AGREEMENT --------- Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, as amended, The Dow Chemical Company, a Delaware corporation, ("TDCC") Rofan Services Inc., a Delaware corporation, ("Rofan") and DowElanco, an Indiana general...

 

                                   AGREEMENT
                                   ---------


     Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, as
amended, The Dow Chemical Company, a Delaware corporation, ("TDCC") Rofan
Services Inc., a Delaware corporation, ("Rofan") and DowElanco, an Indiana
general partnership ("DowElanco"), hereby agree that the Schedule 13D, together
with any amendments thereto, relating to shares of common stock, $.001 par value
per share, of Mycogen Corporation, is filed on behalf of each of TDCC, Rofan and
DowElanco.

Dated:  January 25, 1996

                                 The Dow Chemical Company


                                 By: /s/ J. Xxxxx Xxxxxxxx
                                     --------------------------------- 
                                 Name: J. Xxxxx Xxxxxxxx
                                 Title:  Financial Vice President,
                                         Treasurer and Chief
                                         Financial Officer

 
                                 Rofan Services Inc.


                                 By: /s/ J. Xxxxx Xxxxxxxx
                                     --------------------------------- 
                                 Name: J. Xxxxx Xxxxxxxx
                                 Title: President


                                 DowElanco


                                 By: /s/ Xxxxx X. Xxxxxxx
                                     --------------------------------- 
                                 Name: Xxxxx X. Xxxxxxx
                                 Title: Vice President, Secretary
                                        and General Counsel