MILBERG WEISS BERSHAD
  HYNES & LERACH LLP
WILLIAM S. LERACH (68581)
ALAN SCHULMAN (128661)
DARREN J. ROBBINS (168593)
600 West Broadway, Suite 1800
San Diego, CA 92101
Telephone:  619/231-1058

BERNSTEIN LIEBHARD & LIFSHITZ
STANLEY D. BERNSTEIN
274 Madison Avenue
New York, NY 10016
Telephone:  212/779-1414

Attorneys for Plaintiff

                   SUPERIOR COURT OF THE STATE OF CALIFORNIA

                             COUNTY OF SAN DIEGO


ELLIS INVESTMENTS, LTD., On Behalf    )  Case No. 720257
of Itself and All Others Similarly    )
Situated,                             )  CLASS ACTION
                    Plaintiff,        )
                                      )  COMPLAINT FOR BREACHES OF
     vs.                              )  FIDUCIARY DUTIES
                                      )
CARLTON J. EIBL, PERRY J. GEHRING,    )
NICKOLAS D. HEIN, LOUIS W. PRIBILA,   )
WILLIAM C. SCHMIDT, G. WILLIAM        )
TOLBERT, MYCOGEN CORP., DOW           )
AGROSCIENCES LLC and DOES 1-25,       )
inclusive                             )
                                      )
                    Defendants.       )  Plaintiff Demands A
                                      )  Trial By Jury
- ------------------------------------- )  -------------------



     Plaintiff, by its attorneys, for its complaint against defendants, 
alleges upon information and belief, except for paragraph 4 hereof, which is 
alleged upon knowledge, as follows:

 
                               JURISDICTION AND VENUE

     1.   This Court has jurisdiction over all causes of action asserted 
herein pursuant to the California Constitution, Article XL, Section 10, 
because this case is a cause not given by statute to other trial courts.

     2.   This Court has jurisdiction over Mycogen because this defendant is 
a California corporation with its principal place of business at 5501 
Oberlin Drive, San Diego, California.

     3.   Venue is proper in this Court because the conduct at issue took 
place and had an effect in this County and defendants made misrepresentations 
which had an effect in this County.

     4.   This Court has jurisdiction over all causes of action asserted 
herein pursuant to the California Constitution, Article XL, Section 10, 
because this case is a cause not given by statute to other trial courts.

     5.   This Court has jurisdiction over Mycogen because this defendant is 
a California corporation with its principal place of business at 5501 Oberlin 
Drive, San Diego, California.

     6.   Venue is proper in this Court because the conduct at issue took 
place and had an effect in this County and defendants made misrepresentations 
which had an effect in this County.


                                     PARTIES

     7.   Plaintiff Ellis Investments, Ltd. has been the owner of the common 
stock of the Mycogen Corp. ("Mycogen" or the "Company")


                                       1


since prior to the transaction herein complained of and continuously to date.

     8.  Defendant Mycogen is a corporation duly organized and existing under 
the laws of the State of California and maintains its principal executive 
offices at 5501 Oberlin Drive, San Diego, California. The Company is a 
diversified agribusiness and biotechnology company that develops and markets 
seed for improved crop varieties and provides crop protection products and 
services.

     9.  Defendant Dow AgroSciences LLC ("Dow AG") is a wholly owned 
subsidiary of the Dow Chemical Company which maintains its principal offices 
at 2030 Dow Center, Midland, Michigan. Dow AG owns or controls approximately 
69% of Mycogen.

     10.  Defendant Nickolas D. Hein is Chairman of the Board of Directors of 
Mycogen.

     11.  Defendant Carlton J. Eibl is President and a Director of Mycogen.

     12.  Defendant Perry J. Gehring is a Director of Mycogen and a Vice 
President of Dow AG.

     13.  Defendant Louis W. Pribila is a Director of Mycogen and a Vice 
President and General Counsel of Dow AG.

     14.  Defendant William C. Schmidt is a Director of Mycogen and Vice 
President and Chief Financial Officer of Dow AG.

     15.  Defendant G. William Tolbert is a Director of Mycogen and a 
Director of Dow AG.

     16.  The Individual Defendants named in paragraphs 7 through 12 are 
controlled by Dow AG and are in a fiduciary relationship with plaintiff and 
the other public stockholders of Mycogen and owe them the highest obligations 
of good faith and fair dealing.

                                      2 

     


     17. The true names and capacitates of defendants sued herein under 
California Code of Civil Procedure  Section 474 as Does 1 through 25, 
inclusive, are presently not known to plaintiff, who therefore sues these 
defendants by such fictitious names. Plaintiff will seek to amend this 
Complaint and include these Doe defendants' true names and capacities when 
they are ascertained. Each of the fictitiously named defendants is 
responsible in some manner for the conduct alleged herein and for the 
injuries suffered by the Class.

     18. Each defendant herein is sued individually as a conspirator and aider 
and abbetor, as well as in his capacity as an officer and/or director of the 
Company (in the case of the Individual Defendants), or as a control person, 
and the liability of each arises from the fact that he or it has engaged in 
all or part of the unlawful acts, plans, schemes, or transactions complained 
of herein.

                                 CLASS ACTION ALLEGATIONS
                                 ------------------------

     19. Plaintiff brings this action on its own behalf and as a class 
action, pursuant to Section 382 of the California Code of Civil Procedure, on 
behalf of all common stockholders of the Company (except the defendants 
herein and any person, firm, trust, corporation or other entity related to or 
affiliated with any of the defendants) and their successors in interest, who
are or will be threatened with injury arising from defendants' actions as 
more fully described herein (the "Class").

     20. This action is properly maintainable as a class action.

     21. The Class is so numerous that joinder of all members is 
impracticable. As of November 25,1997, there were in excess of 


                                        3



31.4 million shares of Mycogen common stock outstanding, of which 
approximately 31% were held by persons not affiliated with Dow AG.

     22.   There are questions of law and fact which are common to the Class 
and which predominate over questions affecting any individual Class member. 
The common questions include, inter alia, the following: (a) whether 
defendants have breached their fiduciary and other common law duties owed by 
them to plaintiff and the members of the Class; (b) whether defendants are 
pursing a scheme or course of conduct designed to eliminate the public 
securities holders of Mycogen in violation of the laws of the State of 
California in order to enrich Dow AG at the expense and to the detriment of 
the public shareholders of Mycogen; (c) whether the proposed transaction, 
hereinafter described, constitutes a breach of the duty of fair dealing with 
respect to the plaintiff and the other members of the Class; and (d) whether 
the Class is entitled to injunctive relief or damages as a result of the 
wrongful conduct committed by defendants.

     23.   Plaintiff is committed to prosecuting this action and has retained 
competent counsel experienced in litigation of this nature. The claims of the 
plaintiff are typical of the claims of other members of the Class, and 
plaintiff has the same interests as  the other members the Class. Plaintiff 
will fairly and adequately represent the Class. A class action is superior to 
any other type of adjudication of this controversy.

     24.   Defendants have acted in a manner which affects plaintiff and all 
members of the Class, thereby making appropriate injunctive relief and/or 
corresponding declaratory relief with respect to the Class as a whole.



                                  4


     25.   The prosecution of separate actions by individual members of the 
Class would create a risk of inconsistent or varying adjudications with 
respect to individual members of the Class, which would establish 
incompatible standards of conduct for defendants, or adjudications with 
respect to individual members of the Class which would, as a practical matter, 
be dispositive of the interests of other members or substantially impair or 
impede their ability to protect their interests.

                            SUBSTANTIVE ALLEGATIONS

     26.  In February 1996, Dow AG (at the time known as Dow AG LLC) purchased 
37% of Mycogen's common stock from the Lubrizol Corporation, and in a 
simultaneous transaction, Mycogen issued Dow AG 9% of its common stock in 
return for cash and Dow AG's seed businesses. As part of this transaction, 
Dow AG entered into an agreement (the "1996 Agreement") whereby it was 
prohibited from acquiring all of the shares of Mycogen prior to February 1999.

     27.   On April 30, 1998, Dow, through a press release, announced that, 
through Dow AG, it had requested an amendment to the 1996 Agreement to permit 
Dow AG to acquire the shares of Mycogen that it does not already own. If the 
amendment to the 1996 Agreement is approved, Dow AG will offer to purchase 
the shares held by Mycogen's minority shareholders for $20.50 per share.

     28.   The press release indicated that Dow's request to amend the 1996 
Agreement would have to be approved by "Mycogen's board of directors and the 
independent directors." Given Dow's stranglehold over the Company, none of 
the directors can be considered "independent," and they cannot be expected to 
vigorously protect the rights and interests of Mycogen's public shareholders.


                                      5


     Accordingly, the approval of the amendment is a foregone conclusion.

     29.  The price of $20.50 per share to be paid to the Class members is 
unconscionable, unfair and grossly inadequate consideration because, among 
other things: (a) the intrinsic value of the stock of Mycogen is materially 
in excess of $20.50 per share, giving due consideration to the possibilities 
of growth and profitability of Mycogen in light of its business, earnings and 
earnings power, present and future; (b) the $20.50 per share price is 
inadequate and offers no premium to the public stockholders of Mycogen in 
light of the fact that Mycogen shares closed at $20.50 on April 30, 1998, 
prior to the announcement by Dow; and (c) the $20.50 per share price is not 
the result of arm's-length negotiations but was fixed arbitrarily by Dow AG 
to "cap" the market price of Mycogen stock. As part of a plan for Dow AG to 
obtain complete ownership of Mycogen's assets and business at the lowest 
possible price.

     30.  The proposed bid serves no legitimate business purpose of Mycogen 
but rather is an attempt by defendants to unfairly benefit Dow AG from the 
transaction at the expense of Mycogen's public stockholders. The proposed 
plan will, for a grossly inadequate consideration, deny plaintiff and the 
other members of the Class their right to share proportionately in the future 
success of Mycogen and its valuable assets, while permitting Dow AG to reap 
huge benefits from the transaction.

     31.  By reason of the foregoing acts, practices and course of conduct, 
Dow AG has breached and will breach its duty as

                                      6



controlling stockholder of Mycogen by engaging in improper overreaching in 
attempting to carry out the proposed transaction.

     32.   By reason of the foregoing, the Individual Defendants will violate 
their fiduciary duties to Mycogen and the minority stockholders of Mycogen in 
the event that they fail to oppose the bid on the terms presently proposed.

     33.   Plaintiff and the Class have suffered and will continue to suffer 
irreparable damage unless defendants are enjoined from breaching their 
fiduciary duties and from carrying out the aforesaid plan and scheme.

     34.   Plaintiff and the other members of the Class have no adequate 
remedy at law.


                               PRAYER FOR RELIEF

     WHEREFORE, plaintiff demands judgment against the defendants jointly and 
severally, as follows:

     1.   declaring this action to be a class action and certifying 
plaintiff as Class representative;

     2.   enjoining, preliminarily and permanently, Dow AG's offer for 
acquisition of the Mycogen stock owned by plaintiff and the other members of 
the Class under the terms presently proposed;

     3.   to the extent, if any, that the transaction or transactions 
complained of are consummated prior to the entry of this Court's final 
judgment, rescinding such transaction or transactions, and granting, inter 
alia, rescissory damages;

     4.   directing that defendants pay to plaintiff and the other members of 
the Class all damages caused to them and account for all profits and any 
special benefits obtained as a result of their unlawful conduct;


                                       7



     5.  awarding the plaintiff the costs and disbursements of this action, 
including a reasonable allowance for the fees and expenses of plaintiff's 
attorneys and experts; and

     6.  granting plaintiff and the other members of the Class such other and 
further relief as may be just and proper.

DATED:  May 1, 1998                  MILBERG WEISS BERSHAD
                                      HYNES & LERACH LLP
                                     WILLIAM S. LERACH
                                     ALAN SCHULMAN
                                     DARREN J. ROBBINS




                                     /S/ Alan Schulman
                                     -----------------------------------
                                             ALAN SCHULMAN

                                     600 West Broadway, Suite 1800
                                     San Diego, CA 92101
                                     Telephone: 619/231-1058

                                     BERNSTEIN LIEBHARD & LIFSHITZ
                                     STANLEY D. BERNSTEIN
                                     274 Madison Avenue
                                     New York, NY 10016
                                     Telephone: 212/779-1414

                                     Attorneys for Plaintiff



                                      8



2MILBERG WEISS BERSHAD
  HYNES & LERACH LLP
WILLIAM S. LERACH (68581)
ALAN SCHULMAN (128661)
DAREN J. ROBBINS (168593)
600 West Broadway, Suite 1800
San Diego, CA 92101
Telephone:  619/231-1058

BERNSTEIN LIEBHARD & LIFSHITZ
STANLEY D. BERNSTEIN
274 Madison Avenue
New Yor, NY 10016
Telephone: 212/779-1414

Attorneys for Plaintiff

                   SUPERIOR COURT OF THE STATE OF CALIFORNIA
                             COUNTY OF SAN DIEGO

ELLIS INVESTMENTS, LTD., On behalf    )  Case No.
of Itself and All Others Similarly    )
Situated,                             )  CLASS ACTION
                    Plaintiff,        )
                                      )
     vs.                              )  JURY DEMAND
                                      )
CARLTON H. EIBL, PERRY J. GEHRING,    )
NICKOLAS D. HEIN, LOUIS W. PRIBILA,   )
WILLIAM C. SCHMIDT, G. WILLIAM        )
TOLBERT, MYCOGEN CORP., and DOW       )
AGROSCIENCES LLC, and DOES 1-25,      )
inclusive                             )
                                      )
                    Defendants.       )
                                      )
- ------------------------------------- )





     Plaintiff demands a trial by jury.

DATED:  May 1, 1998                  MILBERG WEISS BERSHAD
                                      HYNES & LERACH LLP
                                     WILLIAM S. LERACH
                                     ALAN SCHULMAN
                                     DARREN J. ROBBINS




                                     /S/ Alan Schulman
                                     -----------------------------------
                                             ALAN SCHULMAN

                                     600 West Broadway, Suite 1800
                                     San Diego, CA 92101
                                     Telephone: 619/231-1058

                                     BERNSTEIN LIEHARD & LIFSHITZ
                                     STANLEY D. BERNSTEIN
                                     274 Madison Avenue
                                     New York, NY 10016
                                     Telephone: 212/779-1414

                                     Attorneys for Plaintiff




                                   1