SIGMA ALDRICH CORP
10-K, 1998-03-27
CHEMICALS & ALLIED PRODUCTS
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                    SECURITIES AND EXCHANGE COMMISSION
                        Washington, D.C. 20549
                              FORM 10-K

[x]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934
     For the fiscal year ended December 31, 1997
                               -----------------
                                  OR
[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934
     For the transition period from                 to
                                   ----------------    -----------------

                    Commission file number    0-8135

                        SIGMA-ALDRICH CORPORATION
- -------------------------------------------------------------------------------
         (Exact name of Registrant as specified in its charter)

              Delaware                                  43-1050617
  -------------------------------         -----------------------------------
  (State or other jurisdiction of         (I.R.S. Employer Identification No.)
   incorporation or organization)

3050 Spruce Street, St. Louis, Missouri                     63103
- ----------------------------------------                 ----------
(Address of principal executive offices)                 (Zip Code)

Registrant's telephone number, including area code          314-771-5765
                                                   --------------------------
Securities registered pursuant to Section 12(b) of the Act: None
Securities registered pursuant to Section 12(g) of the Act:

                           Common Stock, $1.00 par value
- -------------------------------------------------------------------------------
                                  (Title of Class)

     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 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]

     Aggregate market value of the voting stock held by non-affiliates
of the Registrant:

       $4,030,403,488                             March 6, 1998
       --------------                           -----------------
           Value                                Date of Valuation

     Number of shares of the registrant's common stock, $1.00 par
value, outstanding as of March 6, 1998 was 100,486,867.

The following documents are incorporated by reference in the Parts of
Form 10-K indicated below:

                                           Parts of Form 10-K into which
Documents Incorporated by Reference        Incorporated
- -----------------------------------        ------------------------------
Pages 12-27 of the Annual Report to
  Shareholders for the year ended
  December 31, 1997                         Parts I, II and IV

Proxy Statement for the 1998 Annual
  Meeting of Shareholders                   Part III

The Index to Exhibits is located on page F-3 of this report.

This document contains forward-looking statements which involve assumptions
regarding Company operations and future prospects.  Although the Company 
believes its expectations are based on reasonable assumptions, such
statements are subject to risk and uncertainty, including, among others,
certain economic, political and technology factors.  Caution should be
taken that these factors could cause the actual results to differ from those
stated or implied in this and other Company communications.

                                   PART I
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Item 1. Business.
- -------------------------------------------------------------------------------

     Sigma-Aldrich Corporation (hereinafter referred to as the
"Company", which term includes all consolidated subsidiaries of the
Company) has two lines of business: the production and sale of a broad
range of biochemicals, organic and inorganic chemicals, radiolabeled
chemicals, diagnostic reagents, chromatography products and related
products (hereinafter referred to as "chemical products"), and the
manufacture and sale of metal components for strut, cable tray, pipe
support, telecommunication systems and electrical enclosures
(hereinafter referred to as "metal products"  or "B-Line").  Its
principal executive offices are located at 3050 Spruce Street, St.
Louis, Missouri  63103.

     The Company was incorporated under the laws of the State of
Delaware in May 1975.  Effective July 31, 1975 ("Reorganization"), the
Company succeeded, as a reporting company, Sigma International, Ltd.,
the predecessor of Sigma Chemical Company ("Sigma"), and Aldrich
Chemical Company, Inc. ("Aldrich"), both of which had operated
continuously for more than 20 years prior to the Reorganization.
Effective December 9, 1980, B-Line Systems, Inc.("B-Line"), previously
a subsidiary of Sigma, became a subsidiary of the Company.

     Effective May 5, 1993, the Company acquired the net assets and
business of Supelco, Inc.("Supelco"), a worldwide supplier of
chromatography products used in chemical research and production, from
Rohm and Haas Company.

(a) Chemical Products.
- -------------------------------------------------------------------------------

1)   Products:

     The Company distributes approximately 83,000 chemical products
for use primarily in research and development, in the diagnosis of
disease, and as specialty chemicals for manufacturing. In laboratory
applications, the Company's products are used in the fields of
biochemistry, synthetic chemistry, quality control and testing,
immunology, hematology, pharmacology, microbiology, neurology and
endocrinology and in the studies of life processes.  Sigma diagnostic
products are used in the detection of heart, liver and kidney diseases
and various metabolic disorders.  Certain of these diagnostic products
are used in measuring concentrations of various naturally occurring
substances in the blood, indicative of certain pathological
conditions.  The diagnostic products are used in manual, semi-
automated and automated testing procedures.  The Company also offers,
through a partnership with Amelung (a German manufacturer), analyzers
that measure blood clotting.  Supelco offers a full line of
chromatography products and application technologies for analyzing and
separating complex chemical mixtures.  The line includes items for the
collection and preparation of various samples for further chemical
analysis, gas and liquid chromatography, reference standards and
related laboratory products.  In June 1997 Sigma-Aldrich entered into a
partnership with AlliedSignal (75% Sigma-Aldrich, 25% AlliedSignal),
whereby Sigma-Aldrich agreed to sell and market Riedel-de Haen
laboratory chemicals.  Riedel-de Haen is a major European supplier of 
laboratory products.  These products complement the Company's 
existing range of high quality research products and are expected 
to strengthen its market position.

     Aldrich also offers approximately 75,000 esoteric chemicals as a
special service to customers interested in screening them for
application in many areas (such as medicine and agriculture).  This
area accounts for less than 1% of the Company's sales.

     Because of continuing developments in the field of research,
there can be no assurance of a continuing market for each of the
Company's products.  However, through a continuing review of technical
literature, along with constant communications with customers, the
Company keeps abreast of the trends in research and diagnostic
techniques.  This information, along with its own research technology,
determines the Company's development of improved and/or additional
products.

2)   Production and Purchasing:

     The Company has chemical production facilities in Milwaukee and
Sheboygan, Wisconsin (Aldrich); St. Louis, Missouri (Sigma);
Bellefonte, Pennsylvania (Supelco); Germany (Aldrich Chemie GmbH & Co.
K.G., RdH Laborchemikalien GmbH and Co., K.G.); Israel (Sigma Israel 
Chemicals Ltd.); Switzerland (Fluka Chemie AG, "Fluka"), and
the United Kingdom (Sigma-Aldrich Company Ltd.). A minor amount of
production is done by some of the Company's other subsidiaries.
Biochemicals and diagnostic reagents are primarily produced by
extraction and purification from yeasts, bacteria and other naturally
occurring animal and plant sources. Organic and inorganic chemicals
and radiolabeled chemicals are primarily produced by synthesis.
Chromatography media and columns are produced using proprietary
chemical synthesis and proprietary preparation processes.  Similar
processes are used for filtration and sample collection processes.

     Of the approximately 83,000 products listed in the Sigma,
Aldrich, Fluka, Riedel-de Haen and Supelco catalogs, the Company
produced approximately 35,000 which accounted for 46% of the net sales
of chemical products for the year ended December 31, 1997.  The
remainder of products were purchased from a large number of sources
either under contract or in the open market.

     No one supplier accounts for as much as 10% of the Company's
chemical purchases.  The Company has generally been able to obtain
adequate supplies of products and materials to meet its needs.

     Whether a product is produced by the Company or purchased from
outside suppliers, it is subjected to quality control procedures,
including the verification of purity, prior to final packaging.  This
is done by a combined staff of approximately 280 chemists and lab
technicians utilizing sophisticated scientific equipment.

3)   Distribution and Sales:

     The Company markets its chemical products through separate sales
and marketing units for research, fine chemicals and diagnostics and
distributes over 2,800,000 comprehensive catalogs for the Sigma,
Aldrich, Fluka, Riedel-de Haen and Supelco brands to customers and 
potential customers throughout the world.  This is supplemented by 
certain specialty catalogs, by advertising in chemical and other 
scientific journals, by direct mail distribution of in-house publications 
and special product brochures and by personal visits by sales and technical
representatives with customers.

     For customer convenience, Sigma packages approximately 250
combinations of certain individual products in diagnostic kit form.  A
diagnostic kit contains products which, when used in a series of
manual and/or automated testing procedures, aid in detecting
particular conditions or diseases.  Diagnostic products accounted for
approximately 10% of the Company's sales of chemical products in the
year ended December 31, 1997.

     During the year ended December 31, 1997, products were sold to
approximately 145,000 customers, including hospitals, universities and
clinical laboratories as well as private and governmental research
laboratories. The majority of the Company's sales are small orders in
laboratory quantities averaging approximately $225.  The Company also
makes its chemical products available in larger-than-normal laboratory
quantities for use in manufacturing.  Sales of these products
accounted for approximately 15% of chemical sales in 1997.  During the
year ended December 31, 1997, no one customer and no one product
accounted for more than 1% of the net sales of chemical products.

     Customers and potential customers, wherever located, are
encouraged to contact the Company by telephone ("collect" or on
"toll-free" WATS lines) or via our homepage on the World Wide Web for
technical staff consultation or for placing orders.  Order processing,
shipping, invoicing and product inventory are computerized.  Shipments
are made seven days a week from St. Louis, six days a week from
Milwaukee, United Kingdom, Germany, Israel and Japan and five days a
week from all other locations.  The Company strives to ship its
products to customers on the same day an order is received and carries
significant inventories to maintain this policy.

4)   International Operations:

     In the year ended December 31, 1997, 55% of the Company's net
sales of chemical products were to customers located in foreign
countries.  These sales were made directly by Sigma, Aldrich, Fluka,
Riedel-de Haen and Supelco, through distributors and by subsidiaries 
organized in Argentina, Australia, Austria, Belgium, Brazil, Canada, Czech
Republic, Finland, France, Germany, Greece, Hungary, India, Ireland,
Israel, Italy, Japan, Mexico, The Netherlands, Norway, Poland, Russia,
Singapore, South Africa, South Korea, Spain, Sweden, Switzerland and
United Kingdom.  Several foreign subsidiaries also have production
facilities.

     For sales with final destinations in an international market, the
Company has a Foreign Sales Corporation ("FSC") subsidiary which
provides certain Federal income tax advantages.  The effect of the tax
rules governing the FSC is to lower the effective Federal income tax
rate on export income.  The Company intends to continue to comply with
the provisions of the Internal Revenue Code relating to FSCs.

     The Company's international operations and domestic export sales
are subject to currency revaluations, changes in tariff restrictions
and restrictive regulations of foreign governments, among other
factors inherent in these operations.  The Company is unable to
predict the extent to which its business may be affected in the future
by these matters.  During the year ended December 31, 1997,
approximately 15% of the Company's  domestic operations' chemical
purchases were from international suppliers.  Additional information
regarding international operations is included in Note 10 to the
consolidated financial statements on pages 24 and 25 of the 1997
Annual Report which is incorporated herein by reference.

5)   Patents and Trademarks:

     The Company's patents are not material to its operations.  The
Company's significant trademarks are the brand names, "Sigma",
"Aldrich", "Fluka", "Riedel-de Haen", "Supelco" and "B-Line" and
marketing units, "Sigma-Aldrich Research", "Sigma-Aldrich Fine
Chemicals"  and "Sigma Diagnostics".  Their related logos, which have
various expiration dates, are expected to be renewed indefinitely.

6)   Regulations:

     The Company engages principally in the business of selling
products which are not foods or food additives, drugs or cosmetics
within the meaning of the Federal Food, Drug and Cosmetic Act, as
amended (the "Act").  A limited number of the Company's products,
including in-vitro diagnostic reagents, are subject to labeling,
manufacturing and other provisions of the Act.  The Company believes
it is in compliance in all material respects with the applicable
regulations.

     The Company believes that it is in compliance in all material
respects with Federal, state and local regulations relating to the
manufacture, sale and distribution of its products.  The following are
brief summaries of some of the Federal laws and regulations which may
have an impact on the Company's business.  These summaries are only
illustrative of the extensive regulatory requirements of the Federal,
state and local governments and are not intended to provide the
specific details of each law or regulation.

     The Clean Air Act (CAA), as amended, and the regulations
promulgated thereunder, regulates the emission of harmful pollutants
to the air outside of the work environment.  Federal or state
regulatory agencies may require companies to acquire permits, perform
monitoring and install control equipment for certain pollutants.

     The Clean Water Act (CWA), as amended, and the regulations
promulgated thereunder, regulates the discharge of harmful pollutants
into the waters of the United States.  Federal or state regulatory
agencies may require companies to acquire permits, perform monitoring
and to treat waste water before discharge to the waters of the United
States or a Publicly Owned Treatment Works (POTW).

     The Occupational Safety and Health Act of 1970 (OSHA), including
the Hazard Communication Standard ("Right to Know"), and the
regulations promulgated thereunder, requires the labeling of hazardous
substance containers, the supplying of Material Safety Data Sheets
("MSDS") on hazardous products to customers and hazardous substances
the employee may be exposed to in the workplace, the training of the
employees in the handling of hazardous substances and the use of the
MSDS, along with other health and safety programs.

     The Resource Conservation and Recovery Act of 1976 (RCRA), as
amended, and the regulations promulgated thereunder, requires certain
procedures regarding the treatment, storage and disposal of hazardous
waste.

     The Comprehensive Environmental Response, Compensation and
Liability Act of 1980 (CERCLA) and the Superfund Amendments and
Reauthorization Act of 1986 (SARA), and the regulations promulgated
thereunder, require notification of certain chemical spills and
notification to state and local emergency response groups of the
availability of MSDS and the quantities of hazardous materials in the
Company's possession.

     The Toxic Substances Control Act of 1976 (TSCA), requires
reporting, testing and pre-manufacture notification procedures for
certain chemicals.  Exemptions are provided from some of these
requirements with respect to chemicals manufactured in small
quantities solely for research and development use.

     The Department of Transportation (DOT) has promulgated
regulations pursuant to the Hazardous Materials Transportation Act,
referred to as the Hazardous Material Regulations (HMR), which set
forth the requirements for hazard labeling, classification and
packaging of chemicals, shipment modes and other goods destined for
shipment in interstate commerce.

     Approximately 1,100 products, for which sales are immaterial to
the total sales of the Company, are subject to control by either the
Drug Enforcement Administration ("DEA") or the Nuclear Regulatory
Commission ("NRC").  The DEA and NRC have issued licenses to several
Company sites to permit importation, manufacture, research, analysis,
distribution and export of certain products.  The Company screens
customer orders involving products regulated by the NRC and the DEA to
verify that a license, if necessary, has been obtained.

     Approximately 500 products, for which sales are immaterial to the
total sales of the Company, are subject to control by the Department
of Commerce ("DOC").  The DOC has promulgated the Export
Administration Regulations pursuant to the Export Administration Act
of 1979, as amended, to regulate the export of certain products by
requiring a special export license.

(b) Metal Products.
- -------------------------------------------------------------------------------

     Components for strut, cable tray and pipe support systems are
manufactured by B-Line at its facilities in Highland and Troy,
Illinois; Norcross, Georgia; Reno, Nevada and Sherman, Texas.
Electrical and electronic enclosures are manufactured at facilities in
Aurora, Colorado; Portland, Oregon; Modesto, California; and Sherman,
Texas.  Components and complete systems used to support
telecommunications apparatus and cabling are manufactured at the plant
in Reno, Nevada.

     Strut and pipe support systems are metal frameworks and related
accessories used in industry to support pipes, lighting fixtures and
conduit.  Strut systems can be easily assembled with bolts and
spring-loaded nuts, eliminating the necessity of drilling or welding
associated with other types of frameworks.  B-Line manufactures and
sells a wide variety of components for these systems, including steel
struts rolled from coils, stamped steel fittings for interconnecting
struts, shelf-supporting brackets, pipe and conduit supporting clamps,
and accessories for the installation of strut systems on location.
Pipe hangers are generally used in conjunction with strut systems to
support heavy and light duty piping runs in the mechanical, plumbing
and refrigeration industry.  The principal materials used by B-Line in
manufacturing are coils of steel and extruded aluminum which B-Line
purchases from a number of suppliers.  No one supplier is essential to
B-Line's production.  A limited number of components for strut and
pipe support systems, including bolts and nuts and certain forged and
cast components, are purchased from numerous sources and sold by
B-Line as accessories to its own manufactured products.

     Cable tray systems are continuous networks of ventilated or solid
trays used primarily in the routing of power cables and control wiring
in power plant or industrial installations.  The systems are generally
hung from ceilings or supported by strut frameworks.  Cable tray is
produced from either extruded aluminum or roll-formed steel in various
configurations to offer versatility to designers and installers.  Non-
metallic strut and cable tray products, which are used primarily in
corrosive environments, are also available.

     Telecommunications equipment racks and cable runways are
manufactured from aluminum or steel.  The systems are used in
commercial installations as well as installed in the central offices
of telephone operating companies.  As switching equipment is changed
and upgraded, the systems are replaced.

     Electrical and electronic enclosures are metal enclosure boxes,
generally manufactured from steel, that are used to contain and
protect electric meters, fuse and circuit breaker boards and
electrical panels.  These products are used in industrial, commercial
and residential installations.

     B-Line also manufactures a line of lightweight support fasteners
to be used in commercial and industrial facilities to attach
electrical and acoustical fixtures.

     B-Line sells primarily to electrical, mechanical and
telecommunications wholesalers.  Products are marketed directly by
district sales offices and by regional sales managers through
independent manufacturers' representatives.  Products are shipped to
customers from the Highland and Troy, Illinois; Norcross, Georgia;
Reno, Nevada; Portland, Oregon; Modesto, California; Sherman, Texas;
and Aurora, Colorado plants, from two regional warehouses and 35
consigned stock locations.  B-Line's products are advertised in trade
journals and by circulation of comprehensive catalogs.

(c)  Competition.
- -------------------------------------------------------------------------------

     Substantial competition exists in all of the Company's marketing
and production areas.  Although no comprehensive statistics are
available, the Company believes it is a major supplier of organic
chemicals and biochemicals for research and for diagnostic testing
procedures involving enzymes and of chromatography products for
analyzing and separating complex chemical mixtures.  A few
competitors, like the Company, offer thousands of chemicals and stock
and analyze most of their products.  While the Company generally
offers a larger number of products, some of the Company's products are
unusual and have relatively little demand.  In addition, there are
many competitors who offer a limited quantity of chemicals, and
several companies compete with the Company by offering thousands of
chemicals, although few of them stock or analyze substantially all of
the chemicals they offer for sale.

     The Company believes its B-Line subsidiary to be among the three
largest producers of metal strut framing, pipe hangers, cable tray
component systems and enclosures, although reliable industry
statistics are not available.

     In all product areas the Company competes primarily on the basis
of customer service, product quality and price.

(d) Employees.
- -------------------------------------------------------------------------------

     The Company employed 6,666 persons as of December 31, 1997.  Of
these, 5,202 were engaged in production and distribution of chemical
products.  The B-Line subsidiary employed 1,464 persons.  The total
number of persons employed within the United States was 4,546, with
the balance employed by the international subsidiaries.  The Company
employed over 1,800 persons who have degrees in chemistry,
biochemistry, engineering or other scientific disciplines, including
approximately 250 with Ph.D. degrees.

     Employees engaged in chemical production, research and
distribution are not represented by any organized labor group.
B-Line's production workers at the Highland and Troy, Illinois
facilities are members of the International Association of Machinists
and Aerospace Workers, District No. 9 (AFL-CIO).  The labor agreement
covering these employees expires November 14, 1999.  B-Line's
production workers at the Norcross, Georgia facility are members of
the United Food and Commercial Workers International (AFL-CIO), Retail
Clerks Union Local 1063.  The labor agreement covering these employees
expires June 13, 1998.

(e) Back-log of Orders.
- -------------------------------------------------------------------------------

     The majority of orders for chemical products in laboratory
quantities are shipped from inventory, resulting in no back-log of
these orders.  However, individual items may occasionally be out of
stock.  These items are shipped as soon as they become available.
Some orders for larger-than-normal laboratory quantities are for
future delivery.  On December 31, 1997 and 1996, the back-log of firm
orders and orders for future delivery of chemical products was not
significant.  The Company expects that substantially all of the
December 31, 1997 back-log will be shipped during 1998.

      On December 31, 1997 and 1996, the back-log of orders at B-Line
was not significant.  B-Line expects that substantially all of the
December 31, 1997 back-log will be shipped during 1998.

(f) Information as to Industry Segments.
- ------------------------------------------------------------------------------

     Information concerning industry segments for the years ended
December 31, 1997, 1996 and 1995, is located in Note 10 to the
consolidated financial statements on pages 24 and 25 of the 1997
Annual Report which is incorporated herein by reference.

(g) Executive Officers of the Registrant.
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     Information regarding executive officers is contained in Part
III, Item 10, and is incorporated herein by reference.

Item 2.  Properties.
- -------------------------------------------------------------------------------

     The Company's primary chemical production facilities are located
in St. Louis, Missouri; Milwaukee and Sheboygan, Wisconsin;
Bellefonte, Pennsylvania and Buchs, Switzerland.  In St. Louis, the
Company owns a 328,000 square foot building used for manufacturing, a
complex of buildings aggregating 383,000 square feet which is used for
warehousing and production, a 75,000 square foot building used for
warehousing, a 23,000 square foot building used for warehousing and
office space, a 98,000 square foot building used for production,
quality control and packaging and a 19,000 square foot production
facility. The Company owns a 280,000 square foot building in St. Louis
which is being partially utilized to provide additional quality
control, packaging and warehousing capacity.  Also in St. Louis, the
Company owns 30 acres upon which is located a 240,000 square foot
administration and distribution facility, in which its principal
executive offices are located, and a 175,000 square foot diagnostic
production and office building.  The company also leases a warehouse 
in St. Louis, Missouri and an administration building in Brentwood, 
Missouri.  In Milwaukee, the Company owns a 178,000 square foot building 
which is used for manufacturing, warehousing and offices, a 100,000 
square foot building which is used for additional manufacturing and 
warehousing and a complex of buildings aggregating 322,000 square 
feet which is used primarily for warehousing and distribution.  Also 
in Milwaukee, the Company owns a 152,000 square foot building which 
is used for warehousing, a 56,000 square foot administration facility and a
627,000 square foot building which is being renovated for use as a
distribution facility.  The Company also owns 513 acres in Sheboygan,
Wisconsin, upon which are located multiple buildings totaling 332,000
square feet for production and packaging.  The Company also owns a 
23,000 square foot administration, production and warehousing facility
in Natick, Massachusetts.  Fluka owns a 13 acre site in Buchs, Switzerland, 
upon which are located its primary production facilities. Approximately 
357,000 square feet of owned production, warehousing and office facilities 
are at this site.  In Greenville, Illinois, the Company owns 555 acres 
of land for future development of biochemical production facilities.  
Supelco owns 71 acres near Bellefonte, Pennsylvania, upon which is 
located a 153,000 square foot building used for manufacturing, warehousing, 
research and administration.  Riedel-de Haen leases a 61,000 square foot 
production facility and an administration building in Seelze, Germany.

     The Company's B-Line manufacturing business is located in
Highland and Troy, Illinois; Norcross, Georgia; Sherman, Texas; Reno,
Nevada; Portland, Oregon;  Modesto, California; and Aurora, Colorado.
B-Line owns a 273,000 square foot building in Highland, Illinois, a
55,000 square foot building in Troy, Illinois, a 115,000 square foot
building in Portland, Oregon, a 238,000 square foot building in
Sherman, Texas, a 173,000 square foot building in Reno, Nevada and a
102,000 square foot building in Modesto, California.  B-Line leases a
100,000 square foot facility in Norcross, Georgia and a 113,000 square
foot facility in Aurora, Colorado.

     The Company also owns a 173,000 square foot warehouse and
distribution facility in Allentown, Pennsylvania, and leases a
warehouse in Chicago, Illinois and in Connecticut under a short-term
lease.  Manufacturing and/or warehousing facilities are also owned or
leased in the United Kingdom, Australia, Finland, France, Germany,
Israel, Japan, Mexico, Norway, Scotland, South Korea, Sweden and Switzerland.
Sales offices are leased in all other locations.

     The Company considers the properties to be well maintained, in
sound condition and repair, and adequate for its present needs.  The
Company expects to continue to expand its production and distribution
capabilities in select markets.

Item 3. Legal Proceedings.
- -------------------------------------------------------------------------------

     There are no material pending legal proceedings.

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

     No matters were submitted by the Registrant to the stockholders
for a vote during the fourth quarter of 1997.

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

     Information concerning market price of the Registrant's Common
Stock and related shareholder matters for the years ended December 31,
1997 and 1996, is located on page 12 of the 1997 Annual Report which
is incorporated herein by reference.

     As of March 6, 1998, there were 2,000 record holders of the
Registrant's Common Stock.


Items 6 through 8. Selected Financial Data, Management's Discussion
- ---------------------------------------------------------------------------
and Analysis of Financial Condition and Results of Operations, Qualitative
- ------------------------------------------------------------------------------
and Quantitative, Market Risk Disclosure and Financial Statements and 
- ------------------------------------------------------------------------------
Supplementary Data.
- ------------------

     The information required by Items 6 through 8 is incorporated
herein by reference to pages 12-27 of the 1997 Annual Report.  See
Index to Financial Statements and Schedules on page F-1 of this
report.  Those pages of the Company's 1997 Annual Report listed in
such Index or referred to in Items 1(a)(4), 1(f) and 5 are
incorporated herein by reference.


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

     Not applicable.

                                  PART III
- -------------------------------------------------------------------------------
Item 10.  Directors and Executive Officers of the Registrant.
- -------------------------------------------------------------------------------
     Information under the captions "Nominees for Board of Directors"
and "Security Ownership of Directors, Executive Officers and Principal
Beneficial Owners" of the 1998 Proxy Statement is incorporated herein
by reference.

     The executive officers of the Registrant are:

     Name of Executive Officer   Age  Positions and Offices Held
     -------------------------   ---  --------------------------
     Larry S. Blazevich          50   Vice President, Information Services
     Terry R. Colvin             42   Vice President, Human Resources
     Carl T. Cori                61   Chairman of the Board and Chief
                                      Executive Officer
     Peter A. Gleich             52   Vice President and Chief Financial
                                      Officer
     David R. Harvey             58   President and Chief Operating Officer
     James W. Meteer             47   Vice President, Quality
     Karen J. Miller             40   Controller
     Kirk A. Richter             51   Treasurer
     Thomas M. Tallarico         53   Vice President and Secretary

There is no family relationship between any of the officers.

Mr. Blazevich joined Sigma-Aldrich in April 1996 as Director of
Information Services and was elected Vice President, Information
Services in June 1996.  Previously, Mr. Blazevich was employed with
Thomas and Betts for sixteen years where he served as Vice President
of Information Services from 1988-1996.

Mr. Colvin was elected Vice President, Human Resources of the Company 
in March 1998.  He served as Vice President, Human Resources at Sigma 
from 1995 to 1998 and as Director, Human Resources at B-Line from 
January 1987 to December 1994.

Dr. Cori has been Chairman and Chief Executive Officer of the Company
for more than five years.  He served as President of the Company for
more than five years until March 1995.

Mr. Gleich was elected Treasurer and Chief Financial Officer in
November 1994.  He has been a Vice President of the Company for more
than five years.  He was Secretary of the Company for more than five
years until November 1994.

Dr. Harvey has been Chief Operating Officer of the Company for more
than five years.  He was elected President of the Company in March
1995, after serving as Executive Vice President for more than five
years.

Mr. Meteer was elected Vice President, Quality of the Company in September 
1996 after serving as Director of Quality since 1995.  Previously, Mr. 
Meteer was a Vice President of Supelco from 1993-1995.  He held several 
positions within Supelco/Rohm & Haas from 1988-1993.

Ms. Miller was elected Controller of the Company in May 1997.  Previously, 
Ms. Miller was employed as Controller of several divisions at Allergan,
Inc. for more than five years until February 1997.

Mr. Richter was elected Treasurer in May 1997 after serving as
Controller for more than five years.

Mr. Tallarico was elected Secretary in November 1994.  He has been a
Vice President of the Company for more than five years and served as
Treasurer and Chief Financial Officer of the Company from May 1991 to
November 1994.

The present terms of office of the officers will expire when the next
annual meeting of the Directors is held and their successors are
elected.


Item 11.  Executive Compensation.
- -------------------------------------------------------------------------------

     Information under the captions "Director Compensation and
Transactions" and "Information Concerning Executive Compensation" of
the 1998 Proxy Statement is incorporated herein by reference.

Item 12.  Security Ownership of Certain Beneficial Owners and Management.
- -------------------------------------------------------------------------------

     Information under the caption "Security Ownership of Directors,
Executive Officers and Principal Beneficial Owners" of the 1998 Proxy
Statement is incorporated herein by reference.

Item 13.  Certain Relationships and Related Transactions.
- -------------------------------------------------------------------------------

     Information under the caption "Director Compensation and
Transactions" of the 1998 Proxy Statement is incorporated herein by
reference.


                                   PART IV
- --------------------------------------------------------------------------------
Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K.
- --------------------------------------------------------------------------------
(a)  Documents filed as part of this report:

     1.  Financial Statements.

          See Index to Financial Statements and Schedules on page F-1
          of this report.  Those pages of the Company's 1997 Annual
          Report listed in such Index or referred to in Items 1(a)(4),
          1(f) and 5 are incorporated herein by reference.

     2.  Financial Statement Schedules.

          See Index to Financial Statements and Schedules on page
          F-1 of this report.

     3.  Exhibits.

          See Index to Exhibits on page F-3 of this report.

(b)   Reports on Form 8-K:

      No reports on Form 8-K have been filed during the last quarter of
      the period covered by this report.


                                 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.

                         SIGMA-ALDRICH CORPORATION
                         -------------------------
                               (Registrant)


              By    /s/     Peter A. Gleich             March 27, 1998
                    -------------------------------     --------------
                    Peter A. Gleich, Vice President          Date
                      and Chief Financial Officer


     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose
signature appears below constitutes and appoints Carl T. Cori, Peter
A. Gleich, David R. Harvey, Karen J. Miller, Kirk A. Richter and
Thomas M. Tallarico and each of them (with full power to each of them
to act alone), his true and lawful attorneys-in-fact and agents, with
full power of substitution and resubstitution, for him and in his
name, place and stead, in any and all capacities, to sign any or all
amendments (including post-effective amendments) to this report, and
to file the same, with all exhibits thereto and other documents in
connection therewith with the Securities and Exchange Commission,
granting unto said attorneys-in-fact and agents, and each of them,
full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as
fully to all intents and purposes as he might or could do in person,
hereby ratifying and confirming all that said attorneys-in-fact and
agents, or any of them, or their substitutes, may lawfully do or cause
to be done by virtue hereof.

     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.

              By   /s/     Carl T. Cori                          March 27, 1998
                  ----------------------------------------       --------------
                  Carl T. Cori, Director, Chairman of the             Date
                    Board and Chief Executive Officer

              By   /s/     David R. Harvey                       March 27, 1998
                  ----------------------------------------       --------------
                  David R. Harvey, Director, President and            Date
                    Chief Operating Officer

              By   /s/     Peter A. Gleich                       March 27, 1998
                  ----------------------------------------       --------------
                  Peter A. Gleich, Vice President and                 Date
                    Chief Financial Officer

              By   /s/     Karen J. Miller                       March 27, 1998
                  ----------------------------------------       --------------
                  Karen J. Miller, Controller                         Date

              By   /s/     Kirk A. Richter                       March 27, 1998
                  ----------------------------------------       --------------
                  Kirk A. Richter, Treasurer                          Date

              By   /s/     Thomas M. Tallarico                   March 27, 1998
                  ---------------------------------------       --------------
                  Thomas M. Tallarico, Vice President                 Date
                    and Secretary

              By   /s/     David M. Kipnis                       March 27, 1998
                  ---------------------------------------        --------------
                  David M. Kipnis, Director                           Date

              By   /s/     Andrew E. Newman                      March 27, 1998
                  --------------------------------------         --------------
                  Andrew E. Newman, Director                          Date

              By   /s/     Jerome W. Sandweiss                   March 27, 1998
                  --------------------------------------         --------------
                  Jerome W. Sandweiss, Director                       Date




                   SIGMA-ALDRICH CORPORATION AND SUBSIDIARIES
                  INDEX TO FINANCIAL STATEMENTS AND SCHEDULES
- -------------------------------------------------------------------------------


                                                    Page Number
                                                     Reference
                                                   -------------
                                                   Annual Report
                                                  to Shareholders
                                                  ---------------
Annual financial data for the years
 1997, 1996, 1995, 1994 and 1993                       12

Management's discussion of financial
 condition and results of operations                   13

Market Risk Disclosure                                 15

FINANCIAL STATEMENTS:

 Consolidated Balance Sheets
    December 31, 1997 and 1996                         17

 Consolidated statements for the years
    ended December 31, 1997, 1996 and 1995
      Income                                           16
      Stockholders' Equity                             18
      Cash Flows                                       19

 Notes to consolidated financial statements            20

 Report of independent public accountants              16


FINANCIAL STATEMENT SCHEDULES:

Schedules are not submitted because they are
not applicable, not required or because the
information is included in the consolidated
financial statements or notes thereto.



                     CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
- --------------------------------------------------------------------------------
As independent public accountants, we hereby consent to the
incorporation of our report incorporated by reference in this Form 10-
K, into the Company's previously filed registration statements on Form
S-8, file numbers 33-24415 and 33-62541.




ARTHUR ANDERSEN LLP

St. Louis, Missouri,
March 27, 1998


                                INDEX TO EXHIBITS
                                -----------------

These Exhibits are numbered in accordance with the Exhibit Table of
Item 6.01 of Regulation S-K:

    Exhibit                                    Reference
    -------                                    ---------

(3) Certificate of Incorporation and By-Laws:

 (a)  Certificate of Incorporation and         Incorporated by reference to
      Amendments                               Exhibit 3(a) of Form 10-K filed 
                                               for the year ended December 31, 
                                               1991, Commission File Number 
                                               0-8135.

 (b)  By-Laws as amended May 1997              See Exhibit 3(b). 
                                               
(4) Instruments Defining the Rights of
    Shareholders, Including Indentures:

 (a)  Certificate of Incorporation             See Exhibit 3(a) above.
      and Amendments

 (b)  By-Laws as amended May 1997              See Exhibit 3(b) above.

 (c)  The Company agrees to furnish to the
      Securities and Exchange Commission upon
      request pursuant to Item 601(b)(4)(iii)
      of Regulation S-K copies of instruments
      defining the rights of holders of long-term
      debt of the Company and its consolidated
      subsidiaries.

(10) Material Contracts:

 (a)  Third Amendment and Restatement          Incorporated by reference to 
      of the Incentive Stock Bonus Plan*       Exhibit 10(d) of Form 10-K filed 
                                               for the year ended December 31, 
                                               1996, Commission File Number 
                                               0-8135.

 (b)  Share Option Plan of 1987*               Incorporated by reference to 
                                               Exhibit 10(d) of Form 10-K filed 
                                               for the year ended December 
                                               31, 1992, Commission File 
                                               Number 0-8135.

 (c)  First Amendment to Share Option          Incorporated by reference to 
      Plan of 1987*                            Exhibit 10(e) of Form 10-K filed 
                                               for the year ended December 31, 
                                               1992, Commission File Number
                                               0-8135.

 (d)  Second Amendment to Share Option         Incorporated by reference to
      Plan of 1987*                            Exhibit 10(f) of Form 10-K filed 
                                               for the year ended December 31, 
                                               1994, Commission File Number 
                                               0-8135.

 (e)  Employment Agreement with                Incorporated by reference to
      Carl T. Cori* (Similar Employment        Exhibit 10 (f) of Form 10-K filed
      Agreements also exist with Larry S.      for the year ended December 31, 
      Blazevich, Terry R. Colvin, Peter        1992 Commission File Number
      A. Gleich, David R. Harvey, James        0-8135.
      W. Meteer, Karen J. Miller, Kirk A. 
      Richter and Thomas M. Tallarico)

 (f)  Letter re:  Consultation Services        Incorporated by reference to 
      with Dr. David M. Kipnis*                Exhibit 10 (g) of Form 10-K 
                                               filed for the
                                               year ended December 31, 1992,
                                               Commission File Number 0-8135.

 (g)  Share Option Plan of 1995*               Incorporated by reference to 
                                               Appendix A of the Company's 
                                               Definitive Proxy Statement filed 
                                               March 30, 1995, Commission
                                               File Number 0-8135.

(11) Statement Regarding Computation           Incorporated by reference to 
     of Per Share Earnings                     the Share Earnings information 
                                               on net income per share included
                                               in Note 1 to the Company's
                                               1997 financial statements
                                               filed as Exhibit 13 below.


(13) Pages 12-28 of the Annual Report          See Exhibit 13.
     to Shareholders for the year ended 
     December 31, 1997

(21) Subsidiaries of Registrant                See Exhibit 21.

(23) Consent of Independent Public             Page F-2 of this report.
     Accountants

(27) Financial Data Schedule                   See Exhibit 27.

*Represents management contract or compensatory plan or arrangement
required to be filed as an exhibit pursuant to Item 14(c) of Form 10-K.


                           SIGMA-ALDRICH CORPORATION              Exhibit 3(b)
                           (A Delaware Corporation)

                                  BY-LAWS
                                  -------

                         ARTICLE I.    OFFICES

      1.01.  Registered Office.  The registered office shall be
      in the City of Wilmington, County of New Castle, State of
      Delaware.

      1.02.  Other Offices.  The Corporation may also have
      offices at such other places both within and without the State of
      Delaware as the Board of Directors may from time to time
      determine or the business of the Corporation may require.


                       ARTICLE II.   SHAREHOLDERS

    * 2.01.  Annual Meeting.  The annual meeting of the
      shareholders shall be held on the first Tuesday of May of each
      year commencing in 1976 or on such other date as may be fixed by
      or under the authority of the Board of Directors, for the purpose
      of electing directors and for the transaction of such other
      business as may properly come before the meeting.  If the day
      fixed for the annual meeting shall be a legal holiday in the
      State of Delaware, such meeting shall be held on the next
      succeeding business day.  If the election of directors shall not
      be held on the day designated herein, or fixed as herein
      provided, for any annual meeting of the shareholders, or at any
      adjournment thereof, the Board of Directors shall cause the
      election to be held at a special meeting of the shareholders as
      soon thereafter as is convenient.

  **  2.01A.  Notice of Shareholder Business.

            (a)  At an annual meeting of shareholders, only
            such business shall be conducted, and only such proposals
            shall be acted upon, as shall have been properly brought
            before the meeting (i) pursuant to the Corporation's notice
            of meeting, (ii) by or at the direction of the Board of
            Directors, or (iii) by any shareholder of the Corporation
            who is a shareholder of record at the time of giving of the
            notice provided for in this By-Law, who shall be entitled to
            vote at such meeting and who complies with the notice
            procedures set forth in this By-Law.

            (b)  For a proposal to be properly brought before
            an annual meeting by a shareholder pursuant to clause (iii)
            of paragraph (a) of this By-Law, the shareholder must have
            given timely notice thereof in writing to the Secretary of
            the Corporation.  To be timely, a shareholder's notice must
            be delivered to or mailed and received at the principal
            executive offices of the Corporation not less than 10 days
            prior to the first anniversary of the preceding year's
            annual meeting; provided, however, that in the event that
            the date of the annual meeting is changed by more than 30
            days from such anniversary date, notice by the shareholder
            to be timely must be received no later than the
            close of business on the 10th day preceding the
            date of the meeting as announced in the notice of the
            meeting or otherwise publicly disclosed.  A shareholder's
            notice to the Secretary shall set forth as to each matter
            the shareholder proposes to bring before the meeting:  (i) a
            brief description of the proposal desired to be brought
            before the annual meeting and the reasons for conducting
            such business at the annual meeting, (ii) the name and
            address, as they appear on the Corporation's stock transfer
            records, of the shareholder proposing such business, and the
            name and address of the beneficial owner, if any, on whose

     *  Amended by Board resolution of 1/27/76.
    **  Added by Board resolution of 2/16/93.

            behalf the proposal is made, (iii) the class and number of
            shares of the Corporation which are owned beneficially and
            of record by such shareholder of record and by the
            beneficial owner, if any, on whose behalf the proposal is
            made, and (iv) any material interest of such shareholder of
            record and the beneficial owner, if any, on whose behalf the
            proposal is made in such business.

            (c)  The Board of Directors may reject any
            shareholder proposal submitted for consideration at the
            annual meeting which is not made in accordance with the
            terms of this By-Law or which is not a proper subject for
            shareholder action in accordance with provisions of
            applicable law.  Alternatively, if the Board of Directors
            fails to consider the validity of any shareholder proposal,
            the presiding officer of the meeting shall, if the facts
            warrant, determine and declare at the annual meeting that
            the shareholder proposal was not properly brought before the
            meeting and in accordance with the procedures prescribed by
            these By-Laws, and if he should make that determination, he
            shall so declare at the meeting and any such business or
            proposal shall not be acted upon.  Notwithstanding the
            foregoing provisions of this By-Law, a shareholder shall
            also comply with all applicable requirements of the
            Securities Exchange Act of 1934, as amended, and the rules
            and regulations thereunder with respect to the matters set
            forth in this By-Law.  This provision shall not prevent the
            consideration and approval or disapproval at the annual
            meeting of reports of officers, directors and committees of
            the Board of Directors, but, in connection with such
            reports, no new business shall be acted upon at the meeting
            unless stated, filed and recorded as herein provided.

      2.02.  Special Meeting.  Special meetings of the
      shareholders, for any purpose or purposes, unless otherwise
      prescribed by statute or by the Certificate of Incorporation, may
      be called by the Chairman of the Board of Directors, the
      President or the Board of Directors, or by the person designated
      in the written request of the holders of not less than a majority
      in amount of all shares of the Corporation entitled to vote at
      the meeting.  Such request shall state the purpose or purposes of
      the proposed meeting.  Business transacted at any special meeting
      of shareholders shall be limited to the purpose or purposes
      stated in the notice.

      2.03.  Place of Meeting.  The Board of Directors may
      designate any place, either within or without the State of
      Delaware, as the place of meeting for any annual meeting or for
      any special meeting called by the Board of Directors.  A waiver
      of notice signed by all shareholders entitled to vote at a
      meeting may designate any place, either within or without the
      State of Delaware, as the place for the holding of such meeting.
      If no designation is made, or if a special meeting be otherwise
      called, the place of meeting shall be the registered office of
      the Corporation, or such other suitable place in the county of
      such registered office as may be designated by the person calling
      such meeting, but any meeting may be adjourned to reconvene at
      any place designated by vote of a majority of the shares
      represented thereat.

      2.04.  Notice of Meeting.  Written notice stating the
      place, day and hour of the meeting and, in case of a special
      meeting, the purpose or purposes for which the meeting is called,
      shall be delivered not less than ten (unless a longer period is
      required by law) nor more than sixty days before the date of the
      meeting, either personally or by mail, by or at the direction of
      the President, or the Secretary, or other officer or persons
      calling the meeting, to each shareholder of record entitled to
      vote at such meeting.  If mailed, such notice shall be deemed to
      be delivered when deposited in the United States mail, addressed
      to the shareholder at his address as it appears on the stock
      record books of the Corporation, with postage thereon prepaid.

      2.05.  Closing of Transfer Books or Fixing of Record
      Date.  For the purpose of determining shareholders entitled to
      notice of or to vote at any meeting of shareholders or any
      adjournment thereof, or shareholders entitled to receive payment
      of any dividend, or in order to make a determination of
      shareholders for any other proper purpose, the Board of Directors
      may provide that the stock transfer books shall be closed for a
      stated period but not to exceed, in any case, sixty days.  If the
      stock transfer books shall be closed for the purpose of
      determining shareholders entitled to notice of or to vote at a
      meeting of shareholders, such books shall be closed for at least
      ten days immediately preceding such meeting.  In lieu of closing
      the stock transfer books, the Board of Directors may fix in
      advance a date as the record date for any such determination of
      shareholders, such date on which the particular action, requiring
      such determination of shareholders, is to be taken.  If the stock
      transfer books are not closed and no record date is fixed for the
      determination of shareholders entitled to notice of or to vote at
      a meeting of shareholders, or shareholders entitled to receive
      payment of a dividend, the close of business on the date on which
      the resolution of the Board of Directors declaring such dividend
      is adopted, as the case may be, shall be the record date for such
      determination of shareholders entitled to vote at any meeting of
      shareholders has been made as provided in this section, such
      determination shall be applied to any adjournment thereof except
      where the determination has been made through the closing of the
      stock transfer books and the stated period of closing has
      expired.

      2.06.  Voting Records.  The officer who has charge of the
      stock ledger of the Corporation shall prepare and make, at least
      ten days before every meeting of shareholders, a complete list of
      the shareholders entitled to vote at the meeting or any
      adjournment thereof, arranged in alphabetical order, and showing
      the address of each shareholder and the number of shares
      registered in the name of each shareholder.  Such list shall be
      open to the examination of any shareholder, for any purpose
      germane to the meeting, during ordinary business hours, for a
      period of at least ten days prior to the meeting, either at a
      place within the city where the meeting is to be held, which
      place shall be specified in the notice of the meeting, or, if not
      so specified, at the place where the meeting is to be held.  The
      list shall also be produced and kept at the time and place of the
      meeting during the whole time thereof, and may be inspected by
      any shareholder who is present.  Upon the willful neglect or
      refusal of the directors to produce such a list at any meeting
      for the election of directors they shall be ineligible for
      election to any office at such meetings.  In all other instances,
      failure to comply with the requirements of this section shall not
      affect the validity of any action taken at such meeting.

      2.07.  Quorum.  Except as otherwise provided in the
      Certificate of Incorporation, a majority of the shares entitled
      to vote, represented in person or by proxy, shall constitute a
      quorum at a meeting of shareholders.  If a quorum is present, the
      affirmative vote of the majority of the shares represented at the
      meeting and entitled to vote on the subject matter shall be the
      act of the shareholders unless the vote of a greater number or
      voting by classes is required by law or the Certificate of
      Incorporation.  Though less than a quorum of the outstanding
      shares are represented at a meeting, a majority of the shares so
      represented may adjourn the meeting from time to time without
      further notice.  At such adjourned meeting at which a quorum
      shall be present or represented, any business may be transacted
      which might have been transacted at the meeting as originally
      notified.  If the adjournment is for more than thirty days, or if
      after the adjournment a new record date is fixed for the
      adjourned meeting, a notice of the adjourned meeting shall be
      given to each shareholder of record entitled to vote at the
      meeting.

    * 2.08.  Conduct of Meeting.  The Chairman of the Board,
      and in his absence, the President, and in his absence, a Vice-
      President in the order provided under Section 4.07, and in their
      absence, any person chosen by the shareholders present shall call
      the meeting of the shareholders to order and shall act as
      chairman of the meeting, and the Secretary of the Corporation
      shall act as secretary of all meetings of the shareholders, but,
      in the absence of the Secretary, the presiding officer may
      appoint any other person to act as secretary of the meeting.
 
      2.09.  Proxies.  At all meetings of shareholders, a
      shareholder entitled to vote may vote in person or by proxy
      appointed in writing by the shareholder or by his duly authorized
      attorney in fact.  Such proxy shall be filed with the Secretary
      of the Corporation before or at the time of the meeting.  Unless
      otherwise provided in the proxy, a proxy may be revoked at any
      time before it is voted, either by written notice filed with the
      Secretary or the acting secretary of the meeting or by oral
      notice given by the shareholder to the presiding officer during
      the meeting.  The presence of a shareholder who has filed his
      proxy shall not of itself constitute a revocation.  No proxy
      shall be valid after three years from the date of its execution,
      unless otherwise provided in the proxy.  The Board of Directors
      shall have the power and authority to make rules establishing
      presumptions as to the validity and sufficiency of proxies.

      2.10.  Voting of Shares.  Each outstanding share shall be
      entitled to one vote upon each matter submitted to a vote at a
      meeting of shareholders, except to the extent that the voting
      rights of the shares of any class or classes are enlarged,
      limited or denied by the Certificate of Incorporation.

      2.11.  Voting of Shares by Certain Holders.

          (a)  Other Corporations.  Shares standing in the
          name of another corporation may be voted either in person or
          by proxy, by the president of such corporation or any other
          officer appointed by such president.  A proxy executed by
          any principal officer of such other corporation or assistant
          thereto shall be conclusive evidence of the signer's
          authority to act, in the absence of express notice to this
          Corporation, given in writing to the Secretary of this
          Corporation, of the designation of some other person by the
          board of directors or by the by-laws of such other
          corporation.

          (b)  Legal Representatives and Fiduciaries.
          Shares held by any administrator, executor, guardian,
          conservator, trustee in bankruptcy, receiver, or assignee
          for creditors may be voted by him, either in person or by
          proxy, without a transfer of such shares into his name
          provided that there is filed with the Secretary before or at
          the time of meeting proper evidence of his incumbency and
          the number of shares held.  Shares standing in the name of a
          fiduciary may be voted by him, either in person or by proxy.
          A proxy executed by a fiduciary, shall be conclusive
          evidence of the signer's authority to act, in the absence of
          express notice to this Corporation, given in writing to the
          Secretary of this Corporation, that such manner of voting is
          expressly prohibited or otherwise directed by the document
          creating the fiduciary relationship.

          (c)   Pledgees.   A shareholder whose shares are
          pledged shall be entitled to vote such shares, unless in the
          transfer by the pledgor on the books of the Corporation he
          has expressly empowered the pledgee to vote thereon, in
          which case only the pledgee, or his proxy, may represent
          such stock and vote thereon.

     *  Amended by Board resolution of 11/25/80.

          (d)  Treasury Stock and Subsidiaries.  Neither
          treasury shares, nor shares held by another corporation if a
          majority of the shares entitled to vote for the election of
          directors of such other corporation is held by this
          Corporation, shall be voted at any meeting or counted in
          determining the total number of outstanding shares entitled
          to vote, but shares of its own issue held by this
          Corporation in a fiduciary capacity, or held by such other
          corporation in a fiduciary capacity, may be voted and shall
          be counted in determining the total number of outstanding
          shares entitled to vote.

          (e)  Minors.  Shares held by a minor may be voted
          by such minor in person or by proxy and no such vote shall
          be subject to disaffirmance or avoidance, unless prior to
          such vote the Secretary of the Corporation has received
          written notice or has actual knowledge that shareholder is a
          minor.

          (f)  Incompetents and Spendthrifts.  Shares held
          by an incompetent or spendthrift may be voted by such
          incompetent or spendthrift in person or by proxy and no such
          vote shall be subject to a disaffirmance or avoidance,
          unless prior to such vote the Secretary of the Corporation
          has actual knowledge that such shareholder has been
          adjudicated an incompetent or spendthrift or actual
          knowledge of filing of judicial proceedings for appointment
          of a guardian.

          (g)  Joint Tenants.  Shares registered in the
          names of two or more individuals who are named in the
          registration as joint tenants may be voted in person or by
          proxy signed by any one or more of such individuals if
          either (i) no other such individual or his legal
          representative is present and claims the right to
          participate in the voting of such shares or prior to the
          vote files with the Secretary of the Corporation a contrary
          written voting authorization or direction or written denial
          of authority of the individual present or signing the proxy
          proposed to be voted or (ii) all such other individuals are
          deceased and the Secretary of the Corporation has no actual
          knowledge that the survivor has been adjudicated not to be
          the successor to the interests of those deceased.

      2.12.  Waiver of Notice by Shareholders.  Whenever any
      notice whatever is required to be given to any shareholder of the
      Corporation under the Certificate of Incorporation or By-Laws or
      any provision of law, a waiver thereof in writing, signed at any
      time, whether before or after the time of meeting, by the
      shareholder entitled to such notice, shall be deemed equivalent
      to the giving of such notice; provided that such waiver in
      respect to any matter of which notice is required under any
      provision of the Delaware Corporation Law, shall contain the same
      information as would have been required to be included in such
      notice, except the time and place of meeting.

      2.13.  Unanimous Consent Without Meeting.  Any action
      required or permitted by the Certificate of Incorporation or By-
      Laws or any provision of law to be taken at a meeting of the
      shareholders, may be taken without a meeting if a consent in
      writing, setting forth the action so taken, shall be signed by
      all of the shareholders entitled to vote with respect to the
      subject matter thereof.

                       ARTICLE III. BOARD OF DIRECTORS

    * 3.01.  General Powers, Number and Election.  The business
      and affairs of the Corporation shall be managed by its Board of
      Directors.  The number of directors of the Corporation shall be
      nine who shall be elected by the shareholders at the annual
      meeting of shareholders.

    * Amended by Board resolutions of 8/23/77, 2/24/81, 2/23/82, 2/19/85,
      11/25/85, 11/11/86, 8/12/87, 6/20/89, 2/18/92, 2/20/96 and 6/14/96.

      3.02.  Tenure and Qualifications.  Each director shall
      hold office until the next annual meeting of shareholders and
      until his successor shall have been elected, or until his prior
      death, resignation or removal.  A director may be removed from
      office by affirmative vote of a majority of the outstanding
      shares entitled to vote for the election of such director, taken
      at a meeting of shareholders called for that purpose.  A director
      may resign at any time by filing his written resignation with the
      Secretary of the Corporation.  Directors need not be residents of
      the State of Delaware or shareholders of the Corporation.
  
      3.03.  Regular Meetings.  A regular meeting of the Board
      of Directors shall be held without other notice than this By-Law
      immediately after the annual meeting of shareholders, and each
      adjourned session thereof.  The place of such regular meeting
      shall be the same as the place of the meeting of shareholders
      which precedes it, or such other suitable place as may be
      announced at such meeting of shareholders.  The Board of
      Directors may provide, by resolution, the time and place, either
      within or without the State of Delaware for the holding of
      additional regular meetings without other notice than such
      resolution.

      3.04.  Special Meetings.  Special meetings of the Board
      of Directors may be called by or at the request of the Chairman
      of the Board of Directors, President, Secretary or any two
      directors.  The Chairman of the Board of Directors, President or
      Secretary calling any special meeting of the Board of Directors
      called by them, and if no other place is fixed the place of
      meeting shall be the registered office of the Corporation in the
      State of Delaware.

      3.05.   Notice; Waiver.  Notice of each meeting of the Board of
      Directors (unless otherwise provided in or pursuant to Section 3.03)
      shall be given by written notice delivered personally or mailed or
      given by telegram to each director at his business address (or at
      such other address as such director shall have designated in writing
      filed with the Secretary), in each case not less than five days
      prior to the meeting.  If mailed, such notice shall be deemed to be
      delivered when deposited in the United States mail so addressed,
      with postage thereon prepaid.  If notice be given by telegram, such
      notice shall be deemed to be delivered when the telegram is
      delivered to the telegraph company.  Whenever any notice whatever is
      required to be given to any director of the Corporation under the
      Certificate of Incorporation or By-Laws or any provision of law, a
      waiver thereof in writing, signed at any time, whether before or
      after the time of meeting, by the director entitled to such notice,
      shall be deemed equivalent to the giving of such notice.  The
      attendance of a director at a meeting shall constitute a waiver of
      notice of such meeting, except where a director attends a meeting
      and objects thereat to the transaction of any business because the
      meeting is not lawfully called or convened.  Neither the business to
      be transacted at, nor the purpose of, any regular or special meeting
      of the Board of Directors need be specified in the notice or waiver
      of notice of such meeting.

      3.06.   Quorum.  Except as otherwise provided by law or by the
      Certificate of Incorporation or these By-Laws, a majority of the
      number of directors as provided in Section 3.01 shall constitute a
      quorum for the transaction of business at any meeting of the Board
      of Directors, but a majority of the directors present (though less
      than such quorum) may adjourn the meeting from time to time without
      further notice.

      3.07.   Manner of Acting.  The act of the majority of the directors
      present at a meeting at which a quorum is present shall be the act
      of the Board of Directors, unless the act of a greater number is
      required by law or by the Certificate of Incorporation or these By-
      Laws.

      3.08.   Conduct of Meetings.  The Chairman of the Board of
      Directors, and in his absence, the President, or in his absence, a
      Vice President, in the order provided under Section 4.07, and in
      their absence, any director chosen by the directors present, shall
      call meetings of the Board of Directors to order and shall act as
      chairman of the meeting.  The Secretary of the Corporation shall act
      as secretary of all meetings of the Board of Directors, but in the
      absence of the Secretary, the presiding officer may appoint any
      Assistant Secretary or any director or other person present to act
      as secretary of the meeting.
 
      3.09.   Vacancies.  Any vacancy occurring in the Board of Directors,
      including a vacancy created by an increase in the number of
      directors, may be filled until the next succeeding annual election
      by the affirmative vote of a majority of the directors then in
      office, though less than a quorum of the Board of Directors;
      provided, that in case of a vacancy created by the removal of a
      director by vote of the shareholders, the shareholders shall have
      the right to fill such vacancy at the same meeting or any
      adjournment thereof.

      3.10.   Compensation.  The Board of Directors, by affirmative vote
      of a majority of the directors then in office, and irrespective of
      any personal interest of any of its members, may establish
      reasonable compensation of all directors for services to the
      Corporation as directors, officers or otherwise, or may delegate
      such authority to an appropriate committee.

      3.11.   Presumption of Assent.  A director of the Corporation who is
      present at a meeting of the Board of Directors or a committee
      thereof of which he is a member at which action on any corporate
      matter is taken shall be presumed to have assented to the action
      taken unless his dissent shall be entered in the minutes of the
      meeting or unless he shall file his written dissent to such action
      with the person acting as the secretary of the meeting before the
      adjournment thereof or shall forward such dissent by registered mail
      to the Secretary of the Corporation immediately after the
      adjournment of the meeting.  Such right to dissent shall not apply
      to a director who voted in favor of such action.

      3.12.   Committees.  The Board of Directors by resolution adopted by
      the affirmative vote of a majority of the whole Board may designate
      one or more committees, each committee to consist of three or more
      directors elected by the Board of Directors, which to the extent
      provided in said resolution as initially adopted, and as thereafter
      supplemented or amended by further resolution adopted by a like
      vote, shall have and may exercise, when the Board of Directors is
      not in session, the management of the business and affairs of the
      Corporation, except that no such committee shall have the power or
      authority in reference to amending the Certificate of Incorporation,
      adopting an agreement of merger or consolidation, recommending to
      the shareholders a dissolution of the Corporation or a revocation of
      a dissolution, amending the By-Laws of the Corporation, declaring
      dividends to shareholders, authorizing the issuance of stock, or
      electing the principal officers or the filling of vacancies in the
      Board of Directors or committees created pursuant to this section.
      The Board of Directors may elect one or more of its members as
      alternate members of any such committee who may take the place of
      any absent member or members at any meeting of such committee, upon
      request by the President or upon request by the chairman of such
      meeting.  Each such committee shall fix its own rules governing the
      conduct of its activities and shall make such reports to the Board
      of Directors of its activities as the Board of Directors may
      request.

      3.13.   Unanimous Consent Without Meeting.  Any action required or
      permitted by the Certificate of Incorporation or By-Laws or any
      provision of law to be taken by the Board of Directors at a meeting
      or by resolution may be taken without a meeting if a consent in
      writing, setting forth the action so taken, shall be signed by all
      of the directors then in office.
 
    * 3.14.   Nomination By-Law.

            (a)  Only persons who are nominated in accordance with
            the procedures set forth in these By-Laws shall be eligible
            to serve as Directors.  Nominations of persons for election
            to the Board of Directors of the Corporation may be made at
            a meeting of shareholders (i) by or at the direction of the
            Board of Directors or (ii) by any shareholder of the
            Corporation who is a shareholder of record at the time of
            giving of notice provided for in this By-Law, who shall be
            entitled to vote for the election of directors at the
            meeting and who complies with the notice procedures set
            forth in this By-Law.

            (b)  Nominations by shareholders shall be made
            pursuant to timely notice in writing to the Secretary of the
            Corporation.  To be timely, a shareholder's notice shall be
            delivered to or mailed and received at the principal
            executive offices of the Corporation (i) in the case of an
            annual meeting, not less than 10 days prior to the first
            anniversary of the preceding year's annual meeting; provided,
            however, that in the event that the date of the annual
            meeting is changed by more than 30 days from such
            anniversary date, notice by the shareholder to be timely
            must be so received not later than the close of business on
            the 10th day preceding the date of the meeting as announced
            in the notice of the meeting or otherwise publicly
            disclosed, and (ii) in the case of a special meeting at
            which directors are to be elected, not later than the close
            of business on the 10th day preceding the date of the
            meeting as announced in the notice of the meeting or
            otherwise publicly disclosed.  Such shareholder's notice to
            the Secretary shall set forth (i) as to each person whom the
            shareholder proposes to nominate for election or reelection
            as a director all information relating to such person that
            is required to be disclosed in solicitations of proxies for
            election of directors, or is otherwise required, in each
            case pursuant to Regulation 14A under the Securities and
            Exchange Act of 1934, as amended (including such person's
            written consent to being named in the proxy statement as a
            nominee and to serving as a director if elected); (ii) as to
            the shareholder giving the notice (x) the name and address,
            as they appear on the Corporation's stock transfer records,
            of such shareholder, (y) the class and number of shares of
            the Corporation which are beneficially owned by such
            shareholder and also which are owned of record by such
            shareholder, and (z) a representation that such shareholder
            intends to appear in person or by proxy at the meeting to
            nominate the person or persons specified in the notice; and
            (iii) as to the beneficial owner, if any, on whose behalf
            the nomination is made, (x) the name and address of such
            person and (y) the class and number of shares of the
            Corporation which are beneficially owned by such person.
            The Corporation may require any proposed nominee to furnish
            any other information it may reasonably require to determine
            the eligibility of the proposed nominee to serve as a
            director of the Corporation.  At the request of the Board of
            Directors, any person nominated by the Board of Directors
            for election as a director shall furnish to the Secretary of
            the Corporation that information required to be set forth in
            a shareholder's notice of nomination which pertains to the
            nominee.

            (c)  Subject to the rights, if any, of holders of
            any class of capital stock of the Corporation (other than
            the common stock) then outstanding, no person shall be
            eligible to serve as a director of the Corporation unless
            nominated in accordance with the procedures set forth in
            this By-Law.  The presiding officer of the meeting shall, if
            the facts warrant, determine and declare at the meeting that
            a nomination was not made in accordance with the procedures
            prescribed by these By-Laws, and if he should make that

     *  Added by Board resolution of 2/16/93.

            determination, he shall so declare at the meeting and the
            defective nomination shall be disregarded.  Notwithstanding
            the foregoing provisions of this By-Law, a shareholder shall
            also comply with all applicable requirements of the
            Securities and Exchange Act of 1934, as amended, and the
            rules and regulations thereunder with respect to the matters
            set forth in this By-Law.

                            ARTICLE IV.  OFFICERS *

    ** 4.01.   Number.  The principal officers of the Corporation shall be a
       Chairman of the Board of Directors (who shall also serve as the Chief 
       Executive Officer), a President (who shall also serve as the Chief 
       Operating Officer), a Chief Financial Officer, one or more Vice 
       Presidents, a Secretary, a Treasurer and a Controller, each of whom 
       shall be elected by the Board of Directors.  Such other officers and 
       assistant officers as may be deemed necessary may be elected or 
       appointed by the Board of Directors.  Any two or more offices may be 
       held by the same person, except the offices of President and Secretary 
       and the offices of President and Vice President.  If required by the 
       Board of Directors, any one or more of the officers shall give a bond 
       for the faithful discharge of his or her duties in such sum and with 
       such surety or sureties as the Board of Directors shall determine.

       4.02.  Election and Term of Office.  The officers of the
       Corporation to be elected by the Board of Directors shall be elected
       annually by the Board of Directors at the first meeting of the Board
       of Directors held after each annual meeting of the shareholders.  If
       the election shall not be held at such meeting, such election shall
       be held as soon thereafter as is convenient.  Each officer shall
       hold office until his successor shall have been duly elected or
       until his prior death, resignation or removal.

       4.03.  Removal.  Any officer or agent may be removed by affirmative
       vote of majority of the whole Board of Directors whenever in its
       judgment the best interests of the Corporation will be served
       thereby, but such removal shall be without prejudice to the contract
       rights, if any, of the person so removed.  Election or appointment
       shall not of itself create contract rights.

       4.04.  Vacancies.  A vacancy in any principal office because of
       death, resignation, removal, disqualification or otherwise, shall be
       filled by the Board of Directors for the unexpired portion of the
       term.

   *** 4.05.  Chairman of the Board of Directors.  The Chairman of the
       Board of Directors shall be the Chief Executive Officer of the
       Corporation and, subject to the control of the Board of Directors,
       shall supervise and control the business, property and affairs of
       the Corporation.  The Chairman of the Board of Directors of the
       Corporation shall preside at all meetings of the Board of Directors
       and shareholders at which he is present.  He may sign and execute
       all instruments in the name of the Corporation which the Board of
       Directors has authorized to be executed, except where the execution
       thereof shall be expressly delegated by the Board of Directors or
       the By-Laws to another officer or agent of the Corporation, or shall
       be required by law to be otherwise executed.  The Chairman of the
       Board shall perform all duties incident to the office of Chief
       Executive Officer and shall be an ex-officio member of all standing
       committees.

   *** 4.06.  The President.  The President shall be the Chief Operating
       Officer of the Corporation and, subject to the control of the
       Board of Directors, shall direct the day-to-day operations of the
       Corporation's businesses and perform such duties as may be delegated

   *  Amended by Board resolution of 7/28/81, restated pursuant to Board action
      5/3/83 and amended by Board resolutions 11/8/94 and 3/6/95.
  **  Amended by Board resolution of 5/6/97.
 ***  Amended by Board resolutions of 1/27/76 and 11/25/80, restated pursuant to
      Board action of 5/3/83 and amended by Board resolution of 3/6/95.

      to him by the Chairman of the Board of Directors or the Board of
      Directors.  In the absence of the Chairman of the Board, or in the
      event of his death, inability or refusal to act, the President shall
      preside at the meetings of the Board of Directors and shareholders
      at which he is present.  He may sign and execute all instruments in
      the name of the Corporation which the Board of Directors
      has authorized to be executed, except where the execution thereof
      shall be expressly delegated by the Board of Directors or the By-
      Laws to another officer or agent of the Corporation, or shall be
      required by law to be otherwise executed.  The President shall
      perform all duties incident to the office of Chief Operating
      Officer and shall be an ex-officio member of all standing
      committees.

    * 4.07.  Chief Financial Officer.  The Chief Financial Officer shall, 
      subject to the control of the Board of Directors, (a) have primary 
      charge and custody of and be responsible for all funds and securities 
      of the Corporation; (b) be responsible for the accounting and financial 
      services of the Corporation; and (c) in general perform all of the 
      duties and exercise such other authority as from time to time may be 
      delegated or assigned to the Chief Financial Officer by the Chairman of 
      the Board, the President or by the Board of Directors.

   ** 4.08.  The Vice Presidents.  Subject to the provisions of
      Section 4.06, in the absence of the President or in the event of
      his death, inability or refusal to act, or in the event for any
      reason it shall be impractical for him to act personally, the
      Vice Presidents in the order designated by the Board of
      Directors, or in the absence of any designation, then in the
      order of their election, shall perform the duties of the
      President, and when so acting, shall have all the powers of and
      be subject to all the restrictions upon the President.  Any Vice
      President may sign, with the Secretary or Assistant Secretary,
      certificates for shares of the Corporation; and shall perform
      such other duties and have such authority as from time to time
      may be delegated or assigned to him by the President or the Board
      of Directors.  The execution of any instrument of the Corporation
      by any Vice President shall be conclusive evidence, as to third
      parties, of his authority to act in the stead of the President.

  *** 4.09.  The Secretary.  The Secretary shall:  (a) keep the
      minutes of the meetings of the shareholders and of the Board of
      Directors in one or more books provided for that purpose;  (b)
      see that all notices are duly given in accordance with the
      provisions of these By-Laws or as required by law; (c) be
      custodian of the corporate records and of the seal of the
      Corporation and see that the seal of the Corporation is affixed
      to all documents the execution of which on behalf of the
      Corporation under its seal is duly authorized;  (d) keep or
      arrange for the keeping of a register of the post office address
      of each shareholder which shall be furnished to the Secretary by
      such shareholder;  (e) sign with the Chairman of the Board or the
      President, or a Vice President, certificates for shares of the
      Corporation, the issuance of which shall have been authorized by
      resolution of the Board of Directors;  (f) have general charge of
      the stock transfer books of the Corporation; and (g) in general
      perform all duties and exercise such authority as from time to
      time may be delegated or assigned to him by the Chairman of the
      Board, or the President or by the Board of Directors.

 **** 4.10.  The Treasurer.  The Treasurer shall, under the general 
      supervision of the Chief Financial Officer, (a) have charge and custody
      of and be responsible for all funds and securities of the Corporation;
      (b) receive and give receipts for moneys due and payable to the 
      Corporation from any source whatsoever, and deposit all such moneys in

    * Amended by Board resolution of 5/6/97.
   ** Amended by Board resolution of 3/6/95.
  *** Amended by Board resolution 7/28/81, then restated pursuant to Board
      action of 5/3/83.
 **** Amended by Board resolution 11/8/94 and 5/6/97.

      the name of the Corporation in such banks, trust companies or other
      depositaries as shall be selected in accordance with the provisions
      of Section 5.04; and (c) in general perform all of the duties and
      exercise such other authority as from time to time may be delegated
      or assigned to the Tresurer by the Chief Financial Officer or by the 
      Board of Directors.

    * 4.11.  The Controller.  The Controller shall, under the general
      supervision of the Chief Financial Officer, (a) be in charge of the
      financial records of the Corporation; (b) be responsible for the
      accounting and financial services of the Corporation; and (c) in
      general perform all of the duties and exercise such other authority
      as from time to time may be delegated or assigned to the Controller
      by the Chief Financial Officer or by the Board of Directors.  The
      Controller shall at all reasonable times within business hours exhibit
      the Controller's books and accounts to any director.

   ** 4.12.  Assistant Secretaries and Assistant Treasurers.
      There shall be such number of Assistant Secretaries and Assistant
      Treasurers as the Board of Directors may from time to time
      authorize.  The Assistant Secretaries may sign with the Chairman
      of the Board, or the President or a Vice President certificates
      for shares of the Corporation the issuance of which shall have
      been authorized by a resolution of the Board of Directors.  The
      Assistant Treasurers shall respectively, if required by the Board
      of Directors, give bonds for faithful discharge of their duties
      in such sums and with such sureties as the Board of Directors
      shall determine.  The Assistant Secretaries and Assistant
      Treasurers, in general, shall perform such duties and have such
      authority as shall from time to time be delegated or assigned to
      them by the Secretary or the Treasurer, respectively, or by the
      Chairman of the Board or the President or the Board of Directors.

      4.13.  Other Assistants and Acting Officers.  The Board
      of Directors shall have the power to appoint any person to act as
      assistant to any officer, or agent for the Corporation in his
      stead, or to perform the duties of such officer whenever for any
      reason it is impracticable for such officer to act personally,
      and such assistant or acting officer or other agent so appointed
      by the Board of Directors shall have the power to perform all the
      duties of the office to which he is so appointed to be assistant,
      or as to which he is so appointed to act, except as such power
      may be otherwise defined or restricted by the Board of Directors.
 
      4.14.  Salaries.  The salaries of the principal officers
      shall be fixed from time to time by the Board of Directors or by
      a duly authorized committee thereof, and no officer shall be
      prevented from receiving such salary by reason of the fact that
      he is also a director of the Corporation.
  
             ARTICLE V.  CONTRACTS, LOANS, CHECKS AND DEPOSITS:
                             SPECIAL CORPORATE ACTS

      5.01.  Contracts.  The Board of Directors may authorize
      any officer or officers, agent or agents, to enter into any
      contract or execute or deliver any instrument in the name of and
      on behalf of the Corporation, and such authorization may be
      general or confined to specific instances.  In the absence of
      other designation, all deeds, mortgages and instruments of
      assignment or pledge made by the Corporation shall be executed in
      the name of the Corporation by the President or one of the Vice
      Presidents and by the Secretary, an Assistant Secretary, the

    * Amended by Board resolution 5/6/97.
   ** Amended by Board resolution of 7/28/81, then restated pursuant to 
      Board action of 5/3/83.

      Treasurer or an Assistant Treasurer; the Secretary or an
      Assistant Secretary, when necessary or required, shall affix the
      corporate seal thereto; and when so executed no other party to
      such instrument or any third party shall be required to make any
      inquiry into the authority of the signing officer or officers.

      5.02.  Loans.  No indebtedness for borrowed money shall
      be contracted on behalf of the Corporation and no evidences of
      such indebtedness shall be issued in its name unless authorized
      by or under the authority of a resolution of the Board of
      Directors.  Such authorization may be general or confined to
      specific instances.

      5.03.  Checks, Drafts, etc.  All checks, drafts, or other
      orders for the payment of money, notes or other evidences of
      indebtedness issued in the name of the Corporation, shall be
      signed by such officer or officers, agent or agents of the
      Corporation and in such manner as shall from time to time be
      determined by or under the authority of a resolution of the Board
      of Directors.

      5.04.  Deposits.  All funds of the Corporation not
      otherwise employed shall be deposited from time to time to the
      credit of the Corporation in such banks, trust companies or other
      depositaries as may be selected by or under the authority of a
      resolution of the Board of Directors.

      5.05.  Voting of Securities Owned by This Corporation.
      Subject always to the specific directions of the Board of
      Directors, (a) any shares or other securities issued by any other
      corporation and owned or controlled by this Corporation may be
      voted at any meeting of security holders of such other
      corporation by the President of this Corporation if he be
      present, or in his absence by any Vice President of this
      Corporation who may be present, and (b) whenever in the judgment
      of the President, or in his absence, of any Vice President, it is
      desirable for this Corporation to execute a proxy or written
      consent in respect to any shares or other securities issued by
      any other corporation and owned by this Corporation, such proxy
      or consent shall be executed in the name of this Corporation by
      the President or one of the Vice Presidents of this Corporation,
      without necessity of any authorization by the Board of Directors,
      affixation of corporate seal or counter signature or attestation
      by another officer.  Any person or persons designated in the
      manner above stated as the proxy or proxies of this Corporation
      shall have full right, power and authority to vote the shares or
      other securities issued by such other corporation and owned by
      this Corporation and the same as such shares or other securities
      might be voted by this Corporation.

               ARTICLE VI.  CERTIFICATES FOR SHARES AND THEIR TRANSFER

    * 6.01.  Certificates for Shares.  Certificates
      representing shares of the Corporation shall be in such form,
      consistent with law, as shall be determined by the Board of
      Directors.  Such certificates shall be signed by the Chairman of
      the Board, or the President or a Vice President and by the
      Secretary or an Assistant Secretary.  All certificates for shares
      shall be consecutively numbered or otherwise identified.  The
      name and address of the person to whom the shares represented
      thereby are issued, with the number of shares and date of issue,
      shall be entered on the stock transfer books of the Corporation.
      All certificates surrendered to the Corporation for transfer
      shall be canceled and no new certificate shall be issued until
      the former certificate for a like number of shares shall have
      been surrendered and canceled, except as provided in Section
      6.06.

    * 6.02.  Facsimile Signatures and Seal.  The seal of the
      Corporation on any certificate for shares may be a facsimile.
      The signature of the Chairman of the Board or the President or
      Vice President and the Secretary or Assistant Secretary upon a

    * Amended by Board resolution of 7/28/81.

      certificate may be facsimiles if the certificate is manually
      signed on behalf of a transfer agent, or a registrar, other than
      the Corporation itself or an employee of the Corporation.

      6.03.  Signature by Former Officers.  In case any
      officer, who has signed or whose facsimile signature has been
      placed upon any certificate for shares, shall have ceased to be
      such officer before such certificate is issued, it may be issued
      by the Corporation with the same effect as if he were such
      officer at the date of issue.

      6.04.  Transfer of Shares.  Prior to due presentment of a
      certificate for shares for registration of transfer the
      Corporation may treat the registered owner of such shares as the
      person exclusively entitled to vote, to receive notifications and
      otherwise to have and exercise all the rights and power of an
      owner.  Where a certificate for shares is presented to the
      Corporation with a request to register for transfer, the
      Corporation shall not be liable to the owner or any other person
      suffering loss as a result of such registration of transfer if
      (a) there were on or with the certificate the necessary
      endorsements, and (b) the Corporation had no duty to inquire into
      adverse claims or had discharged any such duty.  The Corporation
      may require reasonable assurance that said endorsements are
      genuine and effective and compliance with such other regulations
      as may be prescribed by or under the authority of the Board of
      Directors.

      6.05.  Restrictions on Transfer.  The face or reverse
      side of each certificate representing shares shall bear a
      conspicuous notation of any restriction imposed by the
      Corporation upon the transfer of such shares.
 
    * 6.06.  Lost, Destroyed or Stolen Certificates.  Where the
      owner claims that his certificate for shares has been lost,
      destroyed or wrongfully taken, a new certificate may be issued in
      place thereof if the owner so requests before the Corporation has
      notice that such shares have been acquired by a bona fide
      purchaser.  When authorizing such issuance of a new certificate
      the President, Vice President or Secretary of the Corporation
      shall require the owner of such lost, destroyed or wrongfully
      taken certificate to file with the Corporation sufficient
      indemnity bond, and satisfy such other reasonable requirements as
      may be prescribed by or under the authority of the Board of
      Directors.

      6.07.  Consideration for Shares.  The shares of the
      Corporation may be issued for such consideration as shall be
      fixed from time to time by the Board of Directors, provided that
      any shares having a par value shall not be issued for a
      consideration less than the par value thereof.  The consideration
      to be paid for shares may be paid in whole or in part, in money,
      in other property, tangible or intangible, or in labor or
      services actually performed for the Corporation.  When payment of
      the consideration for which shares are to be issued shall have
      been received by the Corporation, such shares shall be deemed to
      be fully paid and nonassessable by the Corporation.  No
      certificate shall be issued for any share until such share is
      fully paid.

      6.08.  Stock Regulations.  The Board of Directors shall
      have the power and authority to make all such further rules and
      regulations not inconsistent with the statutes of the State of
      Delaware as it may deem expedient concerning the issue, transfer
      and registration of certificates representing shares of the
      Corporation.

                           ARTICLE VII.  INDEMNIFICATION

      7.01.  Mandatory Indemnification.  The Corporation shall,
      to the full extent permitted by the Delaware Corporation Law,
      indemnify any person who was or is a party or threatened to be
      made a party to any threatened, pending or completed action, suit
   
    * Amended by Board resolution of 2/18/86.

      or proceeding, whether civil, criminal, administrative or
      investigative, by reason of the fact that he is or was a director
      or officer of the Corporation  or is or was serving at the
      request of the Corporation as a director or officer of any other
      corporation or enterprise.  Such right of indemnification shall
      inure to the benefit of the heirs, executors, administrators and
      personal representatives of such a person.

      7.02.  Permissive Supplementary Benefits.  The
      Corporation may, but shall not be required to, supplement the
      right of indemnification under Section 7.01 by (a) the purchase
      of insurance on behalf of any one or more of such persons,
      whether or not the Corporation would be obligated to indemnify
      such person Section 7.01, (b) individual or group indemnification
      agreements with any one or more of such persons and c advances
      for related expenses of such a person.

      7.03.  Amendment.  This Article VII may be amended or
      repealed only by a vote of the shareholders and not by a vote of
      the Board of Directors.
  

                           ARTICLE IX.  AMENDMENTS

      9.01.  By Shareholders.  These By-Laws may be altered,
      amended or appealed and new by-laws may be adopted by the
      shareholders by affirmative vote of not less than a majority of
      the shares present or represented at any annual or special
      meeting of the shareholders at which a quorum is in attendance.

      9.02.  By Directors.  These By-Laws may also be altered,
      amended or repealed and new by-laws may be adopted by the Board
      of Directors by affirmative vote of a majority of the number of
      directors present at any meeting at which a quorum is in
      attendance; but no by-laws adopted by the shareholders shall be
      amended or repealed by the Board of Directors if the by-law so
      adopted so provides.

      9.03.  Implied Amendments.  Any action taken or authorized by the
      shareholders or by the Board of Directors, which would be inconsistent
      with the By-Laws then in effect but is taken or authorized by
      affirmative vote of not less than the number of shares or the number
      of directors required to amend the By-Laws so that the By-Laws would
      be consistent with such action, shall be given the same effect as
      though the By-Laws had been temporarily amended or suspended so far,
      but only so far, as is necessary to permit the specific action so
      taken or authorized.

                                                                 Exhibit 21

                         SIGMA-ALDRICH CORPORATION
                          PRINCIPAL SUBSIDIARIES
                          ----------------------

Sigma-Aldrich Corporation (Delaware), the Registrant:

   1.  Sigma-Aldrich Co. (Illinois)

      (A)  Sigma Chemical Company (Missouri)
           (1)  Sigma Israel Chemicals, Ltd. (Israel)
           (2)  Sigma-Aldrich Chemie Holding GmbH (Germany)
                (a)  Sigma-Aldrich Chemie GmbH (Germany)
                (b)  RdH Laborchemikalien GmbH & Co. (Germany)
      (B)  Aldrich Chemical Company, Inc. (Delaware)
           (1)  Sigma-Aldrich N.V./S.A. (Belgium)
           (2)  Sigma Chemie B.V. (The Netherlands)
           (3)  Aldrich-Chemie GmbH & Co. K.G. (Germany)
           (4)  Aldrich-Chemie Verwaltungs GmbH (Germany)
           (5)  Sigma-Aldrich S.r.l. (Italy)
           (6)  Sigma-Aldrich Chimie S.N.C. (France)
                (a)  Sigma-Aldrich Chemie S.a.r.l. (France)
     (C)  Supelco, Inc. (Delaware)
        
   2.  B-Line Systems, Inc. (Illinois)

   3.  Sigma-Aldrich Foreign Sales Corporation (Barbados)

   4.  Fluka Chemie AG (Switzerland)

   5.  Sigma-Aldrich Company, Ltd. (United Kingdom)

   6.  Sigma-Aldrich Foreign Holding Co. (Missouri)
      (A)  Sigma-Aldrich Quimica S.A. (Spain)
      (B)  Sigma-Aldrich Pty., Limited (Australia)
      (C)  Sigma-Aldrich Canada Ltd. (Canada)
      (D)  Sigma-Aldrich s.r.o. (Czech Republic)
      (E)  Sigma-Aldrich Quimica Brasil Ltda. (Brazil)
      (F)  Sigma-Aldrich Quimica S.A. de C.V. (Mexico)
      (G)  Sigma-Aldrich Handels GmbH (Austria)
      (H)  Sigma-Aldrich Kft (Hungary)
      (I)  Sigma-Aldrich Sp. zo.o (Poland)
      (J)  Sigma-Aldrich Japan KK (Japan)
      (K)  Sigma-Aldrich India (India)
      (L)  Sigma-Aldrich Ireland Ltd. (Ireland)
      (M)  Sigma-Aldrich E.P.E. (Greece)
      (N)  Sigma-Aldrich de Argentina, S.A. (Argentina)
      (O)  Sigma-Aldrich (Pty.) Ltd. (South Africa)
      (P)  Sigma-Aldrich Pte. Ltd. (Singapore)
      (Q)  Sigma-Aldrich Korea Ltd. (Korea)
      (R)  LabKemi AB (Sweden)
      (S)  Ing F. Heidenreich AS (Norway)



(Page 12 of the 1997 Annual Report to Shareholders)

                    SELECTED FINANCIAL DATA (UNAUDITED)
                    -----------------------------------
<TABLE>
<CAPTION>
COMMON STOCK DATA: (per share)
- --------------------------------------------------------------------------------
                    1997 Price Range     1996 Price Range           Dividends
                     High       Low       High        Low        1997      1996
- --------------------------------------------------------------------------------
<S>                <C>       <C>        <C>        <C>         <C>       <C> 
First Quarter       $33       $28-7/8    $30-1/8    $24-5/8    $.0625    $.0550
Second Quarter       36        26-7/8     30         25-1/8     .0625     .0550
Third Quarter        35-3/4    31-3/8     28-3/4     23-3/4     .0625     .0550
Fourth Quarter       41-1/8    31-3/4     32-1/16    28         .0700     .0625
</TABLE>

The common stock is traded on the National Market System ("NMS")
of the National Association of Securities Dealers Automated
Quotation System ("NASDAQ"). The trading symbol is SIAL. Options
in the Company's common stock are traded on the Chicago Board
Options Exchange.

<TABLE>
<CAPTION>
ANNUAL FINANCIAL DATA: (in millions, except per share data)
- -----------------------------------------------------------------------------------------
                                          1997       1996       1995       1994     1993
- -----------------------------------------------------------------------------------------
<S>                                    <C>         <C>         <C>       <C>       <C>       
Net sales                              $1,127.1    $1,034.6    $959.8    $851.2    $739.4
Income before cumulative effect of 
accounting changes                        166.1       147.9     131.7     110.3     107.1
Net income                                166.1       147.9     131.7     110.3      96.3
Per share:
  Income before cumulative effect of 
  accounting changes                       1.66        1.48      1.32      1.11      1.08
  Net income - Basic                       1.66        1.48      1.32      1.11       .97
  Net income - Diluted                     1.62        1.45      1.30      1.09       .96
  Dividends                               .2575       .2275     .1900     .1688     .1500
Total assets                            1,243.8     1,100.0     985.2     852.0     753.4
Long-term debt                               .6         3.8      13.8      14.5      17.3
</TABLE>

<TABLE>
<CAPTION>
QUARTERLY FINANCIAL DATA: (in millions, except per share data)
- -----------------------------------------------------------------------------------------
                                                     1997 Quarter Ended
                                      March 31      June 30     Sept. 30     Dec. 31
- -----------------------------------------------------------------------------------------
<S>                                   <C>          <C>          <C>         <C>  
Net sales                               $279.1       $278.6       $286.0      $283.4
Gross profit                             150.5        151.7        151.4       154.8
Net income                                41.4         40.7         41.8        42.2
Net income per share - Basic               .41          .41          .42         .42
Net income per share - Diluted             .40          .40          .41         .41


                                                     1996 Quarter Ended
                                      March 31      June 30     Sept. 30     Dec. 31
- -----------------------------------------------------------------------------------------
Net sales                               $262.4       $258.8       $255.8      $257.6
Gross profit                             141.4        138.2        137.2       141.6
Net income                                36.7         37.0         37.0        37.2
Net income per share - Basic               .37          .37          .37         .37
Net income per share - Diluted             .36          .36          .36         .37
</TABLE>

(Pages 13-14 of the 1997 Annual Report to Shareholders)

                    MANAGEMENT'S DISCUSSION OF FINANCIAL
                    CONDITION AND RESULTS OF OPERATIONS


                         RESULTS OF OPERATIONS

 During the three years ended December 31, 1997, the Company's
sales and earnings continued to grow.

 Chemical sales increased 8.3%, 7.4%, and 13.0% for 1997, 1996 and
1995, respectively. This sales growth is attributed to selective
price increases, the annual addition of new products, selected
acquisitions, including Riedel-de Haen, and the opening of new
international sales offices. Price increases for products listed
in the general chemical catalogs averaged 3.5% in 1997 and 4.5% in
1996 and 1995. New product sales, while not material in the year
introduced, contribute to sales growth in subsequent years.
Acquisitions contributed 3% to the 1997 sales increase. The effect
of translating foreign currency sales into the U.S. dollar reduced
the 1997 and 1996 sales growth by 4.4% and 1.3%, respectively, and
contributed 3.5% of the 1995 sales growth. Chemical sales for 1997
and 1996 also benefited from aggressive marketing and closer
customer contacts, partially offsetting the effect of reduced
growth in research funding in all major markets. Emphasis on
international markets and new sales offices, together with the
addition of Riedel-de Haen products, helped achieve growth in
international direct sales of 30.6% in 1997, 14% in 1996 and 18%
in 1995, after eliminating the effect of changes in currency
exchange rates. The increase in direct international sales is
partially offset by a slowing in export sales from the United
States. Export sales declined 22.0% and 1% in 1997 and 1996,
respectively, after increasing 2% in 1995, reflecting the
continued transfer of sales to both our existing and new
international offices, together with the impact of the stronger
U.S. dollar in 1997 and 1996.

 Metal sales increased 11.8%, 9.6%, and 11.6% for 1997, 1996 and
1995, respectively. Average selling prices decreased 2.2% and 2.0%
in 1997 and 1996, respectively, after increasing 6% in 1995. These
price changes are due to competitive markets in 1997 and changes
in raw material costs in 1996 and 1995. Excluding the effect of
price changes in the two most recent years, the growth in 1997
came mainly from telecommunications and electronic enclosures
markets, with additional growth spread across other product lines.
The growth in 1996 was due in part to the addition of electronic
enclosures to the product line. Slower growth in 1995 resulted
from slower construction demand.

 Cost of products sold was 46.0% in 1997 and 1996, respectively,
and 46.7% in 1995. The improvement is due to increased utilization
of new facilities, productivity gains, a higher proportion of
sales of manufactured chemical products and product mix changes.
Price decreases for metal products in 1997 and 1996 partially
offset the positive effect of the improvements. The cost of
chemical products sold increased by 7.9% and the cost of metal
products sold increased by 12.4% in 1997, compared to sales
increases of 8.3% and 11.8%, respectively.

 Selling, general and administrative expenses were 31.6%, 31.8%,
and 32.1% of sales in 1997, 1996, and 1995, respectively. The
decrease in 1997 and 1996 reflects ongoing efforts to effectively
manage staffing levels and control other significant operating
expenses. In 1997 and 1996, net interest income contributed $4.8
million and $5.2 million, respectively, to pretax earnings,
reflecting similar average cash balances. Net interest costs in
1995 were $1.1 million caused by higher levels of long term debt
and notes payable.

 Management expects future sales growth from the continuing
introduction of new products, more effective distribution of
catalogs, added promotion and marketing programs and the
continuing expansion of a sales and marketing unit to actively
promote sales of research chemicals. Additionally, 1998 sales will
benefit from new sales offices and businesses added during 1997.

                         
                          LIQUIDITY AND
                        CAPITAL RESOURCES

 In 1997, cash and temporary cash investments decreased $57.5
million while short-term borrowings increased by $4.1 million. At
December 31, 1997, there were no borrowings outstanding under the
Company's credit arrangements, which provide for borrowing up to
$100 million. In 1996, cash and temporary cash investments
increased by $19.7 million while short-term borrowings were
reduced by $4.7 million.

 Cash provided by operating activities was $132.1 million in 1997,
a decrease of $21.3 million from 1996. The change resulted mainly
from a $18.2 million increase in net income in 1997 offset by an
increase in accounts receivable and inventories of $93.5 million
in 1997 compared to $42.1 million in 1996. The increase in
receivables is due primarily to the increase in international
chemical sales and a higher percentage of metal sales to customers
stocking these products that receive extended terms. Inventory
grew at a rate faster than sales as the result of acquisitions,
further deployment of inventory to new locations and to a lesser
extent, to established locations, to improve service levels. Cash
generated by operations and available from credit facilities
continues to provide sufficient liquidity for present and future
operating and capital needs.

 Cash currently available and expected to be generated in 1998 will
be invested on a temporary basis. Longer term, excess funds are
expected to be reinvested in the business to expand production and
distribution capacity. Also, depending on opportunities and market
conditions, funds may be used to acquire new businesses, as well
as other possible uses. These investments should enable the
Company to continue to grow sales and profits.

 During 1997, a total of $108.7 million was invested, with
significant expenditures made in support of distribution and
production expansions in the U.S., UK, Israel and Switzerland, and
for new computer software, hardware and implementation support
relating to SAP. In 1997, the Company began modifying its computer
system programming to process transactions in the year 2000.
Anticipated spending for this modification will be expensed as
incurred and is not expected to have a significant impact on the
Company's ongoing results of operations.

 During 1998, we expect capital investments of between $110 to $130
million to continue to enhance distribution, warehousing,
production and computer systems, both domestically and
internationally. Projects for increased distribution capacity
should be completed in the U.S. and Germany during 1998. The
Company has not made any other significant commitments for, or
acquisitions of, capital facilities early in 1998.

 The preceding discussion should be read in conjunction with the
consolidated financial statements and notes thereto. Except for
historical information, the statements in this discussion may
constitute forward looking statements within the meaning of
Section 27A of the Securities Act of 1933 and Section 21E of the
Securities Exchange Act of 1934 that involve risk and uncertainty,
including financial, business environment and projections.
Although the Company believes its expectations are based on
reasonable assumptions, it can give no assurance that its goals
will be achieved. The important factors that could cause actual
results to differ materially from those in the forward looking
statements herein include, without limitation, reduced growth in
research funding, uncertainties surrounding possible government
health care reform, government regulation applicable to the
Company's business, the highly competitive environment in which
the Company competes and the impact of fluctuations in foreign
currency exchange rates.

(Five bar graphs appear on pages 13-14 depicting the following data)
<TABLE>
                                             1997     1996     1995   
                                            ------   ------   ------
<S>                                         <C>      <C>      <C>
Chemical Sales (millions of dollars)        $901.7   $832.9   $775.8

Metal Sales (millions of dollars)            225.4    201.7    184.0

Cost of Products Sold (percent of sales)     46.0%    46.0%    46.7%

Selling, General and Administrative      
   Expenses (percent of sales)               31.6%    31.8%    32.1% 

Capital Expenditures (millions of dollars)   108.7     93.9     60.2
</TABLE>

(Page 15 of the 1997 Annual Report to Shareholders)

                    EXCHANGE RATE SENSITIVITY

 The Company uses forward exchange contracts to hedge certain
receivables and payables denominated in foreign currencies. Most
of the contracts are single currency. Gains and losses on hedges
of existing assets and liabilities based on the difference in the
contract rate and the spot rate at the end of each month for all
contracts still in force are typically offset by transaction gains
and losses, with net gains and losses included in selling,
general, and administrative expenses. While contract terminations
are infrequent, gains and losses on terminations are recognized in
the month of execution in the same manner.

 The table below provides information about the Company's
derivative financial instruments and related balance sheet items
by currency and presents such information in U.S. dollar
equivalents. The table summarizes information on the derivative
instruments and related underlying transactions that are sensitive
to foreign currency exchange rates, including foreign currency
forward exchange contracts and receivables and payables in other
than a unit's local currency. The net amount that is exposed to
changes in foreign currency rates is then subjected to a 10%
appreciation and depreciation in the value of the foreign currency
versus the U.S. dollar. The Company has no material sensitivity to
changes in foreign currency rates on its net exposed derivative
financial instrument position.
<TABLE>
<CAPTION>       
                                  December 31, 1997
                               (UNAUDITED, IN MILLIONS)
- ----------------------------------------------------------------------------------------------------------
                                                                         Foreign            Foreign
                 U.S. Dollar     Net Underlying     Net Exposed      Exchange Impact    Exchange Impact
                Value of Net    Foreign Currency    Long/(Short)        From 10%            From 10%
              Foreign Exchange     Transaction        Currency        Appreciation of    Depreciation of
                  Contracts         Exposure          Position          U.S. Dollar        U.S. Dollar
- ----------------------------------------------------------------------------------------------------------
<S>               <C>               <C>               <C>               <C>                 <C>                 
German Mark        $ 45.3            $ 50.3            $ 5.0             $ (.50)             $ .50
British Pound        26.1              25.9             (0.2)               .02               (.02)
Swiss Franc         (31.0)            (29.2)             1.8               (.18)               .18
French Franc         26.5              28.2              1.7               (.17)               .17
Japanese Yen         14.2              15.2              1.0               (.10)               .10
Canadian Dollar      11.9              13.9              2.0               (.20)               .20
Italian Lira          7.9               8.7              0.8               (.08)               .08
Others               12.3              12.9              0.6               (.06)               .06
- ----------------------------------------------------------------------------------------------------------
Total              $113.2            $125.9            $12.7             $(1.27)             $1.27
- ----------------------------------------------------------------------------------------------------------
</TABLE>

(Page 16 of the 1997 Annual Report to Shareholders)
<TABLE>
<CAPTION>
                                        CONSOLIDATED STATEMENTS OF INCOME
                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

                                                                Years Ended December 31,
                                                        1997             1996           1995
- ----------------------------------------------------------------------------------------------------------
<S>                                                 <C>             <C>              <C>                       
Net sales                                           $1,127,084       $1,034,565       $959,822
  Cost of products sold                                518,711          476,120        447,898
- ----------------------------------------------------------------------------------------------------------
Gross profit                                           608,373          558,445        511,924
  Selling, general and administrative expenses         355,619          328,761        307,764
- ----------------------------------------------------------------------------------------------------------
Income before provision for income taxes               252,754          229,684        204,160
  Provision for income taxes                            86,695           81,828         72,477
- ----------------------------------------------------------------------------------------------------------
Net income                                          $  166,059       $  147,856       $131,683
- ----------------------------------------------------------------------------------------------------------
Weighted average number of shares outstanding          100,210           99,930         99,714
Net income per share - Basic                             $1.66            $1.48          $1.32
Net income per share - Diluted                           $1.62            $1.45          $1.30

The accompanying notes are an integral part of these statements.
</TABLE>

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To Sigma-Aldrich Corporation:

We have audited the accompanying consolidated balance sheets of
Sigma-Aldrich Corporation (a Delaware Corporation) and
subsidiaries (the "Company") as of December 31, 1997 and 1996, and
the related consolidated statements of income, stockholders'
equity and cash flows for each of the three years in the period
ended December 31, 1997. 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 in accordance with generally accepted
auditing standards. Those standards require that we plan and
perform the audits 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. An audit also
includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits
provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Sigma-
Aldrich Corporation and subsidiaries as of December 31, 1997 and
1996, and the results of their operations and their cash flows for
each of the three years in the period ended December 31, 1997, in
conformity with generally accepted accounting principles.


ARTHUR ANDERSEN LLP
St. Louis, Missouri
February 17, 1998

(Page 17 of the 1997 Annual Report to Shareholders)
<TABLE>
<CAPTION>
                                 CONSOLIDATED BALANCE SHEETS
                                       (IN THOUSANDS)
                                                                    December 31,
                                                               1997            1996
- ------------------------------------------------------------------------------------
<S>                                                        <C>           <C>  
ASSETS
Current assets:
  Cash and temporary cash investments                       $  46,228      $ 103,685
  Accounts receivable, less allowance for doubtful accounts
   of $6,531 and $7,338, respectively                         186,847        165,511
  Inventories                                                 420,809        362,784
  Other current assets                                         52,790         34,657
- ------------------------------------------------------------------------------------
   Total current assets                                       706,674        666,637
- ------------------------------------------------------------------------------------
Property, plant and equipment:
  Land                                                         31,594         32,276
  Buildings and improvements                                  252,388        233,684
  Machinery and equipment                                     381,771        338,531
  Construction in progress                                     90,831         54,927
  Less - Accumulated depreciation                            (317,706)      (280,323)
- -------------------------------------------------------------------------------------
   Net property, plant and equipment                          438,878        379,095
- -------------------------------------------------------------------------------------
Other assets                                                   98,270         54,226
- -------------------------------------------------------------------------------------
   Total assets                                            $1,243,822     $1,099,958
- -------------------------------------------------------------------------------------

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Notes payable                                            $    6,751     $    2,615
  Current maturities of long-term debt                            649          9,454
  Accounts payable                                             53,257         60,881
  Accrued payroll and payroll taxes                            13,453         11,571
  Other accrued expenses                                       28,816         16,689
  Accrued income taxes                                         16,553          9,107
- -------------------------------------------------------------------------------------
   Total current liabilities                                  119,479        110,317
Long-term debt                                                    552          3,787
Deferred postretirement benefits                               35,475         32,918
Deferred compensation                                          12,766         10,662
Other liabilities                                              15,216             --
- -------------------------------------------------------------------------------------
   Total liabilities                                          183,488        157,684
- -------------------------------------------------------------------------------------

Stockholders' equity:
  Common stock                                                100,377        100,044
  Capital in excess of par value                               24,168         17,002
  Retained earnings                                           959,717        819,467
  Cumulative translation adjustments                          (23,928)         5,761
- -------------------------------------------------------------------------------------
   Total stockholders' equity                               1,060,334        942,274
- -------------------------------------------------------------------------------------
   Total liabilities and stockholders' equity              $1,243,822     $1,099,958
- -------------------------------------------------------------------------------------
The accompanying notes are an integral part of these balance sheets.
</TABLE>

(Page 18 of the 1997 Annual Report to Shareholders)
<TABLE>
<CAPTION>
             CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
                 (IN THOUSANDS, EXCEPT PER SHARE DATA)

                                        Common Stock
                                 200,000 Shares Authorized   Capital in                    Cumulative
                                        ($1.00 Par)           Excess of      Retained      Translation
                                   Shares          Amount     Par Value      Earnings      Adjustments
- -------------------------------------------------------------------------------------------------------
<S>                               <C>            <C>          <C>            <C>          <C>     
Balance, December 31, 1994         49,832        $ 49,832      $10,004       $631,634       $    8,035
  Net income                          --              --           --         131,683              --
  Dividends ($.38 per share)          --              --           --         (18,947)             --
  Awards under deferred
   compensation plan                   18              18          564            --               --
  Exercise of stock options            27              27          887            --               --
  Translation adjustment              --              --           --             --            10,997
- -------------------------------------------------------------------------------------------------------
Balance, December 31, 1995         49,877          49,877       11,455        744,370           19,032   
  Net income                          --              --           --         147,856              --
  Dividends ($.2275 per share)        --              --           --         (22,738)             --
  Awards under deferred
   compensation plan                    8               8          384            --               --
  Exercise of stock options           138             138        5,163            --               --
  Stock split (2 for 1)            50,021          50,021          --         (50,021)             --
  Translation adjustment              --              --           --             --           (13,271)
- -------------------------------------------------------------------------------------------------------
Balance, December 31, 1996        100,044         100,044       17,002        819,467            5,761
  Net income                          --              --           --         166,059              --
  Dividends ($.2575 per share)        --              --           --         (25,809)             --
  Awards under deferred
   compensation plan                   23              23          682            --               --
  Exercise of stock options           310             310        6,484            --               --
  Translation adjustment              --              --           --             --           (29,689)
- -------------------------------------------------------------------------------------------------------
Balance, December 31, 1997        100,377        $100,377      $24,168       $959,717         $(23,928)
- -------------------------------------------------------------------------------------------------------

Share and per share information prior to the December 1996 stock
split have not been restated.
The accompanying notes are an integral part of this statement.
</TABLE>

(Page 19 of the 1997 Annual Report to Shareholders)
<TABLE>
<CAPTION>
                          CONSOLIDATED STATEMENTS OF CASH FLOWS
                                      (IN THOUSANDS)

                                                                      Years Ended December 31,
                                                                   1997       1996         1995
- --------------------------------------------------------------------------------------------------
<S>                                                            <C>         <C>          <C>                
Cash flows from operating activities:
  Net income                                                    $166,059    $147,856     $131,683
  Adjustments to reconcile net income to net cash
   provided by operating activities:
    Depreciation and amortization                                 48,053      45,213       40,872
    Deferred income taxes                                          4,994       1,918        1,037
    Postretirement benefits expense                                3,792       3,739        3,584
    Deferred compensation expense                                  3,437       2,762        4,111
    Deferred compensation payments                                  (628)       (407)        (526)
    Increase in accounts receivable                              (30,077)    (22,726)      (8,910)
    Increase in inventories                                      (63,390)    (19,361)     (13,328)
    Increase in other current assets                             (18,513)     (1,297)      (7,384)
    Increase (decrease) in accounts payable                       (7,534)      2,847        1,182
    Increase (decrease) in accrued payroll and payroll taxes       2,155       2,435       (1,212)
    Increase (decrease) in other accrued expenses                 16,547      (8,904)       6,562
    Increase (decrease) in accrued income taxes                    7,182        (655)       3,584
- --------------------------------------------------------------------------------------------------
     Net cash provided by operating activities                   132,077     153,420      161,255
- --------------------------------------------------------------------------------------------------
Cash flows from investing activities:
  Property, plant and equipment additions                       (108,740)    (93,888)     (60,224)
  Sale of equipment                                                1,963       1,228        2,096
  Acquisition of businesses, net of cash acquired                (51,083)    (13,629)         --
  Other, net                                                         --       (1,500)         --
- --------------------------------------------------------------------------------------------------
     Net cash used in investing activities                      (157,860)   (107,789)     (58,128)
- --------------------------------------------------------------------------------------------------
Cash flows from financing activities:
  Issuance (repayment) of notes payable                            4,155      (4,419)     (10,850)
  Repayment of long-term debt                                    (11,895)     (1,036)      (1,236)
  Payment of dividends                                           (25,809)    (22,738)     (18,947)
  Exercise of employee stock options                               6,794       5,301          914
- --------------------------------------------------------------------------------------------------
     Net cash used in financing activities                       (26,755)    (22,892)     (30,119)
- --------------------------------------------------------------------------------------------------
Effect of exchange rate changes on cash                           (4,919)     (3,023)       1,216
- --------------------------------------------------------------------------------------------------
Net change in cash and cash equivalents                          (57,457)     19,716       74,224

Cash and cash equivalents at beginning of year                   103,685      83,969        9,745
- --------------------------------------------------------------------------------------------------
Cash and cash equivalents at end of year                        $ 46,228    $103,685      $83,969
- --------------------------------------------------------------------------------------------------
Supplemental disclosures of cash flow information:
  Income taxes paid                                             $ 74,518    $ 81,802      $68,187
  Interest paid, net of capitalized interest                         783       1,390        1,922

The accompanying notes are an integral part of these statements.
</TABLE>

(Pages 20-27 of the 1997 Annual Report to Shareholders)

                      NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1 - SUMMARY OF SIGNIFICANT 
ACCOUNTING POLICIES
Principles of Consolidation:
 The consolidated financial statements include the accounts of the
Company and all majority-owned subsidiaries. All significant
intercompany accounts and transactions have been eliminated.

Financial Instruments:
 The Company considers its temporary cash investments, which have
original maturities of three months or less, to be cash
equivalents.
 The Company has no financial instruments that have a materially
different fair value than the respective instrument's carrying
value. Gains and losses on hedges of existing assets or
liabilities are recognized monthly and are included in selling,
general and administrative expenses. See Note 5 - Financial
Derivatives and Risk Management for further information regarding
the Company's hedging activities.

Property, Plant and Equipment:
 The cost of property, plant and equipment is depreciated over the
estimated useful lives of the assets using the straight-line
method with lives ranging from three to twelve years for machinery
and equipment and fifteen to forty years for buildings and
improvements. The Company capitalizes interest as part of the cost
of constructing major facilities and equipment.

Goodwill:
 Goodwill arising from acquisitions made by the Company is
capitalized and amortized over a period of five to forty years.

Minority Interest:
 Minority interest in income, related to the Company's 75% interest
in Riedel-de Haen through a joint venture with AlliedSignal, is
eliminated.

Net Income Per Share:
 Net income per share is based on the weighted average number of
shares outstanding during each period.

Foreign Currency Translation:
 Foreign currency assets and liabilities are translated at current
exchange rates and profit and loss accounts are translated at
weighted average exchange rates. Resulting translation gains and
losses are included as a separate component of stockholders'
equity.

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 and disclosure of contingent assets and
liabilities at the date of the financial statements and the
reported amounts of revenues and expenses during the year. Actual
results could differ from those estimates.

NOTE 2 - INVENTORIES
 The principal categories of inventories are (in thousands):

                                     December 31,
                                 1997            1996
- --------------------------------------------------------
Finished goods                 $336,295        $288,293
Work in process                  24,269          22,132
Raw materials                    60,245          52,359
- --------------------------------------------------------
Total                          $420,809        $362,784
- --------------------------------------------------------

 Chemical products are valued at the lower of cost or market. Costs
for certain domestic chemical inventories (24% of total chemical
inventories) are determined using the last-in, first-out method.
Costs for other chemical inventories are determined by specific
lot using purchase price and cost to manufacture, which includes
material, labor and overhead. If the cost of all chemical
inventories had been determined using the specific cost method,
inventories would have been $3,252,000, $6,538,000, $8,062,000 and
$7,410,000 higher than reported at December 31, 1997, 1996, 1995
and 1994, respectively.
 Metal inventories are valued at the lower of cost or market, cost
being determined using the first-in, first-out method, which
includes material, labor and overhead.

NOTE 3 - NOTES PAYABLE
 The Company has three unsecured domestic bank revolving credit
facilities totaling $70,000,000. A $40,000,000 facility expires in
May 1998, with two other facilities of $15,000,000 each expiring
in June 1998, or earlier upon notice by either party. The Company
also has two unsecured multi-currency bank commitments totaling
$30,000,000. One facility expires in June 1998, the other in June
1999. Interest rates for all facilities are based on federal
funds, LIBOR, prime or other rates offered by the lending banks.
No borrowings were outstanding under the domestic or multi-
currency facilities at December 31, 1997 or 1996. The Company
intends to renew all of these facilities before they expire.
 Notes payable by international subsidiaries were $6,751,000 and
$2,615,000 at December 31, 1997 and 1996, respectively, and are
payable in local currencies with weighted average interest rates
of 5.3% and 8.3% at December 31, 1997 and 1996, respectively.

NOTE 4 - LONG-TERM DEBT
 Long-term debt consists of the following (in thousands):

                                  December 31,
                                1997         1996
- ---------------------------------------------------
6.0% Industrial Revenue       $   -         $5,775
 Bonds due April 1, 2010
5.875% Industrial Revenue         -          3,550
 Bonds due July 1, 2004
7.0% Industrial Revenue           -          2,700
 Bonds due Nov. 1, 2014
Other                          1,201         1,216
- ---------------------------------------------------
                               1,201        13,241
Less-Current maturities         (649)       (9,454)
- ---------------------------------------------------
                               $ 552       $ 3,787
- ---------------------------------------------------

 The 6.0%, 5.875% and the 7.0% Industrial Revenue Bonds were
redeemed by the Company at par on March 1, 1997, July 1, 1997 and
November 1, 1997, respectively.

 Total interest expense incurred by the Company, net of immaterial
amounts capitalized, was $734,000, $1,824,000 and $1,647,000 in
1997, 1996 and 1995, respectively.

NOTE 5 - FINANCIAL DERIVATIVES AND 
RISK MANAGEMENT
 The Company operates internationally, giving rise to exposure
resulting from changes in foreign currency exchange rates.
Derivative financial instruments are utilized by the Company to
reduce the financial impact of those exposures. The Company does
not hold or issue such financial instruments for trading purposes.
 The Company enters into forward exchange contracts to hedge
certain receivables and payables denominated in foreign currencies
(principally the British pound sterling, Italian lira, German
mark, French franc, Swiss franc, Japanese yen and Canadian
dollar). Some of the contracts involve the exchange of two foreign
currencies, according to the requirements of international
subsidiaries. The purpose of the Company's hedging activities is
to protect the Company from the risk that the receipts resulting
from product sales to customers outside the United States and
payments for purchases from vendors outside the United States will
be adversely affected by changes in exchange rates from the
original transaction date. The amount of open forward exchange
contracts at December 31, 1997 and 1996 was $243.4 million and
$159.1 million, respectively. The terms of the contracts are
generally less than six months.
 The Company's contracts are with large, reputable commercial banks
and, accordingly, the Company expects all counterparties to meet
their obligations.

NOTE 6 - LEASE COMMITMENTS
 The Company and its subsidiaries lease manufacturing and warehouse
facilities and computer equipment under non-cancelable leases
expiring at various dates through 2022. Rent charged to operations
was $10,054,000, $8,676,000 and $8,322,000 in 1997, 1996 and 1995,
respectively. Minimum rental commitments for non-cancelable leases
in effect at December 31, 1997, are as follows (in thousands):

                    1998         $10,330
                    1999           7,425
                    2000           3,573
                    2001           1,989
                    2002           1,726
                    2003-2022     12,348

NOTE 7 - INCOME TAXES
 The provision for income taxes consists of the following (in
thousands):
                           1997       1996      1995
- -------------------------------------------------------
Current:
 Federal                 $65,630    $58,376   $55,721
 State                     6,141      6,609     6,399
 International             9,930     14,925     9,320
- -------------------------------------------------------
  Total current           81,701     79,910    71,440
- -------------------------------------------------------
Deferred:
 Federal                   4,554      1,833      (394)
 State                       615        482       (74)
 International              (175)      (397)    1,505
- -------------------------------------------------------
  Total deferred           4,994      1,918     1,037
- -------------------------------------------------------
Total provision for
 income taxes            $86,695    $81,828   $72,477
- -------------------------------------------------------

 A reconciliation of statutory and effective tax rates is
as follows:
                                 1997        1996        1995
- --------------------------------------------------------------
Statutory tax rate               35.0%       35.0%       35.0%
FSC benefits                     (2.0)       (1.4)       (1.7)
State income taxes,
 net of federal benefits          1.7         1.9         2.0
International taxes               (.6)         .2         (.5)
Other, net                         .2         (.1)         .7
- --------------------------------------------------------------
                                 34.3%       35.6%       35.5%
- --------------------------------------------------------------

 Deferred income tax provisions reflect the effect of temporary
differences between financial statement and tax reporting of
income and expense items. The net deferred tax asset (liability)
at December 31, which are included in other assets or other
liabilities in the consolidated balance sheets, result from the
following temporary differences (in thousands):

                                          1997        1996
- ------------------------------------------------------------
Gross deferred assets:
Inventories                             $18,856     $18,367
Pension and postretirement
 benefit plans                           14,624      13,794
- -------------------------------------------------------------
  Total                                  33,480      32,161
- -------------------------------------------------------------
Gross deferred liabilities:
Depreciation                            (24,700)    (19,867)
Other                                   (11,992)    (10,512)
- -------------------------------------------------------------
  Total                                 (36,692)    (30,379)
- -------------------------------------------------------------
Net deferred tax asset (liability)      $(3,212)    $ 1,782
- -------------------------------------------------------------

 At December 31, 1997 and 1996, no valuation allowance for the
deferred tax assets was required.
 United States taxes are not provided on unremitted earnings and
related cumulative translation adjustments of international
subsidiaries (approximately $132 million at December 31, 1997)
because the Company intends to reinvest the earnings indefinitely.
The estimated amount of income taxes that would be incurred should
such earnings be distributed is not significant due to the
availability of foreign tax credits. The Company has a Foreign
Sales Corporation ("FSC") subsidiary which is taxed at a lower
effective tax rate on its income from export sales from the U.S.

NOTE 8 - INSURANCE
 The Company's general and products liability insurance coverage,
which provides for risks up to $200 million, was renewed during
1997. The current policies provide limited coverage for
environmental damage and are written on a claims-made basis.

NOTE 9 - COMMON STOCK
 In November 1996, the Company declared a two-for-one common stock
split effected in the form of a 100% stock dividend to
stockholders of record on December 16, 1996. Since the par value
of the common stock remains unchanged, the increased shares
effected by the stock split resulted in a transfer from retained
earnings to common stock during 1996. Unless otherwise noted, all
share and per share information has been restated to reflect this
stock split.

 The Company's deferred compensation plan provides for cash and
common stock payments to certain key employees. Under this plan, a
bonus pool is calculated by a formula based on the amount of
increase in profitability. Bonus units are then awarded. Bonus
units are distributed five years after being awarded in the form
of one share of common stock for each bonus unit. In addition, the
Company makes cash payments equal to the amount of Federal income
taxes the employee would be required to pay for the receipt of
such stock and cash at the highest marginal Federal income tax
rate. Expenses for this plan are recorded during the period for
which the calculation is made. During 1997, 1996 and 1995, 23,000,
15,534 and 35,800 shares of common stock, respectively, were
issued under this plan. At December 31, 1997, 158,200 bonus units
were awarded but not distributed. This plan permits issuance of a
maximum of 2,400,000 shares of the Company's common stock, of
which 1,559,210 shares remain to be awarded.
 The Company's Share Option Plan of 1995, which replaced the share
option plan of 1987, permits the granting of incentive stock
options or non-qualified options to purchase up to 4,000,000
shares of the Company's common stock through 2005. Incentive stock
options may not have an option price of less than the fair market
value of the shares at the date of the grant. Options generally
become exercisable one year following the grant date and expire
ten years after the grant date. Options granted in 1997 to
purchase 160,000 shares become exercisable over a one to five year
period. Options granted in 1996 to purchase 249,000 shares become
exercisable over a one to five year period. Options to purchase
1,814,000 shares of the Company's common stock under this plan
remain to be granted at December 31, 1997.
 The Company's Share Option Plan of 1987 permitted the granting of
incentive stock options or non-qualified options to
purchase up to 2,000,000 shares of the Company's common
stock through 1997. Options granted had an option price equal to
the market value of the shares at the date of the grant. Options
are generally exercisable one year following the grant date.
Options granted in 1994 and 1993 to purchase 320,000 and 260,000
shares, respectively, become exercisable ratably over a five year
period. The balance of the shares that had been reserved for
issuance under this plan were released.
 The Company has adopted the disclosure-only provisions of
Statement of Financial Accounting Standards No. 123, "Accounting
for Stock-Based Compensation." Accordingly, no compensation cost
has been recognized for the stock option plans. Had compensation
cost for the Company's two stock option plans been determined
based on the fair value at the grant date for awards in 1997 and
1996 consistent with the provisions of this statement, the
Company's net income and net income per share would have been as
follows (in thousands, except net income per share):

                                   1997          1996
- -------------------------------------------------------
Net income                      $157,478      $141,562
Net income per share - Basic       $1.57         $1.42
Net income per share - Diluted     $1.53         $1.39

 The fair value of each option grant is estimated on the date of
grant using the Black-Scholes option-pricing model with the
following weighted-average assumptions for 1997: dividend yield of
 .70%, expected volatility of 17.9%, risk-free interest rate of
5.75% and expected life based on historical exercise periods of
6.5 years. The weighted-average assumptions for 1996 were as
follows: dividend yield of .74%, expected volatility of 17.6%,
risk-free interest rate of 6.50% and expected life based on
historical exercise periods of 5.75 years.

 A summary of the combined activity and balances for the Company's
stock options for the two plans as of December 31, 1997, 1996 and
1995 and changes during the years ended on those dates is as
follows:
<TABLE>
                                                      1997                     1996                       1995
- ------------------------------------------------------------------------------------------------------------------------
                                                          Wtd. Avg.                 Wtd. Avg.                 Wtd. Avg.
                                                          Exercise                  Exercise                  Exercise
                                               Shares      Price        Shares        Price        Shares       Price
- ------------------------------------------------------------------------------------------------------------------------
<S>                                         <C>           <C>         <C>           <C>         <C>           <C>                 
Options outstanding, beginning of year       2,396,636     $23.43     1,736,376      $21.31      1,809,980     $21.22
Options granted                              1,170,000      35.42       984,000       25.69         42,000      22.15
Options exercised                             (310,388)     22.17      (279,740)      19.41        (54,700)     16.71
Options cancelled                              (27,550)     24.17       (44,000)      21.83        (60,904)     23.13
- ------------------------------------------------------------------------------------------------------------------------
Options outstanding, end of year             3,228,698      27.91     2,396,636       23.43      1,736,376      21.31
- ------------------------------------------------------------------------------------------------------------------------
Options exercisable at year-end              2,066,702      23.64     1,419,436       21.70      1,692,176      21.29
Weighted average fair value of
 options granted during the year                $11.16                   $8.02                       $6.85
</TABLE>

 The following table summarizes information about stock options outstanding 
at December 31, 1997:
<TABLE>
                                          Options Outstanding                        Options Exercisable
- ----------------------------------------------------------------------------------------------------------
                               Number           Wtd. Avg.           Wtd. Avg.       Number       Wtd. Avg.
                             Outstanding        Remaining           Exercise      Exercisable    Exercise
Range of Exercise Prices     at 12/31/97     Contractual Life        Price        at 12/31/97      Price
- ----------------------------------------------------------------------------------------------------------
<S>                           <C>            <C>                   <C>          <C>             <C>                        
$10.1875 to $14.5625            51,872          7.2 months           $10.78           51,872       $10.78
$16.25 to $24.00               702,850         75.4 months            19.37          702,850        19.37
$24.875 to $31.25            1,361,980         84.3 months            26.56        1,311,980        26.42
$31.75 to $36.00             1,111,996        117.6 months            35.71              --            --
- -----------------------------------------------------------------------------------------------------------
                             3,228,698         92.6 months           $27.91        2,066,702       $23.64
- -----------------------------------------------------------------------------------------------------------
</TABLE>

NOTE 10 - COMPANY OPERATIONS BY SEGMENT
 The Chemical Products segment distributes biochemicals, organic
chemicals, chromatography products, diagnostic reagents and
related products for use in research and development, in the
diagnosis of disease and in manufacturing. These products are both
manufactured by the Company and purchased for resale. The Metal
Products segment manufactures and distributes components for metal
frameworks used in industry to support pipes, lighting fixtures
and conduit, continuous networks of trays used in routing power
and telecommunications cabling, and electrical and electronics
enclosures. Sales between these two industry segments are not
significant. Cash and temporary cash investments are considered
available for general corporate purposes and, accordingly, are not
allocated to the identifiable assets of either segment. The United
States sales to unaffiliated customers presented in the summary of
operations by geographic segment on page 25 include sales to
international markets as follows (in thousands):

                      Year                 Amount
                ---------------------------------------
                      1997                $ 82,824
                      1996                 106,154
                      1995                 107,255


 The Company's operations by industry segment are as follows (in thousands):

<TABLE>
                                                 1997             1996          1995
- --------------------------------------------------------------------------------------
<S>                                         <C>             <C>             <C> 
Net sales to unaffiliated customers:
  Chemical Products                          $  901,701      $  832,924      $775,862
  Metal Products                                225,383         201,641       183,960
- --------------------------------------------------------------------------------------
   Total                                     $1,127,084      $1,034,565      $959,822
- --------------------------------------------------------------------------------------
Income before provision for income taxes:
  Chemical Products                          $  214,282      $  193,075      $177,334
  Metal Products                                 33,717          31,395        27,916
  Interest income (expense), net                  4,755           5,214        (1,090)
- --------------------------------------------------------------------------------------
   Total                                     $  252,754      $  229,684      $204,160
- --------------------------------------------------------------------------------------
Depreciation:
  Chemical Products                          $   37,441      $   36,221      $ 33,312
  Metal Products                                  6,056           5,007         4,239
- ---------------------------------------------------------------------------------------
   Total                                     $   43,497      $   41,228      $ 37,551
- ---------------------------------------------------------------------------------------
Capital expenditures:
  Chemical Products                          $   96,228      $   77,541      $ 45,397
  Metal Products                                 12,512          16,347        14,827
- ---------------------------------------------------------------------------------------
   Total                                     $  108,740      $   93,888      $ 60,224
- ---------------------------------------------------------------------------------------
Identifiable assets at December 31:
  Chemical Products                          $1,044,806      $  860,676      $789,058
  Metal Products                                152,788         135,597       112,161
  Cash and temporary cash investments            46,228         103,685        83,969
- ---------------------------------------------------------------------------------------
   Total                                     $1,243,822      $1,099,958      $985,188
- ---------------------------------------------------------------------------------------
</TABLE>

 The Company's operations by geographic segment are as follows (in thousands):
<TABLE>
                                                      1997          1996          1995
- -----------------------------------------------------------------------------------------
<S>                                              <C>           <C>            <C>    
Net sales to unaffiliated customers:
  United States                                   $  705,978    $  683,810     $ 641,167
  International                                      421,106       350,755       318,655

Net intercompany sales between geographic areas:
  United States                                      195,115       146,202       125,652
  International                                       42,252        39,268        36,735
  Eliminations                                      (237,367)     (185,470)     (162,387)
- -----------------------------------------------------------------------------------------
   Total                                          $1,127,084    $1,034,565      $959,822
- -----------------------------------------------------------------------------------------
Income before provision for income taxes:
  United States                                   $  245,586    $  192,415      $172,308
  International                                       31,553        41,664        36,760
  Eliminations                                       (24,385)       (4,395)       (4,908)
- ------------------------------------------------------------------------------------------
   Total                                          $  252,754    $  229,684      $204,160
- ------------------------------------------------------------------------------------------
Identifiable assets at December 31:
  United States                                   $  836,524    $  783,699      $695,326
  International                                      450,082       348,732       307,902
  Eliminations                                       (42,784)      (32,473)      (18,040)
- ------------------------------------------------------------------------------------------
   Total                                          $1,243,822    $1,099,958      $985,188
- ------------------------------------------------------------------------------------------
</TABLE>

NOTE 11 - PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
Pension and Retirement Savings Plans
 The Company and its subsidiaries have several retirement plans
covering substantially all U.S. employees and certain employees of
international subsidiaries. The Company's defined benefit plans
provide all eligible employees with a retirement benefit based
upon compensation and years of service with the Company.
 The net periodic pension cost for the Company's defined benefit
plans is as follows (in thousands):
<TABLE>

                                         United States                 International
                                 ------------------------------  -------------------------
                                   1997       1996       1995     1997     1996     1995
- ------------------------------------------------------------------------------------------
<S>                              <C>         <C>        <C>      <C>      <C>      <C>       
Service cost                     $ 3,159     $2,928     $1,673   $2,149   $2,082   $1,997
Interest cost                      3,765      3,284      2,391    2,269    2,169    2,123
Actual return on plan assets     (11,539)    (5,254)    (6,918)  (3,816)  (3,247)  (3,508)
Net amortization and deferral      7,681      2,908      4,280      709      358      790
- ------------------------------------------------------------------------------------------
Net periodic pension cost        $ 3,066     $3,866     $1,426   $1,311   $1,362   $1,402
- ------------------------------------------------------------------------------------------
</TABLE>

 The Company's funding policy for its U.S. defined benefit plan is
to contribute amounts that meet minimum funding requirements but
which do not exceed the maximum funding limits as currently
determined under applicable tax regulations. International plans
are funded at a level to maintain the solvency of the plans as
defined by local law. At December 31, 1997, assets of the
Company's defined benefit plans were invested in listed common
stocks, common trust funds, government and corporate bonds and
money market instruments. No common stock of the Company is held
by these plans.
 The funding status of the Company's defined benefit plans and
amounts recognized with respect to these plans in the consolidated
balance sheets are as follows (in thousands):
<TABLE>
                                                     United States               International
                                                  --------------------      --------------------
                                                   1997          1996         1997         1996
- ------------------------------------------------------------------------------------------------
<S>                                               <C>          <C>          <C>          <C>         
Actuarial present value of benefit obligations:
  Vested                                          $43,293      $38,796      $36,816      $35,489
- -------------------------------------------------------------------------------------------------
  Accumulated                                     $44,805      $40,829      $36,816      $35,489
- -------------------------------------------------------------------------------------------------
  Projected                                       $52,372      $47,387      $45,655      $44,320
Plan assets at fair value                          59,188       52,372       50,629       47,353
- -------------------------------------------------------------------------------------------------
Excess of plan assets over projected
 benefit obligations                                6,816        4,985        4,974        3,033
Unrecognized net (gain)                            (5,054)      (2,767)      (2,822)      (1,346)
Unrecognized prior service cost                    10,213       11,003        1,443        1,649
Unrecognized net transition asset                    (636)        (726)        (215)        (268)
- --------------------------------------------------------------------------------------------------
Prepaid pension cost                              $11,339      $12,495      $ 3,380       $3,068
- --------------------------------------------------------------------------------------------------
</TABLE>

 Assumptions used in the preceding determinations reflect average long-term
expectations, may not represent current experience and are as follows:
<TABLE>

                                                       United States     International
                                                       -------------     --------------
                                                       1997     1996     1997     1996
- ---------------------------------------------------------------------------------------
<S>                                                   <C>      <C>      <C>      <C>        
Discount rate in determining benefit obligations       7.0%     7.5%     5.4%     4.6%
Compensation rate increase                             5.0%     5.5%     4.3%     3.7%
Return on plan assets                                  9.0%     9.0%     6.8%     6.8%
</TABLE>

 The Company's 401(k) retirement savings plan provides eligible
employees with retirement benefits in addition to those provided
by the defined benefit plan. The plan permits participants to
voluntarily defer up to 15% of their compensation, subject to
Internal Revenue Code limitations. The Company also contributes a
fixed amount per year for each eligible employee plus a percentage
of the employee's contribution. The Company's policy is to fully
fund this plan. The cost for this plan was $5,798,000, $5,504,000
and $2,829,000 for the years ended December 31, 1997, 1996 and
1995, respectively.

Other Postretirement Benefits
 Certain employees of U.S. operations who retire on or after
attaining age 55 with at least 7 years of service with the Company
are entitled to postretirement health, dental and life coverages.
These benefits are subject to deductibles, co-payment provisions
and coordination with benefits available under Medicare. The
Company may amend or change the plan periodically.
 The components of net postretirement benefit cost for 1997, 1996,
and 1995 are as follows (in thousands):

                                1997        1996        1995
          ---------------------------------------------------
          Service cost         $1,436      $1,544      $1,346
          Interest cost         2,362       2,195       2,238
          Amortization             (6)         --          --
          ----------------------------------------------------
          Net postretirement
           benefit cost        $3,792      $3,739      $3,584
          ----------------------------------------------------

 A reconciliation of the plan's funded status to the accrued
postretirement benefit liability included in the consolidated
balance sheets at December 31, is as follows (in thousands):

                                     1997          1996
- ---------------------------------------------------------
Accumulated postretirement
 benefit obligation:
  Retirees                         $ 9,318       $ 8,078
  Active - fully eligible            8,862         6,471
  Active - other                    17,718        16,175
- ---------------------------------------------------------
   Total                            35,898        30,724
Plan assets at fair value               --            --
- ---------------------------------------------------------
Unfunded postretirement
 benefit obligation                 35,898        30,724
Unrecognized net gain                  577         3,042
- ---------------------------------------------------------
Accrued postretirement
 benefit liability                  36,475        33,766
Less-Current portion included in
 other accrued expenses             (1,000)         (848)
- ---------------------------------------------------------
Deferred postretirement
 benefits liability                $35,475       $32,918
- ---------------------------------------------------------

 Future benefit costs were estimated assuming medical costs
increase at an 8.5% annual rate in 1997 decreasing ratably until
the year 2000 to a 5.5% growth rate and remaining at 5.5% per year
thereafter. A 1.0% increase in this annual trend rate would have
increased the accumulated postretirement benefit obligation at
December 31, 1997 by $1,740,000 and 1997 postretirement benefit
expense by $200,000. The weighted average discount rate used to
estimate the accumulated postretirement benefit obligation at
December 31, 1997 is 7.0%. Benefits are funded as claims are paid.

NOTE 12 - EARNINGS PER SHARE
 The Company adopted SFAS No. 128, "Earnings per Share," effective
December 15, 1997. As a result, the Company's earnings per share
for 1996 and 1995 were restated. A reconciliation of basic and
diluted earnings per share, together with the related shares
outstanding, and the effect of this change on previously 
reported earnings per share (EPS) is as follows, (in thousands,
except per share amounts):

               Reconciliation of Earnings and Shares
                                                          Per-Share
                                 Income         Shares      Amount
                                 ----------------------------------
For the Year Ended 1995
Basic Earnings per Share
Net income available to
 common shareholders            $131,683         99,714       $1.32
Options issued                        --          1,529
- -------------------------------------------------------
Diluted Earnings per Share
Net income available to
 common shareholders            $131,683        101,243       $1.30
- ------------------------------------------------------------------------

For the Year Ended 1996
Basic Earnings per Share
Net income available to
 common shareholders            $147,856         99,930       $1.48
Options issued                        --          1,785
- -------------------------------------------------------
Diluted Earnings per Share
Net income available to
 common shareholders            $147,856        101,715       $1.45
- ------------------------------------------------------------------------

For the Year Ended 1997
Basic Earnings per Share
Net income available to
 common shareholders            $166,059        100,210       $1.66
Options issued                        --          2,594
- -------------------------------------------------------
Diluted Earnings per Share
Net income available to
 common shareholders            $166,059        102,804       $1.62
- -----------------------------------------------------------------------

                     Effect on Previously Reported EPS

                                                   1996        1995
- -----------------------------------------------------------------------
Per share amounts
Primary EPS as reported                           $1.48       $1.32
Effect of SFAS No. 128                               --          --
- -----------------------------------------------------------------------
Basic EPS as restated                             $1.48       $1.32
- -----------------------------------------------------------------------
Fully diluted EPS as reported                     $1.48       $1.32
Effect of SFAS No. 128                            (0.03)      (0.02)
- -----------------------------------------------------------------------
Diluted EPS as restated                           $1.45       $1.30
- -----------------------------------------------------------------------



<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           46228
<SECURITIES>                                         0
<RECEIVABLES>                                   193378
<ALLOWANCES>                                      6531
<INVENTORY>                                     420809
<CURRENT-ASSETS>                                706674
<PP&E>                                          756584
<DEPRECIATION>                                  317706
<TOTAL-ASSETS>                                 1243822
<CURRENT-LIABILITIES>                           119479
<BONDS>                                            552
<COMMON>                                        100377
                                0
                                          0
<OTHER-SE>                                      959957
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