DUPONT E I DE NEMOURS & CO
SC 13D/A, 1997-09-29
PLASTIC MATERIAL, SYNTH RESIN/RUBBER, CELLULOS (NO GLASS)
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                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 1)

                      Pioneer Hi-Bred International, Inc.
         ------------------------------------------------------------
                               (Name of Issuer)

                                 Common Stock,
                           par value $1.00 per share
         ------------------------------------------------------------
                        (Title of Class and Securities)

                                   723686101
         ------------------------------------------------------------
                     (CUSIP Number of Class of Securities)

                             Mary E. Bowler, Esq.
              Senior Counsel E.I. du Pont de Nemours and Company
                              1007 Market Street
                          Wilmington, Delaware 19898
                                (302) 774-5303
         -------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized
                    to Receive Notices and Communications)

                                   Copy to:

                              Lou R. Kling, Esq.
                   Skadden, Arps, Slate, Meagher & Flom LLP
                               919 Third Avenue
                           New York, New York 10022
                                (212) 735-3000

                              September 18, 1997

         ------------------------------------------------------------
                         (Date of Event which Requires
                           Filing of this Statement)

          If the filing person has previously filed a statement on Schedule
          13G to report the acquisition which is the subject of this Statement
          because of Rule 13d-1(b)(3) or (4), check the following: ( )

          Check the following box if a fee is being paid with this
          Statement:                               ( )


                                 SCHEDULE 13D

     CUSIP No. 723686101
     -----------------------------------------------------------------
     (1)  NAMES OF REPORTING PERSONS
          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

                  E.I. DU PONT DE NEMOURS AND COMPANY
                  51-0014090

     -----------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                           (a)  ( )
                                                           (b)  ( )
     -----------------------------------------------------------------
     (3)  SEC USE ONLY

     -----------------------------------------------------------------
     (4)  SOURCE OF FUNDS

                  WC, OO

     -----------------------------------------------------------------
     (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
          PURSUANT TO ITEMS 2(d) or 2(e)                    (  )

     ------------------------------------------------------------------
     (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

                  DELAWARE

     -----------------------------------------------------------------
                                     (7)  SOLE VOTING POWER
                                     None
       NUMBER OF SHARES            ___________________________________
         BENEFICIALLY                (8)  SHARED VOTING POWER
            OWNED BY
             EACH                  164,445.86 shares of Series A Convertible
            REPORTNING             Preferred Stock (convertible upon transfer
           PERSON WITH             and under certain other circumstances into
                                   16,444,586 shares of Common Stock)
                                   ___________________________________
                                     (9)  SOLE DISPOSITIVE POWER

                                     None
                                   ___________________________________
                                    (10)  SHARED DISPOSITIVE POWER

                                   164,445.86 shares of Series A
                                   Convertible Preferred Stock
                                   (convertible upon transfer and under
                                   certain other circumstances into
                                   16,444,586 shares of Common Stock)
     -----------------------------------------------------------------
     (11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              164,445.86 shares of Series A Convertible Preferred Stock
              (convertible upon transfer and under certain other
              circumstances into 16,444,586 shares of Common Stock)
     -----------------------------------------------------------------
     (12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN
          SHARES                                      (  )

     -----------------------------------------------------------------
     (13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              100% of the Series A Convertible Preferred Stock
              (convertible upon transfer and under certain other
              circumstances into approximately 16.7% of the Common Stock
              outstanding as of the date hereof)
     -----------------------------------------------------------------
     (14) TYPE OF REPORTING PERSON

                  CO
     -----------------------------------------------------------------




                                 SCHEDULE 13D

     CUSIP No. 723686101

     -----------------------------------------------------------------
     (1)  NAMES OF REPORTING PERSONS
          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

                  DU PONT CHEMICAL AND ENERGY OPERATIONS, INC.
                  51-0313062

     -----------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                           (a)  ( )
                                                           (b)  ( )
     -----------------------------------------------------------------
     (3)  SEC USE ONLY

     -----------------------------------------------------------------
     (4)  SOURCE OF FUNDS

                  WC
     -----------------------------------------------------------------
     (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
          PURSUANT TO ITEMS 2(d) or 2(e)                    (  )

     ------------------------------------------------------------------
     (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

                  DELAWARE
     -----------------------------------------------------------------
                                     (7)  SOLE VOTING POWER

                                     None

       NUMBER OF SHARES            ___________________________________
         BENEFICIALLY                (8)  SHARED VOTING POWER
           OWNED BY
              EACH                 164,445.86 shares of Series A Convertible
           REPORTING               Preferred Stock, par value $.01 per shares
          PERSON WITH              (convertible upon transfer and under 
                                   certain other circumstances into 
                                   16,444,586 shares of Common Stock, par 
                                   value $1.00 per share)
                                  ___________________________________
                                    (9)  SOLE DISPOSITIVE POWER

                                     None
                                  ___________________________________
                                    (10)  SHARED DISPOSITIVE POWER

                                   164,445.86 shares of Series A
                                   Convertible Preferred Stock
                                   (convertible upon transfer and under
                                   certain other circumstances into
                                   16,444,586 shares of Common Stock)

     -----------------------------------------------------------------
     (11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          164,445.86 shares of Series A Convertible Preferred Stock
          (convertible upon transfer and under certain other
          circumstances into 16,444,586 shares of Common Stock)

     -----------------------------------------------------------------
     (12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN
          SHARES                                      (  )

     -----------------------------------------------------------------
     (13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

          100% of the Series A Convertible Preferred Stock
          (convertible upon transfer and under certain other
          circumstances into approximately 16.7% of the Common Stock
          outstanding as of the date hereof)

     -----------------------------------------------------------------
     (14) TYPE OF REPORTING PERSON

          CO

     -----------------------------------------------------------------



            This Amendment No. 1 to the Schedule 13D (the "Amended
Schedule 13D"), filed pursuant to Rule 13d-1 of the Rules and Regulations
under the Securities Exchange Act of 1934, as amended (the "Exchange Act")
by E.I. du Pont de Nemours and Company, a Delaware corporation ("DuPont")
and Du Pont Chemical and Energy Operations, Inc. ("DCEO"), amends and
restates the Schedule 13D filed by DuPont on August 18, 1997 (the
"Original Schedule 13D") relating to the acquisition of the Series A
Convertible Preferred Stock, par value $.01 per share (the "Preferred
Stock"), of Pioneer Hi-Bred International, Inc., an Iowa corporation
("Pioneer"), which is convertible into shares of Common Stock, par value
$1.00, of Pioneer (the "Common Stock"):

ITEM 1      Security and Issuer

            This Amended Schedule 13D relates to the Common Stock of
Pioneer. The principal executive offices of Pioneer are located at 700
Capital Square, 400 Locust, Des Moines, Iowa 50309.

ITEM 2      Identity and Background

            This Amended Schedule 13D is filed by DuPont and DCEO, which
are both Delaware corporations. The principal executive offices of DuPont
are located at 1007 Market Street, Wilmington, Delaware 19898. The
principal executive offices of DCEO are located at Suite 8045, 1007 Market
Street, Wilmington, Delaware 19898. DuPont is a global chemical, energy
and life sciences company whose businesses manufacture and sell a wide
range of products in many different markets including energy,
transportation, textile, construction, automotive, agriculture, printing,
health care, packaging and electronic markets. DCEO, a holding company, is
a wholly-owned subsidiary of DuPont whose businesses include the making,
maintenance and mangement of intangible investments and the collection and
distribution of the income from such investments or from tangible
property.

            Set forth below are the name, address and present principal
occupation or employment with DuPont and DCEO (except as otherwise
indicated) of each director and executive officer of DuPont and DCEO .
With the exception of Percy N. Barnevik, who is a Swedish citizen, Goro
Watanabe, who is a Japanese citizen, and Robert Gachot, who is a French
citizen, each person listed below is a citizen of the United States of
America.

DuPont

Name and Address                   Position

Percy N. Barnevik                  Chairman - ABB Asea Brown Boveri Ltd.;
ABB Asea Brown Boveri Ltd.                Director
PO Box 8131
CH-8050
Zurich, Switzerland

Andrew F. Brimmer                  President and Director - Brimmer &
Brimmer & Company, Inc.                  Company, Inc.; Director
4400 MacArthur Blvd., NW
Suite 302
Washington, DC 20007

Louisa C. Duemling                 Director
c/o John Thayer
1100 DuPont Building
1007 Market Street
Wilmington, DE 19898

Archie W. Dunham                   Executive Vice President; Director
Conoco Inc.
PE-3034
600 North Dairy Ashford
Houston, TX 77079

Edward B. du Pont                  Director
100 West 10th Street
Suite 1109
Wilmington, DE 19801

Charles M. Harper                  Director
Suite 1500
One Central Park Plaza
Omaha, NE 68102

Charles O. Holliday, Jr.           Executive Vice President; Director
DuPont Asia Pacific
9000 DuPont Building
1007 Market Street
Wilmington, DE 19898

Lois D. Juliber                    Executive Vice President and Chief of
Colgate-Palmolive                        Operations, Developed Markets,
300 Park Avenue                          Colgate-Palmolive Company; Director
New York, NY 10022

John A. Krol                       President and Chief Executive Officer;
Administration                           Director
9000 DuPont Building
1007 Market Street
Wilmington, DE 19898

William K. Reilly                  Chief Executive Officer - Aqua 
1250 24th Street N.W.                    International Partners; Director
Sixth Floor
Washington, D.C. 20037

H. Rodney Sharp, III               Director
PO Box 3779
Greenville, DE 19807

Charles M. Vest                    President - Massachusetts Institute of
111 Memorial Drive                       Technology; Director
Cambridge, MA 02142

Goro Watanabe                      Executive Vice President and Representative
2-1 Ohtemachi 1-chome                    Director - Mitsui & Co., Ltd.;
Chiyoda-Ky, Tokyo 100 Japan              Director

Edgar S. Woolard, Jr.              Chairman of the Board of Directors
Administration
9000 DuPont Building
1007 Market Street
Wilmington, DE 19898

Jerald A. Blumberg                 Executive Vice President
Administration
9000 DuPont Building
1007 Market Street
Wilmington, DE 19898

Gary W. Edwards                    Senior Vice President
Conoco Inc.
PE-3052
600 No. Dairy Ashford
Houston, TX 77079

Kurt M. Landgraf                   Executive Vice President
DuPont Finance
D-8000
1007 Market Street
Wilmington, DE 19898

Robert E. McKee, III               Senior Vice President
Conoco Inc.
PE-3070
600 N. Dairy Ashford
Houston, TX 77079

Joseph A. Miller                   Senior Vice President
DuPont Research and Development
E-328/411
Rt. 141 and Henry Clay
Wilmington, DE 19880

Stacey J. Mobley                   Senior Vice President
DuPont External Affairs
N-9510
1007 Market Street
Wilmington, DE 19898

Howard J. Rudge                    Senior Vice President and General Counsel
DuPont Legal
D-7038
1007 Market Street
Wilmington, DE 19898


DCEO

Name and Address                   Position

Charles L. Downing                 Vice President and Treasurer; Director
Du Pont Chemical and
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

Robert Gachot                      Vice President and Assistant Treasurer;
Du Pont Chemical and               Director
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

John C. Sargent                    President; Director
Du Pont Chemical and
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

Calissa W. Brown                   Assistant Secretary
Du Pont Chemical and
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

Ann L. Douglas                     Assistant Treasurer
Du Pont Chemical and
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

Michael Koziski                    Assistant Treasurer
Du Pont Chemical and
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

Loriann Lea                        Secretary
Du Pont Chemical and
Energy Operations, Inc.
1007 Market Street
Wilmington, DE 19898

            During the last five years, neither DuPont nor DCEO, nor, to
the best knowledge of DuPont and DCEO, any director or executive officer
of DuPont or DCEO has been (i) convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors) or (ii) a party to
a civil proceeding of a judicial or administrative body of competent
jurisdiction and as a result of such proceeding has been or is subject to
a judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, federal or state
securities laws or finding any violation with respect to such laws.

ITEM 3      Source and Amount of Funds or Other Consideration

            The funds used by DCEO to consummate the purchase of the
Preferred Stock as described in Item 6 came from DuPont's repayment to
DCEO of previously issued loans and notes. The funds used by DuPont to
make such repayment to DCEO came from cash on hand and the sale of
commercial paper. The aggregate purchase price paid by DuPont and DCEO for
the Preferred Stock at the Closing (as defined below) was $1,710,236,944.

ITEM 4      Purpose of Transaction

            As described in Item 6 below, pursuant to an Investment
Agreement, dated as of August 6, 1997 (the "Investment Agreement"),
between DuPont and Pioneer, and the Letter Agreement (as defined below),
at the closing of the transactions contemplated by the Investment
Agreement on September 18, 1997 (the "Closing"), DCEO purchased 164,445.86
shares of Preferred Stock from Pioneer. As described in Item 6 below, the
Investment Agreement generally precludes DuPont or any entity controlled
by it (the "DuPont Group") from acquiring any Pioneer voting securities
during the term of the Investment Agreement, except for certain rights
that allow DuPont to obtain and maintain a specified equity ownership
interest (as discussed in Item 6 below). The Investment Agreement also
provides for certain sell down requirements such that the DuPont Group's
equity ownership level does not exceed a specified level (as discussed in
Item 6 below). The purpose of DuPont's and DCEO's investment in Pioneer is
to complement the related transactions contemplated by a Research Alliance
Agreement and the Joint Venture Formation Agreements (each as defined
below) by providing DuPont with equity participation in Pioneer's equity
interest in the commercial joint venture established thereby.

            In accordance with the terms of the Investment Agreement, at
and as of the Closing and subject to the terms and conditions of the
Investment Agreement, DuPont will be entitled to designate two nominees to
Pioneer's Board of Directors; such number of nominees may be increased to
three nominees in the event of an increase in the size of Pioneer's Board
of Directors and may be reduced to none based on the DuPont Group's equity
ownership level in Pioneer.

            In connection with the transactions contemplated by the
Investment Agreement, DuPont and Pioneer entered into Joint Venture
Formation Agreements and a Research Alliance Agreement contemplating
certain transactions more fully described in Item 6 below.

            Pursuant to the terms of the Investment Agreement, Pioneer has
agreed to use the proceeds from the sale of Preferred Stock to DCEO to
repurchase shares of its Common Stock by commencing shortly after the
Closing a dutch auction tender offer (and, thereafter, if necessary,
through open market repurchases) with Pioneer seeking to repurchase
sufficient shares to increase DuPont's equity ownership level up to
approximately 19.99%.

            Except as set forth above, DuPont and DCEO have no present
plans or proposals that relate to or would result in any of the actions
described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

ITEM 5      Interest in Securities of the Issuer

            (a) and (b) As of the date hereof, DuPont, through its
wholly-owned subsidiary DCEO, beneficially owns an aggregate of 164,445.86
shares of Preferred Stock (convertible upon transfer and under certain
other circumstances into 16,444,586 shares of Common Stock). Such shares
represent 100% of the shares of Preferred Stock anticipated to be
outstanding at the Closing (convertible upon transfer and under certain
other circumstances into approximately 16.67% of the shares of Common
Stock outstanding at the Closing (based on the number of shares of Common
Stock stated to be outstanding as of Pioneer's Quarterly Report on Form
10-Q for the quarterly period ended May 30, 1997 and assuming that the
Preferred Stock to be acquired by DCEO was converted in full)). DuPont and
DCEO share the power to vote and to dispose of the shares of Preferred
Stock (and to vote and dispose of the shares of Common Stock such
Preferred Stock is convertible into) subject to the terms and conditions
of the Investment Agreement.

            Except as set forth in this Item 5, to the best knowledge of
DuPont and DCEO, no director or executive officer of DuPont or DCEO
beneficially owns any shares of Preferred Stock or Common Stock.

            (c) Other than the transactions contemplated by the Investment
Agreement described herein, neither DuPont nor DCEO, nor, to the best
knowledge of DuPont and DCEO, any director or executive officer of DuPont
or DCEO, has effected any transactions in Preferred Stock or Common Stock
during the past 60 days.

            (d) No person, other than DuPont and DCEO, has the right to
receive dividends from the Preferred Stock (or the Common Stock such
Preferred Stock is convertible into), and no person other than DuPont and
DCEO has the right to receive the proceeds from the sale of Preferred
Stock (or the Common Stock such Preferred Stock is convertible into).

            (e)   Not applicable.

ITEM 6      Contracts, Arrangement, Understanding or Relationships With 
            Respect to Securities of the Issuer

            On August 6, 1997, Pioneer and DuPont entered into a Research
Alliance Agreement (the "Research Alliance Agreement") and a Formation
Agreement and a Limited Liability Company Agreement (collectively, the
"Joint Venture Formation Agreements") which, along with the Investment
Agreement, established a broad research alliance and collaboration between
the two companies that includes the formation of a joint venture to
exploit business opportunities in quality grain traits and an equity
investment by DuPont in Pioneer.

            Pursuant to the Research Alliance Agreement, Pioneer and
DuPont have agreed to a broad research alliance to collaborate to take
advantage of their respective expertise in technology and know-how
concerning quality grain traits, agronomic traits, industrial use traits,
genomics and enabling technologies for developing seed, grain, grain
products, plant materials and other crop improvement products. Pursuant to
the Joint Venture Formation Agreements, the jointly owned commercial joint
venture (with each party owning 50%) will create, maximize and capture
value for quality traits.

            The Investment Agreement provides for the acquisition by
DuPont of a new series of Preferred Stock which represents a common
equivalent economic ownership interest in Pioneer equal to approximately
19.99% of Pioneer's outstanding shares of Common Stock outstanding at the
Closing before giving effect to the transaction, and approximately 16.67%
after giving effect thereto. The Investment Agreement requires the DuPont
Group to sell down certain shares such that its equity ownership level
does not exceed a specified level (generally 20% subject to reduction in
certain instances including following the sale of shares by the DuPont
Group) and allows the DuPont Group to purchase additional shares of Common
Stock in order to maintain its equity ownership level. Pioneer has agreed
to repurchase certain shares of its Common Stock with the proceeds of the
sale of Preferred Stock to DCEO as described in Item 4 above.

            As more fully specified in the Investment Agreement, the
DuPont Group has agreed that it will generally not make any proposals
seeking a business combination involving Pioneer, deposit Pioneer voting
securities into a voting trust (except as provided in the Investment
Agreement) or make any similar arrangements regarding Pioneer voting
securities, engage in a proxy contest or solicitation, call a meeting of
shareholders or seek shareholder approval of any action or participate in
a group with other holders of Pioneer voting securities. The Investment
Agreement contains certain restrictions on the transfer of Preferred Stock
held by the DuPont Group and grants Pioneer a right of first offer or a
right of first refusal with respect to certain such transfers. At the
Closing, DuPont and Pioneer entered into a Registration Rights Agreement
granting the DuPont Group certain registration rights with respect to
shares of Common Stock into which the Preferred Stock is convertible.

            The Investment Agreement grants DuPont certain rights to
nominate directors to Pioneer's Board of Directors as set forth in Item 4
above. The DuPont Group has agreed to vote its shares of Preferred Stock
for the election of the slate of nominees proposed by Pioneer for election
to its Board of Directors (so long as DuPont's nominees are included in
such slate) and, except for certain matters specified in the Investment
Agreement, DuPont is otherwise free to vote such shares as it elects
provided that, in certain instances, any votes in excess of DuPont's
equity ownership percentage at the time of the vote must be voted by
DuPont pro rate in accordance with the vote of shareholders of Pioneer
other than the DuPont Group.

            Upon the occurrence of certain events including the
acquisition by a third party of a specified equity interest in Pioneer,
certain of the restrictions and rights set forth above and in the
Investment Agreement are modified, terminated or become perpetual, and
certain additional rights may come into effect including the termination
of the Joint Venture Formation Agreements (and the purchase or sale of the
commercial joint venture established in accordance therewith) and the
Research Alliance Agreement. The Investment Agreement may be terminated
following one year's prior written notice deliverable be either party
following the 15th anniversary of the date thereof.

            Pursuant to the terms of the Preferred Stock, the Preferred
Stock is convertible upon sale to a third party (other than a member of
the DuPont Group) and upon certain other circumstances. In certain
circumstances following the sixth anniversary of the date of the
Investment Agreement, the Preferred Stock may convert at the option of
DuPont into Common Stock, in which case, DuPont has agreed that such
shares of Common Stock will be placed in a voting trust with such shares
to be voted in accordance with the provisions specified above and as set
forth in the Investment Agreement.

            At the Closing, DuPont, DCEO and Pioneer entered into a letter
agreement (the "Letter Agreement") whereby DuPont directed Pioneer to
issue the Preferred Stock to DCEO and whereby DCEO agreed to be bound by
the terms of the Investment Agreement to the same extent as DuPont.

            The preceding summary of certain provisions of the Investment
Agreement and the related agreements is not intended to be complete and is
qualified in its entirety by reference to the full text of the Investment
Agreement, a copy of which is filed as an Exhibit hereto.

            Except as set forth herein, DuPont does not and DCEO does not,
nor to the best knowledge of DuPont and DCEO, does any director or
executive officer of DuPont or DCEO, have any contract, arrangement,
understanding or relationship (legal or otherwise) with any person with
respect to any securities of Pioneer, including, but not limited to,
transfer or voting of any securities of Pioneer, finder's fees, joint
ventures, loan or option arrangements, puts or calls, guarantees of
profits, division of profits or loss, or the giving or withholding of
proxies.

ITEM 7      Material to be Filed as Exhibits

            (a)   Investment Agreement, dated as of August 6, 1997, between
                  Pioneer and DuPont.

            (b)   Letter Agreement, dated as of September 18, 1997, between
                  Pioneer, DuPont and DCEO.


                                 SIGNATURE

            After reasonable 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:      September 29, 1997

                                         E.I. DU PONT DE NEMOURS AND
                                           COMPANY

                                         By: /s/ Kurt M. Landgraf
                                             _____________________________
                                               Kurt M. Landgraf
                                               Executive Vice President -
                                               DuPont Finance and Chief
                                               Financial Officer



                                 SIGNATURE

            After reasonable 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:      September 29, 1997

                                        DUPONT CHEMICAL AND ENERGY
                                          OPERATIONS, INC.

                                        By: /s/ John C. Sargent
                                            _______________________________
                                              John C. Sargent
                                              President
                                              Du Pont Chemical and Energy
                                              Operations, Inc.


                               EXHIBIT INDEX

(a)   Investment Agreement, dated as of August 6, 1997,
      between Pioneer and DuPont.

(b)   Letter Agreement, dated as of September 18, 1997, between Pioneer, 
      DuPont and DCEO.







                                                  Exhibit (a)

                             INVESTMENT AGREEMENT
                          dated as of August 6, 1997
                                   between
                     E.I. DU PONT DE NEMOURS AND COMPANY
                                     and
                     PIONEER HI-BRED INTERNATIONAL, INC.


                              TABLE OF CONTENTS

          SECTION 1 DEFINITIONS . . . . . . . . . . . . . . . .   7
               Section 1.1.  Definitions  . . . . . . . . . . .   7
               Section 1.2.  General Interpretive Principles  .  21

          SECTION 2 ISSUANCE AND SALE OF SHARES . . . . . . . .  21
               Section 2.1.  Issuance and Sale of Shares  . . .  21
               Section 2.2.  Closing  . . . . . . . . . . . . .  22

          SECTION 3 REPRESENTATIONS AND WARRANTIES OF THE
               COMPANY  . . . . . . . . . . . . . . . . . . . .  22
               Section 3.1.  Corporate Organization and
                    Qualification . . . . . . . . . . . . . . .  22
               Section 3.2.  Authorization of Agreements  . . .  22
               Section 3.3.  Consents; No Conflicts . . . . . .  23
               Section 3.4.  Capitalization . . . . . . . . . .  24
               Section 3.5.  Company Reports; Financial
                    Statements  . . . . . . . . . . . . . . . .  25
               Section 3.6.  Absence of Certain Changes . . . .  26
               Section 3.7.  Litigation . . . . . . . . . . . .  26
               Section 3.8.  Compliance with Laws; Regulatory
                    Approvals . . . . . . . . . . . . . . . . .  26
               Section 3.9.  Exemption from Registration  . . .  27

          SECTION 4 REPRESENTATIONS AND WARRANTIES OF THE
               INVESTOR . . . . . . . . . . . . . . . . . . . .  27
               Section 4.1.  Organization . . . . . . . . . . .  27
               Section 4.2.  Authorization of Agreements  . . .  27
               Section 4.3.  Consents; No Conflicts . . . . . .  27
               Section 4.4.  Investor Reports; Financial
                    Statements  . . . . . . . . . . . . . . . .  28
               Section 4.5.  Absence of Certain Changes . . . .  29
               Section 4.6.  Purchase for Purpose of
                    Investment  . . . . . . . . . . . . . . . .  29

          SECTION 5 GOVERNANCE  . . . . . . . . . . . . . . . .  30
               Section 5.1.  Directors Designated by the
                    Shareholder . . . . . . . . . . . . . . . .  30
               Section 5.2.  Resignation of Investor Nominees .  33
               Section 5.3.  Committees . . . . . . . . . . . .  33

          SECTION 6 ADDITIONAL AGREEMENTS . . . . . . . . . . .  33
               Section 6.1.  Standstill Agreement . . . . . . .  33
               Section 6.2.  Voting . . . . . . . . . . . . . .  36
               Section 6.3.  Dispositions . . . . . . . . . . .  38
               Section 6.4. Company's Right to Purchase Voting
                    Securities  . . . . . . . . . . . . . . . .  42
               Section 6.5.  Company's Right to Purchase
                    Voting Securities in Case of Unsolicited
                    Offer . . . . . . . . . . . . . . . . . . .  46
               Section 6.6.  Required Dispositions  . . . . . .  49
               Section 6.7.  Top-Up Rights; Permitted
                    Reacquisitions; Exchange of Share
                    Certificates  . . . . . . . . . . . . . . .  51
               Section 6.8.  Spin-off Distributions . . . . . .  53
               Section 6.9.  Competing Investments  . . . . . .  53
               Section 6.10.  Rights of the Company upon a
                    Trigger Event . . . . . . . . . . . . . . .  56

          SECTION 7 PRE-CLOSING COVENANTS . . . . . . . . . . .  57
               Section 7.1. Taking of Necessary Action  . . . .  57
               Section 7.2.  Notifications  . . . . . . . . . .  57
               Section 7.3.  No-Shop  . . . . . . . . . . . . .  57
               Section 7.4.  Share Listing  . . . . . . . . . .  58
               Section 7.5.  Registration Rights Agreement  . .  58
               Section 7.6.  Pre-Closing Information  . . . . .  58

          SECTION 8 ADDITIONAL COVENANTS  . . . . . . . . . . .  58
               Section 8.1.  Certain Information  . . . . . . .  58
               Section 8.2.  Right to Participate in Sale of
                    the Company . . . . . . . . . . . . . . . .  59
               Section 8.3.  Use of Proceeds  . . . . . . . . .  62
               Section 8.4. Rights Agreement  . . . . . . . . .  64
               Section 8.5. Publicity . . . . . . . . . . . . .  64
               Section 8.6.  Legend . . . . . . . . . . . . . .  64
               Section 8.7.  No Restrictions  . . . . . . . . .  65
               Section 8.8.  Amendment to Articles of
                    Incorporation . . . . . . . . . . . . . . .  65
               Section 8.9.  HSR Act Filings  . . . . . . . . .  67

          SECTION 9 CONDITIONS  . . . . . . . . . . . . . . . .  67
               Section 9.1. Conditions of Investor's
                    Obligation  . . . . . . . . . . . . . . . .  67
               Section 9.2. Conditions of the Company's
                    Obligation  . . . . . . . . . . . . . . . .  68

          SECTION 10     TERMINATION  . . . . . . . . . . . . .  69
               Section 10.1.  Termination . . . . . . . . . . .  69
               Section 10.2. Effect of Termination  . . . . . .  69

          SECTION 11     MISCELLANEOUS  . . . . . . . . . . . .  70
               Section 11.1.  Fees and Expenses . . . . . . . .  70
               Section 11.2. Survival . . . . . . . . . . . . .  70
               Section 11.3. Notices  . . . . . . . . . . . . .  70
               Section 11.4.  Entire Agreement; Amendment . . .  71
               Section 11.5. Counterparts . . . . . . . . . . .  71
               Section 11.6. Governing Law; Submission to
                    Jurisdiction  . . . . . . . . . . . . . . .  71
               Section 11.7. Successors and Assigns . . . . . .  72
               Section 11.8. Assignment . . . . . . . . . . . .  72
               Section 11.9. Remedies; Waiver . . . . . . . . .  72
               Section 11.10. Specific Performance  . . . . . .  72
               Section 11.11. Severability  . . . . . . . . . .  72

          EXHIBIT A   Form of Registration Rights Agreement
          EXHIBIT B   Form of Rights Agreement Amendment
          EXHIBIT C   Form of Certificate of Designation
          EXHIBIT D   Initial Investor Nominee Notice



                             INVESTMENT AGREEMENT

                    INVESTMENT AGREEMENT, dated as of August 6,
          1997 (the "Agreement"), by and between E.I. du Pont de
          Nemours and Company, a Delaware corporation (the
          "Investor"), and Pioneer Hi-Bred International, Inc., an
          Iowa corporation (the "Company").

                                   W I T N E S S E T H:

                    WHEREAS, contemporaneously herewith, the
          parties are entering into a Joint Venture Agreement and a
          Research Alliance Agreement (each as defined herein);

                    WHEREAS, the Company and the Investor have each
          determined to enter into this Agreement pursuant to which
          the Investor has agreed to purchase from the Company, and
          the Company has agreed to issue and sell to the Investor,
          in each case subject to the conditions herein, the Shares
          at the Closing (each as defined herein);

                    NOW, THEREFORE, in consideration of the
          premises and the mutual representations, warranties,
          covenants and agreements contained herein, the parties
          hereto hereby agree as follows:

                                  SECTION 1

                                 DEFINITIONS

                    Section 1.1.  Definitions. As used in this
          Agreement, the following terms shall have the meanings
          set forth below:

                    "Acceptance Notice" has the meaning set forth
          in Section  6.4(a) hereof.

                    "Affiliate" of a Person has the meaning set
          forth in Rule  12b-2 under the Exchange Act.

                    "Agreement" has the meaning set forth in the
          preamble  hereto.
           
                    "Amended Rights Agreement" means the Rights
          Agreement, as amended by the Rights Agreement Amendment
          and as further amended from time to time in accordance
          with the terms of this Agreement.

                    "Articles of Incorporation" means the Third
          Restated and Amended Articles of Incorporation of the
          Company,  as amended from time to time.

                    "Associate" of a Person has the meaning set
          forth in Rule 12b-2 under the Exchange Act.

                    "Beneficially Own" with respect to any
          securities means having "beneficial ownership" of such
          securities (as determined pursuant to Rule 13d-3 under
          the Exchange Act, as in effect on the date hereof,
          without limitation by the 60-day provision in paragraph
          (d)(1)(i) thereof). The terms "Beneficial Ownership" and
          "Beneficial Owner" have correlative meanings.

                    "Board" or "Board of Directors" means the Board
          of Directors of the Company.

                    "Business Day" means any day, other than a
          Saturday, Sunday or a day on which banking institutions
          in the State of Iowa or the State of Delaware are
          authorized or obligated by law or executive order to
          close.

                    "Bylaws" means the Restated and Amended Bylaws
          of the Company as amended from time to time.

                    "Change in Control" means the occurrence of any
          of the following events:

                         (a)  the direct or indirect purchase or
          acquisition by any Person or 13D Group (other than an
          Excluded Person) of Beneficial Ownership of Voting
          Securities or Common Securities of the Company if, after
          giving effect to such acquisition, such Person or 13D
          Group would Beneficially Own Voting Securities or Common
          Securities representing an Equity Percentage of 30% or
          more on a fully diluted basis; or

                         (b) the consummation by the Company or any
          of its Subsidiaries of a merger, consolidation or other
          business combination (including a sale of all or
          substantially all of the assets of the Company (other
          than to wholly-owned Subsidiaries of the Company)) that
          requires the approval of the Company's shareholders,
          whether for such transaction or the issuance of
          securities in such transaction, if immediately after
          giving effect to such transaction, the Persons who
          Beneficially Owned Voting Securities or Common Securities
          immediately prior to such transaction Beneficially Own in
          the aggregate Voting Securities or Common Securities (or
          voting securities or common securities in the case of a
          surviving entity other than the Company) representing a
          Voting Ownership Percentage or a Total Ownership
          Percentage (or voting power or common equity ownership of
          common securities in the case of a surviving entity other
          than the Company) on a fully diluted basis of less than
          50% immediately after giving effect to such transaction;
          or

                         (c)  the consummation by the Company of a
          plan of complete liquidation or dissolution of the
          Company.

                    "Change in Control Transaction" means a
          transaction which, if consummated, would result in a
          Change in Control.

                    "Closing" means the closing of the sale and
          purchase of the Shares pursuant to Section 2.1 hereof.

                    "Closing Date" has the meaning set forth in
          Section 2.2 hereof.

                    "Commission" means the Securities and Exchange
          Commission.

                    "Common Securities" means the Common Stock, the
          Series A Convertible Preferred Stock and any other
          securities of the Company (excluding non-voting
          securities (other than capital stock) issued to
          directors, officers or employees of the Company as
          compensation) to the extent to which such securities by
          the terms thereof (i) are not effectively limited in
          amount as to dividends or amounts payable upon
          liquidation of the Company or (ii) are otherwise a
          substantial equivalent of Common Stock as to dividends or
          upon liquidation of the Company or upon consummation of a
          merger or other extraordinary transaction in which the
          outstanding shares of Common Stock participate.

                    "Common Stock" means the Common Stock, par
          value $1.00 per share, of the Company.

                    "Company" has the meaning set forth in the
          preamble hereto.

                    "Company Buy Back Period" means the period
          beginning on the Closing Date and ending twelve months
          thereafter.

                    "Company Repurchase" has the meaning set forth
          in Section 6.6(a).

                    "Competing Investment" means the acquisition by
          a Competitor (other than in connection with a Change in
          Control Transaction) of Beneficial Ownership of (i)
          Common Securities (A) directly from the Company or any
          Subsidiary of the Company, (B) pursuant to an agreement
          with the Company or any of its Subsidiaries (a
          "Competitor Agreement") providing either for the issuance
          or transfer by the Company or any of its Subsidiaries of
          such Common Securities or providing for the waiver or
          inapplicability of the Amended Rights Agreement (or a
          Substantially Similar Plan) with respect to the ownership
          of such Common Securities, or (C) where, in connection
          with such acquisition, the Company waives or renders the
          Amended Rights Agreement (or a Substantially Similar
          Plan) inapplicable thereto, in each case, if, after
          giving effect to such acquisition, the Competitor would,
          in the case of clauses (A), (B) and (C) above, to the
          knowledge of the Company, after reasonable inquiry,
          Beneficially Own Common Securities either (x) in excess
          of the Trigger Amount (as defined in the Amended Rights
          Agreement, as then in effect, as such term (or comparable
          term) may be amended from time to time by the Company in
          its sole discretion) or (y) representing an Equity
          Percentage of 15% or more or with a number of Votes of
          15% or more of the Total Voting Power, (ii) Common
          Securities representing an Equity Percentage of 15% or
          more (whether acquired from the Company or otherwise)
          (provided that this clause (ii) will apply only if the
          Company shall amend, waive or modify the Amended Rights
          Agreement as in effect on the date of this Agreement (or
          a Substantially Similar Plan) so as to increase the
          percentage "15%" referred to in clause (i) of the
          definition of Trigger Amount in the Amended Rights
          Agreement or increase the percentage "10%" or the
          fraction "one-fourth (1/4)" referred to in clause (ii) of
          the definition thereof or otherwise render the Amended
          Rights Agreement inapplicable (including by taking action
          to cause a Section 11(a)(ii) Event or Section 13 Event
          (each as defined in the Amended Rights Agreement as in
          effect on the date hereof), not to occur that, absent
          such action, would otherwise have occurred, or to redeem
          the Preferred Stock Purchase Rights) to an acquisition
          referred to in this clause (ii) (whether or not done in
          connection therewith or in anticipation thereof) or so as
          to provide that the acquisition of any additional shares
          of Common Stock under the circumstances contemplated by
          clause (2) of the proviso to paragraph (a)(ii) of the
          definition of Acquiring Person contained in the Amended
          Rights Agreement (or similar provision of any
          Substantially Similar Plan) will not have the effect
          specified in said clause (2) (other than any such
          amendment, waiver, modification or redemption legally
          required to be made by the Board as a result of a
          shareholder-sponsored resolution or a final and
          non-appealable court order, in each case, that is opposed
          by the Board; provided, that for purposes of this clause
          (ii) references to the "Amended Rights Agreement" shall
          also refer to a Substantially Similar Plan in which the
          term "Trigger Amount" or comparable term thereto, and the
          consequences resulting from its occurrence, are
          substantially identical to those set forth in the Amended
          Rights Agreement on the date of this Agreement including
          containing the same percentages and fraction as those set
          forth above), or (iii) (a) Common Securities representing
          an Equity Percentage of 10% or more, and (b) the right
          (whether such right is contingent, conditional or
          otherwise) to designate or nominate one or more Directors
          (or if the Board within five years after the date of the
          acquisition of shares specified in clause (a), nominates
          or appoints any designee of such Competitor or its
          Affiliates to the Board). An acquisition of Beneficial
          Ownership of Common Securities in excess of a percentage
          of Votes shall be deemed to have occurred when, as a
          result of such Common Securities becoming entitled to
          additional Votes by reason of the passage of time, such
          securities represent or have a number of Votes which
          represent more than the specified percentage and, in the
          case of clause (iii)(a) above, an acquisition of
          Beneficial Ownership of Common Securities in excess of an
          Equity Percentage shall be deemed to have occurred when,
          as a result of repurchases by the Company of Common
          Securities, such securities represent more than the
          specified percentage (provided that such 10% level in
          clause (iii)(a) above shall not be deemed exceeded by
          reason of the repurchase of Common Securities by the
          Company unless (i) an Equity Percentage of 10.5% or more
          is achieved and (ii) the Competitor fails to reduce its
          Beneficial Ownership of Common Securities to an Equity
          Percentage below 10% within one year after equaling or
          exceeding the 10.5% level). Notwithstanding the
          foregoing, (A) no transaction with a Person who is not,
          at the time such transaction is consummated or entered
          into, then designated as a Competitor shall be deemed a
          Competing Investment as a result of the subsequent
          designation of such Person by the Investor as a
          Competitor, but (B) by way of illustration, the
          acquisition of Common Securities from the Company by a
          Person (I) after which such acquisition such Person
          Beneficially Owned Common Securities in an amount
          satisfying the 15% requirement of clause (i) above, and
          (II) before which acquisition such Person had been
          designated a Competitor but whose Beneficial Ownership
          did not satisfy such 15% requirement, shall be deemed to
          be a Competing Investment.

                    "Competitor" means any Person that is one of
          eight participants in the agricultural chemicals or
          biotechnology market as designated to the Company by the
          Investor as a Competitor (which term shall include any
          Controlled Affiliate of each such Competitor and any 13D
          Group with respect to securities of the Company of which
          such Person is a member). The Investor shall provide to
          the Company prior to the date of this Agreement, and
          within 10 Business Days prior to each anniversary of the
          Closing Date, a written list of such Competitors (which
          Investor may change from year to year as of each
          anniversary of the Closing Date) which Competitors shall
          conform to the provisions of the definition of Competitor
          contained herein. The Competitors so designated shall
          constitute the Competitors hereunder for the initial
          period commencing on the Closing date hereof and ending
          one year following the Closing Date and the successive
          one year period following each applicable anniversary of
          the Closing Date and if no such notice is provided for
          any year, the Competitors specified in the notice for the
          most recent year that such notice was given shall
          continue to be deemed the Competitors.

                     "Competitor  Agreement  " shall have the
          meaning set forth in the definitions of the term
          "Competing Investment".

                    "Confidentiality Agreement" has the meaning set
          forth in Section 8.1(a) hereof.

                    "control" with respect to any Person means the
          possession, direct or indirect, of the power to direct or
          cause the direction of the management and policies of
          such Person, whether through the ownership of voting
          securities, by contract or otherwise.

                    "Controlled Affiliate" shall mean, with respect
          to any Person, any Affiliate of such Person that is
          controlled by or that controls or is under common control
          with such Person such that, in any such case, the
          controlling party has the legal or contractual power
          (including, without limitation, through negative control
          or through the controlling parties designees or
          representatives on the board of directors or other
          governing body of the parties controlled by the
          controlling or under the articles of incorporation or
          other constituent documents of such controlled parties or
          as a result of voting rights of any securities or other
          instruments issued by such controlled parties) to direct
          or to manage the direction of the business and policies
          of such Affiliate.

                    "Derivative Securities" means any
          subscriptions, options, conversion rights, warrants,
          phantom stock rights or other agreements, securities or
          commitments of any kind obligating the Company or any of
          its Subsidiaries to issue, grant, deliver or sell, or
          cause to be issued, granted, delivered or sold (i) any
          Common Securities or Voting Securities of the Company,
          (ii) any securities convertible into or exchangeable for
          any Common Securities or Voting Securities of the
          Company, or (iii) any obligations measured by the price
          or value of any shares of capital stock of the Company.

                    "Dilutive Issuance" has the meaning set forth
          in Section 6.7(e) hereof.

                    "Director" shall mean a director of the
          Company.

                    "Disposition" has the meaning set forth in
          Section 6.3(a) hereof.

                    "Equity Percentage" means, with respect to any
          Common Securities calculated at any particular point in
          time, the ratio, expressed as a percentage of (a) the
          total number of shares of Common Stock included in, or
          issuable upon conversion of (whether or not then
          convertible), or otherwise constituting the economic
          equivalent of, such Common Securities over (b) the total
          number of shares of Common Stock then outstanding and the
          number of shares of Common Stock issuable upon conversion
          of (whether or not then convertible), or otherwise
          constituting the economic equivalent of, all outstanding
          Common Securities.

                    "Exchange Act" means the Securities Exchange
          Act of 1934, as amended, and the regulations promulgated
          thereunder.

                    "Excluded Person" shall mean (i) any member of
          the Investor Group, (ii) any Grandfathered Person, (iii)
          any wholly owned Subsidiary of the Company, or (iv) any
          underwriter temporarily holding Common Securities in
          connection with a public offering of such securities.

                    "First Offer Price" has the meaning set forth
          in Section 6.4(a) hereof.

                    "Fully Independent Director" means a person who
          qualifies as an "outside director" of the Company and the
          Investor within the meaning of Section 162(m) of the
          Internal Revenue Code of 1986 as in effect on the date
          hereof and who is not (apart from such directorship) (i)
          a current or former officer or employee of the Company or
          any Affiliate of the Company, (ii) a current or former
          director, officer or employee of the Investor or any
          member of the Investor Group, (iii) did not in either of
          the last two completed calendar years receive, and is not
          an officer, director, employee, stockholder holding more
          than 10% of the voting interest of, partner or Affiliate
          of any person ("Entity") that in either of such Entity's
          two most recent fiscal years, received, more than 10% of
          such person's total revenues from either the Company or
          the Investor.

                    "GAAP" means United States generally accepted
          accounting principles.

                    "Governmental Entity" means any government or
          any agency, bureau, board, commission, court, department,
          political subdivision, tribunal, or other instrumentality
          of any government (including any regulatory or
          administrative agency), whether federal, state or local,
          domestic or foreign.

                    "Grandfathered Person" means any of the Persons
          specified in clauses (i) through (vi) of the term
          "Grandfathered Person" in the Amended Rights Agreement as
          in effect on the date of this Agreement and any 13D Group
          referred to in clause (B) below; provided, however, that
          a Grandfathered Person shall cease to be a Grandfathered
          Person if any of the following occur at any time: (A)
          such Grandfathered Person, individually or together with
          one or more other Grandfathered Persons, acting together
          or as part of a 13D Group, Beneficially Owns Common
          Securities representing an Equity Percentage of 40% or
          more on a fully diluted basis, or (B) such Grandfathered
          Person, individually or together with one or more
          Grandfathered Persons, are acting as part of a 13D Group
          which includes Persons who are not Grandfathered Persons
          and who individually or in the aggregate Beneficially
          Own, directly or indirectly, in excess of 1% of the then
          outstanding Common Securities provided that the reference
          to "1%" referred to in this clause (B) shall be increased
          to up to 5% so long as the Beneficial Ownership of the
          entire 13D Group referred to in this clause (B) does not
          have an Equity Percentage greater than 35%. 

                    "HSR Act" means the Hart-Scott-Rodino Antitrust
          Improvements Act of 1976, as amended, and the regulations
          promulgated thereunder.

                    "Independent Director" means a person who is
          not (apart from such directorship) (i) a current or
          former officer or employee of the Company or any
          Affiliate of the Company or (ii) a current or former
          director, officer or employee of the Investor or any
          member of the Investor Group or Other Investor Affiliate.

                    "Initial Investor Nominee Notice" has the
          meaning set forth in Section 5.1(a) hereof.

                    "Initial Top-Up Period" has the meaning set
          forth in Section 6.7(b)(i) hereof.

                    "Investor" has the meaning set forth in the
          preamble hereto.

                    "Investor Group" shall mean (a) the Investor,
          (b) any Subsidiary of the Investor, (c) any Affiliate of
          the Investor controlled by the Investor such that the
          Investor has the legal or contractual power (including,
          without limitation, through negative control or through
          the Investor's designees or representatives on the board
          of directors or other governing body of such Affiliate or
          under the articles of incorporation or other constituent
          documents of such Affiliate or as a result of the voting
          rights of any securities or other instruments issued by
          such Affiliate) to cause such Affiliate to comply with
          the terms of this Agreement applicable to the Investor,
          and (d) any Person with whom the Investor or any Person
          included in the foregoing clauses (b) or (c) is part of a
          13D Group.

                    "Investor Nominee Notice" has the meaning set
          forth in Section 5.1(a) hereof.

                    "Investor Nominee" has the meaning set forth in
          Section 5.1(a) hereof.

                    "Investor SEC Reports" has the meaning set
          forth in Section 4.4 hereof.

                    "Joint Venture Agreement" shall mean (i) the
          Formation Agreement, dated as of August 6, 1997, between
          the Company and the Investor (the "Formation Agreement")
          and (ii) the LLC Agreement referred to therein.

                    "Junior Preferred Stock" has the meaning set
          forth in Section 3.4(a) hereof.

                    "Law" means any law, treaty, statute,
          ordinance, code, rule or regulation of a Governmental
          Entity.

                    "Lien" means any security interest, claim,
          voting agreement, restriction, option, mortgage, deed of
          trust, pledge, hypothecation, assignment, charge or
          deposit arrangement, encumbrance, lien (statutory or
          other) or preferential arrangement of any kind or nature
          whatsoever and any contingent or other agreement to
          provide any of the foregoing.

                    "Loss" has the meaning set forth in Section
          6.6(b) hereof.

                    "Market Price," shall mean on any trading day,
          with respect to shares of Common Stock or any other
          security which is listed on a national securities
          exchange, the last sale price regular way, or, in case no
          such sale takes place on such day, the average of the
          closing bid and asked prices regular way, in either case
          on the NYSE, or, if the Common Stock or other security is
          not listed or admitted to trading on such exchange, on
          the principal national securities exchange on which the
          Common Stock or other security is listed or admitted to
          trading, or, if the Common Stock or other security is not
          listed or admitted to trading on any national securities
          exchange but is designated as national market system
          security by the NASD, the last sale price, or, in case no
          such sale takes place on such day, the average of the
          closing bid and asked prices, in either case as report on
          the NASD Automated Quotation/National Market System, or
          if the Common Stock or other security is not so
          designated as a national market systems security, the
          average of the highest reported bid and lowest reported
          asked prices as furnished by the NASD or similar
          organization if the NASD is no longer reporting such
          information.

                    "Material Adverse Effect" means any material
          adverse effect on the financial condition, business or
          operations of the Company and its Subsidiaries taken as a
          whole. 

                    "Maximum Offer Price" has the meaning set forth
          in Section 8.3(a) hereof.

                    "NASD" has the meaning set forth in Section
          6.4(b) hereof. 

                    "NYSE" means the New York Stock Exchange.

                    "Offer" has the meaning set forth in Section
          8.3(a).

                    "Offer Purchase Price" has the meaning set
          forth in Section 8.3(a).

                    "Options" has the meaning set forth in Section
          3.3(b) hereof.

                    "Order" means any judgment, decree, order,
          writ, award, ruling, stipulation, injunction or
          determination of an arbitrator or court or other
          Governmental Entity.

                    "Other Investor Affiliate" has the meaning set
          forth in Section 6.1(A) hereof.

                    "Ownership Cap" means a Total Ownership
          Percentage of 20%, subject to reduction as provided in
          Section 6.7(b).

                    "Per Share Price Range" has the meaning set
          forth in Section 8.3(a).

                    "Permitted Underwriter" has the meaning set
          forth in Section 6.3(b)(I) hereof.

                    "Person" means any individual, corporation,
          company, association, partnership, joint venture, limited
          liability company, trust or unincorporated organization,
          group (within the meaning of Rule 13d-5 under the
          Exchange Act) or a government or any agency or political
          subdivision thereof.

                    "Pioneer Competitor" means any Person that is
          one of eight participants in the seed market within the
          Field of Interest (as defined in the Research Alliance
          Agreement) as designated to the Investor by the Company
          as a Pioneer Competitor (which term shall exclude the
          Investor and its Subsidiaries but shall include any
          Controlled Affiliate of each such Pioneer Competitor, and
          the persons specified in writing by the Company to the
          Investor on the date of this Agreement, and any 13D Group
          with respect to voting securities of the Spin-Off Entity
          of which such Person is a member). The Company shall
          provide to the Investor prior to the date of this
          Agreement, and within 10 Business Days prior to each
          anniversary of the Closing Date, a written list of such
          Pioneer Competitors (which the Company may change from
          year to year as of each anniversary of the Closing Date)
          which Pioneer Competitors shall conform to the provisions
          of the definition of Pioneer Competitor contained herein.
          The Pioneer Competitors so designated shall constitute
          the Pioneer Competitors hereunder for the initial period
          commencing with the date hereof and ending one year
          following the Closing Date and the successive one year
          periods following each applicable anniversary of the
          Closing Date and if no such notice is provided for any
          year, the Competitors specified in the notice for the
          most recent year that such notice was given shall
          continue to be deemed the Pioneer Competitors.

                    "Post Termination Standstill Period" has the
          meaning set forth in Section 6.1(A) hereof.

                    "Preferred Stock Purchase Rights" means rights
          to purchase the Junior Preferred Stock pursuant to the
          Amended Rights Agreement, as amended from time to time.

                    "Process" has the meaning set forth in Section
          8.2 hereof.

                    "Proposal" means any inquiry, indication of
          interest, proposal or offer made to the Company or
          publicly disclosed by any Person relating to any Change
          in Control Transaction or Competing Investment.

                    "Purchase Price" has the meaning set forth in
          Section 2.1 hereof.

                    "Purchaser Standstill Agreement" has the
          meaning set forth in Section 6.3(B)(II) hereof.

                    "Purchasing Person" has the meaning set forth
          in Section 6.3(b) hereof.

                    "Reclassification Amendment" shall have the
          meaning set forth on Section 8.8.

                    "Registration Rights Agreement" means the
          agreement to be entered into on the Closing Date between
          the Company and the Investor in the form set forth in
          Exhibit A hereto.

                    "Regulatory Approvals" means any and all
          certificates, permits, licenses, franchises, concessions,
          grants, consents, approvals, orders, registrations,
          authorizations, waivers, variances or clearance from a
          Governmental Entity.

                    "Release Event" has the meaning set forth in
          Section 6.9 hereof.

                    "Representatives" means, with respect to any
          Person, any of such Person's officers, directors,
          partners, employees, agents, attorneys, accountants,
          consultants or financial or other advisors or other
          Person associated with or acting on behalf of such
          Person. 

                    "Required Disposition" has the meaning set
          forth in Section 6.6(a) hereof.

                    "Required Disposition Amount" has the meaning
          set forth in Section 6.6(a) hereof.

                    "Requisite Number" has the meaning set forth in
          Section 8.3(a).

                    "Research Alliance Agreement" shall mean the
          Research Alliance Agreement, dated as of August 6, 1997,
          between the Company and the Investor.

                    "Rights Agreement" means the Amended and
          Restated Rights Agreement, dated as of December 13, 1996,
          by and between the Company and The First National Bank of
          Boston, as Rights Agent.

                    "Rights Agreement Amendment" means the
          amendment to the Rights Agreement executed by the Company
          and the Rights Agent concurrently herewith in the form
          set forth in Exhibit B hereto.

                    "Sale of Ag Products" means (x) a sale or other
          transfer to one or more Persons other than a Subsidiary
          of the Investor of all or substantially all of the assets
          or business of the Agricultural Products business of the
          Investor or (y) a transfer (whether by sale, merger or
          other transaction) of any of the common equity of any
          Person through which any such assets are held (such
          entity or any transferee pursuant to clause (x) hereof a
          "Spin-Off Entity") if, after giving effect to such
          transfer, such Person is not a Subsidiary of the
          Investor, provided that a transfer referred to in this
          clause (y) effected by means of a dividend, distribution,
          bona fide public offering or otherwise, and a sale or
          transfer referred to in clause (x), in either case, shall
          not be a "Sale of Ag Products" if and for so long as all
          of the following conditions are and continue to be
          satisfied: (i) the Spin-Off Entity agrees to be and is
          bound by the provisions of Section 6.1(A) of the
          Agreement (to the same extent as if the Spin-Off Entity
          were a Subsidiary of the Investor), (ii) the Spin-Off
          Entity shall agree to be and is bound by the Research
          Alliance Agreement to the same extent as the Investor (it
          being understood that in no event shall the Investor be
          released from any of its obligations under this Agreement
          or the Research Alliance Agreement as a result of the
          Spin-Off Entity's agreement to the matters referred to in
          clauses (i) and (ii) above except that, in the case of
          the Research Alliance Agreement, if substantially all of
          the research capabilities of the Investor in agricultural
          products is transferred to the Spin-Off Entity, then the
          Investor will continue pursuant to the Research Alliance
          Agreement to provide the Company with, but only with,
          genomic and biotechnology support sufficient so that the
          research available to the Company from the Spin-Off
          Entity under the Research Alliance Agreement, when taken
          together with such support from the Investor, is
          substantially the same in scope and capability as the
          research available from the Investor prior to the
          transfer of such assets to the Spin-Off Entity), (iii) if
          at any time, any Person or 13D Group owns 15% or more of
          any class of voting securities of the Spin-Off Entity,
          the Investor and its wholly owned Subsidiaries must have
          an interest in the Voting Securities of the Spin-Off
          Entity greater than or equal to any other Person or 13D
          Group (however, such interest must be greater than that
          of any Person or 13D Group which is a Pioneer
          Competitor), (iv) no Pioneer Competitor may own voting or
          common securities of the Spin-Off Entity (A) representing
          more than 15% of the common securities or voting power of
          the Spin-Off Entity, which securities have been acquired
          directly from the Investor or the Spin-Off Entity or a
          Subsidiary of either, (B) representing 10% or more of the
          common securities of the Spin-Off Entity if the Pioneer
          Competitor has the right (whether such right is
          contingent, conditional or otherwise) to designate or
          nominate one or more directors of the Spin-Off Entity (or
          if the board of directors of the Spin-Off Entity within
          five years after the date of acquisition of shares
          referred to in this clause (B) nominates any designee of
          such Pioneer Competitor or any Affiliate of such Pioneer
          Competitor to the board of the Spin-Off Entity), provided
          that such 10% level in this clause (B) shall not be
          deemed exceeded by reason of the repurchase of common
          securities by the Spin-Off Entity unless (i) an ownership
          of 10.5% or more of the common securities is achieved and
          (ii) the Pioneer Competitor fails to reduce its
          Beneficial Ownership of common securities to an ownership
          level below 10% within one year after equaling or
          exceeding the 10.5% level or (C) representing in excess
          of the level of ownership that would cause a triggering
          event to occur under any rights plan or "poison pill"
          adopted by the Spin-Off Entity and then in effect, and
          (v) so long as the Investor owns less than 30% of the
          common equity of the Spin-Off Entity, the Company has the
          right to nominate one representative of the Company to
          the board of the Spin-Off Entity analogous to the rights
          of the Investor under Sections 5.1(b) and (c) and the
          first sentence of clause (d) thereof (provided that such
          representative must be one of the four most senior
          executives of the Company, and provided that, if any such
          representative of the Company on the board of the
          Spin-Off Entity is unable to attend any meeting of such
          board, the Company shall have the right to designate an
          alternate designee of the Company, who is also one of the
          four most senior executives of the Company, to attend
          such meeting of the board of the Spin-off Entity as an
          observer) and the Investor shall use commercially
          reasonable efforts (including by voting its voting
          securities in favor of such nominee) to cause such
          nominee to be elected to the board of the Spin-Off Entity
          (it being understood that a Sale of Ag Products will be
          deemed to occur at any time any of the foregoing
          conditions cease to be satisfied; provided, however, that
          in the case of a failure of either clauses (iii) or (iv)
          above, the conditions as to ownership of common
          securities or voting securities by a Pioneer Competitor
          must have ceased to have been satisfied with respect to
          any Person or 13D Group only after the designation (to
          the extent in effect at such time) by the Company of such
          Person or 13D Group as a Pioneer Competitor).

                    "Section 6.4 Closing" has the meaning set forth
          in Section 6.4(a) hereof.

                    "Section 6.4 Price" has the meaning set forth
          in Section 6.4(b) hereof.

                    "Section 6.4 Securities" has the meaning set
          forth in Section 6.4(a) hereof.

                    "Section 6.5 Acceptance Notice" has the meaning
          set forth in Section 6.5(a) hereof.

                    "Section 6.5 Closing" has the meaning set forth
          in Section 6.5(a) hereof.

                    "Section 6.5 Price" has the meaning set forth
          in Section 6.5(b) hereof.

                    "Section 6.5 Securities" has the meaning set
          forth in Section 6.5(a) hereof.

                    "SEC Reports" has the meaning set forth in
          Section 3.5(a) hereof.

                    "Securities Act" means the Securities Act of
          1933, as amended, and the regulations promulgated
          thereunder.

                    "Sell Down Period" has the meaning set forth in
          Section 6.6(a) hereof.

                    "Series A Convertible Preferred Stock" has the
          meaning set forth in Section 2.1 hereof.

                    "Shares" has the meaning set forth in Section
          2.1 hereof.

                    "Spin-Off Agreement" has the meaning set forth
          in Section 6.8 hereof.

                    "Spin-Off Company" means the corporation or
          other entity the capital stock or other equity interests
          of which are distributed in a Spin-off Distribution.

                    "Spin-Off Distribution" means any distribution
          by the Company to all holders of Common Securities of
          capital stock of or other equity interests in any
          corporation or entity other than the Company.

                    "Spin-Off Entity" has the meaning set forth in
          the definition of the term "Sale of Ag Products".

                    "Standstill Period" means the period commencing
          on the date hereof and ending on the termination of this
          Agreement pursuant to Section 10.1; subject to extension
          upon the occurrence of a Trigger Event or a Release Event
          as provided in Section 10.2(iv).

                    "Subsidiary" means, as to any Person, any other
          Person more than fifty percent (50%) of the shares of the
          voting stock or other voting interests of which are owned
          or controlled, or the ability to select or elect more
          than fifty percent (50%) of the directors or similar
          managers is held, directly or indirectly, by such first
          Person or one or more of its Subsidiaries or by such
          first Person and one or more of its Subsidiaries. A
          Subsidiary that is directly or indirectly wholly-owned by
          another Person except for directors' qualifying shares
          shall be deemed wholly-owned for purposes of this
          Agreement.

                    "Substantially Similar Plan" has the meaning
          set forth in Section 8.4 hereof.

                    "Surviving Change in Control Transaction" has
          the meaning set forth in Section 8.2(b).

                    "13D Group" shall mean any group of Persons
          who, with respect to those acquiring, holding, voting or
          disposing of Voting Securities would, assuming ownership
          of the requisite percentage thereof, be required under
          Section 13(d) of the Exchange Act and the rules and
          regulations thereunder to file a statement on Schedule
          13D with the SEC as a "person" within the meaning of
          Section 13(d)(3) of the Exchange Act, or who would be
          considered a "person" for purposes of Section 13(g)(3) of
          the Exchange Act. "13D Group" when used with reference to
          standards or tests that are based on securities other
          than Voting Securities shall have the foregoing meaning
          except that the words "Voting Securities" in the second
          line of the definition of "13D Group", (i) in the case of
          standards or tests based on "securities of the Company",
          shall be replaced with the words "securities of the
          Company", and (ii) in the case of standards or tests
          based on "voting securities of the Spin-Off Entity",
          shall be replaced with the words "voting securities of
          the Spin-Off Entity."

                    "Third Party Offer" has meaning set forth in
          Section 6.4(a) hereof.

                    "Total Ownership Percentage" means, with
          respect to any Person calculated at a particular point in
          time, the ratio, expressed as a percentage, of (a) the
          total number of shares of Common Stock Beneficially Owned
          by such Person and issuable upon conversion of (whether
          or not then convertible), or otherwise constituting the
          economic equivalent of, all Common Securities
          Beneficially Owned by such Person, over (b) the total
          number of shares of Common Stock then outstanding and the
          number of shares of Common Stock issuable upon conversion
          (whether or not then convertible) of, or otherwise
          constituting the economic equivalent of, all outstanding
          Common Securities.

                    "Total Voting Power" shall mean, calculated at
          a particular point in time, the aggregate Votes
          represented by all then outstanding Voting Securities
          then entitled to vote (a) as estimated conclusively for
          purposes of the definition of the terms "Change in
          Control" and "Competing Investment" at any time in good
          faith by the Company on the assumption that all holders
          of Common Stock who would, upon taking the necessary
          documentation steps under the Articles of Incorporation,
          be entitled to five votes per share at such time, have
          effectively taken such steps, it being understood that it
          will be necessary for the Company to make various
          assumptions in connection therewith (such as identity of
          holders and period of ownership of shares of Common
          Stock) and (b) for all other purposes of this Agreement,
          based on the number of Votes as were actually entitled to
          vote at the then current or the most recent meeting of
          shareholders as determined by the Company which excludes
          any estimation of any kind (including, as to who would
          have been entitled to 5 votes per share if such
          shareholder had taken the requisite steps to obtain such
          vote) plus, without duplication of any Votes otherwise
          taken into account, the number of Votes attributable to
          any Voting Securities issued by the Company since the
          most recent meeting of shareholders of the Company.

                    "Transaction Agreements" means this Agreement,
          the Registration Rights Agreement and the Rights
          Agreement Amendment.

                    "Transfer" has the meaning set forth in Section
          6.7(b)(iii).

                    "Transfer Notice" has the meaning set forth in
          Section 6.4(a) hereof.

                    "Trigger Event" has the meaning set forth in
          Section 6.10 hereof.

                    "Unsolicited Offer" has the meaning set forth
          in Section 6.3(e) hereof.

                    "Votes" shall mean, at any time, with respect
          to any Voting Securities, the total number of votes that
          would be entitled to be cast by the holders of such
          Voting Securities generally (by the terms of such Voting
          Securities, the Articles of Incorporation or any
          certificate of designations for such Voting Securities)
          in a meeting for the election of Directors held at such
          time, including the votes that would be able to be cast
          by holders of shares of Series A Convertible Preferred
          Stock.

                    "Voting Amendment" has the meaning set forth in
          Section 6.2(a) hereof.

                    "Voting Ownership Percentage" shall mean,
          calculated at a particular point in time, the Voting
          Power represented by the Voting Securities Beneficially
          Owned by the Person whose Voting Ownership Percentage is
          being determined.

                    "Voting Power" shall mean, calculated at a
          particular point in time, the ratio, expressed as a
          percentage, of (a) the Votes represented by the Voting
          Securities with respect to which the Voting Power is
          being determined to (b) Total Voting Power.

                    "Voting Securities" means the shares of Common
          Stock, the Series A Convertible Preferred Stock and any
          other securities of the Company entitled to vote
          generally for the election of directors, and any
          securities (other than employee stock options) which are
          convertible into, or exercisable or exchangeable for,
          Voting Securities.

                    Section 1.2.  General Interpretive Principles.
          Whenever used in this Agreement, except as otherwise
          expressly provided or unless the context otherwise
          requires, any noun or pronoun shall be deemed to include
          the plural as well as the singular and to cover all
          genders. The name assigned this Agreement and the section
          captions used herein are for convenience of reference
          only and shall not be construed to affect the meaning,
          construction or effect hereof. Unless otherwise
          specified, the terms "hereof," "herein" and similar terms
          refer to this Agreement as a whole (including the
          exhibits, schedules and disclosure statements hereto),
          and references herein to Sections refer to Sections of
          this Agreement.

                                  SECTION 2

                         ISSUANCE AND SALE OF SHARES

                    Section 2.1.  Issuance and Sale of Shares. Upon
          the terms and subject to the conditions set forth in this
          Agreement, and in reliance upon the representations and
          warranties hereinafter set forth, on the Closing Date,
          the Company will issue, sell and deliver to the Investor,
          and the Investor will purchase from the Company,
          164,445.86 shares of Series A Convertible Preferred Stock
          of the Company, par value $.01 per share, having the
          terms set forth in the Certificate of Designation
          attached hereto as Exhibit C (the "Series A Convertible
          Preferred Stock"), together with the associated Preferred
          Stock Purchase Rights (such shares of Series A
          Convertible Preferred Stock, together with such Preferred
          Stock Purchase Rights, the "Shares"), free and clear of
          all Liens (other than Liens pursuant to this Agreement),
          for an aggregate purchase price of $1,710,236,944 (the
          "Purchase Price").

                    Section 2.2.  Closing.  (a)  The Closing shall
          take place at the offices of Fried, Frank, Harris,
          Shriver & Jacobson at 10:00 a.m., One New York Plaza, New
          York, NY 10004, New York City time, on the Business Day
          of the satisfaction or concurrent satisfaction or, if
          permissible, waiver of the conditions set forth in
          Sections 9.1 and 9.2 hereof (the "Closing Date") or at
          such other time and place as the parties may agree. 

                    (b) At the Closing (i) the Company will deliver
          to the Investor certificates representing the Shares
          against payment of the Purchase Price, registered in the
          name of the Investor, or any wholly-owned United States
          Subsidiary of the Investor designated by it (provided
          that such Subsidiary agrees in writing to be bound by
          this Agreement to the same extent as the Investor and
          such Subsidiary at all times remains a wholly-owned
          United States Subsidiary of the Investor), together with
          the other documents and certificates to be delivered
          pursuant to Section 9.1 hereof, and (ii) the Investor, in
          full payment for the Shares, will deliver to the Company
          an amount equal to the Purchase Price in immediately
          available funds by wire transfer to the account
          designated by the Company, at least two Business Days
          prior to the Closing Date, or by such other means as may
          be agreed by the parties, together with the other
          documents and certificates to be delivered pursuant to
          Section 9.2 hereof.

                                  SECTION 3

                REPRESENTATIONS AND WARRANTIES OF THE COMPANY

                    The Company hereby represents and warrants to,
          and agrees with, the Investor as follows:

                    Section 3.1.  Corporate Organization and
          Qualification. Each of the Company and its material
          Subsidiaries is a corporation duly organized, validly
          existing and in good standing under the laws of the
          jurisdiction of its incorporation and has all requisite
          corporate power and authority to own or lease its assets
          and to conduct its business. Each of the Company and its
          Subsidiaries is duly licensed or qualified as a foreign
          corporation for the transaction of its business and is in
          good standing under the laws of each other jurisdiction
          in which its ownership, lease or operation of property or
          conduct of its business requires such qualification,
          except where the failure to be so licensed, authorized
          and qualified and in good standing would not reasonably
          be expected to have a Material Adverse Effect. The
          Company has made available to the Investor a complete and
          correct copy of the Articles of Incorporation and the
          Bylaws of the Company, in each case as amended to date,
          and each of which as so made available, as the case may
          be, is in full force and effect.

                    Section 3.2.  Authorization of Agreements. (a) 
          The Company has all requisite corporate power and
          authority to execute, deliver and perform its obligations
          under the Transaction Agreements, to issue and sell the
          shares of Series A Convertible Preferred Stock to be sold
          to the Investor (or its permitted designee) hereunder and
          the shares of Common Stock issuable upon the conversion
          thereof and to otherwise consummate the transactions
          contemplated hereby and thereby and such issuance, sale
          and delivery of such shares of Series A Convertible
          Preferred Stock to the Investor (or its permitted
          designee) will convey to the Investor (or its permitted
          designee) (and any issuance of Common Stock upon any such
          conversion will convey to the Person to whom such Common
          Stock is issued) good and marketable title to such
          shares, free and clear of all Liens, other than Liens
          arising pursuant to any Transaction Agreement. The
          execution, delivery and performance of the Transaction
          Agreements, and the consummation by the Company of the
          transactions contemplated hereby and thereby, have been
          approved by the Board of Directors (by the vote of the
          directors as advised by the Company to the Investor in
          writing prior to the execution of this Agreement) and
          have been duly authorized by all other necessary
          corporate action on the part of the Company. The Company
          has taken the corporate action necessary to approve the
          transactions contemplated by this Agreement for purposes
          of Section 490.1109 of the Business Corporation Act of
          the State of Iowa and to provide that the Transaction
          Agreements and the transactions contemplated thereby
          shall be exempt from the requirements of any
          "moratorium," "control share," "fair price" or other
          anti-takeover laws or regulations of any state which, to
          the knowledge of the Company, is reasonably likely to
          otherwise be applicable thereto. 

                    (b)  Each of this Agreement and the Rights
          Agreement Amendment have been duly executed and delivered
          by the Company and constitutes a valid and binding
          obligation of the Company, enforceable against the
          Company in accordance with its terms, subject to
          applicable bankruptcy, insolvency and similar laws
          affecting creditors' rights generally and to general
          principles of equity. The Registration Rights Agreement,
          when executed, will have been duly executed and delivered
          by the Company and will constitute a valid and binding
          obligation of the Company, enforceable against the
          Company in accordance with its terms, subject to
          applicable bankruptcy, insolvency and similar laws
          affecting creditors' rights generally and to general
          principles of equity.

                    (c)  The execution, delivery and performance of
          the Transaction Agreements and the acquisition of the
          Shares contemplated thereby and the issuance of Common
          Stock to the Investor Group upon the conversion thereof
          in accordance with the Certificate of Designation for the
          Series A Convertible Preferred Stock will not cause a
          Distribution Date or constitute a Triggering Event, a
          Section 11(a)(ii) Event or a Section 13 Event (in each
          case, as defined in the Amended Rights Agreement) under
          the Amended Rights Agreement.

                    Section 3.3.  Consents; No Conflicts. (a) 
          Except for (i) the expiration of the waiting period under
          the HSR Act, (ii) if necessary, the approval of the NYSE
          required for listing of the Common Stock into which the
          Series A Convertible Preferred Stock is convertible,
          (iii) all consents, authorizations, orders and approvals
          of, and all filings and registrations, including the
          effectiveness of a registration statement and applicable
          "Blue Sky" clearance and, in each case required for, or
          in connection with, the consummation of the transactions
          contemplated by the Registration Rights Agreement, and
          (iv) the Regulatory Approvals set forth on Schedule 3.3,
          no Regulatory Approval from, or registration,
          declaration, notice or filing with, any Governmental
          Entity is required to be made or obtained by the Company
          or any of its Subsidiaries in connection with the
          execution, delivery and performance of the Transaction
          Agreements and the consummation of the transactions
          contemplated hereby and thereby, except for such
          Regulatory Approvals, registrations, declarations,
          notices and filings, (A) the failures of which to be made
          or obtained, would not in the aggregate reasonably be
          expected to have a Material Adverse Effect, or (B) which
          are applicable by reason of any facts specifically
          relating to, or the particular regulatory status of, the
          Investor.

                    (b) The execution and delivery of this
          Agreement and the Rights Agreement Amendment does not,
          and the execution and delivery of the Registration Rights
          Agreement will not, and the performance of the
          obligations set forth herein and therein and the
          consummation of the transactions contemplated hereby and
          thereby will not, (i) violate any provision of the
          Articles of Incorporation or the Bylaws or the other
          organizational documents of the Company or the comparable
          governing instruments of any of its material
          Subsidiaries; (ii) conflict with, contravene or result in
          a breach or violation of any of the terms or provisions
          of, or constitute a default (with or without notice or
          the passage of time) under, or result in or give rise to
          a right of termination, cancellation, acceleration,
          amendment or modification of any right or obligation
          under, or to a loss of any benefit to which any of the
          Company or its Subsidiaries is entitled, or give rise to
          a right to put or to compel a tender offer for
          outstanding securities of the Company or any of its
          Subsidiaries under, or require any consent, waiver,
          provision of notice or approval under, any note, bond,
          debt instrument, indenture, mortgage, deed of trust,
          lease, loan agreement, joint venture agreement,
          Regulatory Approval, contract or any other agreement,
          instrument or obligation to which the Company or any of
          its Subsidiaries is a party or by which the Company or
          any of its Subsidiaries or any property of the Company or
          any of its Subsidiaries is bound; (iii) result in the
          creation or imposition of any Lien upon any assets or
          properties of the Company or any of its Subsidiaries
          except pursuant to any Transaction Agreement; or (iv)
          violate or conflict with any Law or Order applicable to
          the Company or any of its Subsidiaries or any of their
          respective assets or properties of any Governmental
          Entity having jurisdiction over the Company or any of its
          Subsidiaries or any of their respective assets or
          properties, except in the case of clause (ii), clause
          (iii) and clause (iv) for such violations, conflicts,
          defaults, creation of Liens and other matters which would
          not in the aggregate reasonably be expected to have a
          Material Adverse Effect.

                    Section 3.4.  Capitalization. (a) The
          authorized capital stock of the Company consists of (i)
          150,000,000 shares of Common Stock, of which 82,222,935
          shares are issued and outstanding and (ii) 10,000,000
          shares of preferred stock, no par value, of which (x)
          150,000 shares have been designated Junior Participating
          Preferred Stock (the "Junior Preferred Stock"), of which
          no shares are outstanding and (y) 200,000 shares have
          been designated Series A Convertible Preferred Stock, of
          which no shares are outstanding. All of such outstanding
          shares of Common Stock were duly authorized and validly
          issued and are fully paid and non-assessable. 

                    (b)  Other than (i) shares of Common Stock
          reserved for issuance pursuant to the Company's stock
          option plan (the "Options"), (ii) shares of Common Stock
          reserved for issuance upon conversion of the Series A
          Convertible Preferred Stock and (iii) shares of Junior
          Preferred Stock reserved for issuance upon exercise of
          the currently existing Preferred Stock Purchase Rights,
          and except as set forth on Schedule 3.4(b)(1), there are
          not authorized or outstanding (or any obligations to
          authorize or issue) any Derivative Securities or any
          contract, agreement or understanding to pay any dividend
          on or make any distribution with respect to any capital
          stock or other securities of the Company. Schedule
          3.4(b)(2) sets forth the terms (including, without
          limitation, the exercise price and the expiration date)
          and number of each type of Derivative Securities
          outstanding. The transactions contemplated hereby will
          not affect the terms and provisions of, and will not
          alter the rights of holders of, any Derivative
          Securities, including but not limited to any
          anti-dilution adjustments to the number of outstanding
          Options, the exercise price thereof or the number of
          shares of Common Stock to be acquired upon exercise
          thereof. Other than pursuant to the Transaction
          Agreements and the Rights Agreement, there are no
          restrictions on the transfer of shares of capital stock
          of the Company, and no contract, agreement or
          understanding to which the Company is a party exists
          among holders of capital stock of the Company with
          respect to the ownership, holding, voting or any other
          rights or obligations with respect to such capital stock,
          except as set forth in Schedule 3.4(b)(3).

                    (c)  The shares of Series A Convertible
          Preferred Stock to be issued pursuant to this Agreement
          and the shares of Common Stock issuable upon conversion
          of such shares have been duly and validly authorized and,
          when such shares are issued as contemplated by this
          Agreement, will have been validly issued, fully paid and
          non-assessable. There are no, and the issuance and sale
          of the Series A Convertible Preferred Stock pursuant to
          this Agreement and the issuance of shares of Common Stock
          upon conversion of the Series A Convertible Preferred
          Stock will not give rise to any, preemptive rights,
          rights of first refusal or other similar rights on behalf
          of any Person under any provision of applicable Law or
          any provision of the Articles of Incorporation or Bylaws
          of the Company or of any agreement or instrument to which
          the Company or any of its material Subsidiaries is a
          party or by which the Company or any of its material
          Subsidiaries is bound in respect of any capital stock or
          other securities of the Company or its material
          Subsidiaries other than pursuant to the Transaction
          Agreements. No consent or approval of the Company's
          shareholders is required by Law, the Articles of
          Incorporation or Bylaws or otherwise for the execution,
          delivery and performance by the Company of the
          Transaction Agreements and the consummation of the
          transactions contemplated hereby and thereby.

                    Section 3.5.  Company Reports; Financial
          Statements. (a) The Company has delivered to the Investor
          a true and complete copy of (i) the Company's Annual
          Report on Form 10-K for the fiscal years ended August 31,
          1996, 1995 and 1994; (ii) the Company's Quarterly Report
          on Form 10-Q for the periods ended November 30, 1996,
          February 29, 1997 and May 30, 1997; and (iii) each
          registration statement, report on Form 8-K and Form 8-A,
          proxy statement, information statement or other document,
          report or statement filed by the Company or any of its
          Subsidiaries with the Commission since December 31, 1994,
          in each case in the form (including financial statements,
          schedules, exhibits and any amendments thereto) filed
          with the Commission (collectively, the "SEC Reports"). As
          of their respective dates, the SEC Reports (i) were
          timely filed with the Commission; (ii) complied, in all
          material respects, with the applicable requirements of
          the Exchange Act and the Securities Act; and (iii) did
          not contain any untrue statement of a material fact or
          omit to state a material fact required to be stated
          therein or necessary in order to make the statements
          therein, in light of the circumstances under which they
          were made, not misleading. Other than the SEC Reports,
          the Company and its Subsidiaries have not filed or been
          required to file any other reports or statements with the
          Commission since December 31, 1994.

                    (b)  Each of (i) the consolidated balance
          sheets (including the related notes and schedules)
          included in or incorporated by reference into the SEC
          Reports fairly presents the consolidated financial
          position of the Company and its Subsidiaries as of the
          date thereof, subject, in the case of unaudited
          statements, to normal year-end adjustments, and (ii) the
          consolidated statements of income (or statements of
          results of operations), shareholders' equity and cash
          flows (including the related notes and schedules)
          included in or incorporated by reference into the SEC
          Reports fairly presents the results of operations,
          retained earnings and cash flows, as the case may be, of
          the Company and its Subsidiaries (on a consolidated
          basis) for the periods set forth therein (subject, in the
          case of unaudited statements, to normal year-end
          adjustments and except as permitted by Form 10-Q of the
          Commission) in each case in accordance with GAAP applied
          on a consistent basis throughout the periods covered
          (except as stated therein or in the notes thereto) and in
          compliance with the rules and regulations of the
          Commission.

                    Section 3.6.  Absence of Certain Changes.
          Except for transactions contemplated by the Transaction
          Agreements or as disclosed in the SEC Reports or as set
          forth in Schedule 3.6, since August 31, 1996, there have
          not been any changes, conditions, occurrences,
          circumstances or other events that have had or would
          reasonably be expected to have a Material Adverse Effect.

                    Section 3.7.  Litigation. Except as disclosed
          in SEC Reports and Schedule 3.7 hereto, there are no
          claims, suits, actions, proceedings, arbitrations or
          investigations pending or, to the knowledge of the
          Company, threatened in writing against the Company or any
          of its material Subsidiaries that in the aggregate would
          reasonably be expected to have a Material Adverse Effect;
          nor are there any Orders outstanding against or
          applicable to the Company or any of its material
          Subsidiaries or against or applicable to any of their
          respective assets, properties or businesses which would
          reasonably be expected to have a Material Adverse Effect.

                    Section 3.8.  Compliance with Laws; Regulatory
          Approvals. Except as disclosed in the SEC Reports and
          except for matters which in the aggregate would not have
          a Material Adverse Effect, the Company and its
          Subsidiaries are in compliance with all applicable Laws.
          Except, for matters which in the aggregate, as would not
          have a Material Adverse Effect, (a) all material
          Regulatory Approvals required by the Company and its
          Subsidiaries to conduct their respective business as now
          conducted by them have been obtained and are in full
          force and effect and (b) the Company and its Subsidiaries
          are in compliance in all material respects with the terms
          and requirements of such Regulatory Approvals.

                    Section 3.9.  Exemption from Registration.
          Assuming the representations and warranties of the
          Investor set forth in Section 4 hereof are true and
          correct, the offer and sale of the shares of Series A
          Convertible Preferred Stock made pursuant to this
          Agreement will be in compliance with the Securities Act
          and any applicable state securities laws and will be
          exempt from the registration requirements of the
          Securities Act and such state securities laws.

                                  SECTION 4

                REPRESENTATIONS AND WARRANTIES OF THE INVESTOR

                    The Investor hereby represents and warrants to,
          and agrees with, the Company as follows:

                    Section 4.1.  Organization. The Investor is a
          corporation duly organized, validly existing and in good
          standing under the laws of the State of Delaware and has
          all requisite power and authority to own or lease its
          assets and to conduct its business.

                    Section 4.2.  Authorization of Agreements. (a)
          The Investor has all requisite power and authority to
          execute, deliver and perform its obligations under this
          Agreement, the Registration Rights Agreement and each
          other document, instrument or certificate to be executed
          by the Investor in connection with the consummation of
          the transactions contemplated by this Agreement. The
          execution, delivery and performance of this Agreement and
          the Registration Rights Agreement, and the consummation
          by the Investor of the transactions contemplated hereby
          and thereby, have been approved by the board of directors
          of the Investor (by the vote of the directors as advised
          by the Investor to the Company in writing prior to
          execution of this Agreement) and have been duly
          authorized by all other necessary corporate action on the
          part of the Investor.

                    (b) This Agreement has been duly executed and
          delivered by the Investor and constitutes a valid and
          binding obligation of the Investor, enforceable against
          the Investor in accordance with its terms, subject to
          applicable bankruptcy, insolvency and similar laws
          affecting creditors' rights generally and to general
          principles of equity. The Registration Rights Agreement,
          when executed, will have been duly executed and delivered
          by the Investor and will constitute a valid and binding
          obligation of the Investor, enforceable against the
          Investor in accordance with its terms, subject to
          applicable bankruptcy, insolvency and similar laws
          affecting creditors' rights generally and to general
          principles of equity.

                    Section 4.3.  Consents; No Conflicts. (a)
          Except for (i) the expiration of the waiting period under
          the HSR Act, (ii) all consents, authorizations, orders
          and approvals of, and filing and registrations including
          the effectiveness of a registration statement and
          applicable "Blue Sky" clearance required for, or in
          connection with, the consummation of the transactions
          contemplated by the Registration Rights Agreement, and
          (iii) the Regulatory Approvals set forth on Schedule 4.3,
          no Regulatory Approval from, or registration,
          declaration, notice or filing with, any Governmental
          Entity is required to be made or obtained by the Investor
          in connection with the execution, delivery and
          performance of this Agreement and the Registration Rights
          Agreement and the consummation of the transactions
          contemplated hereby and thereby except for such
          Regulatory Approvals, registrations, declarations,
          notices and filings, (A) the failures of which to make or
          obtain would not reasonably be expected to have a
          material adverse effect on the ability of the Investor to
          consummate or to perform its obligations under the
          Transaction Documents, or (B) which are applicable by
          reason of any facts specifically relating to, or the
          particular regulatory status of, the Company or its
          Subsidiaries.

                    (b) The execution and delivery of this
          Agreement does not, and the execution and delivery of the
          Registration Rights Agreement will not, and the
          performance of the obligations set forth herein and
          therein and the consummation of the transactions
          contemplated hereby and thereby will not, (i) violate any
          provision of the certificate of incorporation, by-laws or
          the other organizational documents of the Investor or any
          of its material Subsidiaries; (ii) give rise to a right
          to put or to compel a tender offer for outstanding
          securities of the Investor or any of its Subsidiaries
          under, or require any consent, waiver, provision of
          notice or approval under, any note, bond, debt
          instrument, indenture, mortgage, deed of trust, lease,
          loan agreement, joint venture agreement, Regulatory
          Approval, contract or any other agreement, instrument or
          obligation to which the Investor or any of its
          Subsidiaries is a party or by which the Investor or any
          property of the Investor or any of its material
          Subsidiaries is bound; (iii) result in the creation or
          imposition of any Lien upon the Series A Convertible
          Preferred Stock to be issued to the Investor pursuant to
          this Agreement, other than pursuant to a Transaction
          Agreement or (iv) violate or conflict with any Law or
          Order applicable to the Investor or any of its
          Subsidiaries or any of their respective assets or
          properties of any Governmental Entity having jurisdiction
          over the Investor or any of its Subsidiaries or any of
          their respective assets or properties, except in the case
          of clause (ii), clause (iii) and clause (iv) for such
          violations, conflicts, defaults, creation of Liens and
          other matters which would not reasonably be expected to
          have a material adverse effect on the ability of the
          Investor to consummate or to perform its obligations
          under the Transaction Documents.

                    Section 4.4.  Investor Reports; Financial
          Statements. (a) The Investor has delivered to the Company
          a true and complete copy of (i) the Investor's Annual
          Report on Form 10-K for the fiscal years ended December
          31, 1996, 1995 and 1994; (ii) the Investor's Quarterly
          Report on Form 10-Q for the period ended March 31, 1997;
          and (iii) each registration statement, report on Form 8-K
          and Form 8-A, proxy statement, information statement or
          other document, report or statement filed by the Investor
          or any of its Subsidiaries with the Commission since
          December 31, 1994, in each case in the form (including
          financial statements, schedules, exhibits and any
          amendments thereto) filed with the Commission
          (collectively, the "Investor SEC Reports"). As of their
          respective dates, the Investor SEC Reports (i) were
          timely filed with the Commission; (ii) complied, in all
          material respects, with the applicable requirements of
          the Exchange Act and the Securities Act; and (iii) did
          not contain any untrue statement of a material fact or
          omit to state a material fact required to be stated
          therein or necessary in order to make the statements
          therein, in light of the circumstances under which they
          were made, not misleading. Other than the SEC Reports,
          the Investor and its Subsidiaries have not filed or been
          required to file any other reports or statements with the
          Commission since December 31, 1994.

                    (b)  Each of (i) the consolidated balance
          sheets (including the related notes and schedules)
          included in or incorporated by reference into the
          Investor SEC Reports fairly presents the consolidated
          financial position of the Investor and its Subsidiaries
          as of the date thereof, subject, in the case of unaudited
          statements, to normal year-end adjustments, and (ii) the
          consolidated statements of income (or statements of
          results of operations), shareholders' equity and cash
          flows (including the related notes and schedules)
          included in or incorporated by reference into the
          Investor SEC Reports fairly presents the results of
          operations, retained earnings and cash flows, as the case
          may be, of the Investor and its Subsidiaries (on a
          consolidated basis) for the periods set forth therein
          (subject, in the case of unaudited statements, to normal
          year-end adjustments and except, as permitted by Form
          10-Q of the Commission) in each case in accordance with
          GAAP applied on a consistent basis throughout the periods
          covered (except as stated therein or in the notes
          thereto) and in compliance with the rules and regulations
          of the Commission.

               Section 4.5.  Absence of Certain Changes.
          Except for transactions contemplated by the Transaction
          Agreements or as disclosed in the Investor SEC Reports or
          as set forth in Schedule 4.5, since December 31, 1996
          there have not been any changes, conditions, occurrences,
          circumstances or other events that have had or would
          reasonably be expected to have a material adverse effect
          on the financial condition of the Investor and its
          Subsidiaries, taken as a whole.

                    Section 4.6.  Purchase for Purpose of
          Investment. The Investor (or its permitted designee) is
          acquiring the Shares under this Agreement for its own
          account solely for the purpose of investment and not with
          a view to, or for sale in connection with, any
          distribution thereof in violation of the Securities Act.
          The Investor acknowledges that the shares of Series A
          Convertible Preferred Stock to be acquired by it or any
          other member of the Investor Group have not been
          registered under the Securities Act and may be sold or
          disposed of in the absence of such registration only
          pursuant to any exemption from such registration and in
          accordance with the terms of the Transaction Agreements.
          Neither the Investor nor any other member of the Investor
          Group Beneficially Owns any Voting Securities.

                                  SECTION 5

                                  GOVERNANCE

                    Section 5.1.  Directors Designated by the
          Shareholder. (a) Immediately following the Closing, the
          Board shall appoint as additional Directors the two (2)
          Investor Nominees (as defined in Section 5.1(b) below)
          who have been designated by the Investor in the Investor
          Nominee Notice (as defined in Section 5.1(b) below)
          attached as Exhibit D hereto (the "Initial Investor
          Nominee Notice"). One Investor Nominee shall be placed in
          the class of Directors next standing for election, and
          the remaining Investor Nominee shall be placed in the
          class of Directors next but one standing for election. In
          addition, if at any time following the annual meeting of
          shareholders to be held in January 1999, the number of
          members constituting the entire Board of Directors shall
          equal or exceed 15, including the Investor Nominees
          appointed pursuant to the previous sentence, the Investor
          shall be entitled to designate pursuant to an Investor
          Nominee Notice, and the Board shall appoint to the Board,
          an additional Investor Nominee in accordance with the
          provisions of this Section 5, provided that, for purposes
          of this sentence (but not for purposes of requiring the
          resignation of any Investor Nominee pursuant to Section
          5.2(w)), the number of directors constituting the entire
          Board of Directors at any time after the annual meeting
          of shareholders to be held in January 2000 shall exclude
          any Director who has advised (and not withdrawn) the
          Company of his or her intention, or would be scheduled
          pursuant to the policies of the Company, to retire or
          resign from the Board within 12 months of the date as of
          which the determination pursuant to this sentence is
          being made; provided, further, that no such Director
          shall be excluded for purposes of determining the number
          of directors constituting the entire Board for a period
          of greater than 12 consecutive months until he or she no
          longer serves as a member of the Board. Any such
          additional Investor Nominee shall be placed in the class
          of Directors which does not include an Investor Nominee.
          In the event of a vacancy caused by the disqualification,
          removal, resignation or other cessation of service of any
          Investor Nominee from the Board, the Board shall elect as
          a Director (to serve until the Company's immediately
          succeeding annual meeting of shareholders) a new Investor
          Nominee who has been designated by the Investor in an
          additional Investor Nominee Notice that has been provided
          to the Company at least seven (7) days prior the date of
          a regular meeting of the Board. The Investor shall
          nominate each Investor Nominee pursuant to an additional
          Investor Nominee Notice in advance of each meeting of
          shareholders at which such Investor Nominee is to be
          elected.

                    (b) The Investor shall provide notice to the
          Company (the "Investor Nominee Notice") as required by
          Section 5.1(a) above for each Investor Nominee, which
          notice shall contain the following information: (i) the
          name of the person(s) it has designated to become
          Director(s) (the "Investor Nominees"), and (ii) all
          information required by Regulation 14A and Schedule 14A
          under the Exchange Act with respect to each such Investor
          Nominee. Subject to Section 5.1(c) below, (x) if there
          shall be two or fewer Investor Nominees, such Investor
          Nominees may be any person designated by the Investor,
          including persons who are officers, directors or
          employees of the Investor; and (y) if there shall be
          three Investor Nominees, two of such Investor Nominees
          may be persons described in clause (x) above and one
          Investor Nominee shall be an Independent Director.

                    (c) Any proposed Investor Nominee shall be a
          person acceptable to the Board in its reasonable
          discretion prior to the initial appointment, or election,
          as the case may be of each Investor Nominee to the Board;
          provided, that at any time (i) any of the five most
          senior executives of the Investor (as determined by the
          Investor in its reasonable discretion) and (ii) the head
          of the Investor's Agricultural Products business, so long
          as (subject to the following proviso) such business is
          owned by the Investor or a Subsidiary of the Investor,
          each shall be conclusively deemed to be acceptable to the
          Board for purposes of this Section 5.1(c); and provided,
          further, that once an Investor Nominee is accepted by, or
          deemed acceptable to, the Board, such person shall
          thereafter be conclusively deemed to be acceptable
          pursuant to this Agreement (together with such persons
          specified in the foregoing clauses (i) and (ii), the
          "Pre-Approved Persons"). Any objection by the Company to
          a proposed Investor Nominee must be made no later than
          five Business Days after the Investor delivers the
          applicable Investor Nominee Notice for the proposed
          Investor Nominee; provided, however, that the Company
          shall in all cases notify the Investor of any such
          objection sufficiently in advance of the date on which
          proxy materials are mailed by the Company in connection
          with such election of directors to enable the Investor to
          propose an alternate Investor Nominee pursuant to and in
          accordance with the terms of this Agreement.

                    (d) The Company agrees, subject to Section
          5.1(c) above and Section 5.2 below, to include such
          Investor Nominee to be added to or retained on the Board
          pursuant to this Agreement in the slate of nominees
          recommended by the Board to the Company's shareholders
          for election as Directors and shall use its reasonable
          efforts to cause the election or reelection of each such
          Investor Nominee to the Board at each meeting of
          shareholders at which such Investor Nominee is up for
          election, including soliciting proxies in favor of the
          election of such persons, it being understood that
          efforts consistent with those used for other members of
          the slate recommended by the Board shall be deemed
          reasonable. In the event that, notwithstanding the
          provisions of this Section 5.1(d), any one or more
          Investor Nominees is not elected to the Board then, at
          the written request of the Investor made within 30 days
          after the date of the shareholder meeting at which such
          Investor Nominee was not elected, either, as directed by
          the Investor, (a) the Company shall promptly call a
          special meeting of the Company's shareholders proposing
          the election of such Investor Nominees not elected to the
          Board or an alternative Investor Nominee as may be
          designated by the Investor in accordance with Section 5.1
          and in connection with such special meeting shall use its
          reasonable efforts to cause the election of such Investor
          Nominees by the shareholders of the Company, including
          recommending the election of such Investor Nominees and
          soliciting proxies in favor of the election of such
          Investor Nominees by the shareholders of the Company; or
          (b) the Company shall appoint another individual selected
          by the Investor, who shall be a Fully Independent
          Director and shall otherwise qualify under Section
          5.1(c), as an additional Director of the Company who
          shall serve for a term co-extensive with the term such
          Investor Nominee would have served if such Investor
          Nominee had been elected (provided that the Investor
          shall cause such additional Director to resign at such
          time as an Investor Nominee is elected to the Board seat
          that would have been held by the Investor Nominee whose
          failure to be elected triggered the Investor's right to
          designate such additional Director). In connection with
          the expiration of the term of office of any Fully
          Independent Director appointed in accordance with the
          foregoing clause (b), the Investor shall be free to
          designate an Investor Nominee in accordance with this
          Section 5.1 to replace such Fully Independent Director.
          In the event the Investor elects to call a special
          meeting of stockholders pursuant to clause (a), the
          Company shall, until such time as the Investor Nominee
          being proposed by the Investor is elected to the Board,
          invite such Investor Nominee who was not elected to the
          Board to attend meetings of the Board as an observer and
          the Company shall afford to such Investor Nominee, on as
          nearly equivalent basis as is possible (other than the
          right to vote) as would have been the case if such
          Investor Nominee had been elected to the Board, the
          opportunity to meaningfully participate in, express views
          with respect to and have influence on the deliberations
          of the Board, including through receipt, at the same time
          as the Board receives the same, of all information and
          material as is distributed to the Board. Notwithstanding
          the foregoing, if at any time as a result of the failure
          of all Investor Nominees designated by the Investor who
          are not Independent Directors or Fully Independent
          Directors to be elected to the Board as provided in this
          Section 5.1, the Investor Nominees shall consist entirely
          of Independent Directors and Fully Independent Directors,
          the Investor shall be entitled to designate one
          individual who is an officer, employee or director of the
          Investor and who qualifies as an Investor Nominee under
          Section 5.1(c) to serve as an observer at the meetings of
          the Board in accordance with the foregoing sentence until
          such time as an Investor Nominee designated by the
          Investor who is not an Independent Director or a Fully
          Independent Director shall be elected by the shareholders
          of the Company to the Board provided that the foregoing
          right to designate an observer shall not apply if the
          Investor shall have (without being required by this
          Agreement to do so) designated for election to the Board
          pursuant to Section 5.1(a) only Investor Nominees who
          were Independent Directors or a Fully Independent
          Director. If the Board of Directors shall cease to be a
          classified board, the Investor shall be entitled to
          present to the Board of Directors or the Nominating
          Committee thereof the full number of Investor Nominees
          for election to the Board of Directors at each annual
          meeting of shareholders of the Company contemplated by
          paragraph (a) above (without regard to the provisions
          regarding classes of directors contained therein). At the
          direction of the Investor, the Company shall use
          reasonable efforts to cause the removal from the Board of
          Directors of any Investor Nominee (other than an
          Independent Director or Fully Independent Director).

                    (e) The Investor agrees, to the extent required
          by Iowa law, to cause the Investor Nominees to comply
          with the standards for recusal from Board meetings
          applicable to all members of the Board. Except for any
          Investor Nominee who is an Independent Director or a
          Fully Independent Director, the Investor acknowledges
          that the Investor Nominees to the Board will not be
          entitled to receive any compensation as directors.

                    Section 5.2.  Resignation of Investor Nominees.
          Unless otherwise agreed by the Company, (w) at any time
          that there are three Investor Nominees serving on the
          Board, the Investor shall cause one of the Investor
          Nominees then serving on the Board to offer his or her
          resignation from the Board immediately upon the number of
          directors constituting the entire Board constituting 15
          or fewer, (x) the Investor shall cause all of the
          Investor Nominees then serving on the Board to offer
          their resignations from the Board immediately upon either
          (i) at any time after the Initial Top-Up Period the
          Investor Group's Total Ownership Percentage falls below
          10% for twelve consecutive months (subject to extension
          by the number of days equal to the period of time
          purchases by the Investor Group would be prohibited by
          Section 6.7(b)(iv) or Section 6.7(d)) or (ii) the
          Ownership Cap is at any time less than 10%; (y) the
          Investor shall cause Investor Nominees then serving on
          the Board to offer his or her resignations from the Board
          immediately upon the Ownership Cap at any time being less
          than 18%, so that the total number of Investor Nominees
          does not exceed 2 at any time thereafter; and (z) the
          Investor shall cause all of the Investor Nominees then
          serving on the Board to offer their resignations from the
          Board immediately upon the occurrence of a Trigger Event
          or a Release Event; provided, however, that in the event
          that the Investor Group's Total Ownership Percentage is
          less than the 10% amount referred to in clause (x)(i) of
          this Section 5.2 and would not be so but for the issuance
          of capital stock by the Company during, or within one
          month prior to, the twelve month period referred to in
          clause (x)(i) of this Section 5.2, such twelve month
          period shall be extended by an additional six months to
          eighteen consecutive months. To effectuate the
          resignations provided for in this Section 5.2, the
          Investor shall cause each Investor Nominee to provide the
          Investor with a letter of resignation upon such Investor
          Nominee's election to the Board which may be used by the
          Investor at any time.

                    Section 5.3.  Committees. The Board will not
          establish an executive committee authorized to exercise
          the power of the Board generally unless the Investor is
          granted representation on such committee proportional to
          its representation on the Board, nor will the Board
          establish or employ committees (unless the Investor is
          granted proportional representation thereon) as a means
          designed to circumvent or having the effect of
          circumventing the rights of the Investor under this
          Agreement to representation on the Board.

                                  SECTION 6

                            ADDITIONAL AGREEMENTS

                    Section 6.1.  Standstill Agreement.

                    (A) During the Standstill Period, and, if this
          Agreement is terminated prior to Closing pursuant to
          Section 10.1(a), for the one year period after the end of
          the Standstill Period (such one year period, the "Post
          Termination Standstill Period"), unless the Company shall
          have materially breached its obligation to nominate
          Investor Nominees or to appoint any Fully Independent
          Director pursuant to Section 5 (provided that, with
          respect to any such material breach that does not concern
          a Pre-Approved Person, a court of competent jurisdiction
          shall have determined pursuant to a final non-appealable
          order that the Company has so materially breached its
          obligations), the Investor shall not, shall cause each
          other member of the Investor Group not to, and shall use
          reasonable commercial efforts to cause other Affiliates
          and Associates of the Investor not members of the
          Investor Group ("Other Investor Affiliates") not to,
          directly or indirectly, alone or in concert with others:

                    (a) acquire, offer or propose to acquire or
          agree to acquire, whether by purchase, tender or exchange offer,
          through the acquisition of control of another person, by
          joining a partnership, limited partnership, syndicate or
          other 13D Group or otherwise, Beneficial Ownership of any
          Voting Securities, Derivative Securities or any other
          securities of the Company or any rights to acquire
          (whether currently, upon lapse of time, following the
          satisfaction of any conditions, upon the occurrence of
          any event or any combination of the foregoing) any Voting
          Securities, other than (i) the purchase of Shares or
          other Voting Securities expressly permitted by this
          Agreement, (ii) the acquisition of Voting Securities as a
          result of any stock split, stock dividends or other
          distributions, recapitalizations or offerings made
          available by the Company to holders of Voting Securities
          generally or (iii) in a transaction in which the Investor
          or a Subsidiary of the Investor acquires a previously
          unaffiliated business entity that, to the knowledge of
          the Investor after reasonable inquiry, owns shares of
          Common Stock that represents less than 4% of the
          Company's outstanding Common Stock and less than 10% of
          the unaffiliated entity's assets; provided, that all such
          Voting Securities shall be subject to the terms of this
          Agreement; provided, further, however, that in the event
          of a transaction as contemplated by clause (iii) hereof,
          the Investor will transfer, or cause such Subsidiary to
          transfer, in a manner consistent with Section 6.3, such
          shares of Common Stock previously owned by the
          unaffiliated entity within twelve months following the
          consummation of such transaction and all such shares of
          Common Stock, pending their transfer, shall be voted by
          the Investor or such Subsidiary in accordance with the
          requirements of clauses (w) through (z) of Section 6.2
          and on any other matter in the same proportion as the
          votes cast by or on behalf of all holders of the
          Company's Voting Securities other than the Investor Group
          and Other Investor Affiliates;

                    (b) propose or seek to effect any merger,
          business combination, restructuring, recapitalization or
          similar transaction involving the Company or any of its
          Subsidiaries or the sale or other disposition outside the
          ordinary course of business of any material portion of
          the assets of the Company or any of its Subsidiaries
          except pursuant to Section 8.2 hereof;

                    (c) deposit any Voting Securities in a voting
          trust or subject any Voting Securities to any arrangement
          or agreement with respect to the voting of such Voting
          Securities except pursuant to Section 8.8 hereof;

                    (d) seek election to, seek to place a
          representative on, or seek the removal of any member of,
          the Board, except pursuant to Section 5 hereof;

                    (e) engage in any "solicitation" (within the
          meaning of rule 14a-1 under the Exchange Act) of proxies
          or consents (whether or not relating to the election or
          removal of directors) with respect to the Company, or
          become a "participant" in any "election contest" (within
          the meaning of Rule 14a-11 under the Exchange Act) or,
          unless the execution by the Investor, member of the
          Investor Group or Other Investor Affiliate is first
          approved by the Board, execute any written consent in
          lieu of a meeting of the holders of any class of Voting
          Securities that is solicited by or on behalf of any
          shareholder of the Company;

                    (f) call or seek to have called any meeting of
          the shareholders of the Company (except for the exercise
          by the Investor of its rights pursuant to Section
          5.1(d));

                    (g) initiate, propose or otherwise solicit
          shareholders for the approval of any shareholder proposal
          (as described in Rule 14a-8 under the Exchange Act or
          otherwise) with respect to the Company;

                    (h) form, join or in any way participate in or
          assist in the formation of a 13D Group with respect to
          any Voting Securities, other than any such "group"
          consisting exclusively of the Investor and other
          wholly-owned United States Subsidiaries of the Investor
          who have acquired Voting Securities in accordance with
          Section 2.2(b) or Section 6.3(a);

                    (i) otherwise act, alone or in concert with
          others, to seek control or influence the management, the
          Board or the policies of the Company in a manner designed
          or having the deliberate effect of circumventing the
          restrictions otherwise imposed under this Section 6.1(A);

                    (j) disclose or publicly announce any
          intention, plan or arrangement inconsistent with the
          foregoing;

                    (k) advise, assist or encourage or finance any
          other persons in connection with any of the foregoing
          types of activities; or

                    (l) request the Company (or its directors,
          officers, employees or agents) to amend or waive any
          provision of this Agreement;

          provided that nothing in this Section 6.1(A) shall limit
          any rights of the members of the Investor Group under the
          Joint Venture Agreement or the Research Alliance
          Agreement, or (I) prohibit any individual who is serving
          as a Director of the Company, solely in his or her
          capacity as such Director and provided no public
          disclosure thereof by the Company would be required, from
          (x) taking any action or making any statement at any
          meeting of the Board of Directors or of any committee
          thereof, (y) making any statement to any Representative
          of the Company, or (z) making any statement or disclosure
          required under federal securities laws or other
          applicable Law, (II) restrict any private communications
          not requiring public disclosure between the Investor and
          any Investor Nominee, (III) restrict any disclosure or
          statements required to be made by any member of the
          Investor Group under applicable Law to the extent any
          such requirement does not arise from actions by the
          Investor Group inconsistent with this Agreement, or (IV)
          limit the rights of the Investor Group pursuant to
          Section 6.2, Section 6.9 or Section 8.2.

                    (B) Notwithstanding the foregoing, if this
          Agreement is terminated prior to Closing pursuant to
          Section 10.1(a), the provisions of paragraph (A) of this
          Section 6.1 (other than the provisions of clauses (a)
          (except as to proposals to the Company as to the matters
          in clause (b)) and (h) thereof and the provisions of (i),
          (j), (k) and (l) thereof to the extent such provisions
          relate to the acquisition of Voting Securities or other
          securities of the Company) shall cease to apply during
          the Post-Termination Standstill Period if (i) the Company
          enters into an agreement contemplating a Change in
          Control Transaction or a Competing Investment or the
          Company makes any filing with respect to, or seeks
          expiration of the waiting period under, the HSR Act with
          respect to a Change in Control Transaction or Competing
          Investment; (ii) the Board of Directors publicly
          announces its intention to solicit or publicly solicits
          any Proposal or publicly approves, accepts, authorizes or
          recommends to shareholders of the Company their approval
          of or the conveyance of shares pursuant to a Change in
          Control Transaction or Competing Investment; (iii) during
          or prior to the pendency of a bona fide tender or
          exchange offer made by any Person or 13D Group (other
          than a member of the Investor Group), the Board of
          Directors determines or resolves to, or announces its
          intention to, or is ordered or directed by any
          Governmental Entity to, redeem, amend or modify (to
          render inapplicable (including by taking action to cause
          a Section 11(a)(ii) Event or Section 13 Event (each as
          defined in the Amended Rights Agreement as in effect on
          the date hereof), not to occur that, absent such action,
          would otherwise have occurred, or to redeem the Preferred
          Stock Purchase Rights) thereto or otherwise exempt
          therefrom) the Preferred Stock Purchase Rights or the
          Amended Rights Agreement (or a Substantially Similar
          Agreement) or; (iv) any Person other than the Investor or
          an Excluded Person acquires or agrees to acquire 20% or
          more of the then outstanding Voting Securities or Common
          Securities.

                    Section 6.2.  Voting. (a)  At all times during
          the Standstill Period, the Investor shall, shall cause
          each other member of the Investor Group to, and shall use
          its commercially reasonable efforts to cause each Other
          Investor Affiliate to, vote all Voting Securities which
          they Beneficially Own, at any shareholder meeting or in
          connection with any action by written consent at or in
          which such Voting Securities are entitled to vote, (w) in
          favor of the slate of nominees (including any Investor
          Nominee to be included in such slate in accordance with
          Section 5) proposed by the Board; provided, that any
          Investor Nominee nominated by the Investor for inclusion
          in such slate pursuant to Section 5.1 is so included, (x)
          in favor of any amendment to the Company's Articles of
          Incorporation proposed by the Board to change the voting
          rights of the Common Stock to one vote per share of
          Common Stock (a "Voting Amendment"), (y) in favor of the
          Reclassification Amendment at each meeting of the
          Company's shareholders at which the Reclassification
          Amendment is submitted for approval of the Company's
          shareholders, and (z) on any matter relating to the
          adoption of any stock option, stock purchase or other
          benefit or compensation plan for employees, executives or
          directors of the Company, and on any non-Company
          sponsored shareholder proposal which is opposed by the
          Company, in accordance with the direction of the Board as
          to how such Voting Securities shall be voted, except that
          during any period or at any time when there shall be in
          full force and effect a valid order or judgment of a
          court of competent jurisdiction or a ruling,
          pronouncement or requirement of the NYSE to the effect
          that the foregoing provisions of this Section 6.2 are
          invalid, void, unenforceable or not in accordance with
          NYSE policy, then the Investor will, if so requested by
          the Board, vote or cause (or, in the case of the Other
          Investor Affiliates, use its commercially reasonable
          efforts to cause) to be voted all of the Voting
          Securities beneficially owned by it, the Investor Group
          and the Other Investor in the same proportion as the
          votes cast by or on behalf of the other holders of the
          Company's Voting Securities other than the Investor Group
          and Other Investor Affiliates, but only with respect to
          the foregoing matters. On all other matters the Investor,
          the members of the Investor Group and the Other Investor
          Affiliates shall be entitled to vote the Voting
          Securities held by them in their discretion; provided,
          that at any meeting at which a quorum would not be
          present but for the inclusion of the Voting Securities
          Beneficially Owned by the Investor Group, the Investor
          shall cause such Voting Securities to be voted with
          respect to each of the matters presented to shareholders
          at such meeting and such vote shall be in accordance with
          the foregoing provisions of this Section 6.2(a). At all
          times during the Standstill Period, the Investor shall
          be, shall cause each other member of the Investor Group
          to be, and shall use its commercially reasonable efforts
          to cause each Other Investor Affiliate to be, as the
          Beneficial Owners of Voting Securities, present, in
          person or by proxy, at all meetings of shareholders of
          the Company, so that all Voting Securities which
          Investors or any other member of the Investor Group or
          any Other Investor Affiliate Beneficially Owns may be
          counted for the purpose of determining the presence of a
          quorum at all meetings of shareholders of the Company.

                    (b) If the holders of the outstanding shares of
          Common Stock are entitled to vote as a separate class or
          voting group under the Articles of Incorporation or the
          corporation laws of the Company's jurisdiction of
          incorporation on any matter on which a shareholder vote
          is otherwise required, then the Company hereby covenants
          and agrees that if the Investor advises the Company in
          writing prior to the meeting held (or the record date for
          action taken by written consent in lieu of a meeting) to
          approve such matter that the Investor opposes such matter
          so to be voted upon by such class or voting group, then
          it shall be a condition to the effectiveness of the
          matter to be voted on that the matter be approved by an
          aggregate number of Votes that would have been sufficient
          to approve such matter under the Articles of
          Incorporation and the corporation laws of the Company's
          jurisdiction of incorporation if all the Votes that could
          have been voted by the Investor Group had such class or
          voting group included the Voting Power represented by the
          Series A Convertible Preferred Stock held by the Investor
          Group been included in such class or voting group and
          cast against the approval of such matter.

                    (c)  To the full extent permitted by Iowa law,
          the Investor hereby waives, shall cause each member of
          the Investor Group to waive, and shall use its
          commercially reasonable efforts to cause each Other
          Investor Affiliate to waive, any rights that the
          Investor, any member of the Investor Group or any Other
          Investor Affiliate, as the case may be, may have or
          hereafter acquire under Division XIII of the Iowa
          Business Corporation Act with respect to any disposition
          of Voting Securities pursuant to this Agreement.

                    (d)  At any time after the conversion of the
          Series A Convertible Preferred Stock into Common Stock
          pursuant to Section 6(a)(ii) of the Certificate of
          Designation for the Series A Convertible Preferred Stock,
          the Investor will cause all Votes attributable to any
          shares of Common Stock thereafter owned by the Investor
          Group and acquired prior to the termination of this
          Agreement to be voted (a) with respect to a number of
          Votes representing no more than voting power equal to the
          Investor Group's Total Ownership Percentage at such time,
          during the Standstill Period, in accordance with the
          provisions of Section 6.2(a) and after the Standstill
          Period, in the sole discretion of the Investor, and (b)
          with respect to all other Votes, on any matter pro rata
          in accordance with the Votes voted on such matter by all
          holders of Voting Securities other than the Investor
          Group and Other Investor Affiliates.

                    (e) Notwithstanding the foregoing provisions of
          this Section 6.2, at any time following the occurrence of
          a Trigger Event or a Release Event, the Investor shall,
          shall cause each other member of the Investor Group to,
          and shall use its commercially reasonable efforts to
          cause each Other Investor Affiliate to vote all Voting
          Securities which they Beneficially Own, (i) in favor of
          the slate of nominees proposed by the Board (except that
          during any period or at any time when there shall be in
          full force and effect a valid order or judgment of a
          court of competent jurisdiction or a ruling,
          pronouncement or requirement of the NYSE to the effect
          that the foregoing provisions of this Section 6.2(e) are
          invalid, void, unenforceable or not in accordance with
          NYSE policy, in which case, the Investor will, if so
          requested by the Board, vote or cause to be voted all of
          its Voting Securities Beneficially Owned by it and the
          other members of the Investor Group, and use commercially
          reasonable efforts to cause all Voting Securities
          Beneficially Owned by Other Investor Affiliates to be
          voted, for the election of directors in the same
          proportion as the votes cast by or on behalf of the other
          holders of the Company's Voting Securities other than the
          Investor Group and Other Investor Affiliates) and (ii) on
          all other matters at any shareholder meeting or in
          connection with any action by written consent, in the
          same proportion as the votes cast by or on behalf of all
          holders of the Company's Voting Securities other than the
          Investor Group and Other Investor Affiliates.

                    Section 6.3.  Dispositions. During the
          Standstill Period and thereafter in perpetuity in the
          case of clauses (f) and (g) hereof to the extent
          specified therein, the Investor shall not, shall cause
          each other member of the Investor Group not to, and shall
          use its commercially reasonable efforts to cause each
          Other Investor Affiliate not to, directly or indirectly
          (including, without limitation, through the disposition
          or transfer of any equity interest in another Person),
          sell, assign, transfer, pledge, hypothecate, grant any
          option with respect to or otherwise dispose of any
          interest in (or enter into an agreement or understanding
          with respect to the foregoing) any Voting Securities (a
          "Disposition"), except as set forth below in this Section
          6.3.

                    (a) Dispositions may be made to wholly-owned
          United States Subsidiaries of the Investor; provided,
          that such Subsidiaries agree in writing to be bound by
          this Agreement to the same extent as the Investor and
          such Subsidiaries at all times remain wholly-owned United
          States Subsidiaries of the Investor.

                    (b) Dispositions of Voting Securities may be
          made to Persons other than members of the Investor Group
          and Other Investor Affiliate pursuant to (i) a bona fide
          public offering effected in accordance with the
          Registration Rights Agreement, (ii) in bona fide open
          market "brokers' transactions" as permitted by the
          provisions of Rule 144 as currently promulgated under the
          Securities Act (other than pursuant to the provisions of
          clause (k) thereof) and subject to the requirement that
          the amount of Voting Securities sold may not exceed the
          lesser of the amounts specified under clauses (i) and
          (ii) of paragraph (e)(1) of Rule 144 as currently in
          effect, (iii) in privately-negotiated transactions to (A)
          any Person specified in Rule 13d-1(b)(1)(ii) promulgated
          under the Exchange Act who would be eligible based on
          such person's status and passive intent with respect to
          the ownership, holding and voting of such Voting
          Securities to report such person's ownership of such
          Voting Securities (assuming such person owned a
          sufficient number of such Voting Securities to require
          such filing) on Schedule 13G or (B) any other Person, and
          (iv) pursuant to a pro rata dividend to the stockholders
          of the Investor, provided, however, that:

                    (I) Dispositions shall not be made pursuant to
          clauses (i), (ii), (iii)(A) or (iv) of this Section
          6.3(b) if, (A) in the case of Dispositions pursuant to
          clauses (i), (ii) and (iii)(A) of this Section 6.3(b),
          any Person (other than any underwriter who is in the
          business of underwriting securities and who, in the
          ordinary course of its business as an underwriter,
          acquired Common Securities in connection with a public
          offering with the bona fide intention of reselling all of
          the Common Securities so acquired pursuant to such public
          offering (a "Permitted Underwriter")) to whom the
          Disposition in question is made would, to the actual
          knowledge of the Investor (without any duty of inquiry)
          in the case of Dispositions pursuant to clause (ii) of
          Section 6.3(b), and to the knowledge of the Investor,
          after reasonable inquiry, in all other cases after giving
          effect to such Disposition, together with such Person's
          Affiliates and Associates and the members of any 13D
          Group existing with respect to Voting Securities of which
          such Person is a part (any such Person and its
          Affiliates, Associates and 13D Group members being
          collectively referred to herein as a "Purchasing
          Person"), Beneficially Own Voting Securities representing
          more than 3% (or 5% in the case of clause (iii)(A)), as
          the case may be (or, in any such case, 1% if any Person
          included in a Purchasing Person is a Pioneer Competitor)
          of the Total Voting Power or Total Ownership Percentage
          then outstanding, (B) in the case of Dispositions
          pursuant to clauses (ii) and (iii)(A) of this Section
          6.3(b), the Investor Group shall have complied with the
          provisions of Section 6.4 and the Company shall have had
          the right to purchase pursuant to Section 6.4 the Voting
          Securities subject to such Disposition; or (C) in the
          case of a Disposition pursuant to clause (iv) of this
          Section 6.3(b), any shareholder receives in such dividend
          more than 2% of the Total Voting Power or Total Ownership
          Percentage, unless such shareholder shall have executed
          and delivered a Purchaser Standstill Agreement (as
          defined below) pursuant to which such shareholder agrees
          to be bound by Section 6 of this Agreement (other than
          Section 6.6(b), Section 6.7 and Section 6.9 hereof) to
          the same extent as the Investor as if references to the
          Investor in such Section were to such shareholder with an
          Ownership Cap equal to its then current ownership
          provided that for purposes of Section 6.6(a) only the
          Ownership Cap of such shareholder shall be 5%; provided,
          however, that in no event shall any disposition be made
          pursuant to such clause (iv) if any shareholder would be
          entitled to receive in connection therewith 7.5% (or 2%
          if such shareholder is a Pioneer Competitor) or more of
          the Total Voting Power or Total Ownership Percentage;

                    (II) Dispositions shall not be made pursuant to
          clauses (iii)(B) of this Section 6.3(b) if the Purchasing
          Person would, to the knowledge of the Investor, after
          reasonable inquiry, after giving effect to the
          Disposition, Beneficially Own Voting Securities
          representing more than 5% (or 1% if any Person included
          in the Purchasing Person is a Pioneer Competitor) of the
          Total Voting Power or Total Ownership Percentage then
          outstanding, provided that if any such Purchasing Person
          would, to the knowledge of the Investor, after reasonable
          inquiry, after giving effect to such Disposition,
          Beneficially Own Voting Securities representing more than
          3% of the Total Voting Power or Total Ownership
          Percentage then outstanding, (x) the Investor Group
          shall, in the case of Dispositions pursuant to clause
          (iii)(B) of this Section 6.3(b), have complied with the
          provisions of Section 6.4 and the Company shall have had
          the right to purchase pursuant to Section 6.4 the Voting
          Securities subject to the Disposition, and (y) the
          Purchasing Person shall have executed and delivered to
          the Company a written agreement (which agreement shall be
          addressed to the Company and reasonably satisfactory in
          form and substance to the Company) (a "Purchaser
          Standstill Agreement") of each such Purchasing Person to
          be bound by Section 6 of this Agreement (other than
          Section 6.6(b), Section 6.7 and Section 6.9 hereof) to
          the same extent as the Investor as if references to the
          Investor in such Section were to such Purchasing Person
          with an Ownership Cap equal to its then current ownership
          provided that for purposes of Section 6.6(a) only the
          Ownership Cap of such Purchasing Person shall be 5%; and

                    (III) No Disposition pursuant to this Section
          6.3(b) (other than pursuant to Section 6.3(b)(iv)) shall
          be effected prior to the third anniversary of the Closing
          Date, unless the Investor Group is required to make a
          Disposition pursuant to the last proviso to Section
          6.1(A)(a)(iii) or Section 6.6 hereof, nor shall any
          Disposition be made (other than pursuant to Section
          6.3(b)(i)) if such Disposition would constitute a
          distribution in violation of Regulation M under the
          Securities Act by reason of any repurchase program of the
          Company then announced.

                    (c) Dispositions may be made to the Company in
          accordance with Sections 6.4 through 6.6 hereof.

                    (d) Dispositions may be made pursuant to a
          tender offer or exchange offer (or, during the pendency
          thereof pursuant to Section 6.3(b)(iii)(A) or in open
          market transactions permitted under Section 6.3(b)(ii)
          and, in each case, subject to the restrictions of clause
          (I)(A) thereof but not subject to clause (I)(B) thereof)
          or any other transaction (x) which is recommended to
          shareholders of the Company by the Board of Directors
          (or, in the case of a tender or exchange offer, which is
          not within 10 Business Days of the commencement thereof
          opposed by the Board of Directors or, in the case of an
          Unsolicited Offer which is opposed, in the event such
          opposition is thereafter withdrawn by the vote of the
          Board of Directors) or (y) in the case of a merger or
          other business combination transaction, which has been
          approved by the shareholders of the Company (including
          approval without a meeting pursuant to the short-form
          merger provisions of the Iowa Business Corporation Act)
          in a manner so as to be legally binding on all
          shareholders of the Company and so as to require the
          disposition by such shareholders of their shares pursuant
          to such merger or other business combination transaction
          (without regard to this Agreement); and

                    (e) Dispositions may be made pursuant to a
          tender offer or exchange offer which is not recommended
          by a majority of the entire Board (an "Unsolicited
          Offer"); provided that such Unsolicited Offer is for at
          least a majority of the Common Stock outstanding on a
          fully diluted basis; and provided further, (i) if the
          Amended Rights Agreement (or a Substantially Similar
          Plan) was in effect prior to the commencement of such
          Unsolicited Offer, the Company has redeemed the Rights
          (as defined in the Amended Rights Agreement) or otherwise
          amended or modified the Amended Rights Agreement (or a
          Substantially Similar Plan) to be inapplicable (including
          by taking action to cause a Section 11(a)(ii) Event or
          Section 13 Event (each as defined in the Amended Rights
          Agreement as in effect on the date hereof), not to occur
          that, absent such action, would otherwise have occurred,
          or to redeem the Preferred Stock Purchase Rights) to such
          Unsolicited Offer or otherwise taken any Board action
          pursuant to the Amended Rights Agreement (or a
          Substantially Similar Plan) in order to permit the
          Unsolicited Offer to be consummated without causing a
          Triggering Event (as defined in the Amended Rights
          Agreement) to occur and (ii) in any event, the Investor
          and each member of the Investor Group shall have complied
          with the provisions of Section 6.5 and the Company shall
          have had the right pursuant to Section 6.5 to purchase
          the Voting Securities subject to such Disposition.

                    (f) At any time subsequent to the Standstill
          Period, the Investor shall not, shall cause each other
          member of the Investor Group not to, and shall use its
          commercially reasonable efforts to cause each Other
          Investor Affiliate not to, directly or indirectly, effect
          any Disposition of Voting Securities if, to the knowledge
          of the Investor, such member of the Investor Group or
          such Other Investor Affiliate, after reasonable inquiry,
          the Purchasing Person (other than a Permitted Underwriter
          and broker-dealers acting in connection with a block
          trade in which no Person or 13D Group acquires Voting
          Securities representing an Equity Percentage of more than
          5%) would, after giving effect to such Disposition,
          Beneficially Own Voting Securities representing more than
          5% of the Total Voting Power or Total Ownership
          Percentage then outstanding; provided, however, that the
          foregoing restrictions shall not be applicable to any
          Disposition in connection with a tender or exchange offer
          or a merger, business combination or other extraordinary
          transaction.

                    (g) Notwithstanding the foregoing, at any time
          subsequent to (i) the consummation of a Surviving Change
          in Control Transaction (as defined in Section 8.2(b)),
          (ii) a Release Event, or (iii) a Trigger Event, the
          provisions of Sections 6.3(a) through (c) and Section
          6.3(f) shall not apply and in lieu thereof, the Investor
          shall not, and shall cause each other member of the
          Investor Group not to, and shall use commercially
          reasonable efforts to cause each Other Investor Affiliate
          not to, directly or indirectly effect any Disposition of
          Voting Securities (a) representing an Equity Percentage
          of more than 3% to any one Person or 13D Group (other
          than a Permitted Underwriter and broker-dealers acting in
          connection with a block trade in which no Person or 13D
          Group acquires Voting Securities representing an Equity
          Percentage of more than 3%) or (b) to any Person or 13D
          Group who has filed a Schedule 13D with the Commission
          with respect to any Voting Securities issued by the
          Company; provided, however, that the foregoing
          restrictions shall not be applicable to any Disposition
          of Voting Securities in compliance with Section 6.3(d) or
          (e) and Section 6.5.

                    (h) If the Investor intends to effect a
          Disposition in accordance with this Section 6.3, it shall
          give the Company as much prior notice of such intention
          as is reasonably practicable. 

                    Section 6.4. Company's Right to Purchase Voting
          Securities. Prior to any Disposition of Voting Securities
          pursuant to clauses (ii) and (iii) of Section 6.3(b), the
          Company shall have the right, to the extent provided in
          Section 6.3(b), exercisable in accordance with this
          Section 6.4, to purchase all, but not less than all, of
          the Voting Securities intended to be subject to such
          Disposition by the Investor or any other member of the
          Investor Group.

                    (a) To the extent required by Section 6.3(b),
          if any member of the Investor Group wishes to effect any
          Disposition of Voting Securities pursuant to clauses (ii)
          and (iii) of Section 6.3(b), the Investor shall give
          notice (a "Transfer Notice") to the Company of such
          intended Disposition, specifying the Voting Securities to
          be subject to Disposition and the intended method of
          Disposition. The Transfer Notice shall specify, in the
          case of Dispositions pursuant to clauses (ii) or (iii)(A)
          of Section 6.3(b), the cash price (the "First Offer
          Price") at or above which the Investor intends to effect
          such Dispositions and, in the case of Dispositions
          pursuant to clause (iii)(B) of Section 6.3(b), the terms
          of a bona fide third party offer (a "Third Party Offer")
          to purchase such Voting Securities theretofore received
          by the Investor and then remaining open (including the
          identity of the offeror and the price offered). If the
          Company wishes to purchase the Voting Securities
          specified in the Transfer Notice, then within fifteen
          Business Days (or, in the case of any Required
          Disposition being made as a result of a Company request
          pursuant to Section 6.6, five Business Days) following
          receipt of the Transfer Notice, the Company shall deliver
          a written notice (an "Acceptance Notice") to the Investor
          indicating that the Company wishes to purchase such
          Voting Securities (such Voting Securities, the "Section
          6.4 Securities"), a date for the closing of such
          purchase, which shall not be more than 45 days after
          delivery of such Acceptance Notice (subject to extension
          as provided in Section 6.4(f) hereof), and a place for
          the closing of such purchase (a "Section 6.4 Closing").
          Upon delivery of an Acceptance Notice, a binding
          agreement shall be deemed to exist providing for the
          purchase by the Company of the Section 6.4 Securities to
          which such Acceptance Notice relates, upon the terms and
          subject to the conditions set forth in this Section 6.4
          and the Company shall use its reasonable best efforts to
          secure all approvals required in connection therewith;
          provided, that (i) the Company may rescind its Acceptance
          Notice (in which event it will have no obligation to
          purchase such Section 6.4 Securities) at any time within
          two Business Days following any determination of (x) the
          value of any untraded securities pursuant Section
          6.4(b)(ii) hereof or (y) fair market value pursuant to
          Section 6.4(b)(ii) hereof; and (ii) the Investor may
          rescind its Transfer Notice (in which event it will have
          no obligation to sell such Section 6.4 Securities) at any
          time within two Business Days following any determination
          of (a) the value of any untraded securities pursuant to
          Section 6.4(b)(ii) hereof or (y) fair market value
          pursuant to Section 6.4(b)(ii) hereof.

               (b) The purchase price for any Section 6.4
          Securities (the "Section 6.4 Price") shall be determined
          as set forth below.

                    (i) With respect to any Section 6.4 Securities
               for which  a Third Party Offer consisting of other
               than solely cash and/or  readily marketable
               securities is disclosed in the applicable Transfer
               Notice, the Section 6.4 Price per share or other
               unit of such Section 6.4 Securities (which shall
               refer, in the case of shares of Series A Convertible
               Preferred Stock that are Section 6.4 Securities, to
               the applicable number of shares of Common Stock
               issuable upon conversion of such Series A
               Convertible Preferred Stock), shall equal the
               average Market Price per share or per unit of the
               Section 6.4 Securities during the 30 consecutive
               trading days immediately preceding the Company's
               receipt of the Transfer Notice.

                    (ii)  With respect to any Section 6.4
               Securities for which a First Offer Price or a Third
               Party Offer is disclosed in the applicable Transfer
               Notice which provides for consideration  consisting
               solely of cash and/or readily marketable securities,
               the Section 6.4 Price per share or other unit of
               such Section 6.4 securities shall equal the per
               share or per unit price specified in such First
               Offer Price or Third Party Offer; provided, however,
               that, except for Acceptance Notices delivered in
               respect of a Required Disposition, in the event the
               Market Price per share or per unit on the last
               Business Day prior to the date the Acceptance Notice
               is delivered is more than 10% greater than the per
               share or per unit price specified by such First
               Offer Price or Third Party Offer, than the price per
               share or per unit shall equal the Market Price per
               share or per unit on the last Business Day prior to
               the date the Acceptance Notice is delivered. The
               value of any readily marketable securities
               identified in such Third Party Offer shall equal the
               average Market Price per share or per unit of such
               securities during the 30 consecutive trading days
               immediately preceding the Company's receipt of the
               Transfer Notice. In the case of any securities not
               theretofore traded, such securities must be issued
               or proposed to be issued by an entity which has been
               subject to the reporting requirements of the
               Exchange Act for at least one year, and the value of
               such securities shall be determined by two
               nationally recognized investment banking firms, one
               firm to be selected by each of the Investor and the
               Company, or in the event such firms are unable to
               agree, by a third nationally recognized investment
               banking firm selected by such firms. The Investor
               and the Company shall use their reasonable best
               efforts to cause any such determination of value to
               be made within five Business Days following the
               Company's receipt of the applicable Transfer Notice.
               In connection with any determination of fair market
               value pursuant to this Section 6.4(b)(ii), each
               party will bear the fees and expenses of the
               investment banking firm selected by it and the
               parties will bear equally the fees and expenses of
               any third investment banking firm.

                    (c)  At any Section 6.4 Closing, the Company
          shall pay to the Investor (or its designees) the
          aggregate Section 6.4 Price for the Section 6.4
          Securities by wire transfer of immediately available
          funds, and the Investor shall deliver or cause to be
          delivered to the Company such Section 6.4 Securities,
          with documentation satisfactory to the Company evidencing
          the transfer of such Section 6.4 Securities, in form
          acceptable for transfer on the Company's books.

                    (d)  If the Company does not exercise its right
          to purchase Voting Securities specified in a Transfer
          Notice, or if the Company exercises its right to rescind
          as described in the proviso to the last sentence of
          Section 6.4(a) hereof, or if any agreement deemed to
          exist with respect to Voting Securities upon delivery of
          an Acceptance Notice is terminated pursuant to Section
          6.4(f), then the party giving such Transfer Notice shall
          be free to effect the Disposition of such Voting
          Securities, subject to any other requirements applicable
          to such Disposition pursuant to Section 6.3; provided,
          that any such Disposition is completed within 60 days
          following the expiration of the period in which the
          Company had the right to elect to purchase such Voting
          Securities or such rescission or termination, as the case
          may be (which 60 day period may be extended day by day by
          the Investor if as of such 60th day or any day thereafter
          on which such period is extended (x) all waiting periods,
          if any, applicable to such Disposition under the HSR Act,
          shall not have expired or been terminated or (y) any
          statute, rule, regulation, executive order, decree,
          ruling, injunction or other order shall have been
          enacted, entered, promulgated or enforced by any court or
          governmental authority of competent jurisdiction which
          prohibits such Disposition or makes such Disposition
          illegal, provided that no such extension shall be for
          more than 60 days in the aggregate); provided, further,
          that such Disposition is effected in accordance with the
          intended method of Disposition described in the
          applicable Transfer Notice; provided, further, that with
          respect to any such Disposition of Voting Securities for
          which a First Offer Price or a Third Party Offer is
          disclosed in the applicable Transfer Notice, the
          Disposition of such Voting Securities is at the price
          specified therein or at any price in excess thereof (or,
          in the case of Dispositions pursuant to Section
          6.3(b)(ii) or in the case of Dispositions pursuant to
          Section 6.3(b)(iii)(A) which are being made as a result
          of the Company's request for a Required Disposition
          pursuant to Section 6.6 (a), where, in each case, the
          applicable First Offer Price per share of Common Stock
          does not exceed the average Market Price for the Common
          Stock for the three trading days immediately preceding
          the receipt by the Company of the related Transfer
          Notice, the Disposition is completed at prices in excess
          of 95% of the applicable First Offer Price) and, in the
          case of a Third Party Offer, to the transferee specified
          in the Transfer Notice. In the case of any Disposition
          pursuant to clause (iii) of Section 6.3(b), the price per
          share of Common Stock at which such Disposition is deemed
          to be effected shall (i) not have deducted therefrom any
          ordinary brokerage or placement fees, and (ii) be
          increased by the amount of any discount in purchase price
          granted to any broker-dealer in connection with such
          Disposition in lieu of any such ordinary brokerage or
          placement fees. If any such Disposition is not completed
          within the 60-day period specified in the first proviso
          of the preceding sentence, any Voting Securities
          specified in the applicable Transfer Notice and not
          disposed of in such Disposition shall again be subject to
          the restrictions on transfer set forth in Section 6.3,
          including the Company's purchase rights under this
          Section 6.4, to the extent provided in Section 6.3.

                    (e) Without limiting Section 6.3(b), if any
          Disposition is made to any Purchasing Person who is
          required to have entered into a Purchaser Standstill
          Agreement, then such person shall be deemed to have
          consented to be bound by Section 6 of this Agreement
          (other than Section 6.6(b), Section 6.7 and Section 6.9
          hereof) to the same extent as the Investor and to the
          extent of such Purchasing Person's ownership interest as
          if references to the Investor in such Section were to
          such Purchasing Person provided that for purposes of
          Section 6.6(a) only, the Ownership Cap of the Purchasing
          Person shall be 5%. 

                    (f) The obligations of the parties to effect
          any Section 6.4 Closing shall be subject to the
          satisfaction of the following conditions: (i) all waiting
          periods, if any, applicable to the transactions occurring
          at such Section 6.4 Closing under the HSR Act, shall have
          expired or been terminated and (ii) no statute, rule,
          regulation, executive order, decree, ruling, injunction
          or other order shall have been enacted, entered,
          promulgated or enforced by any court or governmental
          authority of competent jurisdiction which prohibits such
          transactions or makes such transactions illegal. If, as
          of any date on which a Section 6.4 Closing is scheduled
          to occur, the foregoing conditions relating thereto have
          not been satisfied, then such Section 6.4 Closing shall
          occur as promptly as practicable following such
          satisfaction, and the parties shall use their reasonable
          best efforts to cause the satisfaction of such
          conditions; provided that if the foregoing conditions
          relating to any Section 6.4 Closing are not satisfied
          within 120 days in the case of clause (i), and 180 days
          in the case of clause (ii), following delivery of the
          applicable Acceptance Notice (or in the case of an order
          or injunction arising out of any proceeding initiated by
          the Investor or any member of the Investor Group, such
          later date on which such order or injunction becomes
          final and nonappealable), then the Investor or the
          Company may terminate the agreement deemed to exist upon
          delivery of the applicable Acceptance Notice; provided
          that no such termination shall excuse any party for a
          breach of its obligations thereunder.

                    Section 6.5.  Company's Right to Purchase
          Voting Securities in Case of Unsolicited Offer. Prior to
          any Disposition of Voting Securities pursuant to Section
          6.3(e), the Company (and/or its designees) shall have the
          right, exercisable in accordance with this Section 6.5,
          to purchase all of the Voting Securities permitted to be
          subject to such Disposition by the Investor Group.

                    (a) If any member of the Investor Group wishes
          to effect any Disposition of Voting Securities pursuant
          to Section 6.3(e), the Investor shall give notice (a
          "Section 6.5 Transfer Notice") to the Company of such
          intended Disposition at least 9 Business Days prior to
          the latest date, as provided below, on which the Company
          (and/or its designees) is entitled to exercise its right
          to purchase the Voting Securities specified in such
          Section 6.5 Transfer Notice, unless a shorter period
          after commencement of the Unsolicited Offer or a change
          in the price term thereof is provided for acceptance or
          qualification for proration, in which case the Section
          6.5 Transfer Notice shall be given promptly after
          commencement of the Unsolicited Offer or such change;
          provided that the Investor may rescind such Section 6.5
          Transfer Notice at any time prior to delivery of a
          Section 6.5 Acceptance Notice (as defined below). The
          Section 6.5 Transfer Notice shall specify the Voting
          Securities to be tendered. If the Company (and/or its
          designees) wishes to purchase the Voting Securities
          specified in the Transfer Notice, then not later than 24
          hours prior to the latest time by which such securities
          must be tendered in order to be accepted in the
          Unsolicited Offer, the Company shall deliver a written
          notice (a "Section 6.5 Acceptance Notice") to the
          Investor specifying that the Company (and/or its
          designees) wishes to purchase such Voting Securities
          (such Voting Securities, the "Section 6.5 Securities"), a
          date for the closing of such purchase, which shall not be
          more than 45 days after delivery of such Section 6.5
          Acceptance Notice (subject to extension as provided in
          Section 6.5(e) hereof), and a place for the closing of
          such purchase (a "Section 6.5 Closing"). Upon delivery of
          a Section 6.5 Acceptance Notice, a binding agreement
          shall be deemed to exist providing for the purchase by
          the Company (and/or its designees) of the Section 6.5
          Securities to which such Section 6.5 Acceptance Notice
          relates, upon the terms and subject to the conditions set
          forth in this Section 6.5 and the Company shall use its
          reasonable best efforts to secure all approvals required
          in connection therewith; provided, that if the
          Unsolicited Offer is for less than all of the outstanding
          shares of Common Stock, the Section 6.5 Securities to be
          purchased by the Company as a result of the Section 6.5
          Acceptance Notice shall equal (i) if the Section 6.5
          Closing occurs after the date of consummation of the
          applicable Unsolicited Offer, the Voting Securities
          specified in the Section 6.5 Transfer Notice that would
          have been purchased (taking into account prorationing) if
          all of such Voting Securities so specified had been
          tendered into such Unsolicited Offer and (ii) otherwise,
          the Voting Securities specified in the Section 6.5
          Transfer Notice that would have been so purchased (taking
          into account prorationing) if the party giving the
          Section 6.5 Transfer Notice had tendered such Voting
          Securities into the Unsolicited Offer, and all other
          shareholders of the Company had tendered all their Voting
          Securities into the Unsolicited Offer; and, provided,
          further, that if following delivery of a Section 6.5
          Acceptance Notice, the price per share of Common Stock in
          the Unsolicited Offer is increased, the Company may, not
          later than 24 hours prior to the latest time by which
          Common Stock must be tendered in order to be accepted in
          the Unsolicited Offer, rescind its Section 6.5 Acceptance
          Notice (in which event it will have no obligation to
          purchase such Section 6.5 Securities and such Section 6.5
          Securities may be sold into the Unsolicited Offer).
          Notwithstanding anything to the contrary contained in
          this Section 6.5, for so long as the agreement deemed to
          exist upon delivery of a Section 6.5 Acceptance Notice
          remains in effect, the Investor shall not and shall cause
          the Investor Group not to, tender any Voting Securities
          pursuant to the Unsolicited Offer.

                    (b) The purchase price for any Section 6.5
          Securities (the "Section 6.5 Price"), assuming
          simultaneous conversion of any Series A Convertible
          Preferred Stock, shall be the per share price of Common
          Stock paid in the Unsolicited Offer. The value of any
          securities offered in the Unsolicited Offer shall equal
          the average Market Price per share or per unit of such
          securities during the 30 consecutive trading days
          immediately preceding the Company's receipt of the
          Section 6.5 Transfer Notice. In the case of any
          securities not theretofore traded, the value of such
          securities shall be determined by two nationally
          recognized investment banking firms, one firm to be
          selected by each of the Investor and the Company, or in
          the event such firms are unable to agree, by a third
          nationally recognized investment banking firm selected by
          such firms. The Investor and the Company shall use their
          reasonable best efforts to cause any such determination
          of value to be made within five business days following
          the Company receipt of a Section 6.5 Transfer Notice. In
          connection with any determination of value pursuant to
          this Section 6.5(b), each party will bear the fees and
          expenses of the investment banking firm selected by it
          and the parties will bear equally the fees and expenses
          of any third investment banking firm.

                    (c) At any Section 6.5 Closing, the Company
          (and/or its designees) shall pay to the Investor (or its
          designees) the aggregate Section 6.5 Price for the
          Section 6.5 Securities by wire transfer of immediately
          available funds, and the Investor shall deliver or cause
          to be delivered to the Company (and/or its designees)
          such Section 6.5 Securities, with documentation
          satisfactory to the Company evidencing the transfer of
          such Section 6.5 Securities, in form acceptable for
          transfer on the Company's books. In the event a Section
          6.5 Closing occurs after the 30th day following delivery
          of the applicable Section 6.5 Acceptance Notice, then, in
          addition to the aggregate Section 6.5 Price, the Company
          (and/or its designees) shall pay to the Investor (or its
          designees) interest on the aggregate Section 6.5 Price
          for the period from and after such 30th day to and
          including the date of such Section 6.5 Closing. Such
          interest shall accrue at the Federal Funds Rate as in
          effect from time to time, plus 1/4 of 1%. Such interest
          shall not be compounded and shall be calculated on the
          basis of a 360-day year and the actual number of days
          elapsed.

                    (d) If the Company (and/or its designee) does
          not, to the extent specified in Section 6.5(a), exercise
          its right to purchase the securities specified in a
          Section 6.5 Transfer Notice, then the party giving such
          Section 6.5 Transfer Notice shall be free to effect the
          Disposition pursuant to the Unsolicited Offer of such
          Voting Securities, but only such Voting Securities, so
          specified in such Section 6.5 Transfer Notice (without
          being subject to the restrictions contained in Section
          6.3(e) hereof relating to the Company's purchase rights
          under this Section 6.5) and the Company shall take such
          steps as are necessary to effectuate the conversion into
          Common Stock of any Series A Convertible Preferred Stock
          to be tendered by the party giving the Section 6.5
          Transfer Notice prior to the acceptance of such shares
          for payment pursuant to the Unsolicited Offer so that
          such party shall have a reasonable opportunity to timely
          tender such shares in accordance with such Unsolicited
          Offer (including tenders of such shares by the Company on
          behalf of such party); provided that the Company and the
          Investor shall request that such shares be returned to
          the Company for exchange in accordance with Section
          6.7(c) if such shares are not accepted for purchase
          pursuant to the Unsolicited Offer and that, in the event
          of the return of such shares to the Investor, the
          Investor shall promptly return such shares to the Company
          for exchange in accordance with Section 6.7(c); provided,
          further, that the Company shall take such steps to ensure
          that any shares not tendered shall be duly issued and
          outstanding; provided, further, that (i) such Disposition
          is effected at a price equal to or in excess of the price
          offered in the Unsolicited Offer at the time that the
          Company's right to purchase such securities expires,
          taking into account any extension of the time by which
          the Company must exercise such right including by reason
          of clause (iii) below, (ii) except as provided in Section
          6.5(e) below, the foregoing shall not apply with respect
          to any shares as to which the Company shall have
          delivered a Section 6.5 Acceptance Notice in the event
          that the agreement deemed to exist with respect to such
          securities upon delivery of the applicable Section 6.5
          Acceptance Notice is terminated pursuant to Section
          6.5(e) hereof, and (iii) in the event that the price per
          share of Common Stock in the Unsolicited Offer is
          decreased at any time during such offer, any member of
          the Investor Group who wishes to effect a Disposition of
          Voting Securities pursuant to Section 6.3(e) shall give a
          Section 6.5 Transfer Notice to the Company of such
          intended Disposition (irrespective of whether a Section
          6.5 Transfer Notice was previously delivered with respect
          thereto) at least 48 hours prior to the latest time by
          which such securities must be tendered in order to be
          accepted in the Unsolicited Offer, and, notwithstanding
          any other provision of this Section 6.5, the Company
          shall have 24 hours following delivery of such Section
          6.5 Transfer Notice to deliver a Section 6.5 Acceptance
          Notice. If any such Disposition is not, subject to
          Section 6.3(e) hereof, completed prior to the later of
          (i) 60 days following the expiration of the Company's
          right to purchase the securities specified in a Section
          6.5 Transfer Notice, and (ii) 30 days following the
          redemption, amendment or modification of the Preferred
          Stock Purchase Rights or the Amended Rights Agreement (or
          a Substantially Similar Plan), any Voting Securities
          specified in such Section 6.5 Transfer Notice and not
          disposed of in such Disposition shall again be subject to
          the Company's purchase rights under this Section 6.5, to
          the extent provided in Section 6.3(e) hereof.

                    (e) The obligations of the parties to effect
          any Section 6.5 Closing shall be subject to the
          satisfaction of the following conditions: (i) all waiting
          periods, if any, applicable to the transactions occurring
          at such Section 6.5 Closing under the HSR Act, shall have
          expired or been terminated and (ii) no statute, rule,
          regulation, executive order, decree, ruling, injunction
          or other order shall have been enacted, entered,
          promulgated or enforced by any court or governmental
          authority of competent jurisdiction which prohibits such
          transactions or makes such transactions illegal. The
          obligation of the Company (and/or its designees) to
          effect any Section 6.5 Closing shall be further subject
          to the condition that shares of Common Stock validly
          tendered in accordance with the terms of the Unsolicited
          Offer subject to prorationing in accordance therewith
          shall have been paid for or shall simultaneously with
          such Section 6.5 Closing be paid for pursuant to the
          Unsolicited Offer. If, as of any date on which a Section
          6.5 Closing is scheduled to occur, the foregoing
          conditions relating thereto have not been satisfied, then
          such Section 6.5 Closing shall occur as promptly as
          practicable following such satisfaction, and, with
          respect to the conditions set forth in the first sentence
          of this Section 6.5(e), the parties shall use their
          reasonable best efforts to cause the satisfaction of such
          conditions. If (x) the conditions relating to any Section
          6.5 Closing are not satisfied within 120 days in the case
          of clause (i), and 180 days in the case of clause (ii),
          following delivery of the applicable Section 6.5
          Acceptance Notice (or in the case of an order or
          injunction arising out of any proceeding initiated by the
          Investor or any member of the Investor Group, such later
          date on which such order or injunction becomes final and
          nonappealable), or (y) the Unsolicited Offer is
          terminated without the condition set forth in the second
          sentence of this Section 6.5 (e) being satisfied, then
          the Investor or the Company in the case of the preceding
          clause (x), or the Company in the case of the preceding
          clause (y), may, prior to the acceptance for payment of
          shares pursuant to the Unsolicited Offer, terminate the
          agreement deemed to exist upon delivery of the applicable
          Section 6.5 Acceptance Notice by delivering written
          notice to the other; provided that no such termination
          shall excuse a party for a breach of its obligations
          thereunder and, in the case of a termination by the
          Company pursuant to clause (x), the party having given
          the applicable Section 6.5 Transfer Notice shall be free
          to sell the Section 6.5 Securities into the Unsolicited
          Offer.

                    Section 6.6.  Required Dispositions. (a) If, at
          any time during the Standstill Period, the Total
          Ownership Percentage of the Investor Group shall exceed
          the Ownership Cap plus 1%, whether as a result of any
          repurchase of Common Stock by the Company pursuant to a
          tender offer, open market purchases or otherwise (a
          "Company Repurchase") or for any other reason, then, if
          and to the extent requested by the Company by written
          notice to the Investor which may be made at any time, the
          Investor shall, within twelve months after such request
          (the "Sell Down Period"), dispose of, or cause the other
          members of the Investor Group to dispose of (a "Required
          Disposition"), such number of Common Securities owned by
          the Investor Group as shall be necessary to reduce the
          Total Ownership Percentage of the Investor Group to no
          more than the then applicable Ownership Cap immediately
          prior to such Company Repurchase or other event giving
          rise to such Required Disposition (the "Required
          Disposition Amount"), as applicable; provided that any
          such Required Disposition shall be subject to the
          provisions of Section 6.3 and provided, further, that the
          Investor agrees that such Common Securities in excess of
          the Ownership Cap shall be voted by the Investor Group at
          any meeting of shareholders (or action by written consent
          in lieu of any such meeting) pro rata in accordance with
          the vote of all shares held by Persons other than the
          members of the Investor Group and Other Investor
          Affiliates. Notwithstanding the foregoing, if any
          Required Disposition during the applicable Sell Down
          Period (A) would result in liability to the Investor or
          other members of the Investor Group under Section 16(b)
          of the Exchange Act or any similar successor statute, or
          (B) would be prohibited as a result of the restrictions
          set forth in Section 9 of the Registration Rights
          Agreement on transfer of Common Securities, then such
          Sell Down Period (x) shall, in the case of clause (A)
          above, begin on the first date on which such Required
          Disposition may be effected without liability under
          Section 16(b) of the Exchange Act and (y) with respect to
          clause (B) above, be extended by the number of days that
          the Investor Group is restricted from selling Common
          Securities under the Registration Rights Agreement.

                    (b) The Company agrees to indemnify the
          Investor Group against any Loss (as defined below)
          incurred by the Investor Group as a result of any
          Required Disposition; provided, that (i) such Required
          Disposition is effected on an arm's-length basis to a
          Person that is not affiliated with any member of the
          Investor Group or Other Investor Affiliate either in a
          bona fide open market "brokers' transaction" or in a
          privately negotiated transaction, (ii) the purchase price
          in connection with such Required Disposition is paid in
          cash and (iii) the Required Disposition is made during
          the Sell Down Period following the receipt by the
          Investor of the notice from the Company specified in the
          first sentence of Section 6.6(a). For purposes of this
          Section 6.6, Voting Securities disposed of in a Required
          Disposition shall be deemed to have been disposed of in
          the order in which such Voting Securities were purchased.
          "Loss" means the amount, if any, by which (A) the
          weighted average purchase price of the Voting Securities
          disposed of by the Investor Group in a Required
          Disposition during a Sell Down Period calculated on a per
          share of Common Stock basis (based on the number of
          shares of Common Stock such Voting Securities are
          convertible into at such time, if applicable) (which
          shall not include (x) sales pursuant to the last proviso
          of Section 6.1(A)(a) or (y) sales of Voting Securities in
          excess of the Required Disposition Amount) (excluding any
          out-of-pocket expenses incurred in connection with such
          purchase) exceeds (B)(1) the higher of (x) the Market
          Price of the Common Stock for the trading day immediately
          preceding the closing of such Required Disposition and
          (y) the price received by the Investor Group pursuant to
          such Required Disposition (net in each case of ordinary
          brokerage or placement commissions incurred by the
          Investor to effect such Required Disposition) multiplied
          by (2) the number of Voting Securities sold in connection
          with such Required Disposition (excluding any Voting
          Securities in excess of the Required Disposition Amount).
          In no event will Losses be deemed to include any taxes
          payable in connection with such Required Disposition.
          Such indemnification payment, if any, shall be made,
          without interest, within five business days after the
          sale occurs.

                    Section 6.7.  Top-Up Rights; Permitted
          Reacquisitions; Exchange of Share Certificates.

                    (a) After the end of the Company Buy Back
          Period the Investor at its option may, at any time,
          purchase Voting Securities in open market purchases or
          privately negotiated transactions provided that, after
          giving effect to such purchase, the Investor Group's
          Total Ownership Percentage does not exceed the Ownership
          Cap then applicable to the Investor Group; provided that
          a block purchase of Voting Securities in accordance with
          the foregoing effected as a single transaction which
          results in the Investor Group's Total Ownership
          Percentage exceeding the Ownership Cap then applicable to
          the Investor Group shall not be deemed to violate this
          Section 6.7(a), Section 6.1 or any other provision hereof
          solely as a result of the acquisition of such excess
          securities so long as the aggregate Voting Securities so
          held by the Investor Group at any time in excess of the
          Ownership Cap represent an Equity Percentage of less than
          .04% and have an aggregate Market Price at the time of
          purchase of less than $2,000,000; provided that the
          Investor will transfer, or cause to be transferred, such
          excess Voting Securities to an unaffiliated entity within
          twelve months of the acquisition thereof by the Investor
          Group and all such excess Voting Securities, pending
          their transfer, shall be voted by the Investor Group in
          accordance with the requirements of clause (w) through
          (z) of Section 6.2 and on any other matter in the same
          proportion as the votes cast by or on behalf of all
          holders of the Company's Voting Securities other than the
          Investor Group and Other Investor Affiliates.

                    (b) The Ownership Cap shall initially be 20%,
          subject to reduction as follows:

                    (i) If, on the last day of the twelve-month
               period commencing on the day immediately succeeding
               the last day of the Company Buy Back period (or in
               the event that the Company shall issue during such
               twelve-month period Common Securities having an
               aggregate Equity Percentage after such issuance of
               3% or more, the twenty-four-month period commencing
               on the day immediately succeeding the last day of 
               the Company Buy Back Period (the "Initial Top-Up
               Period")) the Investor Group's Total Ownership
               Percentage is less than 20%, the Ownership Cap shall
               be reduced to the amount of such Total Ownership
               Percentage.

                    (ii) At any time after the expiration of the
               Initial Top-Up Period, the Ownership Cap shall be
               reduced by the amount by which, during each
               successive twelve-month period following any
               Dilutive Issuance, the Common Stock purchased by the
               Investor represents an Equity Percentage of less
               than 3% (disregarding in computing such Equity
               Percentage any subsequent Dilutive Issuance);
               notwithstanding the foregoing, the Ownership Cap
               shall not be reduced at any time the Total Ownership
               Percentage is equal to the Ownership Cap.

                    (iii) The Ownership Cap shall be reduced by the
               Equity Percentage represented by all Transfers (as
               hereinafter defined) by the Investor Group of Common
               Securities to Persons other than members of the
               Investor Group other than (a) inadvertent
               dispositions or (b) dispositions in excess of the
               Required Disposition Amount in connection with block
               trades executed to facilitate a Required
               Disposition, provided that the aggregate amount
               excluded under (a) and (b) above does not exceed .5%
               of the Equity Percentage and is actually purchased
               by the Investor or a wholly-owned United States
               Subsidiary of the Investor within twelve months of
               the date of the disposition referred to in (a) or
               (b) above, as the case may be. For purposes of this
               Section 6.7(b)(iii), the term "Transfer" with
               respect to Voting Securities shall include any sale,
               exchange, offer to sell or exchange, contract to
               sell or exchange, option or warrant to purchase or
               exchange, any dividend of, or any swap or other
               agreement or transaction that transfers, directly or
               indirectly, the economic consequence of ownership of
               Voting Securities and such Transfer shall be deemed
               to occur on the date upon which the all conditions
               to the consummation of such Transfer are subject to
               the discretion of the transferee.

                    (iv) Any period of twelve or twenty-four months
               under this Section 6.7 shall be extended by the
               number of days that the Investor Group cannot
               purchase Common Stock without liability under
               Section 16(b) of the Exchange Act due to a Required
               Disposition.

                    (c) The Investor shall present for exchange,
          and the Company shall exchange at no cost to the
          Investor, any Common Securities acquired by the Investor
          Group, whether purchased pursuant to this Section 6.7 or
          received by way of dividend or otherwise (other than
          shares of Common Stock acquired pursuant to Section
          6.1(A)(a)(iii)) for shares of Series A Convertible
          Preferred Stock (at a ratio of one share of Series A
          Convertible Preferred Stock in exchange for each 100
          shares of Common Stock (as appropriately adjusted to
          reflect any stock split, stock dividend, reverse stock
          split, reclassification or any other transaction with a
          comparable effect)).

                    (d) No purchase pursuant to this Section 6.7
          may be made by the Investor Group during any period
          during which the Company notifies the Investor that this
          Company is effecting a "distribution" as defined in
          Regulation M under the Securities Act; provided, that any
          period of twelve months or twenty-four months under this
          Section 6.7 shall be extended by the number of days that
          the Investor Group is so prohibited from purchasing
          shares of Common Securities as a result of this Section
          6.7(d).

                    (e) A "Dilutive Issuance" shall mean any
          issuance of Common Securities by the Company after the
          Closing Date; provided, that no Dilutive Issuance shall
          be deemed to have occurred unless such issuance, together
          with all other issuances since the Closing Date or the
          most recent Dilutive Issuance to occur (other than those
          which have been theretofore taken into account for
          purposes of this Section 6.7(e)), shall represent an
          Equity Percentage of 1% or more; provided, however, that
          any adjustments which by reason of this Section 6.7(e)
          are not required to be made shall be carried forward and
          taken into account in, and as of the date of, any
          subsequent adjustment. All calculations shall be made to
          the nearest one thousandth of a percent.

                    Section 6.8.  Spin-off Distributions. In the
          event that the Company makes any Spin-off Distribution,
          then effective as of the date of such Spin-off
          Distribution, without any action on the part of the
          Company, the Spin-off Company or the Investor, there
          shall be deemed to exist, in addition to this Agreement,
          between the Investor and the Spin-off Company a binding
          agreement (the "Spin-off Agreement") containing
          provisions substantially identical to Section 6 hereof,
          including the definitions of any capitalized terms used
          in such Sections but defined in other Sections of this
          Agreement; provided that, for purposes of the Spin-off
          Agreement (i) references to the Company shall mean the
          Spin-off Company; (ii) references to Voting Securities
          shall mean the Voting Securities of the Spin-off Company,
          (iii) references to "the date hereof" and "the date of
          this Agreement" shall mean the date of the Spin-off
          Distribution; and (iv) the Spin-off Agreement shall
          terminate on the date this Agreement would have
          terminated or does terminate pursuant to Section 10.
          Prior to any Spin-off Distribution, the Investor shall,
          and the Company shall cause the Spin-off Company to,
          enter into an agreement memorializing the Spin-off
          Agreement.

                    Section 6.9.  Competing Investments. From and
          after the date hereof, and following the Closing for so
          long as the Ownership Cap is 18% or more and no Trigger
          Event or Release Event shall have occurred, the Company
          shall not consummate or agree pursuant to a binding
          agreement to consummate a Competing Investment at any
          time prior to the fourth anniversary of the date of this
          Agreement. So long as the Ownership Cap is 18% or more
          and no Trigger Event or Release Event shall have
          occurred, the Company shall not consummate or agree
          pursuant to a binding agreement to consummate a Competing
          Investment at any time after the fourth anniversary of
          the date of this Agreement, unless (a) the Company shall
          have provided the Investor prior written notice of such
          proposed Competing Investment at least 30 days prior to
          the earlier of the consummation of or the entering into a
          binding agreement providing for such Competing Investment
          specifying the principal terms thereof (including the
          form and amount of such Competing Investment and the
          identity of the Competitor proposing to make such
          Competing Investment) (such notice, the "Competing
          Investment Notice") and (b) the Competitor shall have
          agreed in the Competitor Agreement or otherwise that (x)
          neither it nor any of its Affiliates or Associates
          (including any of its designees on the Board) will have
          access to any DuPont Proprietary Information or Joint
          Intellectual Property (as such terms are defined in the
          Research Alliance Agreement) except pursuant to a
          sublicense from the Company with respect to Pioneer
          Products (as defined in the Research Alliance Agreement)
          that is permitted pursuant to the Research Alliance
          Agreement, (y) upon any breach of the agreement referred
          to in clause (x) above, and so long as the Investor shall
          have the right to designate any Investor Nominees for
          election or appointment to the Board pursuant to Section
          5 (and without limiting any other remedies the Investor
          may otherwise have), the Competitor will cause all
          designees of the Competitor on the Board to immediately
          resign and the Competitor will not have any rights to
          nominate any other persons to the Board, and (z) the
          provisions of the agreement referred to in this clause
          (b) shall be for the express benefit of the Investor and
          the Investor shall be a third party beneficiary thereof.
          The Investor shall have the right, which may be exercised
          by written notice to the Company delivered during the
          period commencing on the date of delivery of the
          Competing Investment Notice to the Investor and ending on
          the date which is the later of (i) the 30th day
          thereafter, (ii) the execution by the Company of a
          binding agreement providing for the Competing Investment
          (or, if no such agreement is executed, the consummation
          of such Competing Investment) and (iii) the second
          Business Day after the Company notifies the Investor in
          writing it will execute an agreement effectuating (or
          consummate, as the case may be) the transactions
          contemplated in the preceding clause (ii), provided that
          such notification shall not be deemed given unless such
          agreement is in fact executed (or transaction
          consummated, as the case may be) within such two Business
          Day period, notwithstanding the provisions of Section
          6.1(A), to discuss the merits of the Competing Investment
          with the Company and the Board or to make alternative
          public or private proposals with respect thereto. The
          Investor shall also have the right, exercisable by
          delivering a notice (the "Competitor Release Notice") to
          the Company within the time period specified below, of
          its election to immediately terminate the Formation
          Agreement (the election of the Investor to so terminate
          the Formation Agreement, a "Release Event"), which
          termination shall be carried out, (i) if the Competing
          Investment resulting in such Release Event occurs or is
          consummated, or if the agreement providing therefor is
          executed by the parties thereto, prior to the seventh
          anniversary of the date of this Agreement, in accordance
          with the provisions of Section 9.2(d)(X) of the Formation
          Agreement as if an Involuntary Default described therein
          had occurred (and as if the Investor was the
          non-defaulting "Party" for purposes of Section 9.2(d)(X)
          of the Formation Agreement) upon consummation of the
          Competing Investment, and (ii) in all other cases, in
          accordance with the provisions Section 9.2(d)(Y) of the
          Formation Agreement as if an Involuntary Default
          described therein had occurred (and as if the Investor
          was the non-defaulting "Party" for purposes of Section
          9.2(d)(Y) of the Formation Agreement). A Release Event
          shall be irrevocable and binding upon the Investor and
          the Company, except that (A) the Investor may, in the
          case of a termination carried out in accordance with
          clause (i) of the preceding sentence, rescind such
          Release Event (in which event all rights and obligations
          of the parties shall be as if no Release Event shall have
          ever occurred) for a period of five Business Days after
          the determination of Fair Market Value (as defined in,
          and calculated pursuant to, the Formation Agreement) by
          delivering a written notice of such rescission to the
          Company within such period, and (B) the Investor may
          rescind such Release Event (in which event all rights and
          obligations of the parties shall be as if no Release
          Event shall have ever occurred) for a period of five
          Business Days following the entry of a final and
          non-appealable Order as contemplated by the following
          sentence and (C) the Release Event shall automatically be
          rescinded (in which event all rights and obligations of
          the parties shall be as if no Release Event shall have
          occurred) if the Competing Investment which triggered
          such Release Event was not consummated, as advised in
          writing by the Company to the Investor. The closing of
          the transfer of the Investor's or the Company's Venture
          Interest, as applicable (as defined in the Formation
          Agreement) following a Release Event shall be as soon as
          practicable following the expiration or termination of
          all waiting periods, if any, under the HSR Act and in any
          event no later than the later to occur of (I) 15 days
          after the delivery of the Competitor Release Notice and
          (II) 5 business days after the expiration or termination
          of all waiting periods, if any, under the HSR Act,
          subject to no Order having been entered, promulgated or
          enforced by a court or governmental authority of
          competent jurisdiction which prohibits such transaction
          (and the Investor and the Company shall use commercially
          reasonable efforts to have any such Order lifted or
          terminated in order to allow consummation of such
          transaction unless and until such time as such Order
          becomes final and non-appealable). The Competitor Release
          Notice, in order to result in the rights described above,
          must be delivered by the Investor to the Company within
          twenty Business Days after the earlier of (i) the public
          announcement by the Company of the consummation of the
          Competing Investment, and (ii) the Company notifying the
          Investor in writing that the Competing Investment has
          been consummated (and the Company agrees to promptly so
          notify the Investor); provided, however, that the
          Investor may deliver a Competitor Release Notice at any
          time after it becomes aware of the consummation of a
          Competing Investment until twenty Business Days after
          either of the events described in clauses (i) or (ii)
          above shall have occurred. Notwithstanding anything to
          the contrary in this Agreement, following consummation of
          the Competing Investment, the Investor, with the consent
          of the Company, may engage in discussions with the
          Company as to matters relating to the Joint Venture
          Agreement (including the entity established pursuant to
          the Formation Agreement) and the Research Alliance
          Agreement, including the terms of a purchase or sale of
          any interest therein. Notwithstanding anything herein to
          the contrary, solely for purposes of Section 5.2(z),
          6.2(e) and clause (iii) and the reference to Sections
          8.1(b) and (c) contained in the second to last sentence
          of Section 6.9, the Release Event will not be deemed to
          have occurred (and the rights and obligations of the
          parties referenced therein will not come into effect)
          until the earlier of (I) the time, following a Release
          Event, of the consummation of the transfer of the
          Company's or the Investor's Venture Interest, as
          applicable (each as defined in the Formation Agreement)
          in connection with such Release Event and (II) six months
          following such Release Event. Upon the occurrence of a
          Release Event, (i) the Standstill Period shall be
          extended, in respect of the sections indicated, and to
          the extent provided, in Section 10.2(iv), (ii) the
          Company shall file and use commercially reasonable
          efforts to obtain and maintain the effectiveness of a
          shelf registration statement on the terms set forth in
          the Registration Rights Agreement, (iii) the Investor
          shall immediately cause all of the Investor Nominees then
          serving on the Board to offer their resignations from the
          Board, and the Company's obligations to designate
          Investor Nominees to the Board pursuant to Section 5
          shall terminate, (iv) the parties' obligations and rights
          pursuant to Section 6.7(a), Section 8.1(b) and (c),
          Section 8.2, Section 8.3 and Section 8.8 shall terminate,
          (v) the provisions of Section 6.3(g) shall thereafter
          apply and (vi) the provisions of Section 6.1(A), Section
          6.2(e), Section 6.6, Section 6.7(b) through (e) and
          Section 6.8 shall remain in full force and effect in
          perpetuity. The rights of the Investor to terminate the
          Formation Agreement pursuant to Section 6.9 and Section
          8.2(c) hereof shall automatically be transferred and
          assigned at the election of the Investor, upon notice to
          and acknowledgment by the Company of such notice, but
          without any consent required on the part of the Company,
          to any Spin-Off Entity (which term, for purposes of this
          sentence, shall include any Person who would otherwise be
          deemed a Spin-Off Entity but for such Person's status as
          a Subsidiary of the Investor) which is a Subsidiary of
          the Investor or satisfies each of the conditions set
          forth in clauses (i) through (v) of the definition of the
          term "Sale of Ag Products."

                    Section 6.10.  Rights of the Company upon a
          Trigger Event.

                    In the event that:

                         (A) the Research Alliance Agreement or the
          Formation Agreement shall be terminated (notwithstanding
          the survival of certain obligations of the parties for
          the periods following such termination as provided in
          Section 9.4 of the Formation Agreement) other than (i) a
          termination of the Research Alliance Agreement or the
          Formation Agreement as a result of a willful and
          substantial breach by the Company of any material term of
          the Formation Agreement or the Research Alliance
          Agreement, (ii) a termination of the Research Alliance
          Agreement at or after the sixteenth anniversary of the
          date of such agreement, and (iii) a termination of the
          Formation Agreement or the Research Alliance Agreement in
          connection with the acquisition by one party of the
          Venture Interest of the other pursuant to a Change in
          Control Release Event or a Release Event and where the
          consequences set forth in Section 8.2(b) or in the second
          to last sentence of Section 6.9, as and to the extent
          applicable, shall apply; or

                         (B) there shall have occurred a Sale of Ag
          Products;  (any of such events, a "Trigger Event"), then,
          effective immediately upon the occurrence of such Trigger
          Event (i) the Standstill Period shall be extended, in
          respect of the sections indicated, and to the extent
          provided, in Section 10.2(iv), (ii) the Company shall
          file and use its commercially reasonable efforts to
          obtain and maintain the effectiveness of a shelf
          registration statement on the terms set forth in the
          Registration Rights Agreement, (iii) the Investor shall
          immediately cause all Investor Nominees then serving on
          the Board to offer their resignations from the Board, and
          the Company's obligations to designate Investor Nominee
          to the Board pursuant to Section 5 shall terminate, (iv)
          the parties' obligations and rights pursuant to the
          provisions of Section 6.6(b) (but only with respect to
          Section 6.6(b) in the case of a Trigger Event pursuant to
          clause (B) above or in the case of a Trigger Event
          pursuant to clause (A) above occurring as a result of a
          willful and substantial breach by the Investor of any
          material term of the Joint Venture Agreement or the
          Research Alliance Agreement), Section 6.7(a), Section
          6.9, clauses (b) and (c) of Section 8.1, Section 8.2,
          Section 8.3, and Section 8.8 shall terminate, (v) the
          provisions of Section 6.3(g) shall thereafter apply, and
          (vi) Section 6.1(A), Section 6.2(e), Section 6.6(a),
          Section 6.6(b) (but only with respect to Section 6.6(b)
          in the case of a Trigger Event pursuant to clause (A)
          above other than a Trigger Event occurring as a result of
          a willful and substantial breach by the Investor of any
          material term of the Joint Venture Agreement or the
          Research Alliance Agreement), Section 6.7(b)-(e) and
          Section 6.8 shall remain in full force and effect in
          perpetuity. The Investor agrees that it will not permit a
          transaction constituting a Sale of Ag Products
          (including, without limitation, a transaction that would
          otherwise be excluded from the definition of a Sale of Ag
          Products by reason of the satisfaction of the conditions
          set forth in clauses (i) through (v) of the proviso
          thereof) to be consummated or a binding agreement with
          respect thereto to be entered into prior to the first
          anniversary of the Closing Date.

                                  SECTION 7

                            PRE-CLOSING COVENANTS

                    Section 7.1. Taking of Necessary Action. Each
          of the parties hereto agrees to use its reasonable best
          efforts promptly to take or cause to be taken all action
          and promptly to do or cause to be done all things
          necessary, proper or advisable under applicable laws and
          regulations to consummate and make effective the Closing
          of the transactions contemplated by this Agreement.
          Without limiting the foregoing, the Investor and the
          Company (a) will use their reasonable best efforts to
          make all filings, including filings under the HSR Act,
          and obtain all other Regulatory Approvals necessary or,
          in the opinion of the Investor or the Company, advisable
          in order to permit the consummation of the transactions
          contemplated hereby and (b) will not take actions
          (including by making other acquisitions of or investments
          in any other Person) that could reasonably be expected to
          have the effect of delaying or hindering the Closing of
          the transactions contemplated hereby. Each party shall
          execute and deliver both before and after the Closing
          such further certificates, agreements and other documents
          and take such other actions as the other party may
          reasonably request to consummate or implement the
          transactions contemplated hereby or to evidence such
          events or matters.

                    Section 7.2.  Notifications. (a)  At all times
          prior to the Closing Date, the Investor shall promptly
          notify the Company and the Company shall promptly notify
          the Investor in writing of any fact, change, condition,
          circumstance or occurrence or nonoccurrence of any event
          which will or is reasonably likely to (i) constitute a
          breach of any representation or warranty of such party
          contained in the Transaction Agreements; or (ii) result
          in the failure to satisfy the conditions to be complied
          with or satisfied by it hereunder; provided, that the
          delivery of any notice pursuant to this Section 7.2 shall
          not limit or otherwise affect the remedies available
          hereunder to any party receiving such notice.

                    (b) To the extent that the Investor or the
          Company is required to make any filings with the
          Commission in connection with the transactions
          contemplated by this Agreement, such party shall give the
          other party a reasonable opportunity to review and
          comment on such filings prior to the filing thereof with
          the Commission.

                    Section 7.3.  No-Shop. From the date hereof
          until the Closing or the earlier termination of this
          Agreement, except with respect to an unsolicited Proposal
          to the extent required by the fiduciary obligations of
          the Board of Directors of the Company, as determined in
          good faith by the Board of Directors based on the advice
          of outside counsel, the Company shall not and shall not
          permit or authorize any of its Subsidiaries, Affiliates
          or Representatives to, directly or indirectly, (i)
          solicit or initiate, or encourage the submission of, any
          Proposal with respect to the Company, or (ii) participate
          in any discussions or negotiations regarding, or furnish
          to any Person any information with respect to, or take
          any other action to facilitate any inquiries or the
          making of any proposal that constitutes, or may
          reasonably be expected to lead to, any Proposal, other
          than the transaction contemplated hereby with the
          Investor.

                    Section 7.4.  Share Listing. As soon as
          practicable but in any event prior to the date that the
          Closing would otherwise have occurred, the Company shall
          take reasonable action as is required to cause the shares
          of Common Stock into which the shares of Series A
          Convertible Preferred Stock are convertible to be listed
          for trading on the NYSE.

                    Section 7.5.  Registration Rights Agreement. At
          the Closing, the Company and the Investor shall enter
          into the Registration Rights Agreement.

                    Section 7.6.  Pre-Closing Information. The
          Company shall (and shall cause each of its Subsidiaries
          to), from and after the date hereof and until the Closing
          and subject to Section 8.1(a), afford to the Investor and
          its Representatives reasonable access, upon reasonable
          notice and in such manner as will not unreasonably
          interfere with the conduct of the Company's business, to
          material financial information regarding the Company. The
          Company will reasonably promptly inform the Investor of
          the principal terms of any Proposal with respect to which
          the Company has entered into substantive discussions or
          negotiations.


                                  SECTION 8

                             ADDITIONAL COVENANTS

                    Section 8.1.  Certain Information. (a) Subject
          to applicable law and the provisions of this Agreement,
          all information provided to the Investor or the Company
          hereunder shall be provided in confidence in accordance
          with the provisions of the Confidentiality Agreement (the
          "Confidentiality Agreement"), dated March 13, 1997,
          between the Company and the Investor.

                    (b) At such time as the Investor shall notify
          the Company that it shall account for its investment in
          the Company pursuant to the full equity method (including
          earnings and investments), the Company will, at
          Investor's sole cost and expense, cooperate to the extent
          necessary to furnish to the Investor all information that
          is required by GAAP to enable the Investor to account for
          its investment in such manner and the Company hereby
          consents to the Investor doing so. To the extent
          reasonably requested by the Investor, the Company will
          and will cause its Representatives to, at the Investor's
          sole cost and expense, provide information regarding the
          Company and its Subsidiaries, and otherwise cooperate
          with, the Investor so as to enable the Investor to
          prepare financial statements in accordance with GAAP and
          to comply with its disclosure requirements under
          securities laws and regulations.

                    (c) From time to time upon reasonable advance
          request by the Company, the Investor will notify the
          Company of the amount of each class of Voting Securities
          then Beneficially Owned by the Investor Group. From time
          to time upon reasonable advance request by the Investor,
          the Company will provide the Investor with information
          known to the Company with respect to the number of votes
          entitled to be voted by shareholders of the Company at
          the time of such request; provided, however, that the
          Company shall not be obligated pursuant to this Section
          8.1(c) to make any general solicitation of shareholders
          of the Company in connection therewith.

                    Section 8.2.  Right to Participate in Sale of
          the Company. (a) Prior to the Closing and thereafter, so
          long as the Ownership Cap is 18% or more, (I) the Company
          shall not enter into, and the Board shall not publicly
          recommend to shareholders or approve, a definitive
          agreement providing for a Change in Control Transaction
          and (II) the Board shall not redeem the Preferred Stock
          Purchase Rights or otherwise amend or modify the Amended
          Rights Agreement (or a Substantially Similar Plan) to be
          inapplicable (including by taking action to cause a
          Section 11(a)(ii) Event or Section 13 Event (each as
          defined in the Amended Rights Agreement as in effect on
          the date hereof), not to occur that, absent such action,
          would otherwise have occurred, or to redeem the Preferred
          Stock Purchase Rights) to a proposed Change in Control
          Transaction for which no definitive agreement is entered
          into as a means, in any such case, intended to permit a
          proposed Change in Control Transaction to be consummated
          without causing a Triggering Event (as defined in the
          Amended Rights Agreement) to occur or otherwise exempt
          such transaction therefrom, unless prior thereto (i) the
          Investor shall have been given at least 30 days prior
          notice of the proposed Change in Control Transaction and
          of the material terms thereof and a full and fair
          opportunity, as conclusively determined by the Board in
          good faith and in the exercise of its fiduciary duties,
          after consultation with outside counsel, to participate
          in the Company's bidding process (the "Process")
          undertaken by the Company (if any) in advance of such
          Change in Control Transaction on terms, and to have any
          proposal submitted by the Investor pursuant to clause
          (ii) below evaluated on a basis, no less favorable to the
          Investor than those afforded to other interested parties,
          (ii) the Investor shall have been permitted
          notwithstanding the restrictions contained in Section
          6.1, to submit a proposal for an alternative transaction
          during the Interim Period (as defined below) or in
          connection with such Process, subject in any event to the
          Board's right to accept or reject any such proposal as
          may be made and (iii) the Interim Period shall have
          terminated. "Interim Period" shall mean the period
          commencing on the date of the delivery to the Investor by
          the Company of written notice (such notice, the "Change
          in Control Transaction Notice") of its considering to
          take any action specified in clause (I) or clause (II) of
          the preceding sentence and ending on the date which is
          the later of (i) the 30th day thereafter, and (ii) the
          public announcement by the Company of the taking of any
          action specified in clause (I) or clause (II) of the
          preceding sentence. In connection with the foregoing, the
          Investor agrees that if the Company establishes
          procedures uniformly applicable to all interested parties
          for the evaluation of proposals for a Change in Control
          Transaction and if the Investor wishes to participate in
          the sale process, then, the Investor will, subject to the
          Investor not violating applicable law (other than
          violations based on claims or allegations of breach of
          the Company's fiduciary duty), comply with such
          procedures as long as such procedures (i) are applied
          uniformly to all interested parties (and the Company
          agrees that it shall give the Investor at least one
          Business Day's prior written notice if any such
          procedures are not to be uniformly applied to all such
          interested parties), (ii) except as conclusively
          determined by the Board in good faith and in the exercise
          of its fiduciary duties, after consultation with outside
          counsel, do not have a materially greater impact when
          applied to the Investor than when applied to other
          participants, and (iii) except as provided in Section
          8.2(c) below and the Formation Agreement, shall not
          establish procedures relating to the Joint Venture
          Agreement, or the entity established thereby, or the
          Research Alliance Agreement, or the rights and
          obligations of the Investor relating thereto. If the
          Company rejects any offer made by the Investor pursuant
          to the Process, the Company will advise the Investor in
          writing of the reasons for such rejection.

                    (b) Following the consummation of a Change in
          Control Transaction, unless either (x) any Person or 13D
          Group shall Beneficially Own Common Securities
          representing an Equity Percentage of more than 50% of the
          Company or of the common securities of the company or
          other entity surviving such Change in Control Transaction
          or (y) the Investor Group shall Beneficially Own Voting
          Securities representing less than 5% of the Total Voting
          Power of the Company or the voting power of the company
          or other entity surviving such Change in Control
          Transaction (a Change in Control Transaction where
          neither clause (x) nor (y) is satisfied, a "Surviving
          Change in Control Transaction"), then (unless, in the
          case of clause (i) below, the Company or other entity
          surviving such Change in Control Transaction shall
          otherwise determine as to all of such provisions) (i) the
          provisions of Section 6.1(A), Section 6.6, Section 6.7
          (other than clause (c) thereof to the extent that the
          Common Stock of the Company or the voting securities of
          the company or other entity surviving such Change in
          Control Transaction (1) is not entitled to more than one
          vote per share or (2) is entitled to more than one vote
          per share, but all shares of such class are so entitled),
          Section 6.8, Section 6.10, Sections 8.1(b) and (c) and
          Sections 8.2(a) and (b), shall continue in full force and
          effect through the balance of the Standstill Period
          (except that the Ownership Cap shall be appropriately
          adjusted to equal the ownership that the Investor Group
          would have owned after the Surviving Change in Control
          Transaction if the Investor Group had owned Common
          Securities equal to the Ownership Cap immediately prior
          to the Surviving Change in Control Transaction), (ii) the
          provisions of Section 5 and Section 6.2 shall terminate
          and (iii) the provisions of Section 6.3(g) shall
          thereafter apply provided, however, notwithstanding
          anything to the contrary contained in this Agreement
          (other than the following sentence), that at and
          following such time as (a) any Person or 13D Group shall
          Beneficially Own Common Securities representing an Equity
          Percentage of more than 50% of the Company or the company
          or other entity surviving such Change in Control
          Transaction or (b) the Investor Group shall Beneficially
          Own Voting Securities representing less than 5% of the
          Total Voting Power of the Company or of the voting power
          of the company or other entity surviving such Change in
          Control Transaction, then, in either case, none of the
          provisions or obligations set forth in this Agreement
          shall be applicable to the members of the Investor Group
          or to any Other Investor Affiliate. Following a Surviving
          Change in Control Transaction, the Company (or the
          surviving company or entity) shall file and use its
          commercially reasonable efforts to obtain and maintain
          the effectiveness of a shelf registration statement on
          the terms set forth in the Registration Rights Agreement.
          Notwithstanding anything to the contrary contained in the
          Agreement, following any Change in Control Transaction,
          the provisions of Section 8.2(c) shall apply to such
          Change in Control Transaction and, unless the Company or
          other entity surviving such Change in Control Transaction
          shall otherwise determine by written notice to the
          Investor at least 10 days prior to the date by which the
          Investor must exercise its rights to declare a Change in
          Control Release Event to occur as a result of such Change
          in Control Transaction, the provisions of Section 8.2(c)
          and Section 6.9 shall apply to any Change in Control
          Transaction or Competing Investment, as the case may be,
          arising thereafter with respect to the Company or other
          entity surviving such Change in Control Transaction.

                    (c) Without limiting the rights of the Investor
          set forth in Section 8.2(a) hereof, the Investor shall
          have the right, exercisable by delivering a notice (the
          "Change in Control Release Notice") to the Company within
          the time period specified below, of its election to
          immediately terminate the Formation Agreement (the
          election of the Investor to so terminate the Formation
          Agreement, a "Change in Control Release Event"), which
          termination shall be carried out, (i) if the Change in
          Control Transaction resulting in such Change in Control
          Release Event occurs or is consummated, or if the Company
          enters into, or the Board publicly recommends to
          shareholders or approves, a binding agreement providing
          for a Change in Control Transaction prior to the sixth
          anniversary of the date of this Agreement (or, in the
          case of a Change of Control Transaction involving a
          Person who is not a Competitor, the fifth anniversary of
          the date of this Agreement), in accordance with the
          provisions of Section 9.2(d)(X) of the Formation
          Agreement as if an Involuntary Default described therein
          had occurred (and as if the Investor was the
          non-defaulting "Party" for purposes of Section 9.2(d)(X)
          of the Formation Agreement) upon consummation of the
          Change in Control Transaction, and (ii) in all other
          cases, in accordance with the provisions of Section
          9.2(d)(Y) of the Formation Agreement as if an Involuntary
          Default described therein had occurred (and as if the
          Investor was the non-defaulting "Party" for purposes of
          Section 9.2(d)(Y) of the Formation Agreement). A Change
          in Control Release Event shall be irrevocable and binding
          upon the Investor and the Company, except that (A) the
          Investor may, in the case of a termination carried out in
          accordance with clause (i) of the preceding sentence,
          rescind such Change in Control Release Event (in which
          event all rights and obligations of the parties shall be
          as if no Change in Control Release Event shall have ever
          occurred) for a period of five Business Days after the
          determination of Fair Market Value (as defined in, and
          calculated pursuant to, the Formation Agreement) by
          delivering a written notice of such rescission to the
          Company within such period, and (B) the Investor may
          rescind such Change in Control Release Event (in which
          event all rights and obligations of the parties shall be
          as if no Change in Control Release Event shall have ever
          occurred) for a period of five Business Days following
          the entry of a final and non-appealable Order as
          contemplated by the following sentence, and (C) the
          Change in Control Release Event shall be automatically
          rescinded (in which event all rights and obligations of
          the parties shall be as if no Change in Control Release
          Event shall have occurred) if the Change in Control
          Transaction which triggered such Change in Control
          Release Event was not consummated, as advised in writing
          by the Company to the Investor. The closing of the
          transfer of the Investor's or the Company's Venture
          Interest, as applicable (as defined in the Formation
          Agreement) following a Change in Control Release Event
          shall be as soon as practicable following the expiration
          or termination of all waiting periods, if any, under the
          HSR Act and in any event no later than the later to occur
          of (I) 15 days after delivery of the Change in Control
          Release Notice and (II) 5 business days after the
          expiration or termination of all waiting periods, if any,
          under the HSR Act, subject to no Order having been
          entered, promulgated or enforce by a court or
          governmental authority of competent jurisdiction which
          prohibits such transaction (and the Investor and the
          Company shall use their commercially reasonable efforts
          to have any such Order lifted or terminated in order to
          allow consummation of such transaction unless and until
          such time as such Order becomes final and
          non-appealable). The Change in Control Release Notice, in
          order to result in the rights described above, must be
          delivered by the Investor to the Company within twenty
          Business Days after the earlier of (i) the public
          announcement by the Company of the consummation of the
          Change in Control Transaction, and (ii) the Company
          notifying the Investor in writing that the Change in
          Control Transaction has been consummated (and the Company
          agrees to promptly so notify the Investor); provided,
          however, that the Investor may deliver a Change in
          Control Release Notice at any time after it becomes aware
          of the consummation of a Change in Control Transaction
          until twenty Business Days after either of the events
          described in clauses (i) or (ii) above shall have
          occurred. Notwithstanding anything to the contrary in
          this Agreement, following consummation of Change in
          Control Transaction, the Investor may engage in
          discussions with the Company (and/or the Person
          consummating such Change in Control Transaction) as to
          matters relating to the Joint Venture Agreement
          (including the entity established pursuant to the
          Formation Agreement) and the Research Alliance Agreement,
          including the terms of a purchase or sale of any interest
          therein..

                    Section 8.3.  Use of Proceeds. (a) Subject to
          the provisions of this Agreement, as promptly as
          practicable, but in no event later than five business
          days after the Closing, the Company shall commence a
          self-tender offer (the "Offer") to purchase 16,444,586
          shares of Common Stock (the "Requisite Number") at a
          price per share not in excess of $104 per share (the
          "Maximum Offer Price"), nor less than a per share price
          to be determined in the sole discretion of the Company
          after consultation with the Investor (the price range
          from such maximum to minimum price, the "Per Share Price
          Range") net to the seller in cash. Pursuant to the Offer,
          the Company will determine the single per share price,
          within the Per Share Price Range, net to the seller in
          cash (the "Offer Purchase Price") that it will pay for
          shares properly tendered pursuant to the Offer, taking
          into account the number of shares so tendered and the
          prices specified by the tendering stockholders. The
          Company will select the lowest Offer Purchase Price that
          will allow it to buy the Requisite Number of shares of
          Common Stock (or such lesser number of shares as are
          properly tendered and not withdrawn at prices within the
          Per Share Price Range). All shares of Common Stock
          properly tendered at prices at or below the Offer
          Purchase Price and not withdrawn will be purchased at the
          Offer Purchase Price, subject to the terms and conditions
          of the Offer. All shares of Common Stock acquired in the
          Offer will be acquired at the Offer Purchase Price.
          Subject to the terms and conditions thereof, the Offer
          shall expire at midnight New York City time on the date
          that is 20 business days from the date the Offer is first
          published or sent to holders of Common Stock; provided,
          however, that the Company may (A) extend the Offer, if at
          the scheduled expiration date of the Offer any of the
          conditions to the Company's obligation to accept for
          payment, and pay for, shares of Common Stock shall not
          have been satisfied or waived, until such time as such
          conditions are satisfied or waived, (B) extend the Offer
          for any period required by any rule, regulation,
          interpretation or position of the Commission or the staff
          thereof applicable to the Offer and (C) extend the Offer
          for any reason on one or more occasions for an aggregate
          period of not more than 5 business days beyond the latest
          expiration date that would otherwise be permitted under
          clause (A) or (B) of this sentence. No member of the
          Investor Group shall, and the Investor shall use
          commercially reasonable efforts to cause all Other
          Investor Affiliates not to, tender any shares of Common
          Stock owned by them into the Offer. 

                    (b) If the Company, pursuant to the Offer,
          shall have purchased fewer than the Requisite Number of
          shares of Common Stock, the Company shall use
          commercially reasonable efforts during the remainder of
          the Company Buy Back Period to repurchase shares of
          Common Stock from the shareholders of the Company other
          than the Investor, any member of the Investor Group or
          any Other Investor Affiliates in open market purchases or
          pursuant to additional self-tender offers by the Company
          to the extent necessary so that the Total Ownership
          Percentage of the Investor Group shall be equal to
          Ownership Cap; provided, however, that in no event shall
          (i) unless the provisions of clause (c) of this Section
          8.3 are applicable, the Company be required to pay
          greater than $104 per share of Common Stock in any such
          repurchase, (ii) the aggregate amount paid by the Company
          (deducting therefrom all amounts paid by the Investor to
          the Company pursuant to paragraph (c) below) for shares
          of Common Stock pursuant to the Offer and pursuant to
          additional repurchases under this Section 8.3(b) exceed
          the total Purchase Price, and (iii) the number of shares
          of Common Stock acquired by the Company pursuant to the
          Offer and this Section 8.3(b) exceed the Requisite
          Number.

                    (c) Following completion of the Offer, the
          Investor shall have the right to designate in writing
          from time to time a maximum price or prices at which the
          Company shall seek to purchase shares of Common Stock
          that is in excess of $104 per share provided that at the
          end of the Company Buy-Back Period, the Investor shall
          pay in cash in immediately available funds to the Company
          an amount equal to the excess, if any, of (x) the
          weighted average cost to the Company for the purchase of
          all shares of Price Protected Common Stock (as defined
          below) purchased by the Company during the Company
          Buy-Back Period over (y) the Purchase Price, together
          with interest thereon at the Company's borrowing rate
          under its bank lines of credit, for each day the Company
          has incurred all or any portion of such excess. "Price
          Protected Common Stock" shall mean all shares of Common
          Stock purchased by the Company pursuant to the Offer and
          the first shares of Common Stock purchased by the Company
          after the consummation of the Offer at or below the
          maximum price or prices specified by the Investor
          pursuant to this paragraph (c) which, taken together with
          the number of shares of Common Stock purchased pursuant
          to the Offer, are equal to the Requisite Number.

                    (d) References herein to Requisite Number and
          price per share of Common Stock shall be appropriately
          adjusted in the event of any stock split, stock
          combination or similar adjustment in the number of shares
          of Common Stock outstanding.

                    Section 8.4. Rights Agreement. From and after
          the date hereof the Company shall not amend, modify,
          waive, terminate or invalidate any provision of the
          Amended Rights Agreement or any similar shareholder
          rights plan or similar device (a "Substantially Similar
          Plan"), in a manner which would cause the Investor Group
          to become an "acquiring person" under the Amended Rights
          Agreement or any Substantially Similar Plan upon the
          exercise of any rights granted to the Investor hereunder.

                    Section 8.5. Publicity. Except as required by
          Law or by obligations pursuant to any listing agreement
          with any relevant securities exchange, neither the
          Company or any of its Affiliates nor the Investor or any
          of its Affiliates shall, without the prior written
          consent of the other, which consent shall not be
          unreasonably withheld or delayed, make any public
          announcement or issue any press release with respect to
          the transactions contemplated by this Agreement. Prior to
          making any public disclosure required by applicable Law
          or pursuant to any listing agreement with any relevant
          national exchange, the disclosing party shall consult
          with the other party, to the extent feasible, as to the
          content of such public announcement or press release.
          Notwithstanding the foregoing, the Investor and the
          Company may, in meetings with securities and other
          financial analysts and press interviews, disclose
          information (other than non-public information)
          concerning the transactions contemplated hereby and the
          Investor's investment in the Company and in a manner not
          inconsistent with prior joint public announcements
          regarding the transactions and in a manner consistent
          with the other terms of this Agreement.

                    Section 8.6.  Legend. The Investor agrees to
          the placement on certificates representing shares of
          Series A Convertible Preferred Stock purchased by the
          Investor pursuant hereto, of a legend substantially as
          set forth below (except that the first sentence of such
          legend shall not be placed on any shares of Common Stock
          issuable upon conversion of Series A Convertible
          Preferred Stock that have been registered under the
          Securities Act or if, in the opinion of counsel, such
          sentence is not required under the Securities Act),
          unless the Company determines otherwise, in accordance
          with the opinion of counsel:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT
          BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933
          (THE "SECURITIES ACT"), OR THE SECURITIES LAWS OF ANY
          STATE OF THE UNITED STATES OR NON-U.S. JURISDICTION AND
          MAY NOT BE OFFERED, SOLD, TRANSFERRED OR OTHERWISE
          DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION
          STATEMENT OR PURSUANT TO AN EXEMPTION FROM, OR IN A
          TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS
          OF THE SECURITIES ACT AND ANY APPLICABLE SECURITIES LAWS
          OF SUCH OTHER JURISDICTIONS. THE SECURITIES REPRESENTED
          BY THIS CERTIFICATE ARE SUBJECT TO THE PROVISIONS
          (INCLUDING PROVISIONS THAT RESTRICT THE TRANSFER OF SUCH
          SECURITIES) OF AN INVESTMENT AGREEMENT DATED AS OF AUGUST
          6, 1997 BETWEEN THE E.I. DU PONT DE NEMOURS AND COMPANY
          AND PIONEER HI-BRED INTERNATIONAL, INC. (THE "COMPANY"),
          COPIES OF WHICH ARE ON FILE AT THE OFFICES OF THE
          SECRETARY OF THE COMPANY."

                    Section 8.7.  No Restrictions. For so long as
          the Total Ownership Percentage of the Investor Group
          shall equal 10% or more, in the aggregate, the Company
          will not take or recommend to its shareholders any
          amendment to the Company's Articles of Incorporation or
          Bylaws which would impose limitations on the legal rights
          of the Investor Group as Company shareholders (other than
          those imposed pursuant to this Agreement) based upon the
          size of security holding permitted under this Agreement,
          the business in which a security holder is engaged or
          other considerations applicable to the Investor Group and
          not to security holders generally.

                    Section 8.8.  Amendment to Articles of
          Incorporation. So long as the Ownership Cap is 18% or
          more, the Company will propose, and the Board shall
          recommend for adoption by the shareholders of the
          Company, no later than the first annual meeting of
          shareholders following the end of the Company Buy Back
          Period (or such earlier time as the Total Ownership
          Percentage of the Investor Group shall equal the
          Ownership Cap), and no less frequently than each annual
          meeting thereafter until the Reclassification Amendment
          (as hereinafter defined) is adopted, an amendment (the
          "Reclassification Amendment") to the Articles of
          Incorporation of the Company providing for, and only for,
          (a) the authorization of a new class of common stock (in
          addition to the Common Stock) to be designated as the
          Class B Common Stock and consisting of the same number of
          authorized shares as the number of authorized shares of
          Series A Convertible Preferred Stock and which Class B
          Common Stock shall, as to each share, have the identical
          rights, powers and preferences (including as to
          dividends, voting rights, liquidation preference,
          restriction on transfer, adjustment and conversion) as
          pertains to each share of Series A Convertible Preferred
          Stock and (b) upon the adoption and effectiveness of the
          Reclassification Amendment, the automatic
          reclassification of each outstanding share of Series A
          Convertible Preferred Stock into one validly issued and
          fully paid share of Class B Common Stock (whereupon, all
          references to the Series A Convertible Preferred Stock in
          this Agreement shall thereafter mean and refer to the
          corresponding number of shares of Class B Common Stock).
          In connection with each meeting of the Company's
          shareholders at which the Reclassification Amendment is
          submitted for approval of the Company's shareholders, the
          Company shall use its commercially reasonable efforts to
          cause the adoption of the Reclassification Amendment by
          the shareholders of the Company, including soliciting
          proxies in favor of the adoption of the Reclassification
          Amendment by the shareholders of the Company. If, after
          the date of the fifth annual meeting of the Company's
          shareholders following the end of the Company Buy-Back
          Period, (x) the Reclassification Amendment shall not have
          been approved by the shareholders of the Company, and (y)
          the Investor shall have been advised in writing by its
          regular independent public accounting firm that unless
          the shares of Series A Convertible Preferred Stock owned
          by the Investor Group are converted into Common Stock in
          accordance with this Section 8.8, such firm cannot
          deliver its opinion that the Investor is entitled to
          account for its investment in the Company on the full
          equity accounting method (including earnings and
          investments) (other than, in any such case referred to in
          this clause (y), as a result of the failure of the
          Investor to fully exercise its rights under this
          Agreement, including its rights to acquire Voting
          Securities hereunder (but assuming for purposes hereof
          that the Investor owned Voting Securities equal to the
          then applicable Ownership Cap) or to designate Investor
          Nominees for election or appointment to the Board or to
          have such Board members participate as Board members in
          the management of the business and affairs of the
          Company), then, at the written request of the Investor,
          both parties will use commercially reasonable efforts to
          seek approval of the Commission or its staff that would
          permit the Investor to account (or, if such accounting
          has theretofore been allowed, to permit the Investor to
          continue to account) for its investment in the Company on
          the full equity accounting method (including earnings and
          investments) without the conversion of the Series A
          Convertible Preferred Stock owned by the Investor into
          Common Stock on the terms set forth below. If the
          Commission or its staff shall not have approved such
          accounting within six months after the Investor's written
          request referred to above, the Investor shall have the
          option (the "Optional Conversion Right"), which shall be
          exercisable by the Investor by delivering written notice
          to the Company within 30 days after the end of such six
          month period, to convert all of the Series A Convertible
          Preferred Stock owned by the Investor Group into Common
          Stock as set forth in Section 6(a)(iii) of the
          Certificate of Designation for the Series A Convertible
          Preferred Stock. All Common Stock issued to the Investor
          Group upon exercise of the Optional Conversion Right,
          together with all other shares of Common Stock thereafter
          acquired by the Investor pursuant to the Agreement, shall
          immediately upon each acquisition thereof, be deposited
          by the Investor Group into a permanent voting trust in
          accordance with applicable Law (the "Voting Trust")
          pursuant to a perpetual voting trust agreement in a form
          reasonably satisfactory to the Company, and, with respect
          to matters contained therein which are not specifically
          contemplated hereby, in a form reasonably satisfactory to
          the Investor, and with an independent trust company,
          commercial bank or other financial institution reasonably
          satisfactory to the Company and the Investor designated
          as voting trustee (the "Voting Trustee"). Pursuant to
          such Voting Trust, the aggregate number of Votes as the
          Investor Group would from time to time have been able to
          vote if the Investor had not exercised the Optional
          Conversion Right and continued to own the Series A
          Convertible Preferred Stock will be voted by the Voting
          Trustee at the direction of the Investor consistent with
          how such Votes could have been voted under this Agreement
          if the Optional Conversion Right had not been exercised,
          and the balance of the Votes attributable to all shares
          of Common Stock deposited in the Voting Trust shall be
          voted by the Voting Trustee pro rata in accordance with
          the votes of all shareholders of the Company other than
          the members of the Investor Group and the Other Investor
          Affiliates. The Voting Trust shall provide for the
          release and delivery to the Investor of shares of Common
          Stock, free of the restrictions of the Voting Trust, and
          the termination of the provisions thereof with respect to
          shares of Common Stock, upon transfer of such shares by
          the Investor to unaffiliated parties in accordance with
          the provisions of this Agreement. The parties hereto
          hereby agree to enter into arrangements to permit the
          timely tender into a tender or exchange offer of Common
          Stock subject to the Voting Trust in a manner similar to
          that applied to the Series A Convertible Preferred Stock.
          There shall not be any obligation to deliver any shares
          of Common Stock to the Voting Trust, and the Voting Trust
          shall immediately terminate if it has already been
          established, at such time as all outstanding shares of
          Common Stock (or such securities as the Common Stock has
          been converted into) has the same votes per share if any,
          as all other such shares or other securities, without any
          "time phased" voting.

                    Section 8.9.  HSR Act Filings. Notwithstanding
          anything to the contrary contained in this Agreement, the
          Investor Group shall be entitled to make any HSR Act
          filing in connection with the Investor Group's intention
          to acquire or its acquisition of Common Securities
          pursuant to Section 6.1(A)(a)(iii) or Section 6.7 of this
          Agreement. The Company shall use its reasonable best
          efforts to make all HSR filings required to be made by it
          and to cause any waiting period under HSR Act related to
          the Investor's and its filings to expire as soon as
          practicable.

                                  SECTION 9

                                  CONDITIONS

                    Section 9.1. Conditions of Investor's
          Obligation. The obligation of the Investor to purchase
          and pay for the Shares at the Closing is subject to
          satisfaction or waiver of each of the following
          conditions precedent:

                    (a)  Representations and Warranties; Covenants.
          The representations and warranties of the Company
          contained in this Agreement shall be true and correct in
          all respects on and as of the date of this Agreement. The
          Company shall have in all material respects performed all
          obligations and complied with all agreements,
          undertakings, covenants and conditions required hereunder
          to be performed by it at or prior to the Closing.

                    (b) Compliance with Laws; No Adverse Action or
          Decision. No Governmental Entity of competent
          jurisdiction shall have issued any Order restraining,
          enjoining or otherwise prohibiting the consummation of
          the transactions contemplated by the Transaction
          Agreements. No action, suit or other proceeding by any
          Governmental Entity shall have been instituted that seeks
          to restrain, enjoin, prohibit or otherwise make illegal
          the performance of any of the Transaction Agreements or
          the consummation of the transactions contemplated hereby
          or thereby.

                    (c) Consents. All Regulatory Approvals from any
          Governmental Entity and all consents, waivers or
          approvals from any other Person required for or in
          connection with the execution and delivery of the
          Transaction Agreements and the consummation at the
          Closing by the parties hereto and thereto of the
          transactions contemplated hereby and thereby shall have
          been obtained or made on terms reasonably satisfactory to
          the Investor, except for the failures to obtain such
          Regulatory Approvals, consents, waivers and approvals
          which would not reasonably be expected to have a Material
          Adverse Effect, and the waiting period specified under
          the HSR Act shall have expired or been terminated.

                    (d) Transaction Agreements. The Investor shall
          have received counterpart originals or certified or other
          copies of the Transaction Agreements.

                    (e) Registration Rights Agreements. The
          Investor shall have received a fully executed counterpart
          of the Registration Rights Agreement and the Registration
          Rights Agreement shall be in full force and effect.

                    (f) Consummation of Certain Transactions. The
          closing under the Joint Venture Agreement, and all
          transactions to be consummated in connection therewith,
          shall have occurred.

                    Section 9.2. Conditions of the Company's
          Obligation. The obligation of the Company to issue and
          sell the Shares at the Closing is subject to satisfaction
          or waiver of each of the following conditions precedent:

                    (a) Representations and Warranties; Covenants.
          The representations and warranties of the Investor
          contained in this Agreement shall be true and correct on
          and as of the date of this Agreement. The Investor shall
          have in all material respects performed all obligations
          and complied with all agreements, undertakings, covenants
          and conditions required hereunder to be performed by it
          at or prior to the Closing.

                    (b) Compliance with Laws; No Adverse Action or
          Decision. No Governmental Entity of competent
          jurisdiction shall have issued any Order restraining,
          enjoining or otherwise prohibiting the consummation of
          the transactions contemplated by the Transaction
          Agreements. No action, suit or other proceeding by any
          Governmental Entity shall have been instituted that seeks
          to restrain, enjoin, prohibit or otherwise make illegal
          the performance of any of the Transaction Agreements or
          the consummation of the transactions contemplated hereby
          or thereby.

                    (c) Consents. All Regulatory Approvals from any
          Governmental Entity and all consents, waivers or
          approvals required for or in connection with the
          execution and delivery of the Transaction Agreements and
          the consummation at Closing by the parties hereto and
          thereto on terms reasonably satisfactory to the Company,
          of the transactions contemplated hereby and thereby shall
          have been obtained or made, except for the failures to
          obtain such Regulatory Approvals, consents, waivers and
          approvals which would not reasonably be expected to have
          a material adverse effect on the ability of the Investor
          to consummate the transactions contemplated by the
          Transaction Agreements, and the waiting period specified
          under the HSR Act shall have expired or been terminated.

                    (d) Transaction Agreements. The Company shall
          have received all counterpart originals or certified or
          other copies of the Transaction Agreements.

                    (e) Consummation of Certain Transactions. The
          closing under the Joint Venture Agreement, and all
          transactions to be consummated in connection therewith,
          shall have occurred.

                                  SECTION 10

                                 TERMINATION

                    Section 10.1.  Termination. (a)  Subject to
          Section 10.2 hereof, this Agreement may be terminated by
          notice in writing at any time prior to the Closing by
          either the Investor or the Company if: 

                    (i) the Closing shall not have occurred on or
               before August 6, 1998; or

                    (ii)  the Company and the Investor so mutually
               agree in writing.

                    (b)  Subject to Section 10.2 hereof, and
          without limiting any liability of the Company or the
          Investor for any breach of its obligations hereunder,
          this Agreement may be terminated by notice in writing at
          any time prior to the Closing (x) by the Investor if a
          Change in Control Transaction or a Competing Investment
          shall have been consummated or if the Company has entered
          into a binding agreement or a letter of intent with
          respect thereto or (y) by the Company if a Change in
          Control Transaction shall have been consummated or if the
          Company shall have entered into a binding agreement with
          respect thereto.

                    (c) Subject to Section 10.2 hereof, if the
          Closing shall occur, this Agreement may be terminated by
          one year's prior notice in writing by either the Investor
          or the Company which notice may be delivered at any time
          after the 15th anniversary of the date of this Agreement.

                    Section 10.2. Effect of Termination. If this
          Agreement is terminated in accordance with Section 10.1
          hereof, this Agreement shall become null and void and of
          no further force and effect except that (i) the terms and
          provisions of this Section 10.2, Section 8.1(a) and
          Section 11.1 (and, in the event this Agreement was
          terminated in accordance with Section 10.1(c), then
          Section 6.2(d) and Section 6.3(f)) shall remain in full
          force and effect, (ii) so long as any member of the
          Investor Group shall own any Series A Convertible
          Preferred Stock, the provisions of Section 6.2(b) shall
          remain in force and effect, (iii) any termination of this
          Agreement shall not relieve any party hereto from any
          liability for any breach of its obligations hereunder,
          regardless of whether such party terminated this
          Agreement pursuant to Section 10.1(a)(i); and (iv)
          subject to the proviso to the first sentence in Section
          8.2(b) hereof, in the event that a Trigger Event or a
          Release Event shall have occurred, prior to such
          termination, the provisions of Section 6.1(A), Section
          6.2(e), Section 6.3(g), Section 6.6 (to the extent with
          respect to a Trigger Event, as provided in Section 6.10),
          Section 6.7(b) through (e) and Section 6.8 shall remain
          in full force and effect.

                                  SECTION 11

                                MISCELLANEOUS

                    Section 11.1.  Fees and Expenses. Each party
          shall bear its own expenses, including the fees and
          expenses of any Representatives engaged by it, incurred
          in connection with the Transaction Agreements and the
          transactions contemplated hereby and thereby.

                    Section 11.2. Survival. The representations,
          warranties, covenants and agreements contained in or made
          pursuant to this Agreement shall expire as of the
          consummation of the transactions to be completed at the
          Closing, except (i) for the representations and
          warranties contained in Sections 3.1, 3.2, 3.4(c), 4.1
          and 4.2 which shall survive without limitation, and (ii)
          the covenants and agreements contained in or made
          pursuant to this Agreement which by their terms are to
          survive after the Closing, which shall survive for the
          period specified therein, provided, that if a claim or
          notice is given with respect to any representation,
          warranty, covenant or agreement prior to any such
          expiration date, the claim with respect to such
          representation, warranty, covenant or agreement shall
          continue indefinitely until such claim is finally
          resolved.

                    Section 11.3. Notices. All notices and other
          communications hereunder shall be in writing and shall be
          deemed to have been duly given, if delivered personally,
          by telecopier or sent by first class mail, postage
          prepaid, as follows:

               (a)  If to the Company, to:

                    Pioneer Hi-Bred International, Inc,
                    700 Capital Square
                    Des Moines, Iowa  50309
                    Attention:  General Counsel
                    Telephone:  515-248-4800
                    Telecopier:  515-248-4844

                    With a copy to:

                    Fried, Frank, Harris, Shriver & Jacobson
                    One New York Plaza
                    New York, New York 10044
                    Attention:  Stephen Fraidin, Esq.
                    Telephone:  212-859-8000
                    Telecopier:  212-859-4000

               (b)  If to the Investor, to:

                    E.I. du Pont de Nemours and Company
                    Agricultural Products
                    Barley Mill Plaza #38
                    P.O. Box 80038
                    Wilmington, DE  19880-0038
                    Attention:  William F. Kirk,
                    Vice President and General Manager
                    Telephone:  302-774-1000
                    Telecopier:  302-992-6184

                    With a copy to:

                    Skadden, Arps, Slate, Meagher
                      & Flom, LLP
                    919 Third Avenue
                    New York, New York 10022
                    Attention:  Lou R. Kling, Esq.
                    Telephone:  212-735-3000
                    Telecopier:  212-735-2000

                    (c) If to any other holder of capital stock of
          the Company, addressed to such holder at the address of
          such holder in the record books of the Company; or to
          such other address or addresses as shall be designated in
          writing. All notices shall be effective when received.

                    Section 11.4.  Entire Agreement; Amendment.
          This Agreement and the documents described herein or
          attached or delivered pursuant hereto (including, without
          limitation, the Registration Rights Agreement and the
          Rights Agreement Amendment) and the Confidentiality
          Agreement set forth the entire agreement between the
          parties hereto with respect to the matters provided
          herein and therein. Any provision of this Agreement may
          be amended or modified in whole or in part at any time by
          an agreement in writing among the parties hereto executed
          in the same manner as this Agreement. No failure on the
          part of any party to exercise, and no delay in
          exercising, any right shall operate as waiver thereof,
          nor shall any single or partial exercise by either party
          of any right preclude any other or future exercise
          thereof or the exercise of any other right.

                    Section 11.5. Counterparts. This Agreement may
          be executed in two or more counterparts, each of which
          shall be deemed to constitute an original, but all of
          which together shall constitute one and the same
          document.

                    Section 11.6. Governing Law; Submission to
          Jurisdiction. This Agreement shall be governed by, and
          interpreted, in accordance with, the laws of the State of
          Iowa applicable to contracts made and to be performed in
          that state. The parties hereto irrevocably (a) submit to
          the exclusive personal jurisdiction of any state or
          federal court in the State of Illinois in any suit,
          action or other legal proceeding relating to this
          Agreement; (b) agree that all claims in respect of any
          such suit, action or other legal proceeding may be heard
          and determined in, and enforced in and by, any such
          court; and (c) waive any objection that they may now or
          hereafter have to venue in any such court or that such
          court is an inconvenient forum.

                    Section 11.7. Successors and Assigns. Except as
          otherwise expressly provided herein, the provisions
          hereof shall inure to the benefit of, and be binding
          upon, the Company's successors and assigns. 

                    Section 11.8. Assignment. Except as otherwise
          expressly provided in the last sentence of Section 6.9
          hereof, neither this Agreement nor any rights or
          obligations hereunder shall be assignable.

                    Section 11.9. Remedies; Waiver. To the extent
          permitted by Law, all rights and remedies existing under
          this Agreement and any related agreements or documents
          are cumulative to, and are exclusive of, any rights or
          remedies otherwise available under applicable Law. No
          failure on the part of any party to exercise, or delay in
          exercising, any right hereunder shall be deemed a waiver
          thereof, nor shall any single or partial exercise
          preclude any further or other exercise of such or any
          other right.

                    Section 11.10. Specific Performance. Each party
          hereto acknowledges that, in view of the uniqueness of
          the transactions contemplated by this Agreement, the
          other party would not have an adequate remedy at law for
          money damages in the event that this Agreement has not
          been performed in accordance with its terms. Each party
          therefore agrees that the other party shall be entitled
          to specific enforcement of the terms hereof in addition
          to any other remedy to which it may be entitled, at law
          or in equity.

                    Section 11.11. Severability. If any provision
          of this Agreement is determined to be invalid, illegal,
          or unenforceable, the remaining provisions of this
          Agreement shall remain in full force and effect provided
          that the economic and legal substance of the transactions
          contemplated is not affected in any manner materially
          adverse to any party. In the event of any such
          determination, the parties agree to negotiate in good
          faith to modify this Agreement to fulfill as closely as
          possible the original intent and purpose hereof. To the
          extent permitted by law, the parties hereby to the same
          extent waive any provision of law that renders any
          provision hereof prohibited or unenforceable in any
          respect.

                    IN WITNESS WHEREOF, this Agreement has been
          executed on behalf of the parties hereto by their
          respective duly authorized officers, all as of the date
          first above written.

                              PIONEER HI-BRED INTERNATIONAL, INC.

                              By:______________________________________
                              Name:  Charles S. Johnson
                              Title: President and Chief Executive
                                       Officer

                              E.I. DU PONT DE NEMOURS AND COMPANY

                              By:______________________________________
                              Name:
                              Title:



                                      EXHIBIT A
                        Form of Registration Rights Agreement
                                          
                            REGISTRATION RIGHTS AGREEMENT
                                          
                              REGISTRATION RIGHTS AGREEMENT (this
          "Agreement") dated as of ____________, 1997 between
          Pioneer Hi-Bred International, Inc., an Iowa corporation
          (the "Company"), and E.I. du Pont de Nemours and Company,
          a Delaware corporation (the "Holder").

                                      RECITALS
                                          
                              WHEREAS, the Holder has purchased
          from the Company pursuant to an Investment Agreement,
          dated as of _____________ ___, 1997 (the "Investment
          Agreement"), between the Company and the Holder, shares
          of the Company's Series A Convertible Preferred Stock,
          par value $.01 per share (the "Series A Convertible
          Preferred Stock");

                              WHEREAS, the parties hereto desire to
          set forth the Holder's rights and the Company's
          obligations with respect to the registration of the
          Registrable Securities pursuant to the Securities Act;
          and

                              WHEREAS, the execution and delivery
          of this Agreement by the parties hereto is a condition to
          the obligations of each of the Company and the Holder
          under the Investment Agreement; 

                              NOW, THEREFORE, in consideration of
          the covenants and agreements of the Holder and the
          Company contained herein and in the Investment Agreement
          and for other good and valuable consideration, the
          receipt and sufficiency of which are hereby acknowledged,
          the parties hereto agree as follows:

                                   Section 1.  Definitions and Usage.

                                   As used in this Agreement:

                                   1.1.  Definitions.

                                   "Board" shall mean the Board of
               Directors of the Company.

                                   "Class B Common Stock" shall mean the
               Class B Common Stock of the Company, if and when
               authorized and issued to the Holder.

                                   "Closing" shall mean the closing for
               the purchase of the Series A Convertible Preferred Stock
               pursuant to the Investment Agreement.

                                   "Closing Date" shall mean the date of
               the Closing.

                                   "Commission" shall mean the
               Securities and Exchange Commission.

                                   "Common Stock" shall mean the Common
               Stock, par value $1.00 per share, of the Company.

                                   "Continuously Effective," with
               respect to a specified registration statement, shall mean
               that such registration statement shall not cease to be
               effective and available for transfers of Registrable
               Securities thereunder for longer than either (i) any ten
               (10) consecutive business days, or (ii) an aggregate of
               fifteen (15) business days during the period specified in
               the relevant provision of this Agreement.

                                   "Demand Registration" shall have the
               meaning set forth in Section 2.1(i).

                                   "Exchange Act" shall mean the
               Securities Exchange Act of 1934, as amended.

                                   "Investment Agreement" shall have the
               meaning set forth in the first Recital to this Agreement.

                                   "Investor Group" shall have the
               meaning specified in the Investment Agreement.

                                   "Permitted Holder Group Transferee"
               shall mean any wholly owned (other than directors'
               qualifying shares) United States subsidiary of the Holder
               which, at the time of determination, owns shares of
               Series A Convertible Preferred Stock or Class B Common
               Stock acquired from the Holder during the term of the
               Investment Agreement and in accordance with terms
               thereof.

                                   "Person" shall mean any individual,
               corporation, partnership, limited liability company,
               joint venture, association, trust, unincorporated
               organization or other entity.

                                   "Piggyback Registration" shall have
               the meaning set forth in Section 3.

                                   "Register," "registered," and
               "registration" shall refer to a registration effected by
               preparing and filing a registration statement or similar
               document in compliance with the Securities Act, and the
               declaration or ordering by the Commission of
               effectiveness of such registration statement or document.

                                   "Registrable Securities" shall mean
               the Common Stock issuable upon conversion of the Series A
               Convertible Preferred Stock or Class B Common Stock
               (which conversion shall be deemed to occur upon the sale
               of such shares of Series A Convertible Preferred Stock or
               Class B Common Stock to the underwriter or underwriters
               in connection with any Registration hereunder) which
               Series A Convertible Preferred Stock or Class B Common
               Stock the Holder, or any Permitted Holder Group
               Transferee acquires in accordance with the Investment
               Agreement and which is owned by the Holder or such
               Permitted Holder Group Transferee on the date of
               determination; provided, however, that Registrable
               Securities shall not include any security of the Company
               acquired by the Holder or any member of the Investor
               Group other than in accordance with or in violation of
               the terms of the Investment Agreement.  In the event that
               the Common Stock is converted into any other security
               pursuant to any merger, consolidation, recapitalization,
               liquidation or other similar transaction, and if any
               securities are distributed in respect of any Registrable
               Securities, then all of such securities shall be
               considered Registrable Securities for purposes of this
               Agreement.

                                   "Registration Expenses" shall have
               the meaning set forth in Section 7.1.

                                   "Securities Act" shall mean the
               Securities Act of 1933, as amended.

                                   "Shelf Registration" means a
               Registration Statement effected pursuant to Section 4.

                                   "Shelf Registration Event" means the
               receipt by the Company from the Investor at any time
               following the occurrence of a Surviving Change in Control
               Transaction, a Release Event or a Trigger Event (each, as
               defined in the Investment Agreement) of a written request
               to file a shelf registration statement in accordance with
               Section 4 provided that in no event may the Investor give
               such notice at any time that the Total Ownership
               Percentage (or percentage ownership of the common equity
               of any other company or entity surviving a Surviving
               Change in Control Transaction) of the Investor Group is
               10% or more.  In the event of a Surviving Change in
               Control Transaction, or in the event the Company or other
               company or entity that survives a Surviving Change in
               Control Transaction determines that the provisions of
               Section 8.2(b)(i) of the Investment Agreement will not
               apply to the Company or such surviving company or entity,
               references herein to the Company shall apply to the
               Company or other entity surviving such Change in Control
               Transaction (the "Standstill Successor") but in the event
               of any other Change in Control Transaction, the
               provisions of Section 4 herein shall terminate.

                                   "Shelf Registration Statement" means
               a Registration Statement of the Company filed with the
               Commission or Form S-3 (or any successor form) for an
               offering to be made on a continuous basis pursuant to
               Rule 415 under the Securities Act (or any similar rule
               that may be adopted by the Commission) covering some or
               all of the Registrable Securities, as applicable.

                                   "Transfer" shall mean and include the
               act of selling, giving, transferring, creating a trust
               (voting or otherwise), assigning or otherwise disposing
               of (other than pledging, hypothecating or otherwise
               transferring as security) (and correlative words shall
               have correlative meanings); provided, however, that any
               transfer or other disposition upon foreclosure or other
               exercise of remedies of a secured creditor after an event
               of default under or with respect to a pledge,
               hypothecation or other transfer as security shall
               constitute a "Transfer."

                                   "Underwriters' Representative" shall
               mean the managing underwriter, or, in the case of a
               co-managed underwriting, the managing underwriter
               designated as the Underwriters' Representative by the
               co-managers.

                                   "Violation" shall have the meaning
               set forth in Section 8.1.

                                   1.2.  Usage.

                                   (i)  References to a Person are also
               references to its successors in interest (by means of
               merger, consolidation or sale of all or substantially all
               the assets of such Person or otherwise, as the case may
               be) and permitted assigns.

                                   (ii)  References to a document are to
               it as amended, waived and otherwise modified from time to
               time and references to a statute or other governmental
               rule are to it as amended and otherwise modified from
               time to time (and references to any provision thereof
               shall include references to any successor provision). 

                                   (iii)  References to Sections, unless
               the context otherwise requires.

                                   (iv)  The definitions set forth
               herein are equally applicable both to the singular and
               plural forms and the feminine, masculine and neuter forms
               of the terms defined.

                                   (v)  The term "including" and
               correlative terms shall be deemed to be followed by
               "without limitation" whether or not followed by such
               words or words of like import.

                                   (vi)  The term "hereof" and similar
               terms refer to this Agreement as a whole.

                                   (vii)  The "date of" any notice or
               request given pursuant to this Agreement shall be
               determined in accordance with Section 12.2.

                                   Section 2.  Demand Registration.
                
                                   2.1.  (i) At any time after the third
               anniversary of the Closing Date, and subject to
               compliance by the Holder with the provisions of Section 6
               of the Investment Agreement, if the Holder shall make a
               written request to the Company, the Company shall cause
               to be filed with the Commission a registration statement,
               including all exhibits required by the Commission to be
               filed therewith (a "Demand Registration Statement")
               meeting the requirements of the Securities Act for an
               underwritten public offering of Registrable Securities (a
               "Demand Registration"), and the Holder shall be entitled
               to have included therein all or such number of
               Registrable Securities as the Holder shall request in
               writing; provided, however, that no request may be made
               pursuant to this Section 2.1 if within twelve (12) months
               prior to the date of such request a Demand Registration
               Statement pursuant to this Section 2.1 shall have been
               declared effective by the Commission.  Any request made
               pursuant to this Section 2.1 shall be addressed to the
               attention of the Secretary of the Company, and shall
               specify the number of Registrable Securities to be
               registered (which shall be not less than 1,500,000
               shares, provided, however that the Holder may request
               registration of any amount of Registrable Securities
               where the Holder requests registration (i) of all of its
               remaining Registrable Securities, or (ii) pursuant to its
               last Demand Registration right), the intended method of
               distribution thereof and that the request is for a Demand
               Registration pursuant to this Section 2.1(i).

                                   (ii)  The Company shall be entitled
               to postpone for up to 180 days, but in no event more than
               180 days during any 24 month period and no sooner than
               180 days after the end of any prior postponement under
               this Section 2.1(ii) or any holdback period described in
               the first sentence of Section 9.1 the filing of any
               Demand Registration Statement otherwise required to be
               prepared and filed pursuant to this Section 2.1 (or delay
               seeking effectiveness of a Demand Registration Statement
               which has been filed), if the Board determines, in its
               reasonable good faith judgment, that such Demand
               Registration would materially interfere with, or require
               premature disclosure of, any material financing,
               acquisition, reorganization or other material transaction
               involving the Company or any of its subsidiaries and the
               Company promptly gives the Holder notice of such
               determination.

                                   2.2.  Following receipt of a request
               for a Demand Registration, the Company shall:

                                   (i)  File the Demand Registration
               Statement with the Commission as promptly as reasonably
               practicable, and, subject to Section 2.1(ii), shall use
               the Company's commercially reasonable efforts to have the
               Demand Registration Statement declared effective under
               the Securities Act as soon as reasonably practicable, in
               each instance giving due regard to the need to prepare
               current financial statements, conduct due diligence and
               complete other actions that are reasonably necessary to
               effect a registered public offering.

                                   (ii)  Use the Company's commercially
               reasonable efforts to keep the relevant registration
               statement Continuously Effective, if a Demand
               Registration Statement, for up to 60 days or until such
               earlier date as of which all the Registrable Securities
               under the Demand Registration Statement shall have been
               disposed of in the manner described in the Registration
               Statement, or such longer period (but in no event longer
               than 120 days) as in the judgment of counsel for the
               underwriters a prospectus is required by law to be
               delivered in connection with sales of Registrable
               Securities by an underwriter or dealer in accordance with
               plan of distribution included in such Demand Registration
               Statement.  Notwithstanding the foregoing, if for any
               reason the effectiveness of a Demand Registration
               Statement pursuant to this Section 2 is delayed or
               suspended or filing of the Demand Registration Statement
               or seeking effectiveness thereof is postponed as
               permitted by Section 2.1(ii), the commencement of the
               foregoing period shall be extended by the aggregate
               number of days of such suspension or postponement.

                                   2.3.  The Company shall be obligated
               to effect not more than six Demand Registrations, subject
               to the provisions of Section 4.1.  For purposes of the
               preceding sentence, a Demand Registration shall not be
               deemed to have been effected (i) unless a Demand
               Registration Statement with respect thereto has become
               effective, (ii) if after such Demand Registration
               Statement has become effective, such Demand Registration
               Statement or the related offer, sale or distribution of
               Registrable Securities thereunder is interfered with by
               any stop order, injunction or other order or requirement
               of the Commission or other governmental agency or court
               for any reason not attributable to the Holder and such
               interference is not thereafter eliminated, or (iii) if
               the conditions to closing specified in the underwriting
               agreement entered into in connection with such
               registration are not satisfied or waived, other than by
               reason of a failure on the part of the Holder.  If the
               Company shall have complied with its obligations under
               this Agreement, a right to demand a registration pursuant
               to this Section 2 shall be deemed to have been satisfied
               upon the earlier of (x) the date as of which all of the
               Registrable Securities included therein shall have been
               distributed pursuant to the Registration Statement, and
               (y) the date as of which such Demand Registration shall
               have been Continuously Effective for a 60-day period or
               other period specified in 2.2(ii) following the
               effectiveness of such Demand Registration Statement,
               provided no stop order or similar order, or proceedings
               for such an order, is thereafter entered or initiated.

                                   2.4.  A registration pursuant to this
               Section 2 shall be on such appropriate registration form
               of the Commission as shall (i) be selected by the Company
               and be reasonably acceptable to the Holder, and (ii)
               permit the distribution of the Registrable Securities in
               accordance with the intended method or methods of
               distribution specified in the request pursuant to Section
               2.1(i).

                                   2.5.  The Holder shall have the right
               to select the underwriter or underwriters and manager or
               managers to administer such offering; provided, however,
               that each Person so selected shall be acceptable to the
               Company in its reasonable judgment.

                                   2.6.  The Company may not include in
               a Demand Registration pursuant to Section 2.1 shares of
               Common Stock for the account of the Company or any
               subsidiary of the Company, but may include shares of
               Common Stock for the account of any other person or
               entity who holds shares of Common Stock; provided,
               however, that if the Underwriters' Representative of any
               offering described in this Section 2.6 shall have
               informed the Company in writing that in its opinion the
               total number of shares of Common Stock that the Holder,
               and any other persons or entities desiring to participate
               in such registration intend to include in such offering
               is such as to materially and adversely affect the success
               or pricing of such offering, then the Company shall
               include in such Demand Registration all Registrable
               Securities requested to be included in such registration
               by the Holder together with up to such additional number
               of shares of Common Stock that any other persons or
               entities entitled to participate in such registration
               desire to include in such registration and that the
               Underwriters' Representative has informed the Company may
               be included in such registration without adversely
               affecting the success of pricing of such offering;
               provided that the number of shares of Common Stock to be
               offered for the account of all such other persons and
               entities participating in such registration shall be
               reduced or limited pro rata in proportion to the
               respective number of shares of Common Stock requested to
               be registered by such persons and entities to the extent
               necessary to reduce the respective total number of shares
               of Common Stock requested to be included in such offering
               to the number of shares of Common Stock recommended by
               such Underwriters' Representative.

                                   Section 3.  Piggyback Registration.

                                   3.1.  If at any time after the third
               anniversary of the Closing Date, the Company proposes to
               register (including for this purpose a registration
               effected by the Company for the account of the Company or
               shareholders of the Company other than the Holder) shares
               of Common Stock or securities convertible or exercisable
               into shares of Common Stock under the Securities Act in
               connection with the public offering solely for cash on
               Form S- 1, S-2 or S-3 (or any replacement or successor
               forms) as soon as practicable (but in not event less than
               ten (10) business days prior to the date of filing any
               related Registration Statement), the Company shall
               promptly give the Holder written notice of such
               registration (a "Piggyback Registration").  Upon the
               written request of the Holder given within 10 days
               following the date of such notice, the Company shall use
               commercially reasonable efforts to cause to be included
               in such registration statement (a "Piggyback Registration
               Statement," the Shelf Registration Statement,  the Demand
               Registration Statement and Piggyback Registration
               Statement are hereinafter called collectively,
               "Registration Statements" and, individually, a
               "Registration Statement"), and use its commercially
               reasonable efforts to cause to be registered under the
               Securities Act all the Registrable Securities that the
               Holder shall have requested to be registered. The Company
               shall have the absolute right to withdraw or cease to
               prepare or file any Piggyback Registration Statement for
               any offering referred to in this Section 3 without any
               obligation or liability to the Holder; provided, that the
               Company shall promptly notify the Holder in writing of
               any such action.

                                   3.2.  If the Piggyback Registration
               Statement relates to an underwritten offering of Common
               Stock or securities convertible or exercisable into
               shares of Common Stock and if the Underwriters'
               Representative of such underwritten offering shall inform
               the Company that in its opinion the inclusion in such
               underwritten distribution of all or a specified number of
               such Registrable Securities or of any other shares of
               Common Stock requested to be included would materially
               and adversely effect the success or pricing of such
               offering or of such distribution by the underwriters,
               then the Company may, upon written notice to the Holder,
               exclude from such underwritten offering (i) in the event
               the Piggyback Registration Statement relates to an
               offering for the account of the Company, shares of Common
               Stock requested to be included by any persons or entities
               other than the Company, pro rata in proportion to the
               respective number of shares of Common Stock requested to
               be included by such persons and entities, to the extent
               necessary to reduce the respective total number of shares
               of Common Stock requested to be included in such offering
               to the number of shares of Common Stock recommended by
               such Underwriters' Representative and (ii) in the event
               the Piggyback Registration Statement relates to an
               offering for the account of any person or entity other
               than the Company, (A) first, shares of Common Stock
               requested to be registered for the account of any persons
               or entities other than the person or entity making the
               initial request for such registration (the "Requesting
               Party"), pro rata in proportion to the respective number
               of shares of Common Stock requested to be registered by
               such other persons and entities to the extent necessary
               to reduce the respective total number of shares of Common
               Stock requested to be included in such offering to the
               number of shares of Common Stock recommended by such
               Underwriters' Representative, (B) second, to the extent
               reduction as a result of clause (A) is insufficient,
               shares of Common Stock requested to be registered for the
               account of the Company, and (C) third, to the extent
               reduction as a result of clauses (A) and (B) is
               insufficient, shares of Common Stock requested to be
               registered for the account of the Requesting Party.

                                   The Company may decline to file a
               Piggyback Registration Statement referred to in this
               Section 3.2 after giving notice to the Holder, or
               withdraw such a Piggyback Registration Statement after
               filing, or otherwise abandon any such proposed
               underwritten offering; provided that the Company shall
               promptly notify the Holder in writing of any such action.

                                   3.3.  The Holder may not participate
               in any underwritten offering under Section 2.1 or Section
               3.1 hereof unless it completes and executes all customary
               questionnaires, powers of attorney, custody agreements,
               underwriting agreements, and other customary documents
               required under the customary terms of such underwriting
               arrangements.  In connection with any underwritten
               offering under Section 2.1, 3.1 or 4.1, each of the
               Holder and the Company shall be a party to the
               underwriting agreement with the underwriters and may be
               required to make certain customary representations and
               warranties (in the case of the Holder only as to the
               Registrable Securities being sold by the Holder and any
               Permitted Group Transferee in such underwritten offering
               and the plan of distribution thereof) and provide certain
               customary indemnifications for the benefit of the
               underwriters.

                                   3.4.  The Holder shall be entitled to
               have its Registrable Securities included in an unlimited
               number of Piggyback Registrations pursuant to this
               Section 3.

                                   Section 4.  Shelf Registration.

                                   4.1.  Upon the occurrence of a Shelf
               Registration Event, the Company shall file with the
               Commission as promptly as practicable, but in no event
               later than 20 business days after the Shelf Registration
               Event, a Shelf Registration Statement relating to the
               offer and sale of the Registrable Securities by the
               Holder and the Permitted Holder Group Transferees from
               time to time in accordance with the methods of
               distribution elected by the Holder and set forth in such
               Shelf Registration Statement and, thereafter, shall use
               its commercially reasonable efforts to cause such Shelf
               Registration Statement to be declared effective under the
               Securities Act as promptly as practicable.  If, on the
               occurrence of a Shelf Registration Event, the Company
               does not qualify to file a Shelf Registration Statement,
               then the Holder shall be entitled to one additional
               Demand Registration pursuant to Section 3, but at any
               time thereafter that the Company does so qualify, it
               shall, as promptly as practicable, file a Shelf
               Registration Statement.

                                   4.2.  The Company shall use its
               commercially reasonable efforts to keep the Shelf
               Registration Statement continuously effective in order to
               permit the prospectus forming part thereof to be usable
               by the Holder and the Permitted Holder Group Transferees
               for a period ending on the date twenty-four months (the
               "Shelf Maintenance Period") after the occurrence of the
               Shelf Registration Event (such date to be extended by the
               aggregate number of days any Shelf Registration Statement
               shall be subject to a Shelf Suspension) or such shorter
               period as shall terminate when all the Registrable
               Securities covered by the Shelf Registration Statement
               have been sold pursuant to the Shelf Registration
               Statement (but in no event prior to the applicable period
               referred to in Section 4(3) of the Act and Rule 174
               thereunder) (such period being the "Shelf Period").

                                   4.3.  The Company shall be entitled
               to postpone the filing of any Shelf Registration
               Statement otherwise required to be prepared and filed
               pursuant to this Section 4 (or delay seeking, or
               maintaining continued, effectiveness of a Shelf
               Registration Statement that has been filed) if the Board
               determines in its reasonable good faith judgment, that
               such Shelf Registration would materially interfere with,
               or require premature disclosure of, any material
               financing, acquisition, reorganization or other material
               transaction involving the Company or any of its
               subsidiaries and the Company gives the Holder notice of
               such determination (a "Shelf Suspension"); provided,
               however, that the Company shall not have postponed
               pursuant to this Section 4.3, the commencement of the
               filing of, delay the seeking the effectiveness of, or
               suspend the use of any Shelf Registration Statement
               otherwise required to be prepared and filed pursuant to
               this Section 4, (i) more than 180 days during the Shelf
               Maintenance Period, (ii) for a period exceeding 180 days
               on any one occasion during or (iii) sooner than 90 days
               after the end of any prior Shelf Suspension and provided,
               further, that the Shelf Maintenance Period shall be
               extended by the aggregate number of days of each Shelf
               Suspension.  In the case of a Shelf Suspension, the
               notice required above shall request the Holder to suspend
               any sale or purchase, or offer to sell or purchase the
               Registrable Securities, and to suspend any sale or
               purchase, or offer to sell or purchase the Registrable
               Securities, and to suspend use of the prospectus related
               to the Shelf Registration in connection with any such
               sale or purchase or offer to sell or purchase.  The
               Company shall immediately notify the Holder upon the
               termination of any Shelf Suspension, shall amend or
               supplement the related prospectus, if necessary, so it
               does not contain any untrue statement or omission therein
               and shall furnish to the holders such numbers of copies
               of the prospectus as so amended or supplemental as the
               Holder may reasonably request.  The Holder will advise
               the Company by at least 5 business days' prior written
               notice if the Holder intends to make any sale under the
               Shelf Registration Statement that would constitute a
               "distribution" for purposes of Regulation M under the
               Securities Act.

                                   4.4.  The Holder shall have the right
               to effect an underwritten offering covering not fewer
               than 1,500,000 shares pursuant to a Shelf Registration
               (in which case each such underwritten offering shall
               constitute a Demand Registration for purposes of Section
               2.3) and to select the underwriter or underwriters and
               manager or managers to administer any offering pursuant
               to a Shelf Registration; provided, however, that each
               Person so selected shall be acceptable to the Company in
               its reasonable judgment.

                                   Section 5.  Registration Procedures.

                                   Whenever required under Section 2,
               Section 3 or Section 4 to effect the registration of any
               Registrable Securities, the Company shall, as
               expeditiously as practicable:

                                   5.1.  Prepare and file with the
               Commission a Registration Statement, including all
               exhibits required by the Commission to be filed
               therewith, with respect to such Registrable Securities
               and, subject to Section 2.1 and Section 4.3, use the
               Company's commercially reasonable efforts to cause such
               Registration Statement to become effective; provided,
               however, that before filing a Registration Statement or
               prospectus or any amendments or supplements thereto,
               including documents incorporated by reference after the
               initial filing of the Registration Statement and prior to
               effectiveness thereof, the Company shall furnish to
               counsel for the Holder and underwriters, copies of all
               such documents in the form substantially as proposed to
               be filed with the Commission at a reasonable time prior
               to filing for review and comment by such counsel.

                                   5.2.  Prepare and file with the
               Commission such amendments and supplements to such
               Registration Statement and the prospectus used in
               connection with such Registration Statement as may be
               necessary to comply with the provisions of the Securities
               Act and rules thereunder with respect to the distribution
               of all securities covered by such Registration Statement
               and as may be reasonably requested by the Holder or
               necessary to keep such Registration Statement effective
               pursuant to Section 2.2(i) and 4.2.  If the registration
               is for an underwritten offering, the Company shall amend
               the Registration Statement or supplement the prospectus
               whenever required by the terms of the underwriting
               agreement.  Pending such amendment or supplement the
               Holder and all other members of the Investor Group, upon
               written notice by the Company, shall cease making offers
               or Transfers of Registrable Securities pursuant to the
               prior prospectus.  In the event that any Registrable
               Securities included in a Registration Statement subject
               to, or required by, this Agreement remain unsold at the
               end of the period during which the Company is obligated
               to use its commercially reasonable efforts to maintain
               the effectiveness of such Registration Statement, the
               Company may file a post-effective amendment to the
               Registration Statement for the purpose of removing such
               Securities from registered status.

                                   5.3.  Notify the Holder and the
               Underwriters' Representative and (if requested) confirm
               such advise in writing, as soon as practicable after
               notice thereof is received by the Company (i) when the
               Registration Statement or any amendment thereto has been
               filed or becomes effective, the prospectus or any
               amendment or supplement to the prospectus included
               therein has been filed, and, to furnish the Holder and
               the underwriters with copies thereof, (ii) of any request
               by the Commission for amendments or supplements to the
               Registration Statement or the prospectus included therein
               or for additional information, (iii) if at any time the
               representations and warranties of the Company
               contemplated by Section 3.3 cease to be true and correct,
               and (iv) of the receipt by the Company of any
               notification with respect to the suspension or
               qualification of the Registrable Securities for offering
               or sale in any jurisdiction or the initiation or
               threatening of any proceeding for such purpose.

                                   5.4.  Promptly notify the Holder and
               the Underwriters' Representative, if any, at any time
               when a prospectus relating thereto is required to be
               delivered under the Securities Act when the Company
               becomes aware of the happening of any event as a result
               of which the prospectus included in any Registration
               Statement (as then in effect) contains any untrue
               statement of a material fact or omits to state a material
               fact necessary to make the statements therein (in the
               case of the prospectus and any preliminary prospectus, in
               light of the circumstances under which they were made)
               when such prospectus was delivered not misleading or, if
               for any other reason it shall be necessary during such
               time period to amend or supplement the prospectus in
               order to comply with the Securities Act and, in either
               case as promptly as practicable thereafter, prepare and
               file with the Commission, and furnish without charge to
               the Holder and the Underwriters' Representative, if any,
               a supplement or amendment to such prospectus which will
               correct such statement or omission or effect such
               compliance.

                                   5.5.  If requested by the
               Underwriters' Representative or the Holder, promptly
               incorporate in a prospectus supplement or post-effective
               amendment such information as the Underwriters'
               Representative and the Holder agree should be included
               therein relating to the plan of distribution with respect
               to such Registrable Securities, including, without
               limitation, information with respect to the number of
               Registrable Securities being sold to such underwriters,
               the purchase price being paid therefor by such
               underwriters and with respect to any other terms of the
               underwritten (or best efforts underwritten) offering of
               Registrable Securities to be sold in such offering; and
               make all required filings of such prospectus supplement
               or post-effective amendment as soon as notified of the
               matters to be incorporated in such prospectus supplement
               or post-effective amendment.

                                   5.6.  Cooperate with the Holder and
               the Underwriters' Representatives to facilitate the
               timely preparation and delivery of certificates
               representing Registrable Securities to be sold and not
               bearing any restrictive legends; and enable such
               Registrable Securities to be in such denomination and
               registered in such names as the Underwriters'
               Representative may request at least two business days
               prior to the sale of Registrable Securities to the
               underwriters.

                                   5.7.  Cooperate with the Holders in
               connection with any filings required to be made with the
               National Association of Securities Dealers, Inc. (the
               "NASD"), and otherwise use its best efforts to comply
               with the rules, by-laws and regulations of the NASD as
               they apply to the registration.

                                   5.8.  Furnish to the Holder such
               numbers of copies of the Registration Statement, any
               pre-effective or post-effective amendment thereto, the
               prospectus, including each preliminary prospectus and any
               amendments or supplements thereto, in each case in
               conformity with the requirements of the Securities Act
               and the rules thereunder, and such other related
               documents as the Holder may reasonably request in order
               to facilitate the distribution of Registrable Securities
               owned by the Holder. 

                                   5.9.  Use the Company's commercially
               reasonable efforts (i) to register and qualify the
               securities covered by such Registration Statement under
               such other securities or blue sky laws of such states or
               jurisdictions as shall be reasonably requested by the
               Underwriters' Representative, and (ii) to obtain the
               withdrawal of any order suspending the effectiveness of a
               Registration Statement, or the lifting of any suspension
               of the qualification (or exemption from qualification) of
               the offer and transfer of any of the Registrable
               Securities in any jurisdiction, at the earliest possible
               moment; provided, however, that the Company shall not be
               required in connection therewith or as a condition
               thereto to qualify to do business or to file a general
               consent to service of process in any such states or
               jurisdictions.

                                   5.10.  In the event of any
               underwritten offering, enter into and perform the
               Company's obligations under an underwriting agreement
               (including indemnification and contribution obligations
               of underwriters or agents in the form set forth in
               Section 8), in usual and customary form, with the
               managing underwriter or underwriters of or agents for
               such offering.  The Company shall also cooperate with the
               Holder, and the Underwriters' Representative for such
               offering in the marketing, and customary selling efforts
               relating to the Registrable Securities, including
               participating in customary "road show" presentations as
               may be reasonably requested by the Underwriters'
               Representative.

                                   5.11.  Promptly notify the Holder of
               any stop order issued or threatened to be issued by the
               Commission in connection therewith and take all
               reasonable actions required to prevent the entry of such
               stop order or to remove it if entered.

                                   5.12.  Make available for inspection
               by the Holder, any underwriter participating in such
               offering and the representatives of the Holder and such
               underwriter all financial and other information as shall
               be reasonably requested by them, and provide the Holder,
               any underwriter participating in such offering and the
               representatives of the Holder and such underwriter the
               reasonable opportunity to discuss the business affairs of
               the Company with its principal executives and independent
               public accountants who have certified the audited
               financial statements included in such registration
               statement, in each case all as necessary to enable them
               to exercise their due diligence responsibilities under
               the Securities Act; provided, however, that information
               that the Company determines, in its reasonable and good
               faith judgment, to be confidential and which the Company
               advises such Person in writing, is confidential shall not
               be disclosed unless such Person signs a confidentiality
               agreement reasonably satisfactory to the Company and the
               Holder of Registrable Securities agrees to be responsible
               for such Person's breach of confidentiality on terms
               reasonably satisfactory to the Company.

                                   5.13.  Use the Company's commercially
               reasonable efforts to obtain a so-called "comfort letter"
               from its independent public accountants, and legal
               opinions of counsel to the Company addressed to the
               Holder, in customary form and covering such matters of
               the type customarily covered by such letters, and in a
               form that shall be reasonably satisfactory to the Holder. 
               The Company shall furnish to the Holder a signed
               counterpart of any such comfort letter or legal opinion.
               Delivery of any such opinion or comfort letter shall be
               subject to the recipient furnishing such written
               representations or acknowledgments as are customarily
               provided by selling shareholders who receive such comfort
               letters or opinions. 

                                   5.14.  Provide and cause to be
               maintained a transfer agent and registrar for all
               Registrable Securities covered by such Registration
               Statement from and after a date not later than the
               effective date of such Registration Statement.

                                   5.15.  Use commercially reasonable
               efforts to cause the Registrable Securities covered by
               such Registration Statement to continue to be listed on
               all exchanges where the Company's Common Stock is listed
               and to be Registered with or approved by such other
               United States or state governmental agencies or
               authorities as may be necessary by virtue of the business
               and operations of the Company to enable the Holder to
               consummate the distribution of the Registrable Securities
               which are included in such registration.

                                   5.16.  Take such other actions as are
               reasonably required in order to expedite or facilitate
               the registration of Registrable Securities included in
               such registration.

                                   Section 6.  Holder's Obligations.

                                   6.1  It shall be a condition
               precedent to the obligations of the Company to take any
               action pursuant to this Agreement with respect to the
               Registrable Securities which are included in such
               registration that the Holder shall furnish to the Company
               such information regarding the Holder and any
               participating Permitted Holder Group Transferee, the
               number of the Registrable Securities owned by it and any
               participating Permitted Holder Group Transferee, and the
               intended method of distribution of such Registrable
               Securities as shall be required to effect the
               registration of such Registrable Securities, and to
               cooperate with the Company in preparing such
               registration.

                                   6.2  The Holder agrees, and each
               Permitted Holder Group Transferee shall be deemed by
               acceptance of Registrable Securities to have agreed,
               that, upon receipt of any notice of the Company pursuant
               to clauses (ii) through (iv) of Section 5.3 and Section
               5.4 hereof, the Holder and each Permitted Holder Group
               Transferee will discontinue disposition of such
               Registrable Securities covered by such Registration
               Statement until such Holder's or Permitted Holder Group
               Transferee's receipt of copies of the supplemental or
               amended prospectus contemplated by Section 5.4 hereof, or
               until advised in writing (the "Advice") by the Company
               that the use of the applicable prospectus may be resumed.
               If the Company shall give any notice under clauses (ii)
               through (iv) of Section 5.3 or Section 5.4 hereof during
               the period that the Company is required to maintain an
               effective Registration Statement (the "Effectiveness
               Period"), such Effectiveness Period shall be extended by
               the number of days during such period from and including
               the date of the giving of such notice to and including
               the date when each seller of Registrable Securities
               covered by such Registration Statement shall have
               received (x) the copies of the supplemental or amended
               prospectus contemplated by Section 5.4 (if an amended or
               supplemental prospectus is required) or (y) the Advice
               (if no amended or supplemental prospectus is required).

                                   Section 7.  Expenses of Registration. 
               Expenses in connection with registrations pursuant to
               this Agreement shall be allocated and paid as follows:

                                   7.1.  With respect to the first two
               Demand Registrations effected pursuant to Section 2
               hereof, the Company shall bear and pay, and with respect
               to each additional Demand Registration, the Holder shall
               bear and pay, all expenses incurred in connection with
               any registration, filing, or qualification of Registrable
               Securities with respect to such Demand Registration,
               including all registration, filing and National
               Association of Securities Dealers, Inc. fees, all fees
               and expenses of complying with securities or blue sky
               laws, all word processing, duplicating and printing
               expenses, messenger and delivery expenses, and the
               reasonable fees and disbursements of counsel for the
               Company, and of the Company's independent public
               accountants, including the expenses of "cold comfort"
               letters required by or incident to such performance and
               compliance (the "Registration Expenses"), but in no event
               shall the Company bear underwriting discounts and
               commissions relating to Registrable Securities or fees
               and expenses of Holder's counsel (which shall be paid by
               the Holder) and provided that the Company shall not be
               required to pay for any expenses of any registration
               begun pursuant to Section 2 if the registration is
               subsequently withdrawn at the request of the Holder (in
               which case the Holder shall bear such expense), other
               than by reason of failure of the Company to comply with
               Section 5.12 or if the proviso of such section becomes
               applicable unless the Holder agrees that such withdrawn
               registration shall constitute one of the Demand
               Registrations under Section 2 hereof.

                                   7.2.  The Company shall bear and pay
               all Registration Expenses incurred in connection with any
               Shelf Registrations pursuant to Section 4 and any
               Piggyback Registrations pursuant to Section 3 for the
               Holder, but excluding, incremental registration and
               qualification fees and expenses (including underwriting
               discounts and commissions relating to Registrable
               Securities) and any incremental costs and disbursements
               (including fees and expenses of the Holder's counsel)
               that result from the inclusion of the Registrable
               Securities in any Piggyback Registrations (each of which
               shall be paid by the Holder).

                                   Section 8.  Indemnification;
               Contribution.  If any Registrable Securities are included
               in a Registration Statement under this Agreement: 

                                   8.1.  To the extent permitted by
               applicable law, the Company shall indemnify and hold
               harmless the Holder and each Permitted Holder Group
               Transferee, each Person, if any, who controls such Holder
               or Permitted Holder Group Transferee within the meaning
               of the Securities Act, and each officer, director,
               partner, and employee of the Holder and each Permitted
               Holder Group Transferee, and any such controlling Person,
               against any and all losses, claims, damages, liabilities
               and expenses (joint or several), including reasonable
               attorneys' fees and disbursements and expenses of
               investigation, incurred by such party pursuant to any
               actual or threatened action, suit, proceeding or
               investigation, or to which any of the foregoing Persons
               may become subject under the Securities Act, the Exchange
               Act or other federal or state laws, insofar as such
               losses, claims, damages, liabilities and expenses arise
               out of or are based upon any of the following statements,
               omissions or violations (collectively a "Violation"):

                                   (i)  Any untrue statement or alleged
               untrue statement of a material fact contained in such
               registration statement, including any preliminary
               prospectus or final prospectus contained therein, or any
               amendments or supplements thereto;

                                   (ii)  The omission or alleged
               omission to state therein a material fact required to be
               stated therein, or necessary to make the statements
               therein not misleading; or

                                   (iii)  Any violation or alleged
               violation by the Company of the Securities Act, the
               Exchange Act, any applicable state securities law or any
               rule or regulation promulgated under the Securities Act,
               the Exchange Act or any applicable state securities law;

               provided, however, that the indemnification required by
               this Section 8.1 shall not apply to amounts paid in
               settlement of any such loss, claim, damage, liability or
               expense if such settlement is effected without the
               consent of the Company (which consent shall not be
               unreasonably withheld), nor shall the Company be liable
               in any such case for any such loss, claim, damage,
               liability or expense to the extent that it arises out of
               or is based upon a Violation which occurs in reliance
               upon and in conformity with written information furnished
               to the Company by the indemnified party expressly for use
               in connection with such registration; provided, further,
               that the indemnity agreement contained in this Section 8
               shall not apply to any underwriter to the extent that any
               such loss is based on or arises out of an untrue
               statement or alleged untrue statement of a material fact,
               or an omission or alleged omission to state a material
               fact, contained in or omitted from any preliminary
               prospectus if the final prospectus shall correct such
               untrue statement or alleged untrue statement, or such
               omission or alleged omission, and a copy of the final
               prospectus has not been sent or given to such person at
               or prior to the confirmation of sale to such person if
               such underwriter was under an obligation to deliver such
               final prospectus and failed to do so.  The Company shall
               also indemnify underwriters participating in the
               distribution, their officers, directors, agents and
               employees and each person who controls such persons
               (within the meaning of Section 15 of the Securities Act
               or Section 20 of the Exchange Act) to the same extent as
               provided above with respect to the indemnification of the
               Holder provided, however, that no such underwriter shall
               be entitled to indemnification under this Agreement if
               such person shall have entered into a separate
               underwriting or indemnification agreement with the
               Company.

                                   8.2.  To the extent permitted by
               applicable law, the Holder shall indemnify and hold
               harmless the Company, each of its directors, each of its
               officers who shall have signed the registration
               statement, each Person, if any, who controls the Company
               within the meaning of the Securities Act, and each
               officer, director, partner, and employee of the Company
               and such controlling Person, against any and all losses,
               claims, damages, liabilities and expenses (joint and
               several), including reasonable attorneys' fees and
               disbursements and expenses of investigation, incurred by
               such party pursuant to any actual or threatened action,
               suit, proceeding or investigation, or to which any of the
               foregoing may otherwise become subject under the
               Securities Act, the Exchange Act or other federal or
               state laws, insofar as such losses, claims, damages,
               liabilities and expenses arise out of or are based upon
               any Violation, in each case to the extent (and only to
               the extent) that such Violation occurs in reliance upon
               and in conformity with information furnished in writing
               by the Holder specifically for use in connection with
               such registration; provided, further, however, that the
               indemnification required by this Section 8.2 shall not
               apply to amounts paid in settlement of any such loss,
               claim, damage, liability or expense if settlement is
               effected without the consent of the Holder, which consent
               shall not be unreasonably withheld; provided, further,
               however, in no event shall the liability of the Holder be
               greater in amount than the dollar amount of the net
               proceeds by the Holder upon sale of Registrable
               Securities giving rise to such indemnification
               obligation.

                                   8.3.  Promptly after receipt by an
               indemnified party under this Section 8 of notice of the
               commencement of any action, suit, proceeding,
               investigation or threat thereof made in writing for which
               such indemnified party may make a claim under this
               Section 8, such indemnified party shall deliver to the
               indemnifying party a written notice of the commencement
               thereof and the indemnifying party shall have the right
               to participate in, and, to the extent the indemnifying
               party so desires, jointly with any other indemnifying
               party similarly noticed, to assume the defense thereof
               with counsel mutually satisfactory to the parties;
               subject to the rights of an indemnified party to retain
               its own counsel as hereinafter provided.  The failure to
               deliver written notice to the indemnifying party within a
               reasonable time following the commencement of any such
               action, if materially prejudicial to its ability to
               defend such action, shall relieve such indemnifying party
               of any liability to the indemnified party under this
               Section 8 but shall not relieve the indemnifying party of
               any liability that it may have to any indemnified party
               otherwise than pursuant to this Section 8.  Any fees and
               expenses incurred by the indemnified party (including any
               fees and expenses incurred in connection with
               investigating or preparing to defend such action or
               proceeding) owed by the indemnifying party hereunder
               shall be paid to the indemnified party, as incurred,
               within thirty (30) days of written notice thereof to the
               indemnifying party (subject to refund if it is ultimately
               determined that an indemnified party is not entitled to
               indemnification hereunder).  Any such indemnified party
               shall have the right to employ separate counsel in any
               such action, claim or proceeding and to participate in
               the defense thereof, but the fees and expenses of such
               counsel shall be the expenses of such indemnified party
               unless (i) the indemnifying party has agreed to pay such
               fees and expenses or (ii) the indemnifying party shall
               have failed to promptly assume the defense of such
               action, claim or proceeding or (iii) the named parties to
               any such action, claim or proceeding (including any
               impleaded parties) include both such indemnified party
               and the indemnifying party, and such indemnified party
               shall have been advised by counsel that there may be one
               or more legal defenses available to it which are
               different from or in addition to those available to the
               indemnifying party and that the assertion of such
               defenses would create a conflict of interest such that
               counsel employed by the indemnifying party could not
               faithfully represent the indemnified party (in which
               case, if such indemnified party notifies the indemnifying
               party in writing that it elects to employ separate
               counsel at the expense of the indemnifying party, the
               indemnifying party shall not have the right to assume the
               defense of such action, claim or proceeding on behalf of
               such indemnified party, it being understood, however,
               that the indemnifying party shall not, in connection with
               any one such action, claim or proceeding or separate but
               substantially similar or related actions, claims or
               proceedings in the same jurisdiction arising out of the
               same general allegations or circumstances, be liable for
               the reasonable fees and expenses of more than one
               separate firm of attorneys (together with appropriate
               local counsel) at any time for all such indemnified
               parties, unless in the reasonable judgment of such
               indemnified party a conflict of interest may exist
               between such indemnified party and any other of such
               indemnified parties with respect to such action, claim or
               proceeding, in which event the indemnifying party shall
               be obligated to pay the fees and expenses of such
               additional counsel or counsels).

                                   8.4.  If the indemnification required
               by this Section 8 from the indemnifying party is
               unavailable to an indemnified party hereunder in respect
               of any losses, claims, damages, liabilities or expenses
               referred to in this Section 8:

                                   (i)  The indemnifying party, in lieu
               of indemnifying such indemnified party, shall contribute
               to the amount paid or payable by such indemnified party
               as a result of such losses, claims, damages, liabilities
               or expenses in such proportion as is appropriate to
               reflect the relative fault of the indemnifying party and
               indemnified parties in connection with the actions which
               resulted in such losses, claims, damages, liabilities or
               expenses, as well as any other relevant equitable
               considerations.  The relative fault of such indemnifying
               party and indemnified parties shall be determined by
               reference to, among other things, whether any Violation
               has been committed by, or relates to information supplied
               by, such indemnifying party or indemnified parties, and
               the parties' relative intent, knowledge, access to
               information and opportunity to correct or prevent such
               Violation.  The amount paid or payable by a party as a
               result of the losses, claims, damages, liabilities and
               expenses referred to above shall be deemed to include,
               subject to the limitations set forth in Section 8.1 and
               Section 8.2, any legal or other fees or expenses
               reasonably incurred by such party in connection with any
               investigation or proceeding; provided, however, that in
               no event shall the Holder be required to contribute an
               amount greater than the dollar amount of the net proceeds
               received by the Holder with respect to the sale of any
               securities.

                                   (ii)  The parties hereto agree that
               it would not be just and equitable if contribution
               pursuant to this Section 8.4 were determined by pro rata
               allocation or by any other method of allocation which
               does not take into account the equitable considerations
               referred to in Section 8.4(i).  No Person guilty of
               fraudulent misrepresentation (within the meaning of
               Section 11(f) of the Securities Act) shall be entitled to
               contribution from any Person who was not guilty of such
               fraudulent misrepresentation.

                                   8.5.  If indemnification is available
               under this Section 8 the indemnifying parties shall
               indemnify each indemnified party to the full extent
               provided in this Section 8 without regard to the relative
               fault of such indemnifying party or indemnified party or
               any other equitable consideration referred to in Section
               8.4.

                                   8.6.  The obligations of the Company,
               the Holder and any Permitted Holder Group Transferee
               under this Section 8 shall survive the completion of any
               offering of Registrable Securities pursuant to a
               Registration Statement under this Agreement, and
               otherwise.

                                   Section 9.  Holdback.
                
                                   9.1  If so requested by the
               Underwriters' Representative in connection with an
               offering of any securities covered by a registration
               statement filed by the Company, whether or not securities
               of the Holder or any Permitted Holder Group Transferee
               are included therein, the Holder shall agree not to
               effect or permit any Permitted Holder Group Transferee to
               effect any sale or distribution of shares of Common Stock
               including a sale pursuant to Rule 144 under the
               Securities Act (except as part of such underwritten
               registration) during the 7-day period prior to, and
               during the 90-day period beginning on, the date such
               registration statement is declared effective under the
               Securities Act by the Commission, provided that the
               Holder is timely notified of such effective date in
               writing by the Company or such Underwriters'
               Representative.  In order to enforce the foregoing
               covenant, the Company shall be entitled to impose stop-
               transfer instructions with respect to the Registrable
               Securities of the Holder until the end of such period. 
               The restrictions in this Section 9 are in addition to and
               not in limitation of the restrictions on transfer
               applicable to the Investor Group under the Investment
               Agreement.  The Holder shall not be subject to the
               restrictions set forth in this Section 9.1 for longer
               than 90 days during any 12 month period.

                                   9.2.  If so requested by the
               Underwriters' Representative in connection with an
               offering of any Registrable Securities, the Company shall
               agree not to effect any sale or distribution of shares of
               Common Stock during the 7-day period prior to, and during
               the 90-day period beginning on, the date such
               Registration Statement is declared effective under the
               Securities Act by the Commission (or, in the case of an
               underwriting under the Shelf Registration, the date of
               the closing under the underwriting agreement).  The
               Company agrees to use its commercially reasonable efforts
               to obtain from each holder of restricted securities of
               the Company the same as or similar to those being
               registered by the Company on behalf of the Holder, or any
               restricted securities convertible into or exchangeable or
               exercisable for any of its securities, an agreement not
               to effect any sale or distribution of such securities
               (other than securities purchased in a public offering)
               during any period referred to in this paragraph, except
               as part of any such Registration Statement if permitted. 
               Without limiting the foregoing, if the Company grants any
               Person (other than a holder of Registrable Securities)
               any rights to demand or participate in a Registration,
               the Company agrees that the agreement with respect
               thereto shall include such Person's agreement as
               contemplated by the previous sentence.

                                   Section 10. Amendment, Modification
               and Waivers; Further Assurances.

                                   (i)  This Agreement may be amended
               with the consent of the Company and the Company may take
               any action herein prohibited, or omit to perform any act
               herein required to be performed by it, only if the
               Company shall have obtained the written consent of the
               Holder to such amendment, action or omission to act.

                                   (ii)  No waiver of any terms or
               conditions of this Agreement shall operate as a waiver of
               any other breach of such terms and conditions or any
               other term or condition, nor shall any failure to enforce
               any provision hereof operate as a waiver of such
               provision or of any other provision hereof.  No written
               waiver hereunder, unless it by its own terms explicitly
               provides to the contrary, shall be construed to effect a
               continuing waiver of the provisions being waived and no
               such waiver in any instance shall constitute a waiver in
               any other instance or for any other purpose or impair the
               right of the party against whom such waiver is claimed in
               all other instances or for all other purposes to require
               full compliance with such provision.

                                   (iii)  Each of the parties hereto
               shall exercise all such further instruments and documents
               and take all such further action as any other party
               hereto may reasonably require in order to effectuate the
               terms and purposes of this Agreement. The Company shall
               cause the Standstill Successor to be bound by the terms
               of this Agreement.

                                   Section 11.  Assignment; Benefit. 
               This Agreement and all of its provisions hereof shall be
               binding upon and shall inure to the benefit of the
               parties hereto and their respective successors and
               permitted assigns; provided, however, that neither this
               Agreement nor any of the rights, interests or obligations
               hereunder may be assigned or delegated by the Holder to
               any Person except a wholly owned direct or indirect
               subsidiary of the Holder to whom the Holder shall have
               transferred all of the Registrable Securities then owned
               by the Holder as permitted by, and subject to the terms
               of, the Investment Agreement.

                                   Section 12.  Miscellaneous.

                                   12.1  Governing Law; Submission to
               Jurisdiction.  This Agreement shall be governed by, and
               interpreted in accordance with, the laws of the State of
               Iowa applicable to contracts made and to be performed in
               that state.  The parties hereto irrevocably (a) submit to
               the exclusive personal jurisdiction of any state or
               federal court in the State of Illinois in any suit,
               action or other legal proceeding relating to this
               Agreement; (b) agree that all claims in respect of any
               such suit, action or other legal proceeding may be heard
               and determined in, and enforced in and by, any such
               court; and (c) waive any objection that they may now or
               hereafter have to venue in any such court or that such
               court is an inconvenient forum.

                                   12.2  Notices.  All notices and
               requests given pursuant to this Agreement shall be in
               writing and shall be made by hand- delivery, first-class
               mail (registered or certified, return receipt requested),
               confirmed facsimile or overnight air courier guaranteeing
               next business day delivery to the relevant address
               specified below:

                                  (a)  If to the Company, to:
                              
                                   Pioneer Hi-Bred International, Inc.
                                   700 Capital Square
                                   Des Moines, Iowa  50309
                                   Attention:  General Counsel
                                   Telephone:  515-248-4800
                                   Telecopier:  515-248-4844

                                   With a copy to:
                                   
                                   Fried, Frank, Harris, Shriver & Jacobson
                                   One New York Plaza
                                   New York, New York 10044
                                   Attention:  Stephen Fraidin, Esq.
                                   Telephone:  212-859-8000
                                   Telecopier:  212-859-4000

                               (b) If to the Investor, to:

                                   E.I. du Pont de Nemours and Company
                                   Agricultural Products
                                   Barley Mill Plaza #38
                                   P.O. Box 80038
                                   Wilmington, DE  19880-0038
                                   Attention:  William F. Kirk,
                                               Vice President and
                                                 General Manager
                                   Telephone:  302-774-1000
                                   Telecopier:  302-992-6184
                                   
                                   With a copy to:
                                   
                                   Skadden, Arps, Slate, Meagher
                                     & Flom, LLP
                                   919 Third Avenue
                                   New York, New York 10022
                                   Attention:  Lou R. Kling, Esq.
                                   Telephone:  212-735-3000
                                   Telecopier:  212-735-2000

               Except as otherwise provided in this Agreement, the date
               of each such notice and request shall be deemed to be,
               and the date on which each such notice and request shall
               be deemed given shall be: at the time delivered, if
               personally delivered or mailed; when receipt is
               acknowledged, if sent by facsimile; and the next business
               day after timely delivery to the courier, if sent by
               overnight air courier guaranteeing next business day
               delivery. 

                                   12.3.  Entire Agreement; Integration. 
               This Agreement supersedes all prior agreements between or
               among any of the parties hereto with respect to the
               subject matter contained herein and therein, and such
               agreements embody the entire understanding among the
               parties relating to such subject matter.

                                   12.4.  Injunctive Relief.  Each of
               the parties hereto acknowledges that in the event of a
               breach by any of them of any material provision of this
               Agreement, the aggrieved party may be without an adequate
               remedy at law.  Each of the parties therefore agrees that
               in the event of such a breach hereof the aggrieved party
               may elect to institute and prosecute proceedings in any
               court of competent jurisdiction to enforce specific
               performance or to enjoin the continuing breach hereof. 
               By seeking or obtaining any such relief, the aggrieved
               party shall not be precluded from seeking or obtaining
               any other relief to which it may be entitled.

                                   12.5.  Section Headings.  Section
               headings are for convenience of reference only and shall
               not affect the meaning of any provision of this
               Agreement.

                                   12.6.  Counterparts.  This Agreement
               may be executed in any number of counterparts, each of
               which shall be an original, and all of which shall
               together constitute one and the same instrument.  All
               signatures need not be on the same counterpart.

                                   12.7.  Severability.  If any
               provision of this Agreement shall be invalid or
               unenforceable, such invalidity or unenforceability shall
               not affect the validity and enforceability of the
               remaining provisions of this Agreement, unless the result
               thereof would be unreasonable, in which case the parties
               hereto shall negotiate in good faith as to appropriate
               amendments hereto.

                                   12.8.  Filing.  A copy of this
               Agreement and of all amendments thereto shall be filed at
               the principal executive office of the Company with the
               corporate records of the Company.

                                   12.9.  Termination.  This Agreement
               may be terminated at any time by a written instrument
               signed by the parties hereto. Unless sooner terminated in
               accordance with the preceding sentences, this Agreement
               (other than Section 8 hereof) shall terminate in its
               entirety on such date as the Total Ownership Percentage
               (as defined in the Investment Agreement) of the Holder
               shall be less than 2%, provided that any shares of Common
               Stock previously subject to this Agreement shall not be
               Registrable Securities following the sale of any such
               shares in an offering registered pursuant to this
               Agreement.

                                   12.10.  Attorneys' Fees.  In any
               action or proceeding brought to enforce any provision of
               this Agreement, or where any provision hereof is validly
               asserted as a defense, the successful party shall be
               entitled to recover reasonable attorneys' fees (including
               any fees incurred in any appeal) in addition to its costs
               and expenses and any other available remedy.

                                   12.11.  No Third Party Beneficiaries. 
               Nothing herein expressed or implied is intended to confer
               upon any person, other than the parties hereto or their
               respective permitted assigns, successors, heirs and legal
               representatives, any rights, remedies, obligations or
               liabilities under or by reason of this Agreement;
               provided, however, that any Permitted Holder Group
               Transferee shall be entitled to any rights, remedies,
               obligations or liabilities conferred under or by reason
               of this Agreement.

                                   IN WITNESS WHEREOF, this Agreement
               has been duly executed by the parties hereto as of the
               date first written above.

                                           E.I. DU PONT DE NEMOURS AND
                                              COMPANY
                                           
                                           
                                           By: -----------------------------
                                               Name:
                                               Title:
                                             
                                             
                                           PIONEER HI-BRED INTERNATIONAL, INC.
                                           
                                           
                                           By: -----------------------------
                                               Name:
                                               Title:


                                       EXHIBIT B
                           Form of Rights Agreement Amendment
                                               
                                   AMENDMENT NO. 1, dated as of
               _________ __, 1997, to AMENDED AND RESTATED RIGHTS
               AGREEMENT, dated as of December 13, 1996 (the "Amended
               and Restated Rights Agreement"), between Pioneer Hi-Bred
               International, Inc., an Iowa corporation (the "Company"),
               and Bank Boston N.A. (formally known as The First
               National Bank of Boston), a national banking association
               ("Rights Agent").

                                   On April 6, 1989, the Board of
               Directors of the Company (the "Board") authorized and
               declared a dividend of one common share purchase right (a
               "Right") for each share of Common Stock, par value $1.00
               per share, of the Company ("Common Stock") outstanding at
               the Close of Business (as defined in the Amended and
               Restated Rights Agreement) on April 6, 1989 (the "Record
               Date"), each Right representing the right to purchase one
               (subject to adjustment as provided in the Amended and
               Restated Rights Agreement) share of Common Stock, upon
               the terms and subject to the conditions set forth in the
               Amended and Restated Rights Agreement, and has further
               authorized the issuance of one Right with respect to each
               share of Common Stock that shall become outstanding
               between the Record Date and the Distribution Date (as
               defined in the Amended and Restated Rights Agreement);
               provided, however, that Rights may be issued with respect
               to shares of Common Stock that shall become outstanding
               after the Distribution Date and prior to the earlier of
               the Redemption Date and the Final Expiration Date in
               accordance with the provisions of Section 23 of the
               Amended and Restated Rights Agreement.

                                   On December 13, 1994, the Board
               amended and modified, and on December 13, 1996, the Board
               amended and restated, the terms of the Rights Agreement,
               dated as of April 6, 1989, between the Company and the
               Rights Agent, to, among other things, modify the Rights
               so that each Right represents the right to purchase one
               one-thousandth of a Preferred Share (as defined in the
               Amended and Restated Rights Agreement).  On _________ __,
               1997, the Board authorized the execution and delivery of
               this Amendment No. 1, which amends such Amended and
               Restated Rights Agreement.

                                   Accordingly, in consideration of the
               premises and the mutual agreements herein set forth, the
               parties hereby agree as
               follows:

                                   SECTION 1. AMENDMENTS.  (a)  The
               definition of "Acquiring Person" contained in subsection
               1(a) of the Amended and Restated Rights Agreement is
               hereby amended in its entirety to read as follows:

                                   "(a) "Acquiring Person" shall mean
               any Person who or which, together with all Affiliates and
               Associates of such Person, shall be the Beneficial Owner
               of the Trigger Amount or more of the then outstanding
               Common Shares or was such a Beneficial Owner at any time
               after the date hereof, whether or not such person
               continues to be the Beneficial Owner of the Trigger
               Amount or more of the then outstanding Common Shares.
               Notwithstanding the foregoing, (i) the term "Acquiring
               Person" shall not include (A) the Company, (B) any
               Subsidiary of the Company, (C) any employee benefit plan
               of the Company or of any Subsidiary of the Company, (D)
               any Person or entity organized, appointed or established
               by the Company for or pursuant to the terms of any such
               plan acting in such capacity, (E) any Grandfathered
               Person or (F) the Investor or any Permitted Investor
               Transferee, but only to the extent of Common Shares held
               or acquired by the Investor and any Permitted Investor
               Transferee during the term of the Investment Agreement in
               accordance with the terms of the Investment Agreement
               and, following the termination of the Investment
               Agreement, only to the extent of Common Shares
               Beneficially Owned by the Investor and any Permitted
               Investor Transferee on the date of the termination (the
               "Termination Date") of the Investment Agreement, it being
               understood that (I) if, after the Termination Date, the
               Investor or any Permitted Investor Transferee acquires
               Beneficial Ownership of any Common Shares not owned by
               such person on the Termination Date, the Investor or such
               Permitted Investor Transferee will be deemed an Acquiring
               Person if, after giving effect to such acquisition, such
               person would be an Acquiring Person but for the
               provisions of this clause (F) and (II) if any Permitted
               Investor Transferee ceases to be a wholly-owned (other
               than directors' qualifying shares) United States
               Subsidiary of the Investor, such Permitted Investor
               Transferee will be deemed an Acquiring Person if such
               person would be an Acquiring Person at such time but for
               the provisions of this clause (F); and (ii) no Person
               shall become an "Acquiring Person" (x) as a result of the
               acquisition of Common Shares by the Company which, by
               reducing the number of Common Shares outstanding,
               increases the proportional number of shares beneficially
               owned by such Person together with all Affiliates and
               Associates of such Person, provided, that if (1) a Person
               would become an Acquiring Person (but for the operation
               of this clause (x)) as a result of the acquisition of
               Common Shares by the Company, and (2) after such share
               acquisition by the Company, such Person, or an Affiliate
               or Associate of such Person, becomes the Beneficial Owner
               of any additional Common Shares, then such Person shall
               be deemed an Acquiring Person, or (y) if (1) within five
               Business Days after such Person would otherwise have
               become or, if such Person did so inadvertently, after
               such Person discovers that such Person would otherwise
               have become, an Acquiring Person (but for the operation
               of this clause (y)), such Person notifies the Board that
               such Person did so inadvertently, and (2) within two
               Business Days after such notification (or such greater
               period of time as may be determined by action of the
               Board, but in no event greater than five Business Days),
               such Person divests itself of a sufficient number of
               Common Shares so that such Person is the Beneficial Owner
               of such number of Common Shares that such Person no
               longer would be an Acquiring Person."

                                   (b)  The definition of "Common
               Shares" contained in subsection 1(g) of the Amended and
               Restated Rights Agreement is hereby amended in its
               entirety to read as follows:

                                   "(g) "Common Shares" when used with
               reference to the Company shall mean the shares of Common
               Stock, par value of One Dollar ($1.00) per share, of the
               Company or, in the event of a subdivision, combination or
               consolidation with respect to such shares of Common
               Stock, the shares of Common Stock resulting from such
               subdivision, combination or consolidation; provided that,
               so long as any Series A Convertible Preferred Stock
               remains outstanding, (i) the number of Common Shares
               outstanding at any time shall include all shares of
               Common Stock, par value $1.00 per share, of the Company
               issuable upon conversion of such outstanding Series A
               Convertible Preferred Stock, whether or not then
               convertible, and (ii) for purposes of Sections 3(a), (b)
               (except for the first three sentences) and (c), Section
               12, Section 13, Section 15, Sections 16(a) and (c),
               Section 18, Section 21, Section 22, Section 23 (except
               for the provisions of (a)(i)), Section 26, Section 27 and
               Section 30 hereof, "Common Shares" shall be deemed to
               mean both the shares of Common Stock, par value $1.00 per
               share, then outstanding and shares of Series A
               Convertible Preferred Stock, used in the conjunctive or
               the alternative, as the context may require.  "Common
               Shares" when used with reference to any Person other than
               the Company shall mean the capital stock (or equity
               interest) with the greatest combined economic and voting
               power of such other Person or, if such other Person is a
               Subsidiary of another Person, the Person or Persons which
               ultimately control such first-mentioned Person."

                                   (c)  The definition of "Disinterested
               Directors" contained in subsection 1(h) of the Amended
               and Restated Rights Agreement is hereby deleted in its
               entirety.

                                   (d)  The definition of "Permitted
               Offer" contained in subsection 1(k) of the Amended and
               Restated Rights Agreement is hereby deleted in its
               entirety.

                                   (e) The definition of "Trigger
               Amount" contained in subsection 1(r) of the Amended and
               Restated Rights Agreement is hereby amended in its
               entirety to read as follows:

                         "(r) "Trigger Amount" shall mean the lesser of:

                                   (i) 15% or more of the Common Shares
                                   then outstanding; or
                              
                                   (ii) 10% or more of the Common Shares
                                   then outstanding, but only when and
                                   if such Common Shares represent
                                   one-fourth (1/4) or more of the
                                   combined voting power of the shares
                                   of Common Stock, par value $1.00 per
                                   share, of the Company, and the shares
                                   of Series A Convertible Preferred
                                   Stock then outstanding.  As to any
                                   Beneficial Owner (and its Affiliates
                                   and Associates) with respect to which
                                   the Trigger Amount is being
                                   determined, the voting power will be
                                   determined by the Company in the
                                   ordinary course of corporate
                                   governance relating to the
                                   determination of voting power with
                                   respect to actions submitted to a
                                   vote of stockholders assuming such
                                   holder has taken the necessary
                                   documentation steps to have
                                   effectuated the right to have five
                                   votes per Common Share with no other
                                   estimation or assumption as to
                                   holdings."
                              
                                   (f) Section 1 of the Amended and
               Restated Rights Agreement shall be amended to add the
               following subsections (t) through (x):

                                   "(t) "Investment Agreement" means the
               Investment Agreement, dated as of _____ __, 1997, between
               the Company and the Investor.

                                   (u)   "Investor" shall have the
               meaning set forth in the Investment Agreement.

                                   (v)  "Permitted Investor Transferee"
               shall mean any wholly owned (other than directors'
               qualifying shares) United States Subsidiary of the
               Investor which, at the time of determination continues to
               be a wholly-owned (other than directors' qualifying
               shares) United States Subsidiary of the Investor and,
               owns shares of Series A Convertible Preferred Stock
               acquired from the Holder or from the Company during the
               term of the Investment Agreement and in accordance with
               the terms thereof.

                                   (w)  "Series A Convertible Preferred
               Stock" means the Series A Convertible Preferred Stock of
               the Company, par value $.01 per share and, following any
               reclassification of the Series A Convertible Preferred
               Stock into Class B Common Stock in accordance with
               Section 8.8 of the Investment Agreement, the Class B
               Common Stock (as defined in the Investment Agreement).

                                   (x)  "13D Group" shall mean any group
               of Persons who, with respect to those acquiring, holding,
               voting or disposing of Voting Securities would be
               required under Section 13(d) of the Exchange Act and the
               rules and regulations thereunder to file a statement on
               Schedule 13D with the Securities and Exchange Commission
               as a "person" within the meaning of Section 13(d)(3) of
               the Exchange Act, or who would be considered a "person"
               for purposes of Section 13(g)(3) of the Exchange Act."

                                   (g)  Section 13(d) of the Amended and
               Restated Rights Agreement is hereby deleted in its
               entirety.

                                   (h)  The penultimate sentence of
               Section 3(a) of the Amended and Restated Rights Agreement
               is hereby amended in its entirety to read as follows: 
               "As soon as practicable after the Distribution Date, the
               Company will prepare and execute, the Rights Agent will
               countersign and send, or cause to be sent, by
               first-class, insured, postage prepaid mail, to each
               record holder of Common Shares and Series A Convertible
               Preferred Stock as of the Close of Business on the
               Distribution Date, at the address of such holder shown on
               the records of the Company, a Right Certificate,
               substantially in the form of Exhibit B hereto (a "Right
               Certificate"), evidencing, in the case of holders of
               Common Shares, one Right for each Common Share so held,
               and, in the case of holders of Series A Convertible
               Preferred Stock, one Right for each share of Common
               Stock, par value $1.00 per share, into which such Series
               A Convertible Preferred Stock is convertible (whether or
               not then convertible)."

                                   (i)  The third sentence of Section
               7(b) of the Amended and Restated Rights Agreement is
               hereby amended in its entirety to read as follows: 
               "Anything in this Agreement to the contrary
               notwithstanding, in the event that at any time after the
               date hereof and prior to the Distribution Date, the
               Company shall (i) declare or pay any dividend on the
               Common Shares payable in Common Shares or (ii) effect a
               subdivision, combination or consolidation of the Common
               Shares (by reclassification or otherwise than by payment
               of dividends in Common Shares) into a greater or lesser
               number of Common Shares, then in any such case, each
               Common Share outstanding following such subdivision,
               combination or consolidation shall continue to have one
               Right (or, in the case of Series A Convertible Preferred
               Stock, one Right for each share of Common Stock, par
               value $1.00 per share, into which such Series A
               Convertible Preferred Stock is convertible (whether or
               not then convertible) following such subdivision,
               combination or consolidation) (subject to adjustment as
               provided here) associated therewith and the Purchase
               Price following any such event shall be proportionately
               adjusted to equal the result obtained by multiplying the
               Purchase Price immediately prior to such event by a
               fraction the numerator of which shall be the total number
               of Common Shares outstanding immediately prior to the
               occurrence of the event and the denominator of which
               shall be the total number of Common Shares outstanding
               immediately following the occurrence of such event."

                                   SECTION 2. EFFECT OF AMENDMENT. 
               Except as modified by this Amendment No. 1, the Amended
               and Restated Rights Agreement shall remain in full force
               and effect.

                                   SECTION 3. SEVERABILITY.  If any
               term, provision, covenant or restriction of this
               Amendment No. 1 is held by a court of competent
               jurisdiction or other authority to be invalid, void or
               unenforceable, the remainder of the terms, provisions,
               covenants and restrictions of this Agreement shall remain
               in full force and effect and shall in no way be affected,
               impaired or invalidated.

                                   SECTION 4. GOVERNING LAW.  This
               Amendment No. 1 shall be deemed to be a contract made
               under the laws of the State of Iowa and for all purposes
               shall be governed by and construed in accordance with the
               laws of such State applicable to contracts made and to be
               performed entirely within such State.

                                   SECTION 5. COUNTERPARTS.  This
               Amendment No. 1 may be executed in any number of
               counterparts and each of such counterparts shall for all
               purposes be deemed to be an original, and all such
               counterparts shall together constitute but one and the
               same instrument.

                                   IN WITNESS WHEREOF, the parties
               hereto have caused this Agreement to be duly executed and
               attested, all as of the date and year first above
               written.

                                       PIONEER HI-BRED INTERNATIONAL, INC.
                                             
                                       By:  /s/ Charles S. Johnson
                                            -------------------------------
                                       Name:  Charles S. Johnson
                                       Title:  President and CEO
                                             
                                       By:  /s/ Jerry Chicoine
                                            -------------------------------
                                       Name:  Jerry Chicoine
                                       Title: Vice President and Chief
                                       Financial Officer
                                             
                                       BANK BOSTON N.A.
                                       the Rights Agent
                                             
                                       By:
                                       Name:  Kathryn Anderson
                                       Title:  Administrative Manager
                                             
                                             
                   


                                       EXHIBIT C
                           Form of Certificate of Designation
                                               
                                               
                                               
                                               
                                               
                                                                         
                  
                                               
                                               
                                               
                        CERTIFICATE OF THE DESIGNATIONS, POWERS,
                        PREFERENCES AND RELATIVE, PARTICIPATING,
                   OPTIONAL OR OTHER RIGHTS, AND THE QUALIFICATIONS,
                        LIMITATIONS OR RESTRICTIONS THEREOF, OF
                                               
                          SERIES A CONVERTIBLE PREFERRED STOCK

                                               

                                           OF

                                               

                          PIONEER HI-BRED INTERNATIONAL, INC.

                                               

                    Pioneer Hi-Bred International, Inc., an Iowa
               corporation (the "Corporation"), does hereby certify that
               the Board of Directors of the Corporation duly adopted
               the following resolution, at a meeting duly convened and
               held on August 5, 1997, in respect of a series of
               Preferred Stock of the Corporation, pursuant to authority
               conferred upon the Board by Article IV of the Articles of
               Incorporation of the Corporation and in accordance with
               Section ____ of the Business Corporation Act of the State
               of Iowa:
                    
                    BE IT RESOLVED, that the issuance of a series of
               Preferred Stock of the Corporation is hereby authorized,
               and the designation, amount, powers, preferences and
               relative, participating, optional and other special
               rights and qualifications, limitations and restrictions
               thereof, of the shares of such series of Preferred Stock
               of the Corporation, are hereby fixed as follows:
                    
                    1.   DESIGNATION; CLASS AND AMOUNT; CERTAIN
               DEFINITIONS. The series of Preferred Stock, the issuance
               of which is hereby authorized, shall comprise 200,000
               shares the distinctive serial designation of which shall
               be "Preferred Stock, Series A", which is sometimes herein
               referred to as "Series A Convertible Preferred Stock". 
               Each share of Series A Convertible Preferred Stock shall
               be identical in all respects with all other shares of
               Series A Convertible Preferred Stock.  The number of
               shares of Series A Convertible Preferred Stock which are
               purchased or otherwise acquired by the Corporation or
               converted into Common Stock shall be canceled and shall
               revert to authorized but unissued shares of Series A
               Convertible Preferred Stock undesignated as to series. 
               The Corporation shall not issue, sell or otherwise
               transfer shares of Series A Convertible Preferred Stock
               to any Person other than the members of the Investor
               Group. Certain capitalized terms used herein have the
               meanings specified therefor in Section 10 below.
                    
                    2.   DIVIDENDS. (a) Except as set forth in the
               Investment Agreement, each Holder of shares of Series A
               Convertible Preferred Stock shall participate with the
               holders of Common Stock in all Dividends, when, as and if
               declared by the Board and paid or distributed by the
               Corporation on or in respect of the Common Stock on a
               share for share basis and in like tenor and forms as the
               Dividend paid on the Common Stock as if all shares of
               Series A Convertible Preferred Stock were converted into
               the number of shares of Common Stock (whether or not the
               Series A Convertible Preferred Stock is then so
               convertible) calculated in accordance with Section 6
               below, immediately prior to the record date for such
               Dividend.  Except as set forth above, holders of shares
               of Series A Convertible Preferred Stock shall not be
               entitled to receive any dividends.  Except to the extent
               payable in respect of dividends paid on the Common Stock,
               no interest, or sum of money in lieu of interest, shall
               be payable in respect of any dividend payment or payments
               on shares of Series A Convertible Preferred Stock.
                    
                    (b)  Dividends on the Series A Convertible Preferred
               Stock in respect of each Dividend shall be payable, when
               and if declared by the Board of Directors, concurrently
               with each date of payment (each such date, a "Dividend
               Payment Date") by the Corporation of Dividends on the
               Common Stock.  Dividends payable in cash shall be paid by
               wire transfer in immediately available funds to the
               accounts designated by the respective Holders in written
               notices given to the Corporation at least two Business
               Days prior to the payment date or by such other means as
               may be agreed to by the Corporation and the respective
               Holders.
                    
                    (c)  The Corporation will cause written notice of
               each Dividend on the Series A Convertible Preferred Stock
               to be given to each Holder within five Business Days
               after it is determined by the Board of Directors.
                    
                    3.   VOTING RIGHTS. (a)  Except as otherwise
               provided herein or as required by law, the Holders of
               Series A Convertible Preferred Stock shall not be
               entitled to any Vote.
                    
                    (b)  At any meeting called for the purpose of voting
               on (or acting by written consent with respect to) any
               matter to be voted upon by the holders of Common Stock of
               the Corporation, the holders of shares of Series A
               Convertible Preferred Stock and the holders of shares of
               Common Stock shall vote together as one class on all
               matters so submitted to a vote of stockholders of the
               Corporation.  At any such meeting or in connection with
               any such action by written consent, each share of Series
               A Convertible Preferred Stock shall carry, as of the
               record date applicable to such vote, a number of votes
               equal to the Per Share Vote Amount as calculated by the
               Corporation for such meeting.      

                    (c)  In accordance with Section 6.2(b) of the
               Investment Agreement, the Corporation will cause written
               notice of any vote as to which holders of Common Stock
               are entitled to vote as a separate class or voting group
               under the Articles of Incorporation or Iowa Law (a "Class
               Vote"), to be given to each Holder at least 15 Business
               Days prior to such Class Vote.
                    
                    4.   LIQUIDATION PREFERENCE.  In the event of any
               voluntary or involuntary liquidation, dissolution or
               winding up of the affairs of the Corporation, the Holders
               of shares of Series A Convertible Preferred Stock then
               outstanding shall be entitled, for each share of Series A
               Convertible Preferred Stock, to be paid out of the assets
               of the Corporation available for distribution to its
               stockholders the amount of cash or other property that
               would be payable on the number of shares of Common Stock
               then issuable upon conversion of such share of Series A
               Convertible Preferred Stock (whether or not then
               convertible) (such amount payable being adjusted
               appropriately to reflect any stock split, stock dividend,
               reverse stock split, or any transaction with comparable
               effect upon the Common Stock) (the "Liquidation
               Preference").  This entitlement of the Holders of shares
               of Series A Convertible Preferred Stock, to the extent
               equal to $.01 for each share of Series A Convertible
               Preferred Stock, shall be satisfied before any similar
               payment shall be made or any assets distributed to the
               holders of the Common Stock or any other security junior
               in rank to the Series A Convertible Preferred Stock as to
               distribution of assets upon such dissolution, liquidation
               or winding up and otherwise shall be satisfied on a pari
               passu basis with the holders of the Common Stock.  If the
               assets of the Corporation are not sufficient to pay in
               full the liquidation payments payable to all of the
               Holders of the outstanding shares of Series A Convertible
               Preferred Stock, then the Holders of all such shares
               shall share ratably in such distribution of assets in
               accordance with the liquidation preference to which they
               are entitled.  For the purposes of this section, neither
               the voluntary sale, conveyance, exchange or transfer (for
               cash, shares of stock, securities or other consideration)
               of all or substantially all of the property or assets of
               the Corporation nor the consolidation or merger of the
               Corporation with one or more other corporations shall be
               deemed to be a liquidation, dissolution or winding up,
               voluntary or involuntary, unless such voluntary sale,
               conveyance, exchange or transfer shall be in connection
               with a dissolution or winding up of the business of the
               Corporation.
                    
                    5.   RESTRICTIONS ON TRANSFER.  The shares of Series
               A Convertible Preferred Stock are subject to the
               provisions of the Investment Agreement (including the
               provisions thereof restricting transfer of such stock).
                    
                    6.   CONVERSION. (a)(i) Concurrently with the
               transfer of Beneficial Ownership of any share of Series A
               Convertible Preferred Stock to any Person other than the
               Investor or another member of the Investor Group or Other
               Investor Affiliate, such share of Series A Convertible
               Preferred Stock shall convert into [100] [FN]Number of
               shares of Common Stock each share is convertible into is
               subject to adjustment prior to Closing in the event of a
               stock split, stock combination or similar adjustment in
               the number of shares of Common Stock outstanding./[FN]
               fully-paid and non-assessable shares of Common Stock (as
               adjusted pursuant to Section 6(c)), in accordance with
               the procedures provided in clause (b) of this Section 6.
                    
                         (ii) At any time (x) at the direction of the
               Corporation, but only if the Corporation intends to
               recommend approval of a Voting Amendment (as defined in
               the Investment Agreement), and (y) at the direction of
               the Investor, following the approval and effectiveness of
               a Voting Amendment, shares of Series A Convertible
               Preferred Stock shall be mandatorily convertible into
               fully-paid and non-assessable shares of Common Stock,
               with each share of Series A Convertible Preferred Stock
               being converted into [100] [FN]Number of shares of Common
               Stock each share is convertible into is subject to
               adjustment prior to Closing in the event of a stock
               split, stock combination or similar adjustment in the
               number of shares of Common Stock outstanding./[FN] shares
               of Common Stock (as adjusted pursuant to Section 6(c)).
                    
                         (iii) The Investor shall have the right, in
               accordance with Section 8.8 of the Investment Agreement,
               at any time that the Investor may exercise the Optional
               Conversion Right (as defined in the Investment Agreement)
               in accordance with the Investment Agreement, to cause all
               shares of Series A Convertible Preferred Stock to be
               converted into fully-paid and non- assessable shares of
               Common Stock, with each share of Series A Convertible
               Preferred Stock being converted into [100] Number of
               shares of Common Stock each share is convertible into is
               subject to adjustment prior to Closing in the event of a
               stock split, stock combination or similar adjustment in
               the number of shares of Common Stock outstanding./[FN]
               shares of Common Stock (as adjusted pursuant to Section
               6(c)).
                    
                         (iv) At any time that all outstanding shares of
               Common Stock (or whatever security received upon
               conversion or exchange thereof) have the same vote per
               share, if any, without any time phase voting, all shares
               of Series A Convertible Preferred Stock shall be
               convertible into fully-paid and non-assessable shares of
               Common Stock, with each such share of Series A
               Convertible Preferred Stock being converted into [100]
               [FN]Number of shares of Common Stock each share is
               convertible into is subject to adjustment prior to
               Closing in the event of a stock split, stock combination
               or similar adjustment in the number of shares of Common
               Stock outstanding shares of Common Stock (as adjusted
               pursuant to Section 6(c)).

                         (v)  Except as set forth in this Section 6(a),
               the shares of Series A Convertible Preferred Stock are
               not convertible at the option of the Holder thereof.
                    
               (b)  (i)  Any Holder of shares of Series A Convertible
               Preferred Stock required (or in the case of clauses (iii)
               or (iv) above requesting) to convert any or all such
               shares into Common Stock shall surrender the
               certificate(s) evidencing such shares of Series A
               Convertible Preferred Stock of the Holder at the office
               of the transfer agent appointed for the purpose of such
               conversion by the Corporation.  Such surrendered
               certificate(s), if the Corporation shall so require,
               shall be duly endorsed to the Corporation or in blank, or
               accompanied by proper instruments of transfer to the
               Corporation or in blank.
                    
                         (ii) The Corporation shall, within one Business
               Day after such surrender of certificates evidencing
               shares of Series A Convertible Preferred Stock
               accompanied by written notice and in compliance with any
               other conditions contained herein, issue and deliver, or
               cause to be issued and delivered, to the Person(s) for
               whose account such certificate(s) evidencing shares of
               Series A Convertible Preferred Stock were so surrendered,
               or to the nominee(s) of such Person(s), certificates
               representing the number of full shares of Common Stock to
               which such Person shall be entitled pursuant to the
               then-applicable conversion rate.  Such conversion shall
               be deemed to have been made on the date of such surrender
               of the certificate(s) evidencing shares of Series A
               Convertible Preferred Stock to be converted (the
               "Surrender Date") and the Person(s) entitled to receive
               the Common Stock deliverable upon conversion of such
               Series A Convertible Preferred Stock shall be treated for
               all purposes as the record holder(s) of such Common Stock
               on such date and thereafter.  Conversion of Series A
               Convertible Preferred Stock may otherwise be achieved in
               accordance with such procedures as the Corporation and a
               majority of the Holders may agree.

                         (iii)     In the event that fewer than all
               shares of Series A Convertible Preferred Stock
               represented by a surrendered certificate are to be
               converted hereunder, a new certificate shall be issued at
               the Corporation's expense representing the shares of
               Series A Convertible Preferred Stock not so converted.

                         (iv) In connection with the conversion of any
               shares of Series A Convertible Preferred Stock, no
               fractions of shares of Common Stock shall be issued, but
               in lieu thereof the Corporation shall pay a cash
               adjustment in respect of such fractional interest in an
               amount equal to such fractional interest multiplied by
               the Market Price (as defined in the Investment Agreement)
               per share of Common Stock on the day on which such shares
               of Series A Convertible Preferred Stock are deemed to
               have been converted.

                         (c)  The conversion rate shall be adjusted from
               time to time as follows:

                         (i)  In case the Corporation shall, at any time
               or from time to time while any of the shares of Series A
               Convertible Preferred Stock are outstanding, (A)
               subdivide or reclassify its outstanding shares of Common
               Stock into a larger number of shares, or (B) combine or
               reclassify its outstanding shares of Common Stock into a
               smaller number of shares, the conversion rate in effect
               immediately prior to such action shall be adjusted so
               that the Holder of any shares of Series A Convertible
               Preferred Stock thereafter surrendered for conversion
               shall be entitled to receive the number of shares of
               Common Stock which such Holder would have owned or have
               been entitled to receive immediately following such
               action had such shares of Series A Convertible Preferred
               Stock been converted immediately prior thereto.  An
               adjustment made pursuant to this Section 6(c)(i) shall
               become effective immediately after the close of business
               on the effective date of a subdivision, reclassification
               or combination. If, as a result of an adjustment made
               pursuant to this Section 6(c)(i), the Holder of any
               shares of Series A Convertible Preferred Stock thereafter
               surrendered for conversion shall become entitled to
               receive shares of two or more classes of capital stock of
               the Corporation, the Board of Directors shall make an
               appropriate allocation of the adjusted conversion rate
               between or among shares of such classes of capital stock
               in accordance with the entitlements of the Common Stock
               underlying the Series A Convertible Preferred Stock in
               connection with such adjustment.
                    
                         (ii) Whenever an adjustment in the conversion
               rate is required, the Corporation shall forthwith place
               on file with its Transfer Agent a statement signed by its
               Chief Executive Officer, Chief Financial Officer or a
               Vice President and by its Secretary, Assistant Secretary,
               Treasurer or Assistant Treasurer, stating the adjusted
               conversion rate determined as provided herein.  Such
               statements shall set forth in reasonable detail such
               facts as shall be necessary to show the reason and the
               manner of computing such adjustment.
                    
                         (d)  (i)  The Corporation shall at all times
               reserve and keep available, free from preemptive rights,
               out of its authorized and unissued stock, such number of
               shares of its Common Stock as shall from time to time be
               sufficient to effect the conversion of all shares of
               Series A Convertible Preferred Stock from time to time
               outstanding, solely for the purpose of effecting such
               conversion.  The Corporation shall, from time to time, in
               accordance with the laws of the State of Iowa, increase
               the authorized number of shares of Common Stock if at any
               time the number of shares of authorized and unissued
               Common Stock shall not be sufficient to permit the
               conversion of all the then outstanding shares of Series A
               Convertible Preferred Stock.
                    
                         (ii) The Corporation will pay any and all stamp
               and transfer taxes that may be payable in respect of the
               issuance or delivery of shares of Common Stock upon
               conversion of shares of Series A Convertible Preferred
               Stock pursuant hereto.  The Corporation shall not,
               however, be required to pay any tax which may be payable
               in respect of any transfer involved in the issuance and
               delivery of shares of Common Stock in a name other than
               that in which the shares of Series A Convertible
               Preferred Stock so converted were registered and no such
               issuance or delivery shall be made unless and until the
               person requesting such issuance has paid to the
               Corporation the amount of any such tax or has established
               to the satisfaction of the Corporation that such tax has
               been paid.
                    
                    (e)  In case of (i) any reclassification or change
               of outstanding shares of Common Stock (other than a
               change in par value or from par value to no par value or
               from no par value to par value, or as a result of a
               subdivision or combination) or (ii) any consolidation or
               merger of the Corporation with one or more other
               corporations (other than a consolidation or merger in
               which the Corporation is the continuing corporation and
               which does not result in any reclassification or change
               of outstanding shares of Common Stock issuable upon
               conversion of Series A Convertible Preferred Stock) or
               (iii) any sale or conveyance to another corporation or
               other entity of all or substantially all of the property
               of the Corporation, then the Corporation, or such
               successor corporation or other entity, as the case may
               be, shall make appropriate provision so that the holder
               of each share of Series A Convertible Preferred Stock
               then outstanding shall have the right to convert such
               share into the kind and amount of shares of stock or
               other securities and property receivable upon such
               consolidation, merger, sale, reclassification, change or
               conveyance by a holder of the number of shares of Common
               Stock into which such shares of Series A Convertible
               Preferred Stock might have been converted immediately
               prior to such consolidation, merger, sale,
               reclassification, change or conveyance, subject to
               adjustment which shall be as nearly equivalent as may be
               practicable to the adjustments provided for in Section
               6(c).  If the holders of Common Stock are entitled to
               elect the consideration payable pursuant any
               consolidation, merger, sale, conveyance or other
               transaction or event set forth above, the Holders also
               shall be entitled to elect between such forms of
               consideration.  The provisions of this paragraph shall
               apply similarly to successive consolidations, mergers,
               sales, conveyances or other transactions or events.
                    
                    (f)  Whenever the number of shares of Common Stock
               into which each share of Series A Convertible Preferred
               Stock is convertible is adjusted as provided in this
               Section 6, the Corporation shall promptly mail to the
               Holders a notice in accordance with Section 8 below
               stating that the number of shares of Common Stock into
               which the shares of Series A Convertible Preferred Stock
               are convertible has been adjusted and setting forth the
               new number of shares of Common Stock (or describing the
               new stock, securities, cash or other property) into which
               each share of Series A Convertible Preferred Stock is
               convertible, as a result of such adjustment, a brief
               statement of the facts requiring such adjustment and the
               computation thereof, and when such adjustment became
               effective.
                    
                    7.   LIMITED PRIORITY.  The Series A Convertible
               Preferred Stock shall, to the extent of the Liquidation
               Preference set forth in Section 4, be senior in rank as
               to distribution of assets upon any liquidation,
               dissolution or winding up of the affairs of the
               Corporation, to the Common Stock, or any class of equity
               securities of the Corporation which by its terms are
               junior to the Series A Convertible Preferred Stock,
               unless the Holders of 66 2/3 percent of the outstanding
               shares of the Series A Convertible Preferred Stock shall
               otherwise consent.
                    
                    8.   NOTICES.  The Corporation shall provide notice
               to each Holder of any action taken or proposed to be
               taken or any determination made by the Corporation and/or
               the Holder under the terms of this Certificate of
               Designations.  Notice of any such action or determination
               by the Corporation and/or the Holder and all other
               notices and other communications provided for in this
               Certificate of Designations shall be delivered by
               facsimile and by reputable overnight courier,

                    (a)  If to the Company, to:
                              
                    Pioneer Hi-Bred International, Inc,
                    700 Capital Square
                    Des Moines, Iowa  50309
                    Attention:  General Counsel
                    Telephone:  515-248-4800
                    Telecopier:  515-248-4844
                    
                    with a copy to:
                    
                    Fried, Frank, Harris, Shriver & Jacobson
                    One New York Plaza
                    New York, New York 10004
                    Facsimile:  (212) 859-4000
                    Attn.:  Stephen Fraidin
                    
                    or such other address as the Corporation shall have
               furnished to the Holders in writing,
                    
                    (b)  if to a Holder, to the address and facsimile
               number of such Holder listed on the Stock Books of the
               Corporation.
                    
                    9.  DEFINITIONS.  Certain capitalized terms are used
               herein as defined below:
                    
                    "AFFILIATE" of a Person has the meaning set forth in
               Rule 2b-2 under the Exchange Act.
                    
                    "ARTICLES OF INCORPORATION" means the Third Restated
               and Amended Articles of Incorporation of the Corporation,
               as amended from time to time.
                    
                    "BENEFICIALLY OWNED" with respect to any securities
               means having "beneficial ownership" of such securities
               (as determined pursuant to Rule 13d-3 under the Exchange
               Act, as in effect on the date hereof, without limitation
               by the 60-day provision in paragraph (d)(1)(i) thereof). 
               The terms "Beneficial Ownership" and "Beneficial Owner"
               have correlative meanings.
                    
                    "BOARD" means the Board of Directors of the
               Corporation.
                    
                    "BUSINESS DAY" means any day other than a Saturday,
               Sunday, or a day on which banking institutions in the
               State of Iowa are authorized or obligated by law or
               executive order to close.
                    
                    "CERTIFICATE OF DESIGNATIONS" means this Certificate
               of Designations, Powers, Preferences and Relative,
               Participating, Optional or other Rights, and the
               Qualifications, Limitations or Restrictions Thereof,
               creating the Series A Convertible Preferred Stock.
                    
                    "COMMON STOCK" means the Common Stock, par value
               $1.00 per share, of the Corporation.
                    
                    "COMMON VOTING POWER" means, in respect of any
               record date for any meeting of stockholders (or action by
               written consent in lieu of a meeting) the aggregate Votes
               represented by all then outstanding Voting Securities
               other than the Series A Convertible Preferred Stock as
               determined by the Board in accordance with the procedures
               set forth in the Articles of Incorporation based on the
               actual Votes entitled to be voted at such meeting
               (excluding any estimation of any kind, including as to
               who would have been entitled to 5 Votes per share if such
               shareholders had taken the requisite steps to obtain such
               Vote).
                    
                    "DIVIDEND" means any dividend or distribution on or
               in respect of the Common Stock of the Corporation,
               whether in cash, additional shares of Common Stock or
               other property.
                    
                    "EXCHANGE ACT" means the Securities Exchange Act of
               1934, as amended, and the regulations promulgated
               thereunder.
                    
                    "HOLDER" means a holder of record of a share or
               shares of Series A Convertible Preferred Stock.
                    
                    "INVESTMENT AGREEMENT" means the Agreement, dated as
               of August 6, 1997, between the Investor and the
               Corporation, as amended and/or restated from time to
               time.
                    
                    "INVESTOR" means E.I. du Pont de Nemours and
               Company.
                    
                    "INVESTOR GROUP" shall have the meaning set forth in
               the Investment Agreement.
                    
                    "INVESTOR GROUP TOTAL OWNERSHIP PERCENTAGE" means,
               with respect to the Investor Group calculated at a
               particular point in time, the ratio, expressed as a
               percentage, of (a) the total number of shares of Common
               Stock Beneficially Owned by the Investor Group and
               issuable upon conversion of (whether or not then
               convertible), or otherwise constituting the economic
               equivalent of, all Common Securities (as defined in the
               Investment Agreement) Beneficially Owned by the Investor
               Group, over (b) the total number of shares of Common
               Stock then outstanding and the number of shares of Common
               Stock issuable upon conversion (whether or not then
               convertible) of, or otherwise constituting the economic
               equivalent of, all outstanding Common Securities;
               PROVIDED that in no event shall the Investor Group Total
               Ownership Percentage of all Holders of Series A
               Convertible Preferred Stock be greater than 20%.
                    
                    "IOWA LAW" shall mean the Business Corporation Act
               of the State of Iowa.
                    
                    "LIQUIDATION PREFERENCE" has the meaning specified
               in Section 4 above.
                    
                    "OTHER INVESTOR AFFILIATE" shall have the meaning
               set forth in the Investment Agreement.
                    
                    "PER SHARE VOTE AMOUNT" means in respect of any
               record date for any meeting of stockholders (or action by
               written consent in lieu of a meeting) that number of
               Votes per share of Series A Convertible Preferred Stock
               equal to (x) the Total Preferred Vote Amount as of such
               record date amount divided by (y) the number of shares of
               Series A Convertible Preferred Stock outstanding as of
               such record date.
                    
                    "PERSON" means any individual, corporation, company,
               association, partnership, joint venture, limited
               liability company, trust or unincorporated organization,
               group (within the meaning of Rule 13d-5 under the
               Exchange Act) or a government or any agency or political
               subdivision thereof.
                    
                    "SERIES A CONVERTIBLE PREFERRED STOCK" has the
               meaning specified in Section 1 above.
                    
                    "STOCK BOOKS" means the stock transfer books of the
               Corporation relating to its Common Stock and Preferred
               Stock.
                    
                    "SUBSIDIARY" means, as to any Person, any other
               Person more than fifty percent (50%) of the shares of the
               voting stock or other voting interests of which are owned
               or controlled, or the ability to select or elect more
               than fifty percent (50%) of the directors or similar
               managers is held, directly or indirectly, by such first
               Person or one or more of its Subsidiaries or by such
               first Person and one or more of its Subsidiaries.  A
               Subsidiary that is directly or indirectly wholly-owned by
               another Person except for directors' qualifying shares
               shall be deemed wholly- owned for purposes of this
               Agreement.
                    
                    "SURRENDER DATE" has the meaning specified in
               Section 6 above.
                    
                    "13D GROUP" shall mean any group of Persons who,
               with respect to those acquiring, holding, voting or
               disposing of Voting Securities would, assuming ownership
               of the requisite percentage thereof, be required under
               Section 13(d) of the Exchange Act and the rules and
               regulations thereunder to file a statement on Schedule
               13D with the Securities and Exchange Commission as a
               "person" within the meaning of Section 13(d)(3) of the
               Exchange Act, or who would be considered a "person" for
               purposes of Section 13(g)(3) of the Exchange Act.
                    
                    "TOTAL PREFERRED VOTE AMOUNT" means, in respect of
               the record date for any meeting (or action by written
               consent in lieu of a meeting) of shareholders of the
               Corporation to vote on any matter, an aggregate number of
               Votes equal to (a) the Common Voting Power as of such
               record date multiplied by (b) a fraction, the numerator
               of which is the Investor Group Total Ownership Percentage
               (expressed as a fraction carried to two decimal places)
               as of such record date and the denominator of which is
               1.00 minus the Investor Group Total Ownership Percentage
               (expressed as a fraction carried to two decimal places)
               as of such record date; provided that in no event shall
               the Total Preferred Vote Amount be greater than 20% of
               Total Voting Power.
                    
                    "TOTAL VOTING POWER" means in respect of any record
               date for any meeting of stockholders (or action by
               written consent in lieu of a meeting) the aggregate Votes
               represented by all then outstanding Voting Securities as
               determined by the Board in accordance with the procedures
               set forth in the Articles of Incorporation based on the
               actual Votes entitled to be voted at such meeting
               (excluding any estimation of any kind, including as to
               who would have been entitled to 5 Votes per share if such
               shareholders had taken the requisite steps to obtain such
               Vote).  
                   
                    "VOTES" shall mean, at any time, with respect to any
               Voting Securities, the total number of votes that would
               be entitled to be cast by the holders of such Voting
               Securities generally (by the terms of such Voting
               Securities, the Articles of Incorporation or any
               certificate of designations for such Voting Securities)
               in a meeting for the election of directors held at such
               time, including the votes that would be able to be cast
               by holders of shares of Series A Convertible Preferred
               Stock in accordance with the procedures set forth in the
               Articles of Incorporation based on the actual number of
               Votes entitled to be voted at such meeting (excluding any
               estimation of any kind, including as to who would have
               been entitled to 5 Votes per share if such shareholders
               had taken the requisite steps to obtain such Vote).
                    
                    "VOTING SECURITIES" means the shares of Common
               Stock, the Series A Convertible Preferred Stock and any
               other securities of the Corporation entitled to vote
               generally for the election of directors, and any
               securities (other than employee stock options) which are
               convertible into, or exercisable or exchangeable for,
               Voting Securities.
                    
                    IN WITNESS WHEREOF, Pioneer Hi-Bred International,
               Inc., has caused this Certificate to be made under the
               seal of the Corporation and signed and attested by the
               undersigned officers of the Corporation this ____ day of
               ___________, 1997.
                    
                                           PIONEER HI-BRED INTERNATIONAL, INC.
                    
                                           By
                                              --------------------------------
                                              Name:
                                              Title:
                    
                    (Corporate Seal)
                    
                    Attest:
                    
                    By
                      ---------------------------
                      Name:
                      Title:
                 


                                                                      
                                                                  EXHIBIT D
                                                                            
                  
                                   INITIAL INVESTOR NOMINEE
                               NOTICE PURSUANT TO SECTION 5.1(B)
                                               
                                               
               1.  Name of Investor                  Charles O. (Chad) 
                   Nominee                             Holliday, Jr.
                                                         
                   14A Information:                        
                                                         
                                          Age          49 (DOB 3/9/48)
                                        Current   Since 1995, Executive Vice
                                       Position   President, DuPont,
                                                  Chairman, DuPont Asia
                                                  Pacific and member of the
                                                  Office of the Chief
                                                  Executive. DuPont is a
                                                  global chemical, energy
                                                  and life sciences
                                                  company.
                                                         
                                     Previous     Senior Vice President,
                                     Positions:   DuPont (1992) President,
                                     (Past 5 +    DuPont Asia Pacific (1990)
                                     years)
                                                         
                                     Other        Analog Devices, Inc.
                                     Director-    DuPont Photmasks, Inc.
                                     ships:       E.I. du Pont deNemours and
                                                    Company

               2.  Name of Investor                  William F. (Bill) Kirk
                    Nominee
                                                         
                   14A Information:                        
                                                         
                                     Age:            54 (DOB 9/11/42)  

                                     Current      Since 1990, Vice President,
                                     Position     General Manager, DuPont
                                                  Agricultural Products.
                                                  Dupont is a global chemical
                                                  energy and life sciences
                                                  company.
                                                         
                                     Previous     General Manager,
                                     Positions:   Agricultural
                                     (Past 5+     Products (1985)
                                     years)                    

                                     Other             None
                                     Director-
                                     ships:



  



          E.I. du Pont de Nemours            DuPont Chemical and
            and Company                        Operations, Inc.
          Agricultural Products              1007 Market Street
          Barley Mill Plaza #38              Suite 8045
          P.O. Box 80038                     Wilmington, DE 19898
          Wilmington, DE 19880-0038          Telephone: (302) 773-3407
          Telephone: (302) 774-1000          Telecopier: (302) 773-1536
          Telecopier: (302) 992-6184


                                        As of September 18, 1997

          Pioneer Hi-Bred International, Inc.
          700 Capital Square
          Des Moines, Iowa 50309
          Attention: General Counsel

          Gentlemen:

               Reference is hereby made to the Investment Agreement
          (the "Investment Agreement"), dated as of August 6, 1997,
          by and between E.I. du Pont de Nemours and Company (the
          "Investor") and Pioneer Hi-Bred International, Inc. 
          Unless otherwise indicated, capitalized terms used herein
          are as defined in the Investment Agreement.  Pursuant to
          Section 2.2(b) of the Investment Agreement, the Investor
          hereby designates DuPont Chemical and Energy Operations,
          Inc. ("DCEO"), a corporation organized under the laws of
          Delaware and a wholly-owned Subsidiary of the Investor,
          to receive the certificates representing the Shares
          issuable to the Investor pursuant to the Investment
          Agreement.  DCEO hereby agrees to be bound by the
          Investment Agreement to the same extent as the Investor. 
          Notwithstanding the foregoing, the Investor hereby agrees
          to remain bound by the Investment Agreement to the extent
          provided for in the Investment Agreement.  

               If you are in agreement with the foregoing, kindly
          so indicate by signing a counterpart of this letter,
          whereafter it will become a binding agreement between us.

                                        Sincerely,

                                        E.I. DU PONT DE NEMOURS AND
                                         COMPANY

                                        By:  /s/ William F. Kirk   
                                        Name:  William F. Kirk    
                                        Title:  Vice President and General
                                                  Manager


                                        DUPONT CHEMICAL AND 
                                         OPERATIONS, INC.

                                        By:  /s/ Charles L. Downing
                                        Name:  Charles L. Downing
                                        Title:  Vice President and Treasurer


          Agreed and accepted as of 
          the date first written above:

          PIONEER HI-BRED INTERNATIONAL,
           INC.

          By:  /s/ Jerry L. Chicoine  
          Name:  Jerry L. Chicoine   
          Title:  Senior Vice President and
                    Chief Financial Officer






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