SIGMA ALDRICH CORP
10-K, 1997-03-27
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, 1996           
                                 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. [ ]

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

        $3,101,903,230                                    March 7, 1997 
- ----------------------------------             ------------------------------
             Value                                      Date of Valuation 

     Number of shares of the registrant's common stock, $1.00 par value,
outstanding as of March 7, 1997 was 100,099,885.

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

Documents Incorporated by Reference  Parts of Form 10-K into which Incorporated
- -----------------------------------  ------------------------------------------
Pages 11-24 of the Annual Report to
  Shareholders for the year ended
  December 31, 1996                  Parts I, II and IV

Proxy Statement for the 1997 Annual
  Meeting of Shareholders            Part III

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

                                  PART I
- -------------------------------------------------------------------------------

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 80,000 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.

     Aldrich also offers approximately 71,500 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.); 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 80,000 products listed in the Sigma, Aldrich,
Fluka and Supelco catalogs, the Company produced approximately 31,000
which accounted for 47% of the net sales of chemical products for the
year ended December 31, 1996.  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 290 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 2,700,000 comprehensive catalogs for the Sigma, Aldrich,
Fluka 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 330
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, 1996. 

     During the year ended December 31, 1996, products were sold to
approximately 138,000 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 $250.  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 1996.  During the year ended
December 31, 1996, 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, 1996, 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 and Supelco,
through distributors and by subsidiaries organized in Australia, Austria,
Belgium, Brazil, Canada, Czech Republic, France, Germany, Hungary, India,
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, 1996, 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 21 and 22 of the 1996 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", "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 900 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 and Modesto, California.  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 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 one regional warehouse and 44 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 and cable tray
component systems, 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 5,984 persons as of December 31, 1996.  Of
these, 4,706 were engaged in production and distribution of chemical
products.  The B-Line subsidiary employed 1,278 persons.  The total
number of persons employed within the United States was 4,265, 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 220
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, 1996 and 1995, 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, 1996 back-log will be
shipped during 1997. 
 
      On December 31, 1996 and 1995, the back-log of orders at B-Line
was not significant.  B-Line expects that substantially all of the
December 31, 1996 back-log will be shipped during 1997.
 
(f) Information as to Industry Segments.                   
- -------------------------------------------------------------------------------
 
     Information concerning industry segments for the years ended
December 31, 1996, 1995 and 1994, is located in Note 10 to the
consolidated financial statements on pages 21 and 22 of the 1996 Annual
Report which is incorporated herein by reference.

(g) Executive Officers of the Registrant.                              
- -------------------------------------------------------------------------------
              
     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 currently being 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 and a 45,000 square foot building used for production,
quality control and packaging.  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.  In Milwaukee, the Company
owns a 178,000 square foot building which is used for manufacturing,
warehousing and offices, a 110,000 square foot building which is used for
additional manufacturing and warehousing and a complex of buildings
aggregating 331,000 square feet which is used primarily for warehousing
and distribution.  Also in Milwaukee, the Company owns a 151,000 square
foot building which is used for manufacturing and warehousing, a 56,000
square foot administration facility and a 619,000 square foot building
which is being renovated for use as a distribution facility.  The Company
also owns 515 acres in Sheboygan, Wisconsin, upon which are located
multiple buildings totaling 332,000 square feet for production and
packaging.  Fluka owns an 11 acre site in Buchs, Switzerland, upon which
are located its primary production facilities. Approximately 242,000
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 72 acres near Bellefonte, Pennsylvania, upon which is
located a 160,000 square foot building used for manufacturing,
warehousing, research and administration.

     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 270,000 square foot building in Highland, Illinois, a 55,000 square
foot building in Troy, Illinois, a 68,000 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 125,000 square foot
building in Modesto, California.  B-Line leases a 101,000 square foot
facility in Norcross, Georgia and a 120,000 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 under a short-term lease.  Manufacturing and/or
warehousing facilities are also owned or leased in the United Kingdom,
France, Germany, Israel, Japan, Scotland 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 will 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 1996.

                              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,
1996 and 1995, is located on page  11 of the 1996 Annual Report which is
incorporated herein by reference.

     As of March 7, 1997, there were 2,086 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, and Financial
- ------------------------------------------------------------------------
Statements and Supplementary Data.
- ----------------------------------

     The information required by Items 6 through 8 is incorporated
herein by reference to pages 11-24 of the 1996 Annual Report.  See Index
to Financial Statements and Schedules on page F-1 of this report.  Those
pages of the Company's 1996 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 1997 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            49   Vice President, Information
                                        Services
     Carl T. Cori                  60   Chairman of the Board and
                                        Chief Executive Officer
     Peter A. Gleich               51   Vice President, Treasurer and
                                        Chief Financial Officer
     David R. Harvey               57   President and Chief Operating
                                        Officer
     James W. Meteer               46   Vice President, Quality
     Kirk A. Richter               50   Controller
     Thomas M. Tallarico           52   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.

Dr. Cori has been Chief Executive Officer of the Company for more than
five years.  He was elected Chairman of the Board in May 1991 and 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 Vice President of the Company for more than five
years.  He was Secretary of the Company for more than five years until
November 1994.  He also served as Treasurer and Chief Financial Officer
of the Company from 1975 to May 1991.

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 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.

Mr. Richter has held the position indicated 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
1997 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 1997 Proxy
Statement is incorporated herein by reference.

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

     Information under the caption "Director Compensation and
Transactions" of the 1997 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 1996 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 28, 1997
              -------------------------------------  --------------
              Peter A. Gleich, Vice President,            Date
              Treasurer 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, 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 28, 1997
          ------------------------------------------      --------------
          Carl T. Cori, Director, Chairman of the               Date
          Board and Chief Executive Officer   
                 
     By   /s/     David R. Harvey                         March 28, 1997
          ------------------------------------------      --------------
          David R. Harvey, Director, President and              Date
          Chief Operating Officer

     By   /s/     Peter A. Gleich                         March 28, 1997
          ------------------------------------------      --------------
          Peter A. Gleich, Vice President, Treasurer            Date
          and Chief Financial Officer

     By   /s/     Kirk A. Richter                         March 28, 1997
          ------------------------------------------      --------------
          Kirk A. Richter, Controller                           Date

     By   /s/     Thomas M. Tallarico                     March 28, 1997
          ------------------------------------------      --------------
          Thomas M. Tallarico, Vice President and               Date
          Secretary
              
     By   /s/     David M. Kipnis                        March 28, 1997
          ------------------------------------------     --------------
          David M. Kipnis, Director                             Date


     By   /s/     Andrew E. Newman                        March 28, 1997
          -----------------------------------------       --------------
          Andrew E. Newman, Director                            Date

     By   /s/     Jerome W. Sandweiss                     March 28, 1997
          -----------------------------------------       --------------
          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
  1996, 1995, 1994, 1993 and 1992                                  11

Management's discussion of financial 
  condition and results of operations                              12


FINANCIAL STATEMENTS:

     Consolidated Balance Sheets             
        December 31, 1996 and 1995                                 15

     Consolidated statements for the years 
        ended December 31, 1996, 1995 and 1994

           Income                                                 14
           Stockholders' Equity                                   16
           Cash Flows                                             17

     Notes to consolidated financial statements                   18

     Report of independent public accountants                     14


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.


                               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 Exhibit 
       Amendments                         3(a) of Form 10-K filed for the year 
                                          ended December 31, 1991, Commission 
                                          File Number 0-8135. 

  (b)  By-Laws as amended June 1996       See Exhibit 3(b).

(4)  Instruments Defining the Rights of    
     Shareholders, Including Indentures:
        
  (a)  Certificate of Incorporation and   See Exhibit 3(a) above.
       Amendments        

  (b)  By-Laws as amended June 1996       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) Incentive Stock Bonus Plan*         Incorporated by reference to Exhibit
                                          10(a) of Form 10-K filed for the 
                                          year ended December 31, 1992, 
                                          Commission File Number 0-8135.

  (b) First Amendment to Incentive        Incorporated by reference to Exhibit
      Stock Bonus Plan*                   10(b) of Form 10-K filed for the
                                          year ended December 31, 1992, 
                                          Commission File Number 0-8135.
                                                        
  (c) Second Amendment to Incentive       Incorporated by refence to Exhibit
      Stock Bonus Plan*                   10(c) of Form 10-K filed for the
                                          year ended December 31, 1992, 
                                          Commission File Number 0-8135.

  (d) Third Amendment and                 See Exhibit 10(d).
      Restatement of the Incentive
      Stock Bonus Plan*
                                                        
  (e) 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.

  (f) First Amendment to Share Option     Incorporated by refence to Exhibit
      Plan of 1987*                       10(e) of Form 10-K filed for the
                                          year ended December 31, 1992, 
                                          Commission File Number 0-8135.
        
  (g) Second Amendment to Share           Incorporated by reference to
      Option Plan of 1987*                10(f) of Form 10-K filed for the
                                          year ended December 31, 1994, 
                                          Commission File Number 0-8135.
        
  (h) 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    for the year ended December 31, 1992
      S. Blazevich, Peter A. Gleich,      Commission File Number 0-8135.
      David R. Harvey, James W. Meteer,
      Kirk A. Richter and Thomas M.
      Tallarico)
        
 (i)  Letter re:  Consultation Services   Incorporated by reference to Exhibit
      with Dr. David M. Kipnis*           10 (g) of Form 10-K filed for the
                                          year ended December 31, 1992, 
                                          Commission File Number 0-8135.


 (j)  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 the
     of Per Share Earnings                information on net income per share
                                          included in Note 1 to the Company's
                                          1996 financial statements filed as
                                          Exhibit 13 below. 
                                                        

(13) Pages 11-24 of the Annual Report     See Exhibit 13.
     for the year ended December 31, 
     1996         

(21) Subsidiaries of Registrant           Page F-23 of this report.
        
(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.

   * Amended by Board resolution of 1/27/76.

   **  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 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.

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

       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.

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

       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.

             (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 resolution 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 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.

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

                             ARTICLE IV.  OFFICERS *

   * Restated pursuant to Board action of 5/3/83 and amended by Board 
     resolutions of 11/8/94 and 3/6/95.

       4.01. Number.  The principal officers of the Corporation shall be a
       Chairman of the Board of Directors, a President, 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.

       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
       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 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.

   ** 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.

      
     * 4.07.  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 or 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.

   * Amended by Board resolution of 3/6/95.

    ** 4.08. 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.

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

     * 4.09. The Treasurer.  The Treasurer shall be the Chief Financial
       Officer and, subject to the control of the Board of Directors, shall: 
       (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 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 him by the President or
       by the Board of Directors.  If required by the Board of Directors,
       the Treasurer shall give a bond for the faithful discharge of his
       duties in such sum and with such surety or sureties as the Board of
       Directors shall determine.  Whenever required by the Board of
       Directors so to do, he shall exhibit a true and complete statement of
       his cash account and of the securities and other funds in his
       possession, custody and control.  He shall at all reasonable times
       within business hours exhibit his books and accounts to any director.

   * Amended by Board resolution of 11/8/94.

       4.10. The Controller.  The Controller shall be in charge of the
       financial records of the Corporation, and shall, under the general
       supervision of the Treasurer, be responsible for the accounting and
       financial services of the Corporation.

    ** 4.11. 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.

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

       4.12. 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.

       4.13. 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 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 cancelled and no new certificate shall be issued
       until the former certificate for a like number of shares shall have
       been surrendered and cancelled, 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 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.

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

       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 has
       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.

   ** Amended by Board resolution of 2/18/86.

       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 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 10(d)

      THIRD AMENDMENT AND RESTATEMENT OF THE SIGMA-ALDRICH CORPORATION
                        INCENTIVE STOCK BONUS PLAN      


WHEREAS, Sigma-Aldrich Corporation (the "Corporation") previously established
the Sigma-Aldrich Corporation Incentive Stock Bonus Plan ("Plan"); and

WHEREAS, the Corporation reserved the right to amend the Plan pursuant to
Paragraph 15 thereof; and

WHEREAS, the Corporation desires to amend and restate the Plan effective
January 1, 1996;

NOW, THEREFORE, effective January 1, 1996, the Plan is amended and restated as
follows:

1.  Purpose

The purpose of the Incentive Stock Bonus Plan (the "Plan") is to provide a
means by which Sigma-Aldrich Corporation (the "Corporation") and/or its
subsidiary corporations shall be able to attract and retain competent key
employees (including officers and directors who are employees) and provide
such personnel with incentives in addition to current compensation reflecting
their efforts, initiative and skill.

2.  Administration

    a.            The Plan shall be administered by the Compensation
         Committee (the "Committee") of the Board of Directors of the
         Corporation (the "Board") as such Committee may be constituted from
         time to time.  The Committee shall consist of at least three members
         of the Board selected by the Board all of whom shall be both
         "Disinterested Persons" as defined in Rule 16b-3 under The Securities
         Exchange Act of 1934, and "Outside Directors" as defined in
         Regulations promulgated under Section 162(m) of the Internal Revenue
         Code of 1986, as amended.

    b.            All determinations of the Committee shall be made by
         all of its members unless specifically approved, authorized or
         ratified by the Board, in which event a determination by a majority
         of its members shall be sufficient.  Any decision or determination
         reduced to writing and signed by all of the members of the Committee
         shall be fully effective as if it had been made by a vote at a
         meeting duly called and held.

    c.            Subject to the express provisions of the Plan, the
         Committee also shall have complete authority to interpret the Plan,
         to prescribe, amend and rescind rules and regulations relating to it,
         and to make all other determinations necessary or advisable for the
         administration of the Plan.  The determinations of the Committee on
         the matters referred to in this Paragraph 2 shall be conclusive.

    d.             Participants in the Plan shall be selected by the
         Committee from key executive employees of the Corporation or any
         subsidiary of the Corporation who hold less than two percent (2%) of
         the outstanding stock of the Corporation (the "Participants").  It is
         intended that Participants include only those top executives whose
         responsibilities and activities have a substantial and direct impact
         on total corporate performance.

    e.             The Committee shall designate Participants each year
         and such Participants may, but need not, be the same as those who
         were designated in any preceding year; that is to say, employees
         designated as Participants in one year may be omitted in any and all
         subsequent years; new or additional Participants may be designated in
         any year.

3.  Stock Bonus Pool

    (a)      The maximum amount of the Bonus Pool for any given year shall be
determined as follows: if the increase in the Corporation's pre-tax operating
income for the year shall have exceeded by at least 10% but less than 12-1/2%
the greater of (a) the prior year's pre-tax operating income or (b) an amount
of pre-tax operating income which would represent a 10% per year cumulative
increase through the prior year over fiscal year 1977, the maximum amount
shall be 3% of the dollar amount of such increase; if the increase in pre-tax
operating income for the year shall have exceeded by at least 12-1/2% but less
than 15% the greater of (a) the prior year's pre-tax operating income or
(b) an amount of pre-tax operating income which would represent a 12-1/2% per
year cumulative increase through the prior year over fiscal year 1977, the
maximum amount shall be 4% of the dollar amount of such increase; and if the
increase in pre-tax operating income for the year shall have exceeded by at
least 15% the greater of (a) the prior year's pre-tax operating income or
(b) an amount of pre-tax operating income which would represent a 15% per year
cumulative increase through the prior year over fiscal year 1977, the maximum
amount shall be 5% of the dollar amount of such increase.

    (b)      In the event any additional business shall be acquired by the
Corporation as the result of any merger or acquisition, then the percentage
increase shall be determined by including the pre-tax operating income of the
merged or acquired business or businesses for all of the years involved in
determining the maximum Bonus Pool.

    (c)     In the event any portion of the Corporation's business shall be
discontinued, sold or otherwise transferred, then the percentage increase
shall be determined by excluding the pre-tax operating income of the
discontinued, sold or transferred business for all of the years involved in
determining the maximum Bonus Pool.

4.  Awards of Incentive Stock Bonus Units

    (a)     Within the first 90 days of each calendar year, the Committee shall
set the maximum dollar amount of incentive stock bonus units ("Incentive Stock
Bonus Units") and tax offset bonus units ("Tax Offset Bonus Units") which may
be awarded to the Corporation's Chief Executive Officer ("CEO") and Chief
Operating Officer ("COO"), respectively.  

    (b)     After the end of each calendar year but prior to the award of units,
the Committee shall certify, in writing, whether the Corporation's pre-tax
operating income for the year has exceeded one or more of the levels set in
Paragraph 3(a).  If, and only if, pre-tax operating income for the year shall
have reached a level sufficient to generate a Bonus Pool under Section 3, the
Committee shall allocate Incentive Stock Bonus Units and Tax Offset Bonus
Units for the CEO and COO.  The value of the Incentive Stock Bonus Units and
Tax Offset Bonus Units awarded to the CEO and COO can be less than, but cannot
exceed, the maximum dollar amount fixed by the Committee during the first 90
days of the calendar year.

    (c)     After the Committee has determined the Units to be awarded to the
CEO and COO, the Committee shall subtract from the Bonus Pool determined under
Section 3 the dollar value of the Incentive Stock Bonus Units awarded to the
CEO and COO.  If a positive value remains in the Bonus Pool after such
subtraction, the remaining dollar value of Incentive Stock Bonus Units shall
be awarded by the Committee to Participants (other than the CEO and COO)
designated by it, in such proportions as the Committee believes appropriate
based upon each Participant's relative contribution to the year's performance. 
Incentive Stock Bonus Units (and Tax Offset Bonus Units) shall initially be
valued at the last price or closing price of the Corporation's shares of
common stock on the day before the date of the awards, as reported in the
Midwest Edition of The Wall Street Journal or such other source as the
Committee shall determine properly reflects the market price.

    (d)     All awards shall be made within thirty (30) days after the end of
the first quarter of the year following the year for which the awards are
earned.

5.  Discontinuance

The Board may discontinue the Committee's authority to award said Incentive
Stock Bonus Units and Tax Offset Bonus Units or discontinue the Plan at any
time.  Notice of termination shall be given to all members of the Committee
and all previous Participants still in the employ of the Corporation prior to
April 30 of the year for which such termination shall become effective.

6.  Delivery and Payment

    (a)    Conditioned upon the Participant's continued employment by the
Corporation and/or its subsidiaries for five (5) full years after the year for
which the award is made, or  upon the Participant's earlier death, permanent
and total disability or retirement after the age of 65 (or prior thereto with
the consent of the Board of Directors) or  after the occurrence of a change in
control, as defined in subparagraph (c) below, of the Corporation, the
Corporation within ninety (90) days after the occurrence of any of such
events, shall issue to the Participant (or the personal representative or
heirs of a deceased Participant) that number of shares of the Corporation's
common stock which equals the number of Incentive Stock Bonus Units previously
awarded the Participant which have vested as a result of such event; and that
amount of cash equivalent to the value of that number of shares of common
stock equal to the number of Tax Offset Bonus Units awarded the CEO and COO
which have vested as a result of such event.  At that time, it shall also pay
to any Participant receiving shares (other than the CEO and COO) that amount
of cash which is equal to the amount of Federal taxes which such Participant
will be required to pay, during such year of payment, by reason of his receipt
of such stock and cash if he were subject to the highest marginal Federal
income tax rate.

                 For example, if, in the year of payment, the market value of
                 the stock is $100,000 and the highest Federal income tax rate
                 is 40%, then subtract 40% from 100% yielding 60% and divide
                 the market value of the stock issued ($100,000) by 60% which
                 equals $166,666.  Then subtract the market value of the stock
                 ($100,000) leaving the sum of $66,666, which is the amount of
                 cash to be paid.

The market value of the shares and cash issued to him shall be based upon the
last price or closing price of the Corporation's stock on the day before the
date of issuance and/or payment as reported in the Midwest Edition of The Wall
Street Journal or such other source as the Committee shall determine is
representative of the market price (or in the event the shares of the
Corporation are listed on any exchange, based upon the closing price on the
day before the date of issuance); provided, however, that if the Participant's
employment shall have been terminated by the Corporation prior to the
expiration of said five year period and the Board of Directors shall determine
that his interest in the Plan to the extent awarded during the five years
prior to such termination or any portion thereof shall continue, then and in
that event, he shall receive all or such portion of the awards previously made
to him at such time and in such amounts as the Board of Directors may in its
absolute discretion determine; provided further, that the Committee may reduce
the amount of cash payable to the CEO and/or COO under a Tax Offset Bonus Unit
if the Committee determines that such reduction is appropriate in light of the
marginal Federal income tax rate in effect at the time such cash is to be
paid.

    (b)      When some or all of the shareholders of the Corporation receive 
stock pursuant to a transaction resulting in a change of control, that new stock
shall be issued to the Participant in lieu of the Corporation's stock which
would have otherwise been issued under this Paragraph 6 and in the same ratio
as received by the Corporation's other shareholders for their shares.

    (c)      "Change in control", as used in this Paragraph 6, shall be deemed 
to have occurred if any individual, corporation, partnership or other person or
entity, together with its Affiliates and Associates, acquires as the
Beneficial Owner more than thirty-five percent (35%) in the aggregate of the
outstanding shares of the Corporation entitled to vote in the election of
Directors, and within a 400-day period thereafter a majority of Directors
elected to the Board, or a majority of the persons constituting a group
authorized to hire or terminate employment of officers, if other than the
Board, are different from the Directors or persons constituting the Board or
group just prior to the start of such period or a group other than the Board
is created to hire or terminate employment of officers.  The term "Affiliate,"
"Associate" and "Beneficial Owner" as used in this subparagraph (c) shall be
defined by reference to the Securities Exchange Act of 1934 and rules in
effect thereunder as of the date of the amendment of this Paragraph 6.

7.  Forfeiture

In the event of the Participant's termination of employment with the
Corporation and its subsidiaries for any reason other than death, permanent
and total disability or retirement after the age of 65, any rights under this
Plan, except shares and cash theretofore issued and paid or required to have
been issued and paid, shall be forfeited, except as otherwise determined by
the Board of Directors as provided in 6, above.

8.  Nature of Rights

The Incentive Stock Bonus Units and Tax Offset Bonus Units shall be used
solely as a device for measurement and determination of the amount of shares
and cash to be issued and paid to Participants as provided in the Plan.  The
Incentive Stock Bonus Units and Tax Offset Bonus Units shall not constitute
nor be treated as property or as a trust fund of any kind.  All amounts at any
time attributable to the Incentive Stock Bonus Units and Tax Offset Bonus
Units shall be treated as property of the Corporation and the Participant's
rights hereunder are limited to the rights to receive cash and shares of
common stock of the Corporation as herein provided.  The award of Incentive
Stock Bonus Units and Tax Offset Bonus Units shall not entitle Participants to
any rights as shareholders but only such rights as are specified in the Plan.

9.  Securities Act of 1933

Upon issuance of common stock of the Corporation to the Participant (or the
personal representative or heirs of a deceased Participant) the recipient of
such stock shall represent that the shares of stock are taken for investment
and not resale and make such other representations as may be necessary to
qualify the issuance of the shares as exempt from the Securities Act of 1933
or to permit registration of the shares and shall represent that the recipient
shall not dispose of such shares in violation of the Securities Act of 1933. 
The Corporation reserves the right to place a legend on any stock certificate
issued pursuant to the Plan to assure compliance with this Paragraph 9.  No
shares of common stock of the Corporation shall be required to be distributed
until the Corporation shall have taken such action, if any, as is then
required to comply with the provisions of the Securities Act of 1933 or any
other then applicable securities law.

10.  Maximum Shares Issued

The aggregate number of shares of common stock of the Corporation which may be
issued under the Plan shall not exceed 1,200,000.  The initial number of
shares authorized under the Plan in 1978 was 100,000.  Giving effect to stock
splits since the Plan's inception, the number of shares covered by the Plan is
1,200,000 as of the effective date of this Third Amendment and Restatement. 
Prior to 1996, 374,145 units have been awarded, leaving a balance of 825,855
units.  On and after the effective date of this Amendment, a person may be
awarded under this Plan up to a maximum of 400,000 Incentive Stock Bonus Units
(and an equal number of Tax Offset Bonus Units).  The Corporation shall, from
time to time, purchase its own shares on the open market for treasury shares
in such amounts as may be necessary for the purpose of carrying out the terms
of this Plan; provided, however, upon a two-thirds (2/3) affirmative vote of
the Board, the Corporation may issue its unissued shares of common stock in
lieu of such treasury shares.

11.  Withholding of Tax

There shall be deducted from any compensation due any Participant under the
Plan, whether in the form of cash or stock distribution, cash in the amount of
any tax required by any governmental authority to be withheld and paid over by
the Corporation to such governmental authority for the account of the person
entitled to such distribution.

12.  Effective Date

This Amendment shall become effective for the year 1996; provided, however,
that no Participant shall be entitled to any distribution of shares or cash
thereunder unless and until this Third Amendment shall have been ratified by
the affirmative vote of the holders of a majority of the shares of common
stock of the Corporation represented at any meeting thereof at which a quorum
is present.

13.  Dilution

In the event of a stock split, stock dividend, reclassification,
reorganization or other capital adjustment of shares of common stock of the
Corporation, the number of Incentive Stock Bonus Units and Tax Offset Bonus
Units of a Participant shall be adjusted in the same manner as shares of the
Corporation's common stock reflected by such Incentive Stock Bonus Unit or Tax
Offset Bonus Unit would be adjusted.

14.  Transferability

Any rights arising under the Plan shall not be transferable otherwise than by
will or the laws of descent and distribution.

15.  Termination, Amendment or Extension of Plan

Unless the Plan or authority of the Committee has been discontinued by the
Board as provided in Paragraph 5 above, the Committee may, but need not, make
awards under the Plan so long as the maximum number of shares authorized in
Paragraph 10 shall not have been reserved and/or awarded.  The Committee may
modify the Plan at any time; provided, however, that (a) such modification
shall not materially change the Corporation's obligations under the Plan
unless approved by the Board; (b) such modification shall not reduce the
benefits to which any Participant would be entitled under awards previously
made without his consent in writing; and (c) in the event any modification
shall increase the aggregate maximum number of shares to be issued under the
Plan beyond those authorized in Paragraph 10 or shall change the manner in
which the maximum amount of the Bonus Pool for any given year is determined
under Paragraph 3 or the class of employees eligible to participate as
provided in Section 2(d), such amendment shall be subject to ratification by
the affirmative vote of the shareholders in the same manner as provided in
Paragraph 12 hereof with respect to the original ratification of the Plan.




(Page 11 of 1996 Annual Report to Shareholders)

SELECTED FINANCIAL DATA (UNAUDITED)
(PER SHARE DATA RESTATED FOR TWO-FOR-ONE STOCK SPLIT)

<TABLE>
<CAPTION>
COMMON STOCK DATA:
(per share)   

                                         Price Range
                        --------------------------------------------
                               1996                     1995                    Dividends
                        -------------------     --------------------     --------------------
                         High         Low        High          Low          1996        1995
                        -------     -------     -------      -------      -------     -------
<S>                     <C>         <C>         <C>          <C>          <C>         <C>      
First Quarter           $30-1/8     $24-5/8     $21-1/4      $16-1/4      $.0550      $.0450
Second Quarter           30          25-1/8      24-3/4       19-1/8       .0550       .0450
Third Quarter            28-3/4      23-3/4      25-7/8       23-3/8       .0550       .0450
Fourth Quarter           32-1/16     28          25-1/4       22-1/8       .0625       .0550
</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 FINACIAL DATA:
(in millions, except per share data)
                                                           1996       1995      1994      1993      1992
                                                         --------   --------  --------  --------  --------              
<S>                                                      <C>         <C>       <C>       <C>       <C>
Net sales                                                $1,034.6    $959.8    $851.2    $739.4    $654.4
Income before cumulative effect of accounting changes       147.9     131.7     110.3     107.1      95.5
Net income                                                  147.9     131.7     110.3      96.3      95.5
Per share:
     Income before cumulative effect of accounting changes   1.48      1.32      1.11      1.08       .96
     Net income                                              1.48      1.32      1.11       .97       .96
     Dividends                                              .2275     .1900     .1688     .1500     .1300
Total assets                                              1,100.0     985.2     852.0     753.4     615.8
Long-term debt                                               13.1      13.8      14.5      17.3      18.7
</TABLE>

Note - In 1993, the Company acquired the net assets and business of Supelco,
       Inc. and all of the stock of Circle AW Products Company.

<TABLE>
<CAPTION>
QUARTERLY FINANCIAL DATA:
(in millions, except per share data)
                                                 1996 QUARTER ENDED
                                  --------------------------------------------
                                  March 31     June 30    Sept. 30     Dec. 31
                                  --------     -------    --------     -------
<S>                               <C>          <C>        <C>          <C>
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                   .37         .37         .37         .37


                                                 1995 QUARTER ENDED
                                  --------------------------------------------
                                  March 31    June 30     Sept. 30     Dec. 31
                                  --------    -------     --------     -------
Net sales                           $244.8     $243.3       $239.1      $232.6
Gross profit                         130.0      128.9        126.7       126.3
Net income                            32.7       33.5         33.2        32.3
Net income per share                   .33        .34          .33         .32
</TABLE>

(Pages 12-13 of 1996 Annual Report to Shareholders)

MANAGEMENT'S DISCUSSION OF FINANCIAL
CONDITION AND RESULTS OF OPERATIONS

Results of Operations
- ---------------------

During the three years ended December 31, 1996, the Company's sales and earnings
continued to grow.

Chemical sales increased 7.4%, 13.0%, and 11.9% for 1996, 1995 and 1994, 
respectively. This sales growth is attributed to selective price increases, 
the annual addition of new products and the opening of new international 
sales offices. Price increases for products listed in the general
chemical catalogs averaged 4.5% in 1996 and 1995 and 5.0% in 1994. New product
sales, while not material in the year introduced, contribute to sales growth 
in subsequent years. The effect of translating foreign currency sales into 
the U.S. dollar reduced the 1996 sales growth by 1.3%, contributed 3.5% of 
the 1995 sales growth and had only a slightly positive impact on 1994 sales
growth. Chemical sales for 1996 and 1995 also benefited from aggressive 
marketing and closer customer contacts, partially offsetting the effect of 
reduced growth in research funding in all major markets. Sales gains for 1994
reflect a benefit from the acquisition of Supelco in May 1993. Emphasis on 
international markets and new sales offices helped achieve growth in
international direct sales of 14% in 1996, 18% in 1995 and 16% in 1994, after
eliminating the effect of changes in currency exchange rates. The increase in
direct international sales is partially offset by a slowing in the growth of
export sales from the United States. A 1% decrease in export sales in 1996, 
following increases in export sales of 2% and 5% in 1995 and 1994 respectively,
reflect the continuing transfer of sales to both our existing and new 
international offices, together with the impact of the stronger U.S. dollar 
in 1996.

Metal sales increased 9.6%, 11.6%, and 30.4% for 1996, 1995 and 1994, 
respectively. Average selling prices decreased 2% in 1996 after increasing 6% 
in 1995 and 2% in 1994, all in response to changes in raw material costs. 
Excluding the effect of price changes in the two most recent years, the growth 
rate in 1996 improved, due in part to the addition of electronic enclosures to
the product line. Slower growth in 1995 resulted from slower construction 
demand. The higher growth rate in 1994 was due to increased volume from 
stronger construction demand and the acquisition of Circle AW in June of 
1993, which provided one-third of the 1994 gain.

Cost of products sold was 46.0%, 46.7%, and 47.6% of sales in 1996, 1995 and 
1994, respectively. The continuing improvement is due to increased utilization
of new facilities, productivity gains, a higher proportion of sales of 
manufactured chemical products, product mix changes and, in 1995 and 1994, 
higher selling prices for metal products. Price decreases for metal products 
in 1996 partially offset the positive effect of the improvements. The cost of
chemical products sold increased by 5.0% and the cost of metal products sold
increased by 10.8% in 1996, compared to sales increases of 7.4% and 9.6%,
respectively. 

Selling, general and administrative expenses were 31.8%, 32.1%, and 32.4% of
sales in 1996, 1995 and 1994, respectively. The decrease in 1996 and 1995
reflects ongoing efforts to effectively manage staffing levels and control
other significant operating expenses. Additionally, in 1996, net interest 
income increased pretax earnings by $6.3 million over 1995, reflecting
higher average cash balances. Net interest costs declined in 1995 by $1.5 
million, due to a substantial increase in cash and temporary cash investments
provided by operations and a reduced level of capital expenditures. In 1995,
the control of significant operating expenses and decline in net interest costs
were partially offset by an increase in deferred compensation expense
from a credit of $1.8 million in 1994 to an expense of $4.1 million in 1995.
The expense in 1995 was due to improved operating results and increases in 
the Company's stock price compared to the omission of deferred compensation
awards for 1994 due to lower earnings growth and a decline in the market price
of the stock in 1994.

Management expects future sales growth from the continuing introduction of 
new products, more effective distribution of catalogs and added promotional
and marketing programs, the continuing expansion of a sales and marketing 
unit to actively promote sales of research chemicals, and the extension of
our new coagulation programs into Europe. Additionally, 1997 sales will 
benefit from new sales offices.

Liquidity and Capital Resources
- -------------------------------

In 1996, cash and temporary cash investments increased $19.7 million while
short-term borrowings were reduced by $4.7 million. At December 31, 1996, 
there were no borrowings outstanding under the Company's credit arrangements,
which provide for borrowing up to $100 million. In 1995, cash and temporary
cash investments increased by $74.2 million while short-term borrowings were
reduced by $11.4 million.

Cash provided by operating activities was $153.4 million in 1996, a decrease of
$7.8 million from 1995. The change resulted mainly from a $16.2 million 
increase in net income in 1996 offset by an increase in accounts receivable 
and inventories of $42.1 million in 1996 compared to $22.2 million in 1995. 
The increase in receivables is due primarily to the stronger sales growth in
the fourth quarter of 1996. Inventory has grown at a lower rate than sales and
the Company continues to improve its management of this asset through utilizing
better forecasting methods.  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 1997 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 1996, a total of $93.9 million was invested, with significant 
expenditures made in support of distribution and production expansions in the 
U.S., UK, Israel and Switzerland.

During 1997, we expect capital investments of between $90 to $110 million for
distribution, warehousing and production, both domestically and internationally.
Projects for increased production capacity should be completed and begin 
operation in the U.S. and UK. Distribution projects should be completed in the 
U.S. The Company has not made any other significant commitments for, or 
acquisitions of, capital facilities early in 1997.

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 12-13 depicting the following data)
<TABLE>

                                           1996         1995          1994
                                          ------       ------        ------
<S>                                       <C>          <C>           <C>
Chemical Sales (millions of dollars)      $832.9       $775.8        $686.3

Metal Sales (millions of dollars)          201.7        184.0         164.9

Cost of Products Sold (percent of sales)   46.0%        46.7%         47.6%

Selling, General and Administrative
    Expenses (percent of sales)            31.8%        32.1%         32.4%

Capital Expenditures (millions of dollars) $93.9        $60.2         $72.5
</TABLE>

(Page 14 of 1996 Annual Report to Shareholders)
<TABLE>
<CAPTION>

CONSOLIDATED STATEMENTS OF INCOME
(IN THOUSANDS, EXCEPT PER SHARE DATA)

                                                     Years Ended December 31,
                                                --------------------------------
                                                   1996        1995       1994
                                                ----------   --------   --------
<S>                                             <C>          <C>        <C>
Net sales                                       $1,034,565   $959,822   $851,190
Cost of products sold                              476,120    447,898    405,110
                                                ----------   --------   --------
Gross profit                                       558,445    511,924    446,080
Selling, general and administrative expenses       328,761    307,764    275,771
                                                ----------   --------   --------
Income before provision for income taxes           229,684    204,160    170,309
Provision for income taxes                          81,828     72,477     59,969
                                                ----------   --------   --------
Net income                                      $  147,856   $131,683   $110,340
                                                ==========   ========   ========
Weighted average number of shares outstanding       99,930     99,714     99,658
                                                ==========   ========   ========
Net income per share                                 $1.48      $1.32      $1.11
                                                ==========   ========   ========
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, 1996 and 1995, and the related consolidated statements of income,
stockholder's equity and cash flows for each of the three years in the period
ended December 31, 1996. 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, 1996 and 1995, and the results of their 
operations and their cash flows for each of the three years in the period 
ended December 31, 1996, in conformity with generally accepted accounting 
principles.

/s/  ARTHUR ANDERSEN LLP

ARTHUR ANDERSEN LLP

St. Louis, Missouri,
February 14, 1997

(Page 15 of the 1996 Annual Report to Shareholders)

<TABLE>
<CAPTION>

CONSOLIDATED BALANCE SHEETS
(IN THOUSANDS)

                                                          December 31,
                                                    ------------------------
                                                       1996          1995
                                                    ----------      --------
<S>                                                 <C>             <C>
ASSETS
Current assets:
   Cash and temporary cash investments                $103,685       $83,969
   Accounts receivable, less allowance for doubtful
    accounts of $7,338 and $8,838, respectively        165,511       144,661
   Inventories                                         362,784       346,388
   Other current assets                                 34,657        34,983
                                                    ----------      --------
    Total current assets                               666,637       610,001
                                                    ----------      --------
Property, plant and equipment:

   Land                                                 32,276        29,365
   Buildings and improvements                          233,684       211,805
   Machinery and equipment                             338,531       301,314
   Construction in progress                             54,927        30,086
   Less - Accumulated depreciation                    (280,323)     (244,649)
                                                    ----------      --------
    Net property, plant and equipment                  379,095       327,921
                                                    ----------      --------
Other assets                                            54,226        47,266
                                                    ----------      --------
                                                    $1,099,958      $985,188
LIABILITIES AND STOCKHOLDERS' EQUITY                ==========     =========
Current liabilities:
   Notes payable                                        $2,615       $7,306
   Current maturities of long-term debt                  9,454          459
   Accounts payable                                     60,881       57,087
   Accrued payroll and payroll taxes                    11,571        8,909
   Other accrued expenses                               16,689       25,153
   Accrued income taxes                                  9,107        9,097
                                                    ----------     --------
    Total current liabilities                          110,317      108,011
                                                    ----------     --------
Long-term debt                                           3,787       13,834
                                                    ----------     --------
Deferred postretirement benefits                        32,918       29,910
                                                    ----------     --------
Deferred compensation                                   10,662        8,699
                                                    ----------     --------
Stockholders' equity:
   Common stock                                        100,044       49,877
   Capital in excess of par value                       17,002       11,455
   Retained earnings                                   819,467      744,370
   Cumulative translation adjustments                    5,761       19,032
                                                    ----------     --------
    Total stockholders' equity                         942,274      824,734
                                                    ----------     --------
                                                    $1,099,958     $985,188
                                                    ==========     ========

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

(Page 16 of the 1996 Annual Report to Shareholders)
<TABLE>
<CAPTION>

CONSOLIDATED STATEMENT OF STOCKHOLDERS'
EQUITY (IN THOUSANDS, EXCEPT PER SHARE DATA)

                                           Common Stock
                                     200,000 Shares Authorized
                                            ($1.00 Par)
                                         ------------------    Capital in                Cumulative
                                                               Excess of     Retained    Translation
                                         Shares      Amount    Par Value     Earnings    Adjustments
                                         ------     -------    ---------     --------    -----------
<S>                                      <C>        <C>        <C>           <C>         <C>
Balance, December 31, 1993               49,805     $49,805      $8,883      $538,111      $(5,659)

   Net income                                --          --          --       110,340           --  
   Dividends ($.3375 per share)              --          --          --       (16,817)          --
   Awards under deferred
     compensation plan                       19          19         898            --           --
   Exercise of stock options                  8           8         223            --           --
   Translation adjustment                    --          --          --            --       13,694
                                       --------    --------    --------      --------     --------          
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
                                       ========   =========    =========    =========     =========

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 17 of 1996 Annual Report to Shareholders)
<TABLE>
<CAPTION>

CONSOLIDATED STATEMENTS OF CASH FLOWS
(IN THOUSANDS)

                                                                   Years Ended December 31,
                                                              --------------------------------
                                                                1996         1995       1994
                                                              --------     --------   --------
<S>                                                           <C>          <C>        <C>
Cash flows from operating activities:
  Net income                                                  $147,856     $131,683   $110,340  
  Adjustments to reconcile net income to net cash
   provided by operating activities:
    Depreciation and amortization                               45,213       40,872     36,655    
    Deferred income taxes                                        1,918        1,037       (613)     
    Postretirement benefits expense                              3,739        3,584      3,547     
    Deferred compensation expense (credit)                       2,762        4,111     (1,757)   
    Deferred compensation payments                                (407)        (526)      (740)     
    Increase in accounts receivable                            (22,726)      (8,910)   (18,592)  
    Increase in inventories                                    (19,361)     (13,328)   (20,090)  
    Increase in other current assets                            (1,297)      (7,384)    (5,222)   
    Increase in accounts payable                                 2,847        1,182      6,883     
    Increase (decrease) in accrued payroll and payroll taxes     2,435       (1,212)       276  
    Increase (decrease) in other accrued expenses               (8,904)       6,562        124  
    Increase (decrease) in accrued income taxes                   (655)       3,584       (799)     
                                                              --------     --------   --------
     Net cash provided by operating activities                 153,420      161,255    110,012   
                                                              --------     --------   --------
Cash flows from investing activities:
  Property, plant and equipment additions                      (93,888)     (60,224)   (72,494)  
  Sale of equipment                                              1,228        2,096      1,203     
  Acquisition of businesses, net of cash acquired              (13,629)          --         --
  Other, net                                                    (1,500)          --     (3,872)   
                                                              --------     --------   --------
     Net cash used in investing activities                    (107,789)     (58,128)   (75,163)  
                                                              --------     --------   --------
Cash flows from financing activities:
  Repayment of notes payable                                    (4,419)     (10,850)   (18,032)  
  Repayment of long-term debt                                   (1,036)      (1,236)    (3,245)   
  Payment of dividends                                         (22,738)     (18,947)   (16,817)  
  Exercise of employee stock options                             5,301          914        231  
                                                              --------     --------   --------
     Net cash used in financing activities                     (22,892)     (30,119)   (37,863)  
                                                              --------     --------   --------
Effect of exchange rate changes on cash                         (3,023)       1,216      2,507
                                                              --------     --------   --------     
Net change in cash and cash equivalents                         19,716       74,224       (507)     

Cash and cash equivalents at beginning of year                  83,969        9,745     10,252
                                                              --------     --------   --------   
Cash and cash equivalents at end of year                      $103,685      $83,969     $9,745   
                                                              ========     ========   ======== 
Supplemental disclosures of cash flow information:
  Income taxes paid                                            $81,802      $68,187    $61,349   
  Interest paid, net of capitalized interest                     1,390        1,922      3,622     

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

(Pages 18-24 of 1996 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.

Net Income Per Share:
Net income per share is based on the weighted average number of shares 
outstanding during each period after giving retroactive effect to the 
stock split described in Note 9 - Common Stock.

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,
                   --------------------
                     1996        1995
                   --------    --------
Finished goods     $288,293    $279,178
Work in process      22,132      20,382
Raw materials        52,359      46,828
                   --------    --------
Total              $362,784    $346,388
                   ========    ========

Chemical products are valued at the lower of cost or market. Costs for certain 
domestic chemical inventories (23% 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 $6,538,000, $8,062,000, $7,410,000, and 
$7,327,000 higher than reported at December 31, 1996, 1995, 1994 and 
1993, 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 1997, with 
two other facilities of $15,000,000 each expiring in June 1997, 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
1997, the other in June 1998. 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 arrangements at December 
31, 1996 or 1995 or under the multi-currency facility at December 31, 1996. 
Borrowings of $4,934,000 under the multi-currency commitments were
outstanding at December 31, 1995, with an average interest rate of 4.7%. 
The Company intends to renew all of these facilities before they expire.

Notes payable by international subsidiaries were $2,615,000 and $2,372,000 
at December 31, 1996 and 1995, respectively, and are payable in local 
currencies with weighted average interest rates of 8.3% and 3.1% at 
December 31, 1996 and 1995, respectively. 

NOTE 4 - Long-Term Debt
Long-term debt consists of the following (in thousands):

                                  December 31,
                               -----------------
                                1996        1995
                               ------      ------
6.0% Industrial Revenue Bonds
due April 1, 2010              $5,775      $5,775

5.875% Industrial Revenue Bonds
due July 1, 2004                3,550       3,550

7.0% Industrial Revenue Bonds
due Nov. 1, 2014                2,700       2,700
Other                           1,216       2,268
                               ------      ------
                               13,241      14,293

Less-Current
maturities                     (9,454)       (459)
                              -------     -------
                               $3,787     $13,834
                              =======     =======

Both the 6.0% and 5.875% Industrial Revenue Bonds are subject to optional 
redemption by the Company in 1997. If the bonds are not redeemed by the 
Company, the interest rate will be adjusted and a new interest rate 
calculation period will be determined. At that time, the bondholders have 
the option of continuing to hold the bonds or redeeming them at par value.
Holders of the 6.0% bonds have been notified that the new interest rate is
4.5%. The Company does not intend to reissue any of the 6.0% or 5.875% 
bonds that are redeemed by the current holders and accordingly, the amount 
outstanding is included in current maturities. 

Holders of the 5.875% bonds will be notified of the new rate in May, 1997. 
The 7.0% Industrial Revenue Bonds are subject to optional semi-annual 
redemption at par value by the Company until November 1, 1999.  

Total interest expense incurred by the Company, net of immaterial amounts 
capitalized, was $1,824,000, $1,647,000 and $2,910,000 in 1996, 1995 and 
1994, 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, German mark, French franc and Swiss franc). 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, 1996 and 1995 was $159.1 million and $130.9 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's subsidiaries lease manufacturing and warehouse facilities 
and computer equipment under non-cancelable leases expiring at various 
dates through 2022. Rent charged to operations was $8,676,000, $8,322,000, 
and $9,875,000 in 1996, 1995 and 1994, respectively.  Minimum rental 
commitments for non-cancelable leases in effect at December 31, 1996, are as
follows (in thousands):
                         1997        $9,001
                         1998         7,161
                         1999         3,419
                         2000         1,492
                         2001         1,090
                         2002-2022    1,767

NOTE 7 - Income Taxes

The provision for income taxes consists of the following (in thousands):

                                          1996        1995        1994
                                         -------     -------     -------
Current:
  Federal                                $58,376     $55,721     $50,089
  State                                    6,609       6,399       5,882
  International                           14,925       9,320       4,611
                                          ------      ------      ------
     Total current                        79,910      71,440      60,582
                                          ------      ------      ------
Deferred:
  Federal                                  1,833        (394)     (1,946) 
  State                                      482         (74)       (293)
  International                             (397)      1,505       1,626
                                         -------     -------     -------
     Total deferred                        1,918       1,037        (613) 
                                         -------     -------     -------
Total provision for income taxes         $81,828     $72,477     $59,969
                                         =======     =======     =======

A reconciliation of statutory and effective tax rates is as follows:

                                            1996        1995       1994
                                            ----        ----       ----
Statutory tax rate                          35.0%       35.0%      35.0%
FSC benefits                                (1.4)       (1.7)      (1.5)
State income taxes,
  net of federal benefits                    1.9         2.0        2.1
International taxes                           .2         (.5)        .3
Other, net                                   (.1)         .7        (.7)
                                           -----       -----      -----
                                            35.6%       35.5%      35.2%
                                           =====       =====      =====

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 assets at December 31, which are included in other 
assets on the consolidated balance sheets, result from the following 
temporary differences (in thousands):

                                1996        1995
                              -------     -------
Gross deferred assets:
Inventories                   $18,367     $16,668
Pension and postretirement
  benefit plans                13,794      13,320
                              -------     -------
Total                          32,161      29,988
                              -------     -------
Gross deferred liabilities:

Depreciation                  (19,867)    (20,432)
Other                         (10,512)     (5,856)
                              -------     -------
Total                         (30,379)    (26,288)
                              -------     -------
Net deferred tax assets        $1,782      $3,700
                              =======     =======

At December 31, 1996 and 1995, 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 $127,514,000 at December 31, 1996) 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 1996. 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 1996, 1995 and 1994, 57,900, 35,800, and 37,400 shares of 
common stock, respectively, were issued under this plan. At December 
31, 1996, 148,200 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 1,593,810 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 1996 to purchase 
249,000 shares become exercisable over a one to five year period. Options 
granted in 1995 to purchase 22,000 shares become exercisable over a one to 
two year period. Options to purchase 2,984,000 shares of the Company's 
common stock under this plan remain to be granted at December 31, 1996.

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. No 
further options will be issued under the Share Option Plan of 1987 and 
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 1996 and 1995 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):


                        1996         1995
                      --------     --------
Net income            $141,562     $131,290
Net income per share     $1.42        $1.32


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 used for grants in 1996 and 1995: 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, 1996, 1995 and 1994 and 
changes during the years ended on those dates is as follows:

<TABLE>
                                            1996                      1995                    1994
                                  ----------------------    ---------------------   ---------------------
                                               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               1,736,376     $21.31     1,809,980     $21.22     1,073,580     $23.97
Options granted                     984,000      25.69        42,000      22.15       838,000      18.15
Options exercised                  (279,740)     19.41       (54,700)     16.71       (17,600)     15.43
Options cancelled                   (44,000)     21.83       (60,904)     23.13       (84,000)     26.77
                                  ---------                ---------                ---------
Options outstanding,
  end of year                     2,396,636      23.43     1,736,376      21.31     1,809,980      21.22
                                  =========                =========                =========
Options exercisable at year-end   1,419,436      21.70     1,692,176      21.29       969,780      23.87

Weighted average fair value of
  options granted during the year     $8.02                    $6.85
</TABLE>

The following table summarizes information about stock options outstanding at
December 31, 1996:
<TABLE>

                                            Options Outstanding                        Options Exercisable
                              ---------------------------------------------        --------------------------
                                Number            Wtd. Avg.        Wtd. Avg.         Number          Wtd. Avg.
                              Outstanding         Remaining        Exercise        Exercisable       Exercise
Range of Exercise Prices      at 12/31/96      Contractual Life      Price         at 12/31/96         Price
- ------------------------      -----------      ----------------     -------        -----------       --------
<S>                           <C>              <C>                  <C>            <C>               <C>
$10.1875 to $14.5625            71,160            19.6 months       $10.65            71,160           $10.65
$16.25 to $24.00               863,180            93.3 months        19.49           863,180            19.49
$24.875 to $31.25            1,462,296            96.0 months        26.36           485,096            27.20
                             ---------                                             ---------
                             2,396,636            90.5 months        23.43         1,419,436            21.70
                             =========                                             =========
</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 22 include 
sales to international markets as follows (in thousands):

         Year      Amount
         ----     --------
         1996     $106,154
         1995      107,255
         1994      104,825



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

<TABLE>
                                                    1996         1995           1994
Net sales to unaffiliated customers:             ----------     --------       --------
<S>                                              <C>            <C>            <C>
   Chemical Products                               $832,924     $775,862       $686,325
   Metal Products                                   201,641      183,960        164,865
                                                 ----------     --------       --------
     Total                                       $1,034,565     $959,822       $851,190
                                                 ==========     ========       ========

Income before provision for income taxes:
   Chemical Products                               $193,075     $177,334      $149,444
   Metal Products                                    31,395       27,916        23,501
   Interest income (expense), net                     5,214       (1,090)       (2,636)
                                                   --------     --------      --------
     Total                                         $229,684     $204,160      $170,309
                                                   ========     ========      ========
Depreciation:
   Chemical Products                                $36,221      $33,312       $29,404
   Metal Products                                     5,007        4,239         4,076
                                                    -------      -------       -------
     Total                                          $41,228      $37,551       $33,480
                                                    =======      =======       =======
Capital expenditures:
   Chemical Products                                $77,541      $45,397       $68,059
   Metal Products                                    16,347       14,827         4,435
                                                    -------      -------       -------
     Total                                          $93,888      $60,224       $72,494
                                                    =======      =======       =======
Identifiable assets at December 31:
   Chemical Products                               $860,676     $789,058      $746,887
   Metal Products                                   135,597      112,161        95,341
   Cash and temporary cash investments              103,685       83,969         9,745
                                                 ----------     --------      --------
     Total                                       $1,099,958     $985,188      $851,973
                                                 ==========     ========      ========
</TABLE>

The Company's operations by geographic segment are as follows (in thousands):
<TABLE>                                        
                                                    1996          1995          1994  
                                                  --------      --------      --------
Net sales to unaffiliated customers:
<S>                                               <C>           <C>           <C>
   United States                                  $683,810      $641,167      $602,573
   International                                   350,755       318,655       248,617

Net intercompany sales between geographic areas:
   United States                                   146,202       125,652        92,752
   International                                    39,268        36,735        32,782
   Eliminations                                   (185,470)     (162,387)     (125,534)  
                                                ----------      --------      --------
     Total                                      $1,034,565      $959,822      $851,190
                                                ==========      ========      ========

Income before provision for income taxes:
   United States                                  $192,415      $172,308      $156,380
   International                                    41,664        36,760        16,803
   Eliminations                                     (4,395)       (4,908)       (2,874)
                                                  --------      --------      --------
     Total                                        $229,684      $204,160      $170,309
                                                  ========      ========      ========

Identifiable assets at December 31:
   United States                                  $783,699      $695,326      $612,721
   International                                   348,732       307,902       256,563
   Eliminations                                    (32,473)      (18,040)      (17,311)
                                                ----------      --------      --------
     Total                                      $1,099,958      $985,188      $851,973
                                                ==========      ========      ========
</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>
                                                          December 31,
                                    --------------------------------------------------------
                                          United States                 International
                                    -------------------------     --------------------------
                                     1996      1995      1994      1996      1995      1994
                                    ------    ------    ------    ------    ------    ------
<S>                                 <C>       <C>       <C>       <C>       <C>       <C>
Service cost                        $2,928    $1,673    $1,669    $2,082    $1,997    $2,336
Interest cost                        3,284     2,391     2,196     2,169     2,123     1,760
Actual return on plan assets        (5,254)   (6,918)      329    (3,247)   (3,508)   (1,422)
Net amortization and deferral        2,908     4,280    (2,515)      358       790      (897)
                                    ------    ------    ------    ------    ------    ------
Net periodic pension cost           $3,866    $1,426    $1,679    $1,362    $1,402    $1,777
                                    ======    ======    ======    ======    ======    ======
</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, 1996, 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>
                                                               December 31,
                                                  -------------------------------------
                                                    United States       International
                                                  ----------------    -----------------
                                                    1996      1995      1996      1995
                                                  -------   -------   -------   -------
<S>                                               <C>       <C>       <C>       <C>
Actuarial present value of benefit obligations:
   Vested                                         $38,796   $37,692   $35,489   $35,445
                                                  =======   =======   =======   =======
   Accumulated                                    $40,829   $39,954   $35,489   $35,445
                                                  =======   =======   =======   =======
   Projected                                      $47,387   $41,396   $44,320   $44,325
Plan assets at fair value                          52,372    41,024    47,353    46,286
                                                  -------   -------   -------   -------
Excess (deficiency) of plan assets over projected
benefit obligations                                 4,985      (372)    3,033     1,961
Unrecognized net (gain) loss                       (2,767)    1,165    (1,346)     (761)
Unrecognized prior service cost                    11,003     6,921     1,649     1,828
Unrecognized net transition asset                    (726)     (817)     (268)     (284)
                                                  -------    ------    ------    ------ 
Prepaid pension cost                              $12,495    $6,897    $3,068    $2,744
                                                  =======    ======    ======    ======
</TABLE>

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

<TABLE>
                                                                  December 31,
                                                      ----------------------------------
                                                      United States        International
                                                      -------------        -------------
                                                       1996    1995        1996    1995
                                                       ----    ----        ----    ----
<S>                                                    <C>     <C>         <C>     <C>
Discount rate in determining benefit obligations       7.5%    7.0%        4.6%    5.1%
Compensation rate increase                             5.5%    5.0%        3.7%    4.3%
Return on plan assets                                  9.0%    8.5%        6.8%    6.6%
</TABLE>

The Company's 401(k) retirement savings plan provides eligible U.S. employees 
with retirement benefits in addition to those provided by the defined benefit 
plan. The plan permits participants to voluntarily contribute 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 $5,504,000, $2,829,000, 
and $2,337,000, for the years ended December 31, 1996, 1995 and 1994, 
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 1996, 1995, and 1994 are 
as follows (in thousands):

                         1996      1995      1994
                        ------    ------    ------
Service cost            $1,544    $1,346    $1,414
Interest cost            2,195     2,238     2,133
                        ------    ------    ------
Net post-retirement
benefit cost            $3,739    $3,584    $3,547
                        ======    ======    ======

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):

                                                       1996      1995
                                                      ------    ------  
Accumulated postretirement benefit obligation:

   Retirees                                           $8,078    $9,320
   Active - fully eligible                             6,471     6,416
   Active - other                                     16,175    18,582
                                                     -------   -------
      Total                                           30,724    34,318
Plan assets at fair value                                 --        --
                                                     -------   -------
Unfunded postretirement benefit obligation            30,724    34,318
Unrecognized net gain (loss)                           3,042    (3,443)
                                                     -------   -------
Accrued postretirement benefit liability              33,766    30,875
Less-Current portion included in 
   other accrued expenses                               (848)     (965)
                                                     -------   ------- 
Deferred postretirement benefits liability           $32,918   $29,910
                                                     =======   =======

Future benefit costs were estimated assuming medical costs increase at a 
9.5% annual rate in 1996 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, 1996 by $2,740,000 and 1996 postretirement
benefit expense by $410,000. The weighted average discount rate used to 
estimate the accumulated postretirement benefit obligation at December 31, 
1996 is 7.5%. Benefits are funded as claims are paid.


                                                 Exhibit 21

                 SIGMA-ALDRICH CORPORATION
                   PRINCIPAL SUBSIDIARIES

Sigma-Aldrich Corporation (Delaware), the Registrant:

  1.  Sigma Chemical Company (Delaware)

     (A)  Sigma Redevelopment Corporation (Missouri)
     (B)  Sigma Second Street Redevelopment Corporation (Missouri)
     (C)  Sigma Israel Chemicals Ltd. (Israel)
     (D)  Sigma-Aldrich Chemie Holding GmbH (Germany)
     (E)  Sigma-Aldrich Chemie GmbH (Germany)
     (F)  Sigma-Aldrich Marketing, Inc. (Missouri)
          
  2.  Aldrich Chemical Company, Inc. (Delaware)
     
     (A)  Sigma-Aldrich N.V./S.A. (Belgium)
     (B)  Sigma Chemie B.V. (The Netherlands)
     (C)  Aldrich-Chemie Verwaltungs GmbH (Germany)
     (D)  Aldrich-Chemie GmbH & Co. K.G. (Germany)
     (E)  Sigma-Aldrich, S.r.l. (Italy)

  3.  B-Line Systems, Inc. (Missouri)

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

  5.  Sigma-Aldrich Foreign Sales Corporation (Barbados)

  6.  Fluka Chemie AG (Switzerland)
     
     (A)  Fluka Chemical Corporation (New Jersey)
     
  7.  Sigma-Aldrich Foreign Holding Company (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 Chemical Representacoes, Ltd. (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)  LabKemi AB (Sweden)
     (K)  Sigma-Aldrich Japan KK (Japan)
     (L)  Sigma-Aldrich Korea, Ltd. (South Korea)
     (M)  Sigma-Aldrich Pte., Ltd. (Singapore)
     (N)  Sigma-Aldrich (Pty.) Ltd. (South Africa)
     (O)  Sigma-Aldrich India (New Delhi and Hyderbad)
     (P)  Inq. F. Heidenreich AS (Norway)
                         
  8.  Supelco, Inc. (Delaware)
               
  9.  Sigma-Aldrich Chimie S.N.C. (France)

     (A)  Sigma-Aldrich Chimie France S.a.r.l. (France)
     
All subsidiaries are directly or indirectly 100% owned.



                     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.




/s/ Arthur Andersen LLP

ARTHUR ANDERSEN LLP

St. Louis, Missouri,
March 28, 1997

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          103685
<SECURITIES>                                         0
<RECEIVABLES>                                   172849
<ALLOWANCES>                                      7338
<INVENTORY>                                     362784
<CURRENT-ASSETS>                                666637
<PP&E>                                          659418
<DEPRECIATION>                                  280323
<TOTAL-ASSETS>                                 1099958
<CURRENT-LIABILITIES>                           110317
<BONDS>                                           3787
<COMMON>                                        100044
                                0
                                          0
<OTHER-SE>                                      842230
<TOTAL-LIABILITY-AND-EQUITY>                   1099958
<SALES>                                        1034565
<TOTAL-REVENUES>                               1034565
<CGS>                                           476120
<TOTAL-COSTS>                                   476120
<OTHER-EXPENSES>                                328761
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                1824
<INCOME-PRETAX>                                 229684
<INCOME-TAX>                                     81828
<INCOME-CONTINUING>                             147856
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    147856
<EPS-PRIMARY>                                     1.48
<EPS-DILUTED>                                     1.48
        

</TABLE>


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