DOW CHEMICAL CO /DE/
SC 14D1/A, 1998-10-05
CHEMICALS & ALLIED PRODUCTS
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                         SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C. 20549

                             -----------------------
   
                                 SCHEDULE 14D-1
                Tender Offer Statement Pursuant to Section 14(d)(1)
                      of the Securities Exchange Act of 1934
                       (Amendment No. 2 - Final Amendment)
                                       and
                                 SCHEDULE 13D
                                (Rule 13d-101)
                   Information to be included in statements filed
                 pursuant to Rule 13d-1(a) and Amendments thereto
                         filed pursuant to Rule 13d-2(a)
                        Under the Securities Act of 1934

                              (Amendment No. 16)
    
                             -----------------------

                               MYCOGEN CORPORATION
                            (Name of Subject Company)

                             THE DOW CHEMICAL COMPANY
                               ROFAN SERVICES INC.
                                CENTEN AG INC.
                               DOW AGROSCIENCES LLC
                                      and
                          AGROSCIENCES ACQUISITION INC.
                                    (Bidder)

                                  COMMON STOCK
                          PAR VALUE $0.001 PER SHARE
        (INCLUDING THE ASSOCIATED PREFERRED STOCK PURCHASE RIGHTS)
                         (Title of Class of Securities)

                                  628452 10 4
                     (CUSIP Number of Class of Securities)

        John Scriven              Jane M. Gootee           Brian G. Taylorson
  Vice President, General        Vice President                President     
   Counsel and Secretary       Rofan Services Inc.            Centen Ag Inc.    
  The Dow Chemical Company       2030 Dow Center            2030 Dow Center     
      2030 Dow Center        Midland, Michigan 48674     Midland, Michigan 48674
  Midland, Michigan 48674         (517) 636-1000              (517) 636-1000    
       (517) 636-1000


                  Louis W. Pribila                    Brian G. Taylorson 
            Vice President, Secretary                     President      
                and General Counsel              AgroSciences Acquisition Inc. 
               Dow AgroSciences LLC                    2030 Dow Center 
               9330 Zionsville Road                Midland, Michigan 48674
            Indianapolis, Indiana 46268                (517) 636-1000
                (317) 337-3000

                                with a copy to:

                                Scott J. Davis
                               James T. Lidbury
                             Mayer, Brown & Platt
                           190 South LaSalle Street
                           Chicago, Illinois 60603
                               (312) 782-0600
           (Name, Address and Telephone Number of Person Authorized
          to Receive Notices and Communications on Behalf of Bidder)
   
                               October 5, 1998
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                                  Page 1 of 5 Pages
    
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CUSIP No.: 628452 10 4                  14D-1
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1.   Name of Reporting Person: The Dow Chemical Company
     S.S. or I.R.S. Identification Nos. of Above Person:  38-1285128

     Name of Reporting Person:  Rofan Services Inc.
     S.S. or I.R.S. Identification Nos. of Above Person:  38-2853855

     Name of Reporting Person: Centen Ag Inc.
     S.S. or I.R.S. Identification Nos. of Above Person:  38-3355904

     Name of Reporting Person:  Dow AgroSciences LLC
     S.S. or I.R.S. Identification Nos. of Above Person:  35-1781118

     Name of Reporting Person: AgroSciences Acquisition Inc.
     S.S. or I.R.S. Identification Nos. of Above Person:  38-3409607

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2.   Check the Appropriate Box if a Member of a Group:                (a)  / /
                                                                      (b)  / /
                                                              
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3.   SEC Use Only:
                                                                  
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4.   Sources of Funds:  WC
                                                                  
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5.   Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(e)
     or 2(f):                                                              / /
                                                                             
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6.   Citizenship or Place of Organization: Delaware 

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Number of Shares              (7) Sole Voting Power
 Beneficially Owned                 0
 by Each Reporting           --------------------------------------------------
 Person                       (8) Shared Voting Power
                                    39,438,813 (except Centen Ag Inc. which
                                                 beneficially owns no shares)
                             --------------------------------------------------
                              (9) Sole Dispositive Power
                                    0
                             --------------------------------------------------
                             (10) Shared Dispositive Power
                                    39,438,813 (except Centen Ag Inc. which
                                                 beneficially owns no shares)
    
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11.  Aggregate Amount Beneficially Owned by Each Reporting Person:    
     Shares (except Centen Ag Inc. which beneficially owns no shares)
    
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12.  Check if the Aggregate in Row (11) Excludes Certain Shares:           / /
    
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13.  Percent of Class Represented by Amount in Row (11):     99.31%
    
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14.  Type of Reporting Person:     CO (The Dow Chemical Company)
                                   CO (Rofan Services Inc.)
                                   CO (Centen Ag Inc.) 
                                   OO (Dow AgroSciences LLC)
                                   CO (AgroSciences Acquisition Inc.)
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                              Page 2 of 5
    

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     This Amendment No. 2 (this "Amendment") amends and supplements the Tender
Offer Statement on Schedule 14D-1 filed with the Securities and Exchange
Commission on September 4, 1998 (as amended from time to time, the "Schedule
14D-1") by AgroSciences Acquisition Inc. ("Purchaser"), The Dow Chemical Company
("TDCC"), Rofan Services Inc. ("Rofan"), Centen Ag Inc. and Dow AgroSciences LLC
("Parent").  The Schedule 14D-1 and this Amendment relate to a tender offer by
Purchaser for all outstanding shares of common stock, par value $0.001 per share
(including the associated preferred stock purchase rights) (the "Shares"), of
Mycogen Corporation (the "Company"), upon the terms and subject to the
conditions set forth in the Offer to Purchase dated September 4, 1998 (the
"Offer to Purchase") and the related Letter of Transmittal (which together
constitute the "Offer"), copies of which are filed as Exhibits 99(a)(1) and
99(a)(2), respectively, to the Schedule 14D-1.  

     This Amendment is also Amendment No. 16 to Schedule 13D of TDCC, Rofan and
Parent.


SCHEDULE 13D,       ITEM 4.  PURPOSE OF TRANSACTION.
SCHEDULE 14D-1,     ITEM 5.  PURPOSE OF THE TENDER OFFER AND PLANS OR
                    PROPOSALS OF THE BIDDER.

     The foregoing items are supplemented as follows:

     The Offer expired at 12:00 midnight, New York City time, on October 2,
1988.  On October 5, 1998, Purchaser accepted for payment at the Offer Price all
of the 14,672,656 Shares validly tendered and not previously withdrawn in
response to the Offer.  As a result, Purchaser is the beneficial owner of
99.31% of the outstanding Shares and Purchaser intends to effect on or about
October 30, 1998 the short form merger of Purchaser with and into the Company.

                                  Page 3 of 5
    

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SCHEDULE 13D,       ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.
SCHEDULE 14D-1,     ITEM 6.  INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

     As a result of purchases pursuant to the Offer, the foregoing items are
amended as follows: 

<TABLE>
<CAPTION>

                                 Shares
                              Beneficially             Percentage
     Name                        Owned                  of Class
     ----                     ------------             ----------
    <S>                          <C>                     <C>
     The Dow Chemical Company   39,438,813                99.31%
     2030 Dow Center
     Midland, MI 48674
     (517) 636-1000

     Rofan Services, Inc.       39,438,813                99.31%
     2030 Dow Center
     Midland, MI 48674
     (517) 636-1000

     Centen Ag Inc.                 0                       0%
     2030 Dow Center
     Midland, MI 48674
     (517) 636-1000
     
     Dow AgroSciences LLC       39,438,813                99.31%
     9330 Zionsville Road
     Indianapolis, IN 46268
     (317) 337-3000

     AgroSciences Acquisition Inc.
     2030 Dow Center            39,438,813                99.31%
     Midland, MI 48674
     (517) 636-1000
</TABLE>

     AgroSciences Acquisition Inc. is the record owner of all 39,438,813 
shares reported herein. As a result of their direct and/or indirect ownership 
of AgroSciences Acquisition Inc., The Dow Chemical Company, Rofan Services, 
Inc. and Dow AgroSciences LLC may be deemed to beneficially own all of the 
shares owned of record by AgroSciences Acquisition Inc.


SCHEDULE 13D,       ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.
SCHEDULE 14D-1,     ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.

     Exhibit No. 99(a)(11) Press release issued by TDCC and Parent on 
October 5, 1998.

     Exhibit No. 99(a)(12) Joint Filing Agreement.

                                  Page 4 of 5
    
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                               SIGNATURES


          After due inquiry and to the best of my knowledge and belief, I 
certify that the information set forth in this statement is true, complete 
and correct.
   
Dated:  October 5, 1998.      THE DOW CHEMICAL COMPANY
    

                              By:    /s/ G. MICHAEL LYNCH
                                 --------------------------------------
                              Name:  G. Michael Lynch
                              Title: Vice President and Controller


                              ROFAN SERVICES INC.

          
                              By:    /s/ J. PEDRO REINHARD
                                 --------------------------------------
                              Name:  J. Pedro Reinhard
                              Title: President      


                              CENTEN AG INC.

          
                              By:    /s/ BRIAN G. TAYLORSON
                                 --------------------------------------
                              Name:  Brian G. Taylorson
                              Title: President


                              DOW AGROSCIENCES LLC


                              By:    /s/ LOUIS W. PRIBILA
                                 --------------------------------------
                              Name:  Louis W. Pribila
                              Title: Vice President, Secretary and General 
                                     Counsel


                              AGROSCIENCES ACQUISITION INC.


                              By:  /s/ BRIAN G. TAYLORSON
                                 --------------------------------------
                              Name:  Brian G. Taylorson
                              Title: President
   
                                  Page 5 of 5
    

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                                                      EXHIBIT 99(a)(11)


                                             FOR IMMEDIATE RELEASE:


         DOW AGROSCIENCES SUBSIDIARY PURCHASES MYCOGEN SHARES IN TENDER OFFER

     MIDLAND, MICHIGAN, October 5, 1998 -- The Dow Chemical Company announced 
today that Dow's wholly-owned subsidiary AgroSciences Acquisition Inc. has 
purchased all shares of common stock of Mycogen Corporation (NASDAQ: "MYCO") 
which were validly tendered in response to its $28.00 per share tender offer. 
 The tender offer expired as scheduled on Friday, October 2, 1998, and was 
not extended.

     Approximately 14.7 million shares of Mycogen common stock were tendered 
in the offer.  These shares, together with the approximately 24.8 million 
shares already owned by Dow AgroSciences, represent approximately 99.3 
percent of Mycogen's outstanding shares on a fully diluted basis.  The 
acceptance of the shares and the processing of the payment begins immediately.

                                        # # #

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                                                             EXHIBIT 99(a)(12)

                            JOINT FILING AGREEMENT
                                       

     In accordance with Rule 13d-1(f) under the Securities Exchange Act of 
1934, as amended, each of the persons named below agrees to the joint filing 
on Schedule 13D (including amendments thereto) with respect to the common 
stock, par value $0.001 per share of Mycogen Corporation, a California 
corporation, and further agrees that this Joint Filing Agreement be included 
as an exhibit to such filings provided that, as contemplated by Section 
13d-1(f)(1)(ii), no person shall be responsible for the completeness or 
accuracy of the information concerning the other persons making such filings, 
unless such person knew or had reason to believe that such information 
is inaccurate. This Joint Filing Agreement may be executed in any number of 
counterparts, all of which together shall constitute one and the same 
instrument.

Dated: October 5, 1998                  THE DOW CHEMICAL COMPANY

                                        By:  /s/ G. MICHAEL LYNCH
                                             --------------------------------
                                        Name:  G. Michael Lynch
                                        Title: Vice President and Controller


                                        ROFAN SERVICES INC.

                                        By:  /s/ J. PEDRO REINHARD
                                             --------------------------------
                                        Name:  J. Pedro Reinhard
                                        Title: President


                                        CENTEN AG INC.

                                        By:  /s/ BRIAN G. TAYLORSON
                                             --------------------------------
                                        Name:  Brian G. Taylorson
                                        Title: President


                                        DOW AGROSCIENCES LLC

                                        By:  /s/ LOUIS W. PRIBILA
                                             --------------------------------
                                        Name:  Louis W. Pribila
                                        Title: Vice President, Secretary and
                                               General Counsel


                                        AGROSCIENCES ACQUISITION INC.

                                        By:  /s/ BRIAN G. TAYLORSON
                                             --------------------------------
                                        Name:  Brian G. Taylorson
                                        Title: President




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