             Company be diminished in any respect (a "Constructive Termination")
             (either event being referred to herein as an "Event of
             Termination"), within twelve (12) months following a
             "Change-Of-Control" (as defined below), Executive will be entitled
             to receive all of the "Severance Benefits" described in paragraph
             (c) above, and, in addition:


                 (i) All stock options (including the Stock Options), restricted
                stock (including the Restricted Stock), deferred compensation
                and similar benefits which have not become vested on the date of
                an Event of Termination shall become vested upon such Event.


                      (ii) The Executive shall be entitled to receive any
                payments calculated pursuant to Section XVIII hereof.

<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 10

             For purposes of this Agreement, a Change-Of-Control is defined to
be:


                (i) any person (including as such term is used in Section 13(d)
                and 14(d)(2) of the Securities Exchange Act of 1934) becomes the
                beneficial owner, directly or indirectly, of Company securities
                representing 20% or more of the combined voting power of the
                Company's then outstanding securities; or

                (ii) as a result of a proxy contest or contests or other forms
                of contested shareholder votes (in each case either individually
                or in the aggregate), a majority of the individuals elected to
                serve on the Company's Board of Directors are different then the
                individuals who served on the Company's Board of Directors at
                any time within the two years prior to such proxy contest or
                contests or other forms of contested shareholder votes; or

                (iii) the Company's shareholders approve a merger or
                consolidation (where in each case the Company is not the
                survivor thereof), or a sale or disposition of all or
                substantially all of the Company's assets or a plan of partial
                or complete liquidation; or

                (iv) an offerer (other than the Company) purchases shares of the
                Company's common stock pursuant to a tender or exchange offer
                for such shares.


             (e) Except as may be otherwise provided in applicable Company
             compensation & benefit plans, the Company shall not be liable for
             any salary or benefit payments to Executive beyond the date of
             Executive's voluntary termination of employment with the Company.
             In the event of a termination of employment under Sections IX(a) or
             IX(b) above, the Executive shall not be entitled to any
             compensation or other benefits 

<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 11

             not already earned and owing to the Executive on account of his 
             services on the date of such termination of employment.

             (f) Outplacement Assistance: In the event Executive is
             involuntarily terminated or Constructively Terminated as a result
             of a Change of Control or for other reasons that do not constitute
             Cause, the Company shall provide for Executive, at the Company's
             cost, executive outplacement support for one-year following such
             termination.


      X.     Arbitration: In the event of any difference of opinion or dispute
             between the Executive and the Company with respect to the
             construction or interpretation of this Agreement or the alleged
             breach thereof, which cannot be settled amicably by agreement of
             the parties, then such dispute shall be submitted to and determined
             by arbitration by a single arbiter in the city of Trenton, New
             Jersey in accordance with the rules then in effect, of the AMERICAN
             ARBITRATION ASSOCIATION, and judgment upon the award rendered shall
             be final, binding and conclusive upon the parties and may be
             entered in the highest court, state or federal, having
             jurisdiction.

             The Company shall reimburse Executive for all expenses incurred by
             Executive in connection with any arbitration, including the
             reasonable costs and expenses of legal counsel, to the extent the
             arbitration is concluded in the Executive's favor.


      XI.    Confidentiality: The Company possesses and will continue to possess
             trade secrets or other information which has been crafted,
             discovered, developed by or otherwise become known to the Company,
             or in which property rights have been assigned or otherwise
             conveyed to the Company, which information has commercial value
             with respect to the business and operations of the Company or the
             business and operations of 



<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 12

             its subsidiaries or its affiliates, including, but not limited to,
             information regarding sales, costs, customers, employees, products,
             services, apparatus, equipment, processes, formulae, marketing, or
             the organization, business or finances of the Company or its
             subsidiaries or its affiliates, or any information the Executive
             has reason to know the Company would like to treat as confidential
             for any purpose, such as maintaining a competitive advantage or
             avoiding undesirable publicity, whether or not developed by the
             Executive ("Confidential Information"). Unless previously
             authorized in writing or instructed in writing by the Company, the
             Executive will not, from and after the date of employment with the
             Company, directly or indirectly, use for his own benefit or
             purposes, or disclose to, or use for the benefit or purposes of,
             anyone other than the Company or its subsidiaries or affiliates,
             any Confidential Information, unless and until, and then only to
             the extent that, such Confidential Information has (a) been or
             becomes published, or is or becomes generally known in the trade
             through no fault of the Executive, or (b) such information is made
             known and available to the Executive by a third party, who, by such
             disclosure to the Executive does not breach any duty or obligation
             to the Company or its subsidiaries or affiliates.

             In the event the Executive become legally compelled to disclose any
             of the Confidential Information, the Executive will provide the
             Company with prompt notice so that the Company may seek a
             protective order or other appropriate remedy and/or waive
             compliance with the provisions of this Agreement. If, in the
             absence of a protective order or the receipt of a waiver hereunder,
             the Executive is nonetheless legally required to disclose
             Confidential Information to any tribunal or else stand liable for
             contempt or suffer other censure or penalty, the Executive may
             disclose such Confidential Information to such tribunal without
             liability hereunder.


             Upon termination of the Executive's employment with the Company, he
             will deliver to the Company all written embodiments of the
             Confidential Information, including all notes, drawings, records,
             and reports pertaining to work done by the Executive during 



<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 13

             the Employment Term and all other matters of secret or confidential
             nature relating to the Company's business.



      XII.   Non-Competition. The Executive acknowledges that the services to be
             rendered by the Executive to the Company are of a special and
             unusual character, with a unique value to the Company, the loss of
             which cannot adequately be compensated by damages or an action at
             law. In view of the unique value to the Company of such services
             for which the Executive is employed at the Company, because of the
             Confidential Information obtained by, or disclosed to the
             Executive, and as a material inducement to the Company to
             compensate the Executive as well as provide him with additional
             benefits and other good and valuable consideration, the Executive
             covenants and agrees that:


             (a) Unless authorized by the Company's Board of Directors in
             writing, Executive shall not, during the Employment Term and for
             one year after the expiration of the Employment Term (the "Post
             Employment Term", the Employment Term and the Post Employment Term,
             being collectively, the "Period"), become employed by, become a
             director, officer, shareholder or partner of, or to otherwise enter
             into, conduct, or advise any business, whether directly or
             indirectly, which offers services or products in the United States
             and any other geographical regions where the Company, or its
             subsidiaries or its affiliates, is then offering its services or
             products in competition with services or products sold by the
             Company, or its subsidiaries or its affiliates at any time during
             the Period in the United States or such region, including, without
             limitation, the conduct of contract pre-clinical toxicology
             laboratory services, contract biopharmaceutical clinical laboratory
             services, contract bioprocessing or manufacturing services,
             contract drug packaging services, Phase I, II, III or IV clinical
             studies or outcomes or disease management studies (collectively,
             the "Company Services"); provided that the Executive shall not be
             bound by the restrictions contained in this 



<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 14

             Section XII(a) unless the Company has made all payments to the
             Executive which are due and owing to the Executive under this
             Agreement or any plan of the Company, including any equity
             incentive plan or bonus incentive plan of the Company, or
             otherwise; provided, further, that if Executive has been dismissed
             by the Company for Cause, or Executive has voluntarily terminated
             his employment with Covance for any reason or no reason, Executive
             shall not be bound by the provisions of this Section XII(a) during
             the Post Employment Term unless the Company has made to the
             Executive the payments specified in Section IX(c) of this
             Agreement. Nothing herein shall restrict Executive in his
             employment in any capacity by a corporation or entity engaged
             substantially in the manufacture or sale of pharmaceuticals, or any
             other business which does not offer the Company Services. Ownership
             of not more than 1% of the issued and outstanding shares of any
             class of securities of a corporation, the securities of which are
             traded on a national securities exchange or in the over-the-counter
             market, shall not cause Executive to be deemed a shareholder under
             this provision.


              (b) During the Period, the Executive shall not, directly or
             indirectly, solicit, divert or accept any business from any
             customer of the Company, its subsidiaries or affiliates to the
             detriment of any of the foregoing or seek to cause any such
             customers to refrain from doing business with or patronizing the
             Company, its subsidiaries or its affiliates.


                      (c) During the Period, the Executive shall not, directly
             or indirectly, solicit or induce for employment any employee of the
             Company, its subsidiaries or affiliates or otherwise encourage any
             employee of the Company, its subsidiaries or affiliates to leave
             the Company, or any of its subsidiaries or affiliates. For purposes
             of this Agreement, advertisements in trade magazines, use of
             executive search firms and other conventional means of obtaining
             employees shall not be construed as solicitation, inducements or
             encouragement unless the party utilizing such conventional means
             specifically directs 



<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 15

             the efforts at employee(s) with whom the party may not have contact
             pursuant to the terms of this Agreement.

             (d) For purposes of this Agreement, the term "directly or
             indirectly" shall be construed in its broadest sense and shall
             include the activities of the members of the Executive's immediate
             family or any partnership, or as otherwise specified above, and the
             term "customer" shall mean any person or entity to which the
             Company has sold services during the one-year period prior to the
             date the Executive ceased employment with the Company or any
             persons or entities targeted by the Company or contacted for the
             purpose of selling such services during such one-year period which
             Executive knew about or reasonably should have known about.



      XIII.  Ownership of Know-How, Inventions and Other Intellectual Property:
             All the know-how, innovations, inventions, discoveries,
             improvements, procedures, programs, formulae and specifications
             which have been or may be either, directly or indirectly,
             developed, conceived or made by the Executive in connection with
             the Executive's employment with the Company, whether or not in
             concert with other employees or shown or delivered to the Company,
             or any of its subsidiaries or its affiliates, and whether or not
             they are eligible for patent, copyright, trademark, trade secret or
             other legal protection, shall be the exclusive property of the
             Company and the Executive shall, at the Company's request and
             expense, promptly execute any and all documents or instruments
             which may be necessary to evidence such ownership.

             Obligations of this Agreement cover any and all inventions,
             discoveries or improvements, directly or indirectly, conceived or
             made by the Executive in connection with the Executive's employment
             with the Company prior to the date of this Agreement.


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 16

             The Executive will communicate to the Company promptly and fully
             all improvements and inventions he makes or conceives (either
             solely or jointly with others) during the period of the Executive's
             employment with the Company and conceived by the Executive, during
             the Post Employment Term if based on or related to his employment
             at the Company.


      XIV.   Patents: The Executive will, during and after the Period at the
             Company's request and expense but without additional compensation,
             assist the Company and its nominees in every proper way to obtain
             and to vest in the Company or its nominees, title to patents on
             such improvements and inventions in all countries, by executing all
             necessary or desirable documents, including applications for
             patents and assignments thereof.


      XV.    Records and Documents: Except in the performance of his duties as
             an Executive of the Company, the Executive will not at any time or
             in any manner make or cause to be made any copies, pictures,
             duplicates, facsimiles, or other reproductions, recordings,
             abstracts, or summaries of any reports, studies, memoranda,
             correspondence, manuals, customer lists, software, records,
             formulae, plans or other written, printed, or otherwise recorded
             material of any kind whatever belonging to or in the possession of
             the Company or its subsidiaries or affiliates, which may be
             produced or created by the Executive or others or which may come
             into the Executive's possession in the course of his employment, or
             which relate in any manner to the then current or prospective
             business of the Company, its subsidiaries or its affiliates. The
             Executive shall have no right, title or interest in any such
             materials, and the Executive agrees that he has not removed and
             will not remove such materials without the prior written consent of
             the Company or its subsidiaries or affiliates, and that he will
             surrender all such material to 



<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 17

             the Company immediately upon expiration of the Employment Term, or
             at any time prior thereto upon the request of the Company.



      XVI.   Renewal: At the expiration of the initial term or any subsequent
             term, the term of the Agreement may be extended for a period as
             determined by the mutual agreement of the Executive and the
             Company's Board of Directors. Notice of any such extension shall be
             provided to the other party not earlier than six months and not
             later than three months prior to the expiration of the existing
             term. The Company shall be under no obligation to extend the term
             of this Agreement if the Executive has engaged in actions or
             inactions which would constitute reasons to dismiss the Executive
             for Cause. If the Company decides not to renew the term of this
             Agreement (including any renewal after initial the term and any
             subsequent or successor term or terms) for any reason other than
             Cause, the Company shall make to the Executive all of the payments
             specified in Section IX(c) and on the terms of such Section.



      XVII. Other Matters:

             (a) Entire Agreement: This Agreement constitutes the entire
             agreement between the Company and the Executive relating to the
             subject matter hereof, and supersedes any previous agreements,
             commitments and understandings, written or oral, with respect to
             the matters provided herein, except as expressly provided in
             Section XI hereof. As used in this Agreement, terms such as
             "herein", "hereof", "hereto" and similar language shall be
             construed to refer to this entire instrument and not merely the
             paragraph or sentence in which they appear, unless so limited by
             express language.


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 18

             (b) Assignment: Except as set forth below, this Agreement and the
             rights and obligations contained herein shall not be assignable or
             otherwise transferable by either party to this Agreement without
             the prior written consent of the other party to this Agreement.
             Notwithstanding the foregoing, any amounts owing to the Executive
             upon his death with respect to a portion of the Employment Term
             prior to the executive's death shall inure to the benefit of his
             heirs, legatees, personal representatives, executor or
             administrator.

             (c) Notices: Any and all notices provided for under this Agreement
             shall be in writing and hand delivered or sent by first class
             registered or certified mail, postage prepaid, return receipt
             requested, or by reputable overnight courier, or by telecopier
             (with return telecopy), addressed to the Executive at his residence
             or to the Company at its usual place of business or at any other
             address specified in writing and provided to the other party
             hereto, and all such notices shall be deemed effective at the time
             of delivery or at the time delivery is refused by the addressee
             upon presentation.

             (d) Amendments/Waiver: No provision of this Agreement may be
             amended, waived, modified, extended or discharged unless such
             amendment, waiver, extension or discharge is agreed to in writing
             signed by both the Company and the Executive.

             (e) Applicable Law: This Agreement and the rights and obligations 
             of the parties hereunder shall be construed, interpreted, and 
             enforced in accordance with the laws of the State of New Jersey.

             (f) Severability: The Executive hereby expressly agrees that all of
             the covenants in this Agreement are reasonable and necessary in
             order to protect the Company and its business. If any provision or
             any part of any provision of this Agreement shall be invalid or
             unenforceable under applicable law, such part shall be ineffective
             only to the 


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 19

             extent of such invalidity or unenforceability and shall not affect
             in any way the validity or enforceability of the remaining
             provisions of this Agreement, or the remaining parts of such
             provision.

             (g) Successor of Interests: In the event the Company merges or
             consolidates with or into any other corporation or corporations
             where the Company is not the survivor thereof, or sells or
             otherwise transfers substantially all its assets to another
             corporation, the provisions of this Agreement shall be binding upon
             and inure to the benefit of the corporation surviving or resulting
             from the merger or consolidation or to which the assets are sold or
             transferred and, upon any such event, the Company shall obtain the
             assumption of this Agreement by the other corporation. All
             references herein to the Company refer with equal force and effect
             to any corporate or other successor of the corporation that
             acquires directly or indirectly by merger, consolidation, purchase
             or otherwise, all or substantially all of the assets of the
             Company.

             (h) Injunctive Relief: The Executive agrees that the remedies
             available to the Company at law for any breach of any of these
             obligations hereunder may be inadequate, and the Executive
             accordingly agrees and consents that temporary or permanent
             injunctive relief, and/or an order of specific performance, may be
             granted in any proceeding which may be brought to enforce any
             provision hereof, without the necessity of proof of actual damage,
             in addition to any other remedies available to the Company at law.

             (i) Release: In the event Executive is terminated or Constructively
             Terminated without Cause, the obligation of the Company to make to
             Executive any or all of the payments specified under this Agreement
             (including, without limitation, the payments specified in Section
             IX) shall be subject to Exeuctive's execution and delivery to the
             Company of a release in form and substance reasonably satisfactory
             to the Company of all claims, 

<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 20

             demands, suits or actions, whether in law or at equity, Executive
             has or may have relating to or giving rise from such termination or
             Constructive Termination.


      XVIII.  Certain Additional Payments by the Company:

             (a) Anything in this Agreement to the contrary notwithstanding, in
             the event it shall be determined that any payment or distribution
             by, to or for the benefit of the Executive, whether made under this
             Agreement or otherwise (a "Payment"), would be subject to the
             excise tax imposed by Section 4999 of the Internal Revenue Code of
             1986, as amended (the "Excise Tax"), then the Executive shall be
             entitled to receive an additional payment (a "Gross-Up Payment") in
             an amount such that after payment by the Executive of all taxes
             (including any Excise Tax) imposed upon the Gross-Up Payment, the
             Executive retains an amount of the Gross-Up Payment equal to the
             Excise Tax imposed upon the Payments.


              (b) All determinations required to be made under this Section
             XVIII, including whether a Gross-Up Payment is required and the
             amount of such Gross-Up Payment, shall be made by the accounting
             firm utilized by the Company for the preparation of its annual
             external financial statements (the "Accounting Firm") which shall
             provide detailed supporting calculations both to the Company and
             the Executive within 30 days of the Event of Termination, if
             applicable, or such earlier time as is requested by the Company.
             The Gross-Up Payment, if any, as determined pursuant to this
             Section XVIII(b), shall be paid to the Executive within 10 days of
             the receipt of the Accounting Firm's determination. Any
             determination by the Accounting Firm shall be binding upon the
             Company and the Executive. If subsequent final determinations of
             the Excise Tax made by the Internal Revenue Service give rise to
             additional Excise Tax, then additional Gross-Up Payments shall be
             made by the Company to the Executive within 10 days after notice is
             received by the Company of such final determination.


<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 21

             (c) The Executive shall notify the Company in writing of any claim
             by the Internal Revenue Service that, if successful, would require
             the payment by the Company of a Gross-Up Payment. Such notification
             shall be given as soon as practicable but no later than 10 business
             days after the Executive knows of such claim. The Executive shall
             not pay such claim prior to the expiration of the thirty-day period
             following the date on which he gives such notice to the Company (or
             such shorter period ending on the date that any payment of taxes
             with respect to such claim is due). If the Company notifies the
             Executive in writing prior to the expiration of such period that it
             desires to contest such claim, the Executive shall:

                   (i) give the Company any information reasonably requested by
                   the Company relating to such claim,

                   (ii) take such action in connection with contesting such
                   claim as the Company shall reasonably request in writing from
                   time to time, including, without limitation, accepting legal
                   representation with respect to such claim by an attorney
                   selected by the Company,

                   (iii) cooperate with the Company in good faith in order
                   effectively to contest such claim, and

                   (iv) permit the Company to participate in any proceedings
                   relating to such claim;


             provided, however, that the Company shall bear all costs and
             expenses incurred in connection with such contest and shall
             indemnify and hold the Executive harmless, on an after-tax basis,
             for any Excise Tax or income tax imposed as a result of such
             contest or representation and payment of costs and expenses. The
             Company shall control all 

<PAGE>

Employment Agreement
Covance Inc. and Christopher Kuebler
Page 22

             proceedings taken in connection with such contest. The Company may,
             at its sole option, either direct the Executive to pay the tax
             claimed and sue for a refund or contest the claim in any
             permissible manner, and the Executive agrees to prosecute such
             contest to a determination before any administrative tribunal, in a
             court of initial jurisdiction and in one or more appellate courts,
             as the Company shall determine; provided, however, that if the
             Company directs the Executive to pay such claim and sue for a
             refund, the Company shall advance the amount of such payment to the
             Executive on an interest-free basis and shall indemnify and hold
             the Executive harmless, on an after-tax basis, from any Excise Tax
             or income tax imposed with respect to such advance.


             (d) If, after the receipt by the Executive of an amount advanced by
             the Company pursuant to subsection (c), the Executive becomes
             entitled to receive any refund with respect to such claim, the
             Executive shall promptly pay to the Company the amount of such
             refund (together with any interest paid or credited thereon after
             taxes applicable thereto). If, after the receipt by the Executive
             of an amount advanced by the Company pursuant to subsection (c), a
             final determination is made that the Executive shall not be
             entitled to any refund with respect to such claim, then such
             advance shall be forgiven and shall not be required to be repaid
             and the amount of such advance shall offset the amount of Gross-Up
             Payment required to be paid.



      XIX.   Condition Subsequent: This Agreement shall be null and void and of
             no force or effect if the proposed spin-off of the Company from
             Corning Incorporated described in the Company's Form F10 dated
             September 20, 1996 and filed with the Securities & Exchange
             Commission is not consummated.

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Employment Agreement
Covance Inc. and Christopher Kuebler
Page 23

           IN WITNESS WHEREOF, the Company has caused this Agreement to be
executed on its own behalf and has caused its corporate seal to be affixed, and
the Executive has executed this Agreement on his own behalf intending to be
legally bound, as of the date first written above.


                                    COVANCE INC.


                             By: /s/ Van C. Campbell
                                 -----------------------------
                                 Van C. Campbell
                                 Chairman

ATTEST:

   /s/ Jeffrey S. Hurwitz
   -----------------------------
        Secretary

                                   EXECUTIVE:

                           /s/ Christopher A. Kuebler
                           -------------------------------
                             Christopher A. Kuebler





                                                                  Exhibit 10.15



                                   Schedule A


       Pursuant to Item 601(a)(4), Instruction 2, of Regulation S-K, the Company
has not filed the Executive Employment Letters for the following named
executives:

                             Mr. Richard J. Andrews
                             Mr. Michael G. Wokasch
                             Mr. James D. Utterback

       Such letters are substantially similar to the Executive Employment Letter
for Dr. Kim D. Lamon, attached hereto.



                                      A-1
<PAGE>


                              [Covance letterhead]




20 November 1996



Dr. Kim D. Lamon
25 Governors Lane
Princeton, New Jersey  08540

           Re:       Employment Letter Agreement (the "Agreement")

Dear Kim:

As we move toward establishing Covance Inc. (formerly Corning Pharmaceutical
Services Inc.) ("Covance") as an independent publicly owned company, it is my
pleasure to formally confirm that you are an important member of my management
team, and, as such, I would like to communicate to you certain compensation
matters which will be part of the executive policies which govern Covance once
the impending spin-off from Corning Incorporated ("Corning") and Corning
Clinical Laboratories ("CCL") is completed. The terms and conditions of this
letter supersede and replace any and all previous offer letters, employment
agreements or oral representations regarding employment made to you (other than
any confidentiality or non-competition agreements you have signed, which shall
continue in full force and effect and in addition to any of the provisions
contained in this Agreement).

Position

As a Corporate Senior Vice President of Covance and Group President of Covance's
clinical and periapproval operations, your duties include managing the domestic
and international clinical and periapproval operations of Covance, and such
other duties as may be incidental to the foregoing or as the Chief Executive
Officer of Covance (the "CEO") or his designee may assign to you. You will 
report to the CEO or his designee.

Salary and Bonus

Your 1997 salary will be $340,000 per year effective at the time of the
completion of the spin-off of Covance from Corning and CCL described in
Covance's Form 10 dated September 20, 1996 and filed with the Securities and
Exchange Commission (the "Spin-Off"). Your next scheduled merit increase will
occur on January 1, 1998.



<PAGE>


You will participate in the Covance 1997 Compensation Plan (the "Bonus Plan").
The Bonus Plan provides that upon satisfaction of certain financial goals for
both Covance and your business unit established by the Covance Board of
Directors, you shall receive an annual incentive equal to 55% of your annual
base salary at the time the goals are set for such year; provided, however, that
your payout, if any, under the Bonus Plan for 1997 shall be computed using your
salary specified above. The Bonus Plan also provides that you may earn up to
110% of your then current annual base salary for such year if Covance and your
business unit have outstanding results, again as determined by the Covance Board
of Directors. Any annual incentive compensation in excess of 55% of your annual
base salary may be paid to you in stock options as determined by the Covance
Board of Directors, the details of which would be specified in a Stock Option
Agreement to be entered into pursuant to Covance's Employee Equity Participation
Program. Actual awards will be determined by the Covance Board of Directors
after the end of the applicable performance year and shall be paid to you
shortly thereafter. The annual incentive targets may be increased, but not
decreased, while you are employed by Covance.

Pension Plan

You are not vested in any pension benefit under Corning's pension. In its place,
a supplemental executive retirement plan ("SERP") is being developed for the
senior executives of Covance in which you will participate. The SERP will be a
non-qualified, unfunded retirement plan designed to provide retirement benefits
to you starting at age 60 with provisions enabling you to begin receiving
reduced benefits it you retire at age 55. A copy of the plan will be sent you as
soon as it is approved and available.

Investment and Benefit Plans

All of your current Covance employee benefit plans (other than those plans
offering Corning equities, such as the Employee Stock Purchase Plan) will
continue in effect after the Spin-Off with such modifications as Covance deems
necessary or advisable. You will continue to be eligible to participate in these
Covance plans (e.g., medical, dental, disability, life insurance, 401(k) savings
plan, ESOP, employee stock purchase plan) in accordance with the terms and
conditions of those plans.

Auto and Financial Counseling Allowance

You will continue to receive a gross monthly auto allowance of $1,070 per month.
In addition, you will also be eligible to participate in other perquisites
and/or benefits programs as are offered to all other senior executives of
Covance as a class. These include a tax/financial counseling allowance of $6,000
per year under the terms of the Covance plan. Any expenses actually incurred
under this plan will be grossed up for tax purposes at an incremental income tax
rate of 45%.


                                       2
<PAGE>


Existing Options and Other Long Term Incentives

At the time of the Spin-Off, your existing Corning long-term incentives (stock
options and restricted stock) will be treated in accordance with the terms
outlined below:

           1.        All Corning stock options (other than CPP-6 stock options)
                     will be converted into Covance stock options. The
                     conversion will take place in such a way to preserve the
                     inherent gain you have in the Corning stock options at the
                     time of the Spin-Off. In addition, all other option terms
                     (e.g. term of option, vesting dates, ISO status, forfeiture
                     provisions, etc.) will be preserved. Specific details
                     regarding the conversion of your stock options will be
                     provided to you at a later date.

           2.        Two-thirds of the Corning CPP-6 stock options will be
                     converted into Covance stock options (under conditions
                     similar to those noted above). The remaining one-third of
                     your Corning CPP-6 stock options will be forfeited and
                     canceled.


           3.        Specific details regarding the treatment of all of your
                     outstanding Corning restricted shares will be provided to
                     you at a later date.

Future Equity Awards

You may be awarded from time to time additional compensation (such as stock
options or restricted stock) pursuant to Covance's Employee Equity Participation
Program or any additional or replacement incentive compensation or long-term
compensation program established by Covance for its senior officers. Any awards
under such programs, except as provided below, shall be at such levels or in
such amounts as Covance's Board of Directors deems, in its sole discretion,
appropriate for your position and the performance of your duties.

In conjunction with your first year participation in Covance's Employee Equity
Participation Program, Covance shall grant to you, on the terms set forth below,
that number of shares of Covance's common stock, subject to certain restrictions
(the "Restricted Stock"), and options to purchase Covance's common stock (the
"Stock Options"), that have in the aggregate a present value equal to not less
than $447,750 (the "First Grant Value"). The First Grant Value shall consist of
Stock Options and Restricted Stock in the ratio of three Stock Options for every
share of Restricted Stock. Each Stock Option shall be worth a present value
amount equal to the product of (i) the fair market value of Covance's common
stock and (ii) .33. The fair market value of Covance's common stock shall be
determined based on the weighted average per share price of each trade of
Covance's common stock occurring during normal trading hours of the first five
days of "regular way" trading after completion of the Spin-Off. The rights,
obligations and other conditions of the Restricted Stock and the Stock Options
shall be as specified in that certain Incentive Stock Agreement and Stock Option
Agreement, in each case between you and Covance.


                                       3

<PAGE>

Severance

Except as specified below under the paragraph headed "Change of Control",
Covance guarantees that should you be involuntarily terminated for reasons other
than for Cause, you will receive an amount equal to the sum of (a) two years
base salary (payable on the normal payroll cycle) determined at the time of
termination, and (b) two years of the annual incentive bonus (payable on the
normal bonus cycles) in an amount equal for each such year to the product of
your base salary in effect at termination and 55% (the sum of (a) and (b) being,
collectively, the "Termination Payments").

"Cause" shall mean (i) your convictions of a felony or a misdemeanor if such
misdemeanor involves moral turpitude; (ii) your committing any act of gross
negligence or intentional misconduct in the performance or non-performance of
your duties as an employee of Covance or its affiliates, including, any actions
which constitute sexual harassment under applicable laws, rules or regulations;
(iii) your failure to perform your duties assigned for a period of thirty (30)
or more days unless such failure is caused by an Extended Disability; or (iv)
misappropriation of assets, personal dishonesty or intentional misrepresentation
of facts which may cause Covance or its affiliates financial or reputational
harm.

Should such involuntary termination occur because of an Extended Disability, and
not for any other reason that constitutes Cause, for 120 consecutive days where
you have not returned to your duties on a full-time basis after the expiration
of such 120 day period within 30 days after written notice of termination is
given to you, Covance shall pay to you the Termination Payments at the times
specified above.

Extended Disability shall (i) mean you are unable, as a result of a medically
determinable physical or mental impairment, to perform the duties and services
of your position, or (ii) have the meaning specified in any disability insurance
policy maintained by Covance, whichever is more favorable to you.

Except as may be otherwise provided in applicable Covance compensation and
benefit plans, Covance shall not be liable for any salary or benefit payments to
you beyond the date of your voluntary termination of employment with Covance. In
the event of a termination of employment for Cause or Extended Disability, you
shall not be entitled to any compensation or other benefits not already earned
and owing to you on account of your services on the date of such termination of
employment except as provided above with respect to a termination for Extended
Disability.

Medical, dental, disability and life insurance will be continued, to the extent
they are not otherwise prohibited under the respective plans, while you are
receiving the Termination Payments.


                                       4
<PAGE>


Change of Control

Should your employment be terminated by Covance (for reasons other than Cause),
or should your duties as Corporate Senior Vice President be diminished in any
respect (a "Constructive Termination") (either event being referred to herein as
an "Event of Termination"), in each case within 12 months following a
Change-of-Control (as defined below), you will be entitled to a lump sum payment
equal to the sum of (1) the product of (a) 3 and (b) your base annual salary in
effect at the time of your involuntary or Constructive Termination and (2) the
product of (a) 3 and (b) number that is 55% of your base annual salary in effect
at the time of your involuntary or Constructive Termination. Such payment will
be made within 60 days of your involuntary or Constructive Termination. In
addition to, and as a result of, the foregoing (i) all of your stock options
(including the Stock Options), restricted stock (including the Restricted
Stock), deferred compensation and similar benefits which have not become vested
on the date of an Event of Termination shall become vested upon such Event and
(ii) you shall be entitled to receive any payments calculated pursuant to the
paragraph headed "Certain Additional Payments by Covance".

For purposes of this Agreement, a Change-of-Control is defined to be:

           (i) any person (including as such term is used in Section 13(d) and
14(d)(2) of the Securities Exchange Act of 1934) becomes the beneficial owner,
directly or indirectly, of Covance's securities representing 20% or more of the
combined voting power of Covance's then outstanding securities; or

           (ii) as a result of a proxy contest or contests or other forms of
contested shareholder votes (in each case either individually or in the
aggregate), a majority of the individuals elected to serve on Covance's Board of
Directors are different then the individuals who served on Covance's Board of
Directors at any time within the two years prior to such proxy contest or
contests or other forms of contested shareholder votes (in each case either
individually or in the aggregate); or

           (iii) Covance shareholders approve a merger, or consolidation (where
in each case Covance is not the survivor thereof), or sale or disposition of all
or substantially all of Covance's assets or a plan or partial or complete
liquidation; or

           (iv) an offerer (other than Covance) purchases shares of the
Company's common stock pursuant to a tender or exchange offer for such shares.

Medical, dental, disability and life insurance will be continued, to the extent
they are not otherwise prohibited under the respective plans, until you find
other employment but not longer than three years from the date of your
involuntary or Constructive Termination following a Change-of-Control.


                                       5
<PAGE>



Certain Additional Payments by Covance

           (a) Anything in this Agreement to the contrary notwithstanding, in
the event it shall be determined that any payment or distribution by, to or for
the benefit of you, whether made under this Agreement or otherwise (a
"Payment"), would be subject to the excise tax imposed by Section 4999 of the
Internal Revenue Code of 1986, as amended (the "Excise Tax"), then you shall be
entitled to receive an additional payment (a "Gross-Up Payment") in an amount
such that after payment by you of all taxes (including any Excise Tax) imposed
upon the Gross-Up Payment, you retain an amount of the Gross-Up Payment equal to
the Excise Tax imposed upon the Payments.

           (b) All determinations required to be made under these provisions,
including whether a Gross-Up Payment is required and the amount of such Gross-Up
Payment, shall be made by the accounting firm utilized by Covance for the
preparation of its annual external financial statements (the "Accounting Firm")
which shall provide detailed supporting calculations both to Covance and you
within 30 days of the Event of Termination, if applicable, or such earlier time
as is requested by Covance. The Gross-Up Payment, if any, as determined pursuant
to this Paragraph (b), shall be paid to you within 10 days of the receipt of the
Accounting Firm's determination. Any determination by the Accounting Firm shall
be binding upon Covance and you. If subsequent final determinations of the
Excise Tax made by the Internal Revenue Service give rise to additional Excise
Tax, then additional Gross-Up Payments shall be made by Covance to you within 10
days after the notice is received by Covance of such final determination.

           (c) You shall notify Covance in writing of any claim by the Internal
Revenue Service that, if successful, would require the payment by Covance of a
Gross-Up Payment. Such notification shall be given as soon as practicable but no
later than 10 business days after you know of such claim. You shall not pay such
claim prior to the expiration of the thirty-day period following the date on
which you give such notice to Covance (or such shorter period ending on the date
that any payment of taxes with respect to such claim is due). If Covance
notifies you in writing prior to the expiration of such period that it desires
to contest such claim, you shall:

                       (i) give Covance any information reasonably requested by
           Covance relating too such claim,

                       (ii) take such action in connection with contesting such
           claims as Covance shall reasonably request in writing from time to
           time, including, without limitation, accepting legal representation
           with respect to such claim by an attorney selected by Covance,

                       (iii) cooperate with Covance in good faith in order
           effectively to contest such claim, and

                       (iv) permit Covance to participate in any proceedings
           relating to such claim;


                                       6

<PAGE>

provided, however, that Covance shall bear all costs and expenses incurred in
connection with such contest and shall indemnify and hold you harmless, on an
after-tax basis, for any Excise Tax or income tax imposed as a result of such
contest or representation and payment of costs and expenses. Covance shall
control all proceedings taken in connection with such contest. Covance may, at
its sole option, either direct you to pay the tax claimed and sue for a refund
or contest the claim in any permissible manner, and you agree to prosecute such
contest to a determination before any administrative tribunal, in a court of
initial jurisdiction and in one or more appellate courts, as Covance shall
determine; provided, however, that if Covance directs you to pay such claim and
sue for a refund, Covance shall advance the amount of such payment to you on an
interest-free basis and shall indemnify and hold you harmless, on an after-tax
basis, from any Excise Tax or income tax imposed with respect to such advance.

           (d) If , after the receipt by you of an amount advanced by Covance
pursuant to Paragraph (c), you become entitled to receive any refund with
respect to such claim, you shall promptly pay to Covance the amount of such
refund (together with any interest paid or credited thereon after taxes
applicable thereto). If, after the receipt by you of an amount advanced by
Covance pursuant to Paragraph (c), a final determination is made that you shall
not be entitled to any refund with respect to such claim, then such advance
shall be forgiven and shall not be required to be repaid and the amount of such
advance shall offset the amount of Gross-Up Payment required to be paid.

Confidentiality

Covance possesses and will continue to possess trade secrets or other
information which has been created, discovered, developed by or otherwise become
known to Covance, or in which property rights have been assigned or otherwise
conveyed to Covance, which information has commercial value with respect to the
business and operations of Covance or the business and operations of its
subsidiaries or its affiliates, including, but not limited to, information
regarding sales, costs, customers, employees, products, services, apparatus,
equipment, processes, formulae, marketing, or the organization, business or
finances of Covance or its subsidiaries or its affiliates, or any information
you have reason to know Covance would like to treat as confidential for any
purpose, such as maintaining a competitive advantage or avoiding undesirable
publicity, whether or not developed by you ("Confidential Information"). Unless
previously authorized in writing or instructed in writing by Covance, you will
not, from and after the date of employment with Covance, directly or indirectly,
use for your own benefit or purposes, or disclose to, or use for the benefit or
purposes of, anyone other than Covance or its subsidiaries or affiliates, any
Confidential Information, unless and until, and then only to the extent that,
such Confidential Information has (a) been or becomes published, or is or
becomes generally known in the trade through no fault of you, or (b) such
information is made known and available to you by a third party, who, by such
disclosure to you does not breach any duty or obligation to Covance or its
subsidiaries or affiliates.

In the event you become legally compelled to disclose any of the Confidential
Information, you will provide Covance with prompt notice so that Covance may
seek a protective order or other appropriate remedy and/or waive compliance with
the provisions of this Agreement. If, 


                                       7

<PAGE>

in the absence of a protective order or the receipt of a waiver hereunder, you
are nonetheless legally required to disclose Confidential Information to any
tribunal or else stand liable for contempt or suffer other censure or penalty,
you may disclose such Confidential Information to such tribunal without
liability hereunder.

Upon termination of your employment with Covance, you will deliver to Covance
all written embodiments of the Confidential Information, including all notes,
drawings, records, reports, pertaining to work done by you during your
employment with Covance and all other matters of secret or confidential nature
relating to Covance's business.

Non-Competition

You acknowledge that the services to be rendered by you to Covance are of a
special and unusual character, with a unique value to Covance, the loss of which
cannot adequately be compensated by damages or an action at law. In view of the
unique value to Covance of such services for which you are employed at Covance,
because of the Confidential Information obtained by, or disclosed to you, and as
a material inducement to Covance to compensate you as well as provide you with
additional benefits and other good and valuable consideration, you covenant and
agree that:

           (a) Unless authorized by Covance's Board of Directors in writing, you
shall not, during your employment with Covance and for one year after the
expiration of your employment with Covance (the "Post Employment Term", your
employment with Covance and the Post Employment Term, being, collectively, the
"Period"), become employed by, become a director, officer, shareholder or
partner of, or to otherwise enter into, conduct, or advise any business, whether
directly or indirectly, which offers services or products in the United States
and any other geographical regions where Covance, or its subsidiaries or its
affiliates, is then offering its services or products in competition with
services or products sold by Covance, or its subsidiaries or its affiliates at
any time during the Period in the United States or such region, including,
without limitation, the conduct of contract pre-clinical toxicology laboratory
services, contract biopharmaceutical clinical laboratory services, contract
bioprocessing or manufacturing services, contract drug packaging services, Phase
I, II, III or IV clinical studies or outcomes or disease management studies
(collectively, the "Covance Services"); provided that you shall not be bound by
the restrictions contained in this provision (a) unless Covance has made all
payments to you which are due and owing to you under this Agreement or any plan
or bonus or incentive plan of Covance, including any equity incentive or bonus
incentive plan of Covance, or otherwise; provided, further, that if you have
been dismissed by Covance for Cause or you have voluntarily terminated your
employment with Covance for any reason or no reason, you shall not be bound by
the foregoing provisions of this paragraph (a) during the Post Employment Term
unless Covance has made to you the payments specified above under "Severance".
Nothing herein shall restrict you in your employment in any capacity by a
corporation or entity engaged substantially in the manufacture or sale of
pharmaceuticals, or any other business which does not offer Covance Services.
Ownership of not more than 1% of the issued and outstanding shares of any


                                       8
<PAGE>



class of securities of a corporation, the securities of which are traded on a
national securities exchange or in the over-the-counter market, shall not cause
you to be deemed a shareholder under this provision.

           (b) During the Period, you shall not, directly or indirectly,
solicit, divert or accept any business from any customer of Covance, its
subsidiaries or affiliates to the detriment of any of the foregoing or seek to
cause any such customers to refrain from doing business with or patronizing
Covance, its subsidiaries or its affiliates.

           (c) During the Period, you shall not, directly or indirectly, solicit
or induce for employment any employee of Covance or any of its subsidiaries or
affiliates or otherwise encourage any employee of Covance or any of its
subsidiaries or affiliates to leave Covance, or any of its subsidiaries or
affiliates. For purposes of this Agreement, advertisements in trade magazines,
use of executive search firms and other conventional means of obtaining
employees shall not be construed as solicitation, inducements or encouragement
unless the party utilizing such conventional means specifically directs the
efforts at employee(s) with whom the party may not have contact pursuant to the
terms of this Agreement.

           (d) For purposes of this Agreement, the term "directly or indirectly"
shall be construed in its broadest sense and shall include the activities of the
members of your immediate family or any partnership, or as otherwise specified
above, and the term "customer" shall mean any person or entity to which Covance
has sold services during the one-year period prior to the date you ceased
employment with Covance or any persons or entities targeted by Covance or
contacted for the purpose of selling such services during such one-year period
which you knew about or reasonably should have known about.

Ownership of Know-How, Inventions and Other Intellectual Property

All the know-how, innovations, inventions, discoveries, improvements,
procedures, programs, formulae and specifications which have been or may be
either, directly or indirectly, developed, conceived or made by you in
connection with your employment with Covance, whether or not in concert with
other employees or shown or delivered to Covance or any of its subsidiaries or
its affiliates, and whether or not they are eligible for patent, copyright,
trademark, trade secret or other legal protection, shall be the exclusive
property of Covance and you shall, at Covance's request and expense, promptly
execute any and all documents or instruments which may be necessary to evidence
such ownership.

Obligations of this Agreement cover any and all inventions, discoveries or
improvements, directly or indirectly, conceived or made by you in connection
with your employment with Covance prior to the date of this Agreement.

You will communicate to Covance promptly and fully all improvements and
inventions you make or conceive (either solely or jointly with others) during
the period of your employment


                                       9
<PAGE>


with Covance and conceived by you during the Post Employment Term if based on or
related to your employment at Covance.

Patents

You will, during and after the Period, at Covance's request and expense but
without additional compensation, assist Covance and its nominees in every proper
way to obtain and to vest in Covance or its nominees, title to patents on such
improvements and inventions in all countries, by executing all necessary or
desirable documents, including applications for patents and assignments thereof.

Records and Documents

Except in the performance of your duties as an employee of Covance, you will not
at any time or in any manner make or cause to be made any copies, pictures,
duplicates, facsimiles, or other reproductions, recordings, abstracts, or
summaries of any reports, studies, memoranda, correspondence, manuals, customer
lists, software, records, formulae, plans, or other written, printed, or
otherwise recorded material of any kind whatever belonging to or in the
possession of Covance or its subsidiaries or affiliates, which may be produced
or created by you or others, or which may come into your possession in the
course of your employment, or which relate in any manner to the then current or
prospective business of Covance, its subsidiaries or its affiliates. You shall
have no right, title or interest in any such materials, and you agree that you
have not removed and will not remove such materials without the prior written
consent of Covance or its subsidiaries or affiliates, as applicable, and that
you will surrender all such material to Covance immediately upon your
termination or departure from Covance, or at any time prior thereto upon the
request of Covance.

Injunctive Relief

You agree that the remedies available to Covance at law for any breach of any of
your obligations under this Agreement may be inadequate, and you accordingly
agree and consent that temporary or permanent injunctive relief, and/or an order
of specific performance, may be granted in any proceeding which may be brought
to enforce any provision hereof, without the necessity of proof of actual
damage, in addition to any other remedies available to Covance at law.

Outplacement

In the event you are involuntarily or Constructively Terminated as a result of a
Change-of-Control or for other reasons that do not constitute Cause, Covance
shall provide for you, at Covance's cost, executive outplacement support for
one-year following such termination.


                                       10

<PAGE>


Condition Subsequent

This Agreement shall be null and void and of no force or effect if the Spin-Off
is not consummated.

Release

In the event you are terminated or Constructively Terminated without Cause, the
obligation of Covance to make to you any or all of the payments specified under
this Agreement (including, without limitation, the Termination Payments or the
payments specified under the paragraph headed "Change of Control") shall be
subject to your execution and delivery to Covance of a release in form and
substance reasonably satisfactory to Covance of all claims, demands, suits or
actions, whether in law or at equity, you have or may have relating to or giving
rise from such termination or Constructive Termination.

General

The terms of your outstanding housing loan with Covance remain unchanged. In
addition, provisions of employment relating to health benefits, vacation and
reimbursement for business expenses, professional dues, etc. remain unchanged
and will be administered in accordance with company policies, as they may be
amended, modified or supplemented from time to time. This Agreement shall be
governed by and construed in accordance with the laws of the State of New
Jersey.

The failure of either party at any time to require performance by the other
party of any provision hereof shall not affect in any way the full right to
require such performance at any time thereafter, nor shall a waiver by either
party of a breach of any provision hereof be taken or held to be a waiver of
future performance under the provision itself.

You hereby expressly agree that all of the covenants in this Agreement are
reasonable and necessary in order to protect Covance and its business. If any
provision or any part of any provision of this Agreement shall be invalid or
unenforceable under applicable law, such part shall be ineffective only to the
extent of such invalidity or unenforceability and shall not affect in any way
the validity or enforceability of the remaining provisions of this Agreement, or
the remaining parts of such provision.

This Agreement shall be binding on and inure to the benefit of the parties
hereto and their heirs, executors, legal representatives, successors and
assigns. Except in the event of a transfer to a successor corporation or other
entity or affiliate of Covance, neither party shall have the right to assign its
rights or delegate its obligations, or all or any portion of its rights or
interests under this Agreement without the prior written consent of the other
party hereto.

Any notice, request, demand, or other communication required or permitted by
this Agreement shall be deemed to be properly given if delivered by hand or when
mailed 


                                       11

<PAGE>

certified, registered or first class mail or overnight courier with postage
or shipping charge prepaid, addressed to Covance at 210 Carnegie Center,
Princeton, New Jersey 08540, Attention: CEO and to you at your address specified
above, and all such notices shall be deemed effective at the time of delivery or
at the time delivery is refused by the addressee upon participation. The
addresses for the purpose of this Paragraph may be changed only by giving
written notice of such change in the manner provided herein for giving notices.

The captions of the Paragraphs herein are inserted as a matter of convenience
only and in no way define, limit or describe the scope of this Agreement or any
provisions hereof.

This Agreement sets forth the entire agreement and understanding between the
parties hereto as to the subject matter hereof, and as such supersedes in its
entirety any existing agreement, whether oral or written, between you and
Covance, except as expressly otherwise provided to the contrary under this
Agreement.

This Agreement may be amended only by a written instrument signed by both
parties hereto making specific reference to this Agreement and expressing the
plan or intention to modify it.

Please indicate your agreement with the terms and conditions of this Agreement
by signing one copy of this Agreement and returning it to my attention.

Very truly yours,

/s/ Christopher A. Kuebler

Christopher A. Kuebler
President and CEO

CAK\JSH\rh


Accepted as of the date first above specified:



By:   /s/ Dr. Kim D. Lamon
      -----------------------------------------
          Dr. Kim D. Lamon


                                       12





                                                                    Exhibit 23





Consent of Independent Accountants


      We hereby consent to the incorporation by reference in the Registration
Statement on Forms S-8 (Nos. 333-18485, 333-18487 and 333-18493) of Covance Inc.
of our report dated January 27, 1997 appearing on page 39 of this Annual Report
on Form 10-K.




Price Waterhouse LLP
Morristown, New Jersey

March 24, 1997

<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
This schedule contains summary financial information extracted from the 1996
audited financial statements of Covance and is qualified in its entirety by
reference to Covance 1996 form 10-K
</LEGEND>
<CIK>                         0001023131
<NAME>                        Covance
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                      25,416,000
<SECURITIES>                                         0
<RECEIVABLES>                               93,700,000
<ALLOWANCES>                                         0
<INVENTORY>                                 16,410,000
<CURRENT-ASSETS>                           217,894,000
<PP&E>                                     167,809,000
<DEPRECIATION>                             137,078,000
<TOTAL-ASSETS>                             451,047,000
<CURRENT-LIABILITIES>                      151,948,000
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       571,000
<OTHER-SE>                                 110,133,000
<TOTAL-LIABILITY-AND-EQUITY>               451,047,000
<SALES>                                    494,828,000
<TOTAL-REVENUES>                           494,828,000
<CGS>                                      324,345,000
<TOTAL-COSTS>                              456,967,000
<OTHER-EXPENSES>                             7,907,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           6,791,000
<INCOME-PRETAX>                             29,954,000
<INCOME-TAX>                                17,377,000
<INCOME-CONTINUING>                         12,716,000
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                12,716,000
<EPS-PRIMARY>                                     0.22
<EPS-DILUTED>                                        0
        


</TABLE>


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