MONSANTO CO
8-K, 1998-06-01
CHEMICALS & ALLIED PRODUCTS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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


                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

         Date of Report (Date of earliest event reported): May 31, 1998


                                MONSANTO COMPANY

               (Exact Name of Registrant as Specified in Charter)


        Delaware                       1-2516                    43-0420020
- ------------------------           -------------            --------------------
(State of Incorporation)            (Commission                 (IRS Employer
                                    File Number)             Identification No.)


    800 North Lindbergh Boulevard
         St. Louis, Missouri                                      63167
- ---------------------------------------                        ----------
(Address of Principal Executive Offices)                       (Zip Code)


Registrant's telephone number, including area code:  (314) 694-1000



<PAGE>


ITEM 5.  OTHER EVENTS.

         On June 1, 1998, Monsanto Company (the "Company") and American Home
Products Corporation ("AHP") announced that they entered into a definitive
agreement to combine the two companies in a merger of equals transaction. In the
transaction, AHP shareholders will retain their shares and the Monsanto
shareholders will receive 1.15 shares in the new company for each share of
Monsanto that the Monsanto shareholders own on the date the transaction is
consummated.

         The combined company's board of directors will consist of 22 members,
with representation equally divided between AHP and Monsanto. Monsanto's
Chairman and Chief Executive Officer, Robert B. Shapiro, and AHP's Chairman,
President and Chief Executive Officer, John R. Stafford, will be co-chairmen and
co-CEOs.

         The transaction is subject to, among other things, approval by both
companies' shareholders, normal governmental reviews and other customary
conditions. The merger is intended to qualify as a tax-free reorganization and
to be accounted for on a pooling of interests basis.

         The foregoing description of the transaction is qualified in its
entirety by reference to the Agreement and Plan of Merger, dated as of May 31,
1998 (the "Merger Agreement"), among AHP, MA Sub, Inc., a Delaware corporation
and wholly-owned subsidiary of AHP ("Sub"), and the Company. A copy of the
Merger Agreement is filed as an exhibit hereto and is incorporated by reference
herein.

         On June 1, 1998, the Company and AHP issued a joint press release
announcing the signing of the Merger Agreement. A copy of the joint press
release is filed as an exhibit hereto and is incorporated by reference herein.



ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

     (c)  Exhibits. The following exhibits are filed as part of this report:

             2.1     Agreement and Plan of Merger, dated as of May 31, 1998, 
                     among AHP, Sub and the Company.

            99.1     Joint press release, dated June 1, 1998, issued by the 
                     Company and AHP.


<PAGE>


                                    SIGNATURE


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


Dated:  June 1, 1998

                                       MONSANTO COMPANY


                                       By /s/ Eric R. Fencl
                                          --------------------------------
                                           Name:  Eric R. Fencl
                                           Title: Corporate Counsel and 
                                                  Assistant Secretary





<PAGE>


                                  EXHIBIT INDEX

Exhibit
Number                               Description
- -------                              ------------       
     2.1       Agreement and Plan of Merger, dated as of May 31, 1998, among 
               AHP, Sub and the Company.

    99.1       Joint press release, dated June 1, 1998, issued by the Company 
               and AHP.



================================================================================




                          AGREEMENT AND PLAN OF MERGER


                            DATED AS OF MAY 31, 1998


                                      AMONG


                       AMERICAN HOME PRODUCTS CORPORATION,


                                  MA SUB, INC.


                                       AND


                                MONSANTO COMPANY




================================================================================

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
                                    ARTICLE I

                   THE MERGER................................................ 2
1.1      The Merger.........................................................  2
1.2      Closing............................................................  2
1.3      Effective Time.....................................................  2
1.4      Effects of the Merger..............................................  2
1.5      Certificate of Incorporation.......................................  2
1.6      By-Laws............................................................  3
1.7      Officers and Directors of Surviving Corporation and Newco..........  3
1.8      Effect on Capital Stock............................................  3
1.9      Monsanto Stock Options.............................................  4
1.10     Certain Adjustments................................................  5

                                   ARTICLE II

                             EXCHANGE OF CERTIFICATES.......................  5
2.1      Exchange Fund......................................................  5
2.2      Exchange Procedures................................................  5
2.3      Distributions with Respect to Unexchanged Shares...................  6
2.4      No Further Ownership Rights in Monsanto Common Stock...............  6
2.5      No Fractional Shares of AHP Common Stock...........................  7
2.6      Termination of Exchange Fund.......................................  7
2.7      No Liability.......................................................  7
2.8      Investment of the Exchange Fund....................................  8
2.9      Lost Certificates..................................................  8
2.10     Withholding Rights.................................................  8
2.11     Further Assurances.................................................  8
2.12     Stock Transfer Books...............................................  8
2.13     Affiliates.........................................................  9

                                   ARTICLE III

                           REPRESENTATIONS AND WARRANTIES...................  9
3.1      Representations and Warranties of AHP..............................  9
         (a)     Organization, Standing and Power; Subsidiaries.............  9
         (b)     Capital Structure.......................................... 10
         (c)     Authority; No Conflicts.................................... 11
         (d)     Reports and Financial Statements........................... 12
         (e)     Information Supplied....................................... 13
         (f)     Board Approval............................................. 13
         (g)     Vote Required.............................................. 14

                                       i
<PAGE>

         (h)     Litigation; Compliance with Laws........................... 14
         (i)     Absence of Certain Changes or Events....................... 14
         (j)     Environmental Matters...................................... 15
         (k)     Intellectual Property...................................... 16
         (l)     Brokers or Finders......................................... 16
         (m)     Opinion of AHP Financial Advisor........................... 17
         (n)     Accounting Matters......................................... 17
         (o)     Taxes...................................................... 17
         (p)     Certain Contracts.......................................... 17
         (q)     Specified Litigation....................................... 17
3.2      Representations and Warranties of Monsanto.  ...................... 18
         (a)     Organization, Standing and Power; Subsidiaries............. 18
         (b)     Capital Structure.......................................... 19
         (c)     Authority; No Conflicts.................................... 20
         (d)     Reports and Financial Statements........................... 21
         (e)     Information Supplied....................................... 22
         (f)     Board Approval............................................. 22
         (g)     Vote Required.............................................. 22
         (h)     Litigation; Compliance with Laws........................... 23
         (i)     Absence of Certain Changes or Events....................... 23
         (j)     Environmental Matters...................................... 23
         (k)     Intellectual Property...................................... 24
         (l)     Rights Agreement........................................... 24
         (m)     Brokers or Finders......................................... 24
         (n)     Opinions of Monsanto Financial Advisors.................... 25
         (o)     Accounting Matters......................................... 25
         (p)     Taxes...................................................... 25
         (q)     Certain Contracts.......................................... 25
         (r)     Specified Litigation....................................... 25
3.3      Representations and Warranties of AHP and Merger Sub............... 26
         (a)     Organization............................................... 26
         (b)     Corporate Authorization.................................... 26
         (c)     Non-Contravention.......................................... 26
         (d)     No Business Activities..................................... 26

                                   ARTICLE IV

                      COVENANTS RELATING TO CONDUCT OF BUSINESS............. 26
4.1      Covenants of AHP.  ................................................ 26
         (a)     Ordinary Course............................................ 27
         (b)     Dividends; Changes in Share Capital........................ 27
         (c)     Issuance of Securities..................................... 27
         (d)     Governing Documents........................................ 28
         (e)     No Acquisitions............................................ 28

                                       ii
<PAGE>

         (f)     No Dispositions............................................ 28
         (g)     Investments; Indebtedness.................................. 28
         (h)     Pooling; Tax-Free Qualification............................ 29
         (i)     Compensation............................................... 29
         (j)     Accounting Methods; Income Tax Elections................... 29
         (k)     Certain Agreements......................................... 29
4.2      Covenants of Monsanto.............................................. 29
         (a)     Ordinary Course............................................ 30
         (b)     Dividends; Changes in Share Capital........................ 30
         (c)     Issuance of Securities..................................... 30
         (d)     Governing Documents........................................ 31
         (e)     No Acquisitions............................................ 31
         (f)     No Dispositions............................................ 31
         (g)     Investments; Indebtedness.................................. 32
         (h)     Pooling; Tax-Free Qualification............................ 32
         (i)     Compensation............................................... 32
         (j)     Accounting Methods; Income Tax Elections................... 32
         (k)     Certain Agreements......................................... 32
         (l)     Rights Agreement........................................... 33
4.3      Governmental Filings............................................... 33
4.4      Control of Other Party's Business.................................. 33

                                    ARTICLE V

                ADDITIONAL AGREEMENTS....................................... 33
5.1      Preparation of Proxy Statement; Stockholders Meetings.............. 33
5.2      Newco Board of Directors; Office of the Chairman; Name............. 36
5.3      Access to Information.............................................. 36
5.4      Reasonable Best Efforts............................................ 36
5.5      Acquisition Proposals.............................................. 38
5.6      Employee Benefits Matters.......................................... 39
5.7      Fees and Expenses.................................................. 41
5.8      Directors' and Officers' Indemnification and Insurance............. 41
5.9      Specified Litigation............................................... 42
5.10     Public Announcements............................................... 42
5.11     Accountant's Letters............................................... 42
5.12     Listing of Shares of AHP Common Stock.............................. 43
5.13     Dividends.......................................................... 43
5.14     Affiliates......................................................... 43
5.15     Employment Agreements.............................................. 44



                                      iii
<PAGE>


                                   ARTICLE VI

                 CONDITIONS PRECEDENT....................................... 44
6.1      Conditions to Each Party's Obligation to Effect the Merger......... 44
         (a)     Stockholder Approval....................................... 44
         (b)     No Injunctions or Restraints, Illegality................... 44
         (c)     HSR Act.................................................... 44
         (d)     Governmental and Regulatory Approvals...................... 44
         (e)     NYSE Listing............................................... 45
         (f)     Effectiveness of the Form S-4.............................. 45
         (g)     Pooling.................................................... 45
6.2      Additional Conditions to Obligations of AHP and Merger Sub......... 45
         (a)     Representations and Warranties............................. 45
         (b)     Performance of Obligations of Monsanto.  .................. 46
         (c)     Tax Opinion................................................ 46
         (d)     Rights Agreement........................................... 46
6.3      Additional Conditions to Obligations of Monsanto.  ................ 46
         (a)     Representations and Warranties............................. 46
         (b)     Performance of Obligations of AHP.  ....................... 46
         (c)     Tax Opinion................................................ 47

                                   ARTICLE VII

                              TERMINATION AND AMENDMENT..................... 47
7.1      Termination........................................................ 47
7.2      Effect of Termination.............................................. 52
7.3      Amendment.......................................................... 56
7.4      Extension; Waiver.................................................. 56

                                  ARTICLE VIII

                 GENERAL PROVISIONS......................................... 56
8.1      Non-Survival of Representations, Warranties and Agreements......... 56
8.2      Notices............................................................ 56
8.3      Interpretation..................................................... 57
8.4      Counterparts....................................................... 57
8.5      Entire Agreement; No Third Party Beneficiaries..................... 58
8.6      Governing Law...................................................... 58
8.7      Severability....................................................... 58
8.8      Assignment......................................................... 58
8.9      Submission to Jurisdiction; Waivers................................ 58
8.10     Enforcement........................................................ 59
8.11     Definitions........................................................ 59


                                       iv
<PAGE>

                                                                        
                                LIST OF EXHIBITS


Exhibit           Title
- -------           -----

1.5               Form of Amended and Restated Certificate of Incorporation of
                  Surviving Corporation
1.6(a)            Form of By-Laws of Surviving Corporation
1.6(b)            Form of Amendments to By-Laws of AHP
1.7               Board of Directors of Surviving Corporation
5.2(a)            Board of Directors and Office of the Chairmen of Newco
5.14              Form of Affiliate Letter
6.2(c)(1)         Form of AHP Tax Opinion
6.2(c)(2)         Form of AHP Representations Letter
6.2(c)(3)         Form of Monsanto Representations Letter
6.3(c)(1)         Form of Monsanto Tax Opinion













                                       v
<PAGE>

                  AGREEMENT  AND PLAN OF MERGER,  dated as of May 31, 1998 (this
"Agreement"),  among AMERICAN HOME PRODUCTS CORPORATION,  a Delaware corporation
("AHP"),  MA  SUB,  INC.,  a  Delaware  corporation  and a  direct  wholly-owned
subsidiary of AHP ("Merger Sub"), and MONSANTO COMPANY,  a Delaware  corporation
("Monsanto").


                              W I T N E S S E T H:


                  WHEREAS,  the Boards of  Directors of Monsanto and AHP deem it
advisable  and in the best  interests  of each  corporation  and its  respective
stockholders  that  Monsanto  and AHP engage in a business  combination  as peer
firms in a merger of equals in order to advance the long-term strategic business
interests of Monsanto and AHP;

                  WHEREAS, the combination of Monsanto and AHP shall be effected
by the  terms  of this  Agreement  through  a  merger  as  outlined  below  (the
"Merger");

                  WHEREAS,  in furtherance  thereof,  the  respective  Boards of
Directors  of Monsanto  and AHP have  approved  the  Merger,  upon the terms and
subject to the  conditions set forth in this  Agreement,  pursuant to which each
share of common stock, par value $2.00 per share, of Monsanto  ("Monsanto Common
Stock")  issued and  outstanding  immediately  prior to the  Effective  Time (as
defined in Section 1.3),  other than shares owned or held directly or indirectly
by AHP or directly or indirectly by Monsanto,  will be converted  into the right
to receive shares of common stock,  par value $0.33 1/3 per share,  of AHP ("AHP
Common Stock") as set forth in Section 1.8;

                  WHEREAS, for Federal income tax purposes,  it is intended that
the Merger  shall  qualify  as a  reorganization  within the  meaning of Section
368(a) of the Internal  Revenue Code of 1986, as amended (the  "Code"),  and the
regulations promulgated thereunder; and

                  WHEREAS,  for  accounting  purposes,  it is intended  that the
Merger shall be accounted for as a pooling of interests transaction under United
States generally accepted accounting principles ("GAAP").

                  NOW,  THEREFORE,  in  consideration  of the  foregoing and the
respective  representations,  warranties,  covenants and agreements set forth in
this  Agreement,  and intending to be legally bound hereby,  the parties  hereto
agree as follows:




<PAGE>

                                    ARTICLE I

                                   THE MERGER

                  1.1 The Merger.  Upon the terms and subject to the  conditions
set  forth  in this  Agreement,  and in  accordance  with the  Delaware  General
Corporation Law (the "DGCL"),  Merger Sub shall be merged with and into Monsanto
at the Effective Time. Following the Merger, the separate corporate existence of
Merger Sub shall cease and Monsanto shall continue as the surviving  corporation
(the  "Surviving  Corporation")  under a new name to be mutually  agreed upon by
Monsanto and AHP prior to the Effective Time.

                  1.2 Closing. Subject to the satisfaction or waiver (subject to
applicable  law) of the  conditions  set forth in Article VI, the closing of the
Merger and the transactions  contemplated by this Agreement (the "Closing") will
take place on the second Business Day after the  Determination  Date (as defined
in  Section  7.1(h));  provided,  that if an AHP Stock  Decline  (as  defined in
Section  7.1(h)) or a Monsanto  Stock Decline (as defined in Section 7(i)) shall
have occurred,  the Closing will,  subject to the  foregoing,  take place on the
seventh  Business Day after the  Determination  Date,  unless this Agreement has
been theretofore  terminated  pursuant to its terms, unless another time or date
is agreed to in writing by the  parties  hereto (the actual time and date of the
Closing being  referred to herein as the "Closing  Date").  The Closing shall be
held at the offices of Simpson  Thacher & Bartlett,  425 Lexington  Avenue,  New
York,  New York,  10017,  unless  another  place is agreed to in  writing by the
parties hereto.

                  1.3  Effective  Time.  As soon as  practicable  following  the
satisfaction  of the  conditions  set forth in Article  VI, at the  Closing  the
parties shall (i) file a certificate of merger (the  "Certificate of Merger") in
such  form as is  required  by and  executed  in  accordance  with the  relevant
provisions of the DGCL and (ii) make all other  filings or  recordings  required
under  the  DGCL.  The  Merger  shall  become  effective  at  such  time  as the
Certificate  of Merger is duly filed with the Delaware  Secretary of State or at
such  subsequent  time as AHP and Monsanto shall agree and as shall be specified
in the  Certificate  of Merger (the date and time the Merger  becomes  effective
being the "Effective Time").

                  1.4 Effects of the Merger.  At and after the  Effective  Time,
the Merger  will have the effects set forth in the DGCL.  Without  limiting  the
generality of the foregoing,  and subject thereto, at the Effective Time all the
property, rights,  privileges,  powers and franchises of Monsanto and Merger Sub
shall be vested in the Surviving  Corporation,  and all debts,  liabilities  and
duties of Monsanto and Merger Sub shall become the debts, liabilities and duties
of the Surviving Corporation.

                  1.5  Certificate  of  Incorporation.  (a) The  certificate  of
incorporation of Monsanto, as in effect immediately prior to the Effective Time,
shall be amended  and  restated  so as to read in its  entirety  in the form set
forth as Exhibit 1.5 and, as so amended and restated , shall be the  certificate
of  incorporation  of the Surviving  Corporation,  until  thereafter  changed or
amended as provided therein or by applicable law.

                                       2
<PAGE>

                  (b) The certificate of  incorporation  of AHP shall be amended
effective  as of the  Effective  Time to change its name as  provided in Section
5.2(b) pursuant to Section 253(b) of the DGCL.

                  1.6  By-laws. (a) The by-laws in the form  attached as Exhibit
1.6(a)  shall be the  by-laws  of the  Surviving  Corporation  until  thereafter
changed or amended as provided therein or by applicable law.

                  (b) The  by-laws of AHP shall be amended  effective  as of the
Effective  Time to the effect  provided  in Exhibit  1.6(b),  with such  changes
therein as the parties may mutually agree.

                  1.7 Officers and Directors of Surviving Corporation and Newco.
The officers of Monsanto as of the  Effective  Time shall be the officers of the
Surviving  Corporation,  until the  earlier of their  resignation  or removal or
otherwise ceasing to be an officer or until their respective successors are duly
elected  and  qualified,  as the case may be.  The  directors  of the  Surviving
Corporation  as of the Effective Time shall be as provided in Exhibit 1.7, which
individuals  will serve as  directors  of the  Surviving  Corporation  until the
earlier of their resignation or removal or otherwise ceasing to be a director or
until their respective  successors are duly elected and qualified.  The officers
and directors of AHP as of the Effective Time, which shall change its name as of
the Effective Time to a new name to be mutually  agreed upon by Monsanto and AHP
prior to the Effective Time ("Newco"), will be as provided in Section 5.2.

                  1.8 Effect on Capital Stock.

                  (a) At the Effective  Time by virtue of the Merger and without
any action on the part of the holder  thereof,  each  share of  Monsanto  Common
Stock issued and outstanding immediately prior to the Effective Time (other than
shares of Monsanto  Common Stock owned by AHP or Merger Sub or held by Monsanto,
all of which shall be canceled as provided in Section 1.8(c)) shall be converted
into the right to receive 1.15 shares (the "Exchange Ratio") of AHP Common Stock
(together  with any cash in lieu of fractional  shares of AHP Common Stock to be
paid pursuant to Section 2.5, the "Merger Consideration").

                  (b) As a result of the  Merger and  without  any action on the
part of the  holders  thereof,  at the  Effective  Time,  all shares of Monsanto
Common Stock shall cease to be outstanding and shall be canceled and retired and
shall cease to exist, and each holder of a certificate  which  immediately prior
to the Effective Time  represented  any such shares of Monsanto  Common Stock (a
"Certificate")  shall  thereafter  cease to have any rights with respect to such
shares of Monsanto Common Stock, except as provided herein or by law.

                  (c) Each share of Monsanto  Common  Stock  issued and owned or
held by AHP,  Merger Sub or Monsanto at the Effective  Time shall,  by virtue of
the Merger,  cease to be  outstanding  and shall be canceled  and retired and no
stock of AHP or other consideration shall be delivered in exchange therefor.

                                       3
<PAGE>

                  (d) Each share of common stock,  par value $0.01 per share, of
Merger Sub issued and outstanding immediately prior to the Effective Time, shall
remain  issued,  outstanding  and  unchanged as validly  issued,  fully paid and
nonassessable  shares  of  common  stock,  par value  $0.01  per  share,  of the
Surviving Corporation as of the Effective Time.

                  1.9  Monsanto Stock Options.

                  (a) On or prior to the Effective Time,  Monsanto will take all
action  necessary  such that each  Monsanto  Stock Option (as defined in Section
3.2(b)) that was granted pursuant to the Monsanto Stock Option Plans (as defined
in Section  3.2(b))  prior to the Effective  Time and which remains  outstanding
immediately  prior to the  Effective  Time shall  cease to  represent a right to
acquire shares of Monsanto Common Stock and shall be converted, at the Effective
Time,  into an option to  acquire,  on the same  terms  and  conditions  as were
applicable under the Monsanto Stock Option,  that number of shares of AHP Common
Stock  determined by multiplying  the number of shares of Monsanto  Common Stock
subject  to such  Monsanto  Stock  Option by the  Exchange  Ratio,  rounded,  if
necessary,  to the nearest whole share of AHP Common Stock, at a price per share
(rounded to the nearest one-hundredth of a cent) equal to the per share exercise
price  specified in such Monsanto  Stock Option  divided by the Exchange  Ratio;
provided,  however,  that in the  case of any  Monsanto  Stock  Option  to which
Section 421 of the Code applies by reason of its qualification under Section 422
of the Code,  the option price,  the number of shares subject to such option and
the terms and  conditions  of exercise of such option shall be  determined  in a
manner consistent with the requirements of Section 424(a) of the Code.

                  (b) As soon as  practicable  after the Effective  Time,  Newco
shall  deliver to the  holders of Monsanto  Stock  Options  appropriate  notices
setting forth such holders'  rights  pursuant to the Monsanto Stock Option Plans
(including  that,  by  virtue of the  Merger  and  pursuant  to the terms of the
Monsanto Stock Option Plans, the Monsanto Stock Options have become fully vested
and exercisable) and the agreements evidencing the grants of such Monsanto Stock
Options shall  continue in effect on the same terms and  conditions  (subject to
the  adjustments  required by this Section 1.9 after giving effect to the Merger
and the terms of the Monsanto  Stock Option Plans).  To the extent  permitted by
law,  Newco shall comply with the terms of the  Monsanto  Stock Option Plans and
shall take such reasonable steps as are necessary or required by, and subject to
the provisions of, such Monsanto Stock Option Plans,  to have the Monsanto Stock
Options which  qualified as incentive  stock options prior to the Effective Time
continue to qualify as  incentive  stock  options of Newco  after the  Effective
Time.

                  (c) Newco shall take all corporate action necessary to reserve
for issuance a sufficient number of shares of AHP Common Stock for delivery upon
exercise of Monsanto Stock Options in accordance with this Section 1.9. Promptly
after the Effective Time, Newco shall file a registration  statement on Form S-3
or Form S-8, as the case may be (or any successor or other  appropriate  forms),
with respect to the shares of AHP Common Stock subject to such options and shall
use  commercially  reasonable  efforts to  maintain  the  effectiveness  of such
registration  statement or  registration  statements  (and  maintain the current
status of the prospectus 

                                       4
<PAGE>

or  prospectuses   contained  therein)  for  so  long  as  such  options  remain
outstanding. With respect to those individuals who subsequent to the Merger will
be subject to the reporting  requirements  under Section 16(a) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"),  where applicable,  Newco
shall administer the Monsanto Stock Option Plans in a manner consistent with the
exemptions provided by Rule 16b-3 promulgated under the Exchange Act.


                  1.10  Certain  Adjustments.  If,  between  the  date  of  this
Agreement and the Effective  Time, the  outstanding AHP Common Stock or Monsanto
Common  Stock  shall  have been  changed  into a  different  number of shares or
different  class by  reason  of any  reclassification,  recapitalization,  stock
split,  split-up,  combination  or  exchange  of shares or a stock  dividend  or
dividend  payable in any other  securities  shall be declared with a record date
within such period, or any similar event shall have occurred, the Exchange Ratio
shall be  appropriately  adjusted to provide to the  holders of Monsanto  Common
Stock the same economic  effect as  contemplated by this Agreement prior to such
event.


                                   ARTICLE II

                            EXCHANGE OF CERTIFICATES

                  2.1 Exchange  Fund.  Prior to the  Effective  Time,  AHP shall
appoint a commercial  bank or trust  company  reasonably  acceptable to Monsanto
having net capital of not less than $100,000,000,  or a subsidiary  thereof,  to
act as exchange agent hereunder for the purpose of exchanging  Certificates  for
the Merger  Consideration (the "Exchange  Agent").  At or prior to the Effective
Time,  AHP shall  deposit with the Exchange  Agent,  in trust for the benefit of
holders of shares of Monsanto Common Stock,  certificates  representing  the AHP
Common Stock issuable pursuant to Section 1.8 in exchange for outstanding shares
of Monsanto  Common Stock.  AHP agrees to make  available to the Exchange  Agent
from time to time as needed,  cash  sufficient to pay cash in lieu of fractional
shares  pursuant  to  Section  2.5 and any  dividends  and  other  distributions
pursuant to Section 2.3. Any cash and certificates of AHP Common Stock deposited
with the Exchange Agent shall hereinafter be referred to as the "Exchange Fund".

                  2.2 Exchange  Procedures.  As soon as  reasonably  practicable
after the Effective  Time,  the Surviving  Corporation  shall cause the Exchange
Agent to mail to each holder of a Certificate (i) a letter of transmittal  which
shall specify that delivery shall be effected, and risk of loss and title to the
Certificates  shall pass, only upon delivery of the Certificates to the Exchange
Agent,  and  which  letter  shall  be in  customary  form and  have  such  other
provisions as AHP may reasonably specify and (ii) instructions for effecting the
surrender  of  such   Certificates   in  exchange  for  the  applicable   Merger
Consideration.  Upon  surrender of a Certificate  to the Exchange Agent together
with such letter of transmittal,  duly executed and completed in accordance with
the instructions thereto, and such other documents as may reasonably be required
by the  Exchange  Agent,  the holder of such  Certificate  shall be  entitled to
receive in exchange  therefor  (A) one or more shares of AHP Common Stock (which
shall be in  uncertificated  

                                       5
<PAGE>

book-entry form unless a physical certificate is requested) representing, in the
aggregate,  the whole number of shares that such holder has the right to receive
pursuant to Section 1.8 (after taking into account all shares of Monsanto Common
Stock then held by such  holder) and (B) a check in the amount equal to the cash
that such  holder has the right to receive  pursuant to the  provisions  of this
Article II, including cash in lieu of any fractional  shares of AHP Common Stock
pursuant  to Section  2.5 and  dividends  and other  distributions  pursuant  to
Section  2.3.  No  interest  will be paid or will  accrue  on any  cash  payable
pursuant to Section 2.3 or Section  2.5. In the event of a transfer of ownership
of Monsanto  Common Stock which is not  registered  in the  transfer  records of
Monsanto,  one or more shares of AHP Common Stock evidencing,  in the aggregate,
the proper number of shares of AHP Common Stock, a check in the proper amount of
cash in lieu of any  fractional  shares of AHP Common Stock  pursuant to Section
2.5 and any  dividends or other  distributions  to which such holder is entitled
pursuant to Section  2.3,  may be issued with  respect to such  Monsanto  Common
Stock to such a  transferee  if the  Certificate  representing  such  shares  of
Monsanto  Common Stock is presented to the Exchange  Agent,  accompanied  by all
documents required to evidence and effect such transfer and to evidence that any
applicable stock transfer taxes have been paid.

                  2.3  Distributions  with  Respect to  Unexchanged  Shares.  No
dividends or other distributions  declared or made with respect to shares of AHP
Common  Stock with a record date after the  Effective  Time shall be paid to the
holder of any unsurrendered Certificate with respect to the shares of AHP Common
Stock that such  holder  would be  entitled to receive  upon  surrender  of such
Certificate and no cash payment in lieu of fractional shares of AHP Common Stock
shall be paid to any such holder pursuant to Section 2.5 until such holder shall
surrender such Certificate in accordance with Section 2.2. Subject to the effect
of applicable laws, following surrender of any such Certificate,  there shall be
paid to such holder of shares of AHP Common Stock issuable in exchange therefor,
without interest,  (a) promptly after the time of such surrender,  the amount of
any cash payable in lieu of fractional  shares of AHP Common Stock to which such
holder is entitled  pursuant to Section 2.5 and the amount of dividends or other
distributions  with a record date after the Effective Time theretofore paid with
respect to such whole  shares of AHP Common  Stock,  and (b) at the  appropriate
payment date, the amount of dividends or other  distributions with a record date
after  the  Effective  Time  but  prior to such  surrender  and a  payment  date
subsequent to such  surrender  payable with respect to such shares of AHP Common
Stock.

                  2.4  No Further Ownership Rights in Monsanto Common Stock. All
shares of AHP Common  Stock  issued and cash paid upon  conversion  of shares of
Monsanto Common Stock in accordance with the terms of Article I and this Article
II  (including  any cash paid pursuant to Section 2.3 or 2.5) shall be deemed to
have been issued or paid in full  satisfaction  of all rights  pertaining to the
shares of Monsanto Common Stock.




                                       6
<PAGE>

                  2.5 No Fractional Shares of AHP Common Stock.

                  (a) No  certificates  or scrip or shares of AHP  Common  Stock
representing  fractional  shares of AHP Common Stock or book-entry credit of the
same shall be issued upon the  surrender for exchange of  Certificates  and such
fractional share interests will not entitle the owner thereof to vote or to have
any rights of a shareholder of AHP or a holder of shares of AHP Common Stock.

                  (b)  Notwithstanding  any other  provision of this  Agreement,
each holder of shares of Monsanto Common Stock exchanged  pursuant to the Merger
who would  otherwise  have been entitled to receive a fraction of a share of AHP
Common  Stock  (after  taking into  account all  Certificates  delivered by such
holder) shall  receive,  in lieu thereof,  cash (without  interest) in an amount
equal to the product of (i) such  fractional part of a share of AHP Common Stock
multiplied  by (ii) the closing price for a share of AHP Common Stock on the New
York Stock Exchange,  Inc. ("NYSE")  Composite  Transactions Tape on the date of
the  Effective  Time or, if such date is not a Business  Day,  the  Business Day
immediately  following the date on which the Effective Time occurs.  As promptly
as practicable after the determination of the amount of cash, if any, to be paid
to holders of fractional interests,  the Exchange Agent shall so notify AHP, and
AHP shall  cause the  Surviving  Corporation  to deposit  such  amount  with the
Exchange  Agent and shall cause the Exchange  Agent to forward  payments to such
holders of  fractional  interests  subject to and in  accordance  with the terms
hereof.

                  2.6  Termination of Exchange Fund. Any portion of the Exchange
Fund which remains  undistributed  to the holders of Certificates for six months
after the  Effective  Time shall be delivered to the  Surviving  Corporation  or
otherwise on the  instruction of the Surviving  Corporation,  and any holders of
the  Certificates  who have not theretofore  complied with this Article II shall
thereafter  look  only to the  Surviving  Corporation  and  AHP  for the  Merger
Consideration  with  respect to the shares of  Monsanto  Common  Stock  formerly
represented  thereby to which such holders are entitled  pursuant to Section 1.8
and Section  2.2, any cash in lieu of  fractional  shares of AHP Common Stock to
which such  holders are  entitled  pursuant to Section 2.5 and any  dividends or
distributions  with  respect to shares of AHP Common Stock to which such holders
are entitled  pursuant to Section  2.3.  Any such  portion of the Exchange  Fund
remaining  unclaimed  by holders of shares of Monsanto  Common  Stock five years
after the Effective Time (or such earlier date immediately prior to such time as
such amounts would otherwise  escheat to or become property of any  Governmental
Entity (as defined in Section  3.1(c)(iii))  shall,  to the extent  permitted by
law,  become the  property of the  Surviving  Corporation  free and clear of any
claims or interest of any Person previously entitled thereto.

                  2.7  No Liability.  None of AHP,  Merger  Sub,  Monsanto,  the
Surviving  Corporation  or the  Exchange  Agent shall be liable to any Person in
respect of any Merger Consideration from the Exchange Fund delivered to a public
official pursuant to any applicable abandoned property, escheat or similar law.

                                       7
<PAGE>

                  2.8  Investment of the Exchange Fund. The Exchange Agent shall
invest any cash  included in the  Exchange  Fund as  directed  by the  Surviving
Corporation on a daily basis.  Any interest and other income resulting from such
investments shall promptly be paid to the Surviving Corporation.

                  2.9 Lost  Certificates.  If any  Certificate  shall  have been
lost,  stolen or destroyed,  upon the making of an affidavit of that fact by the
Person  claiming  such  Certificate  to be lost,  stolen or  destroyed  and,  if
required by the Surviving  Corporation,  the posting by such Person of a bond in
such  reasonable  amount as the  Surviving  Corporation  may direct as indemnity
against any claim that may be made against it with respect to such  Certificate,
the Exchange  Agent will deliver in exchange for such lost,  stolen or destroyed
Certificate the applicable  Merger  Consideration  with respect to the shares of
Monsanto  Common  Stock  formerly  represented  thereby,  any  cash  in  lieu of
fractional shares of AHP Common Stock, and unpaid dividends and distributions on
shares of AHP Common  Stock  deliverable  in respect  thereof,  pursuant to this
Agreement.

                  2.10 Withholding Rights. Each of the Surviving Corporation and
AHP shall be entitled to deduct and withhold  from the  consideration  otherwise
payable  pursuant to this  Agreement to any holder of shares of Monsanto  Common
Stock such amounts as it is required to deduct and withhold  with respect to the
making of such payment under the Code and the rules and regulations  promulgated
thereunder,  or any provision of state,  local or foreign tax law. To the extent
that amounts are so withheld by the  Surviving  Corporation  or AHP, as the case
may be,  such  withheld  amounts  shall  be  treated  for all  purposes  of this
Agreement  as having  been paid to the holder of the shares of  Monsanto  Common
Stock in  respect  of  which  such  deduction  and  withholding  was made by the
Surviving Corporation or AHP, as the case may be.

                  2.11 Further Assurances.  At and after the Effective Time, the
officers and  directors  of the  Surviving  Corporation  will be  authorized  to
execute and  deliver,  in the name and on behalf of Monsanto or Merger Sub,  any
deeds, bills of sale,  assignments or assurances and to take and do, in the name
and on behalf of Monsanto or Merger Sub,  any other  actions and things to vest,
perfect or confirm of record or otherwise in the Surviving  Corporation  any and
all right, title and interest in, to and under any of the rights,  properties or
assets  acquired or to be acquired by the Surviving  Corporation as a result of,
or in connection with, the Merger.

                  2.12  Stock  Transfer  Books.  The  stock  transfer  books  of
Monsanto shall be closed  immediately upon the Effective Time and there shall be
no  further  registration  of  transfers  of shares  of  Monsanto  Common  Stock
thereafter  on the records of  Monsanto.  On or after the  Effective  Time,  any
Certificates  presented  to the  Exchange  Agent or AHP for any reason  shall be
converted into the Merger  Consideration  with respect to the shares of Monsanto
Common Stock formerly represented thereby, any cash in lieu of fractional shares
of AHP Common  Stock to which the  holders  thereof  are  entitled  pursuant  to
Section  2.5 and any  dividends  or other  distributions  to which  the  holders
thereof are entitled pursuant to Section 2.3.

                                       8
<PAGE>

                  2.13  Affiliates.  Notwithstanding  anything  to the  contrary
herein, no shares of AHP Common Stock or cash shall be delivered to a Person who
may be deemed an "affiliate" of Monsanto in accordance  with Section 5.14 hereof
for  purposes  of Rule 145 under the  Securities  Act of 1933,  as amended  (the
"Securities  Act") or for  purposes  of  qualifying  the Merger  for  pooling of
interests  accounting  treatment  under Opinion 16 of the Accounting  Principles
Board and  applicable  rules and  regulations  of the  Securities  and  Exchange
Commission (the "SEC") until such Person has executed and delivered an Affiliate
Agreement (as defined in Section 5.14) to AHP.


                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

                  3.1 Representations and Warranties of AHP. Except as set forth
in the  AHP  Disclosure  Schedule  delivered  by AHP to  Monsanto  prior  to the
execution of this Agreement  (the "AHP  Disclosure  Schedule")  (each section of
which  qualifies the  correspondingly  numbered  representation  and warranty or
covenant  to the extent  specified  therein)  AHP  represents  and  warrants  to
Monsanto as follows:

                  (a) Organization, Standing and Power; Subsidiaries.

                          (i)  Each of AHP  and  each  of its  Subsidiaries  (as
         defined in  Section  8.11) is a  corporation  duly  organized,  validly
         existing and in good  standing  under the laws of its  jurisdiction  of
         incorporation or organization, has the requisite power and authority to
         own,  lease and operate its  properties and to carry on its business as
         now being  conducted,  except  where the  failure  to be so  organized,
         existing and in good standing or to have such power and authority would
         not  reasonably be expected to have a Material  Adverse  Effect on AHP,
         and is duly  qualified  and in good  standing  to do  business  in each
         jurisdiction  in which the nature of its  business or the  ownership or
         leasing of its properties makes such qualification necessary other than
         in such jurisdictions  where the failure so to qualify or to be in good
         standing  would not  reasonably be expected to have a Material  Adverse
         Effect on AHP.  The  copies of the  certificate  of  incorporation  and
         by-laws of AHP which were  previously  furnished  or made  available to
         Monsanto are true,  complete and correct copies of such documents as in
         effect on the date of this Agreement.

                          (ii)  Exhibit 21 to AHP's  Annual  Report on Form 10-K
         for the year ended December 31, 1997 includes all the  Subsidiaries  of
         AHP which as of the date of this Agreement are Significant Subsidiaries
         (as  defined  in  Rule  1-02 of  Regulation  S-X of the  SEC).  All the
         outstanding  shares of capital stock of, or other equity  interests in,
         each such Significant Subsidiary have been validly issued and are fully
         paid and  nonassessable  and are owned  directly or  indirectly by AHP,
         free and clear of all pledges, claims, liens, charges, encumbrances and
         security  interests  of any  kind or  nature  whatsoever  (collectively
         "Liens") and free of any other  restriction  (including any 

                                       9
<PAGE>

         restriction  on the right to vote,  sell or  otherwise  dispose of such
         capital stock or other ownership interests). Except as set forth in the
         AHP SEC Reports, as of the date of this Agreement,  neither AHP nor any
         of its  Subsidiaries  directly or indirectly owns any equity or similar
         interest  in,  or any  interest  convertible  into or  exchangeable  or
         exercisable for, any corporation,  partnership,  joint venture or other
         business  association or entity (other than  Subsidiaries),  that is or
         would reasonably be expected to be material to AHP and its Subsidiaries
         taken as a whole.

                  (b)  Capital Structure.

                          (i) As of May 26, 1998, the  authorized  capital stock
         of AHP  consisted  of (A)  2,400,000,000  shares of AHP Common Stock of
         which 1,314,414,504 shares were outstanding and 107,498,740 shares were
         held in the  treasury  of AHP and (B)  5,000,000  shares  of  Preferred
         Stock, par value $2.50 per share, of which 27,717 shares  designated as
         $2 Convertible  Preferred Stock (the "$2 Convertible  Preferred Stock")
         were outstanding. As of May 26, 1998, AHP had reserved or has available
         997,812 shares of AHP Common Stock for issuance upon  conversion of the
         $2 Convertible  Preferred Stock. Since May 26, 1998 to the date of this
         Agreement,  there have been no issuances of shares of the capital stock
         of AHP or any other  securities  of AHP other than  issuances of shares
         upon  conversion of the $2 Convertible  Preferred  Stock or pursuant to
         options or rights  outstanding  as of May 26,  1998  under the  Benefit
         Plans  (as  defined  in  Section   8.11(a))  of  AHP.  All  issued  and
         outstanding  shares of the  capital  stock of AHP are duly  authorized,
         validly issued,  fully paid and nonassessable,  and no class of capital
         stock is entitled to preemptive  rights.  There were  outstanding as of
         May 26, 1998 no options,  warrants or other  rights to acquire  capital
         stock from AHP other than options  representing  in the  aggregate  the
         right to purchase 80,904,028 shares of AHP Common Stock  (collectively,
         the "AHP Stock Options") under AHP's 1980 Stock Option Plan, AHP's 1985
         Stock Option Plan,  AHP's  Management  Incentive Plan, AHP's 1990 Stock
         Incentive  Plan,  AHP's 1993 Stock  Incentive Plan and AHP's 1996 Stock
         Incentive Plan  (collectively,  the "AHP Stock Option Plans").  Section
         3.1(b) of the AHP Disclosure Schedule sets forth a complete and correct
         list,  as of May 26, 1998,  of the number of shares of AHP Common Stock
         subject to AHP Stock Options or other rights to purchase or receive AHP
         Common Stock  granted  under the AHP Benefit  Plans or  otherwise,  the
         dates of grant and the exercise prices thereof.  No options or warrants
         or other rights to acquire  capital  stock from AHP have been issued or
         granted since May 26, 1998 to the date of this Agreement.

                          (ii) No bonds, debentures, notes or other indebtedness
         of AHP  having  the right to vote on any  matters  on which  holders of
         capital  stock  of AHP may vote  ("AHP  Voting  Debt")  are  issued  or
         outstanding.

                          (iii)  Except as  otherwise  set forth in this Section
         3.1(b) and as  contemplated  by Section 1.8 and Section  1.9, as of the
         date of this  Agreement,  there are no securities,  options,  warrants,
         calls, rights, commitments, agreements, arrangements or 

                                       10
<PAGE>

         undertakings  of any kind to which AHP or any of its  Subsidiaries is a
         party or by which  any of them is  bound  obligating  AHP or any of its
         Subsidiaries  to  issue,  deliver  or  sell,  or  cause  to be  issued,
         delivered or sold,  additional  shares of capital stock or other voting
         securities of AHP or any of its  Subsidiaries  or obligating AHP or any
         of its  Subsidiaries  to issue,  grant,  extend or enter  into any such
         security,   option,  warrant,  call,  right,   commitment,   agreement,
         arrangement or undertaking. As of the date of this Agreement, there are
         no outstanding  obligations of AHP, any of its  Subsidiaries or, to the
         knowledge of AHP, any of its Majority  Owned  Affiliates to repurchase,
         redeem or otherwise  acquire any shares of capital stock of AHP, any of
         its Subsidiaries or any of its Majority Owned Affiliates.

                  (c) Authority; No Conflicts.

                          (i)  AHP  has  all  requisite   corporate   power  and
         authority  to  enter  into  this   Agreement  and  to  consummate   the
         transactions  contemplated hereby, subject, in the case of the issuance
         of the  shares of AHP  Common  Stock to be issued  in the  Merger  (the
         "Share  Issuance"),  to the approval by the  stockholders of AHP of the
         Share Issuance by the Required AHP Vote (as defined in Section 3.1(g)).
         The execution and delivery of this  Agreement and the  consummation  of
         the transactions  contemplated  hereby have been duly authorized by all
         necessary  corporate  action on the part of AHP, subject in the case of
         the Share Issuance,  to the approval by the  stockholders of AHP of the
         Share  Issuance by the Required AHP Vote.  This Agreement has been duly
         executed  and  delivered  by AHP and  constitutes  a valid and  binding
         agreement of AHP,  enforceable against it in accordance with its terms,
         except as such enforceability may be limited by bankruptcy, insolvency,
         reorganization,  moratorium  and similar laws  relating to or affecting
         creditors  generally or by general  equity  principles  (regardless  of
         whether such  enforceability is considered in a proceeding in equity or
         at law).

                          (ii) The execution  and delivery of this  Agreement by
         AHP does not or will not, as the case may be, and the  consummation  by
         AHP of the Merger and the other transactions  contemplated  hereby will
         not,  conflict  with,  or result in any  violation  of, or constitute a
         default (with or without  notice or lapse of time,  or both) under,  or
         give  rise  to a  right  of  termination,  amendment,  cancellation  or
         acceleration of any obligation or the loss of a material benefit under,
         or the creation of a lien, pledge,  security interest,  charge or other
         encumbrance on any assets (any such conflict, violation, default, right
         of  termination,  amendment,  cancellation  or  acceleration,  loss  or
         creation,  a  "Violation")  pursuant  to:  (A)  any  provision  of  the
         certificate of incorporation or by-laws of AHP, any material Subsidiary
         of AHP  or,  to the  knowledge  of  AHP,  any  of  its  Majority  Owned
         Affiliates, or (B) except as would not reasonably be expected to have a
         Material  Adverse  Effect on AHP or,  to the  knowledge  of AHP,  Newco
         following  the Merger,  subject to  obtaining  or making the  consents,
         approvals,  orders,  authorizations,  registrations,  declarations  and
         filings  referred  to in  paragraph  (iii)  below,  any loan or  credit
         agreement,  note,  mortgage,  bond,  indenture,  lease, benefit plan or
         other agreement, obligation, instrument, permit, concession, franchise,
         license,  judgment,  order, decree,  statute,  law, 

                                       11
<PAGE>

         ordinance,  rule or regulation applicable to AHP, any Subsidiary of AHP
         or, to the knowledge of AHP, any of its Majority Owned  Affiliates,  or
         their respective properties or assets.

                          (iii) No consent, approval, order or authorization of,
         or  registration,   declaration  or  filing  with,  any  supranational,
         national,   state,   municipal,   local  or  foreign  government,   any
         instrumentality,   subdivision,   court,   administrative   agency   or
         commission or other authority  thereof,  or any  quasi-governmental  or
         private body  exercising  any  regulatory,  taxing,  importing or other
         governmental or quasi-governmental authority (a "Governmental Entity"),
         is  required  by or with  respect  to AHP or any  Subsidiary  of AHP in
         connection  with the execution and delivery of this Agreement by AHP or
         the consummation of the Merger and the other transactions  contemplated
         hereby,  except  for those  required  under or in  relation  to (A) the
         Hart-Scott-Rodino  Antitrust  Improvements Act of 1976, as amended (the
         "HSR  Act"),  (B) state  securities  or "blue  sky" laws (the "Blue Sky
         Laws"), (C) the Securities Act, (D) the Exchange Act, (E) the DGCL with
         respect  to the  filing of the  Certificate  of  Merger,  (F) rules and
         regulations  of the NYSE,  (G) antitrust or other  competition  laws of
         other  jurisdictions,   and  (H)  such  consents,   approvals,  orders,
         authorizations,  registrations, declarations and filings the failure of
         which to make or obtain  would not  reasonably  be  expected  to have a
         Material   Adverse  Effect  on  AHP.   Consents,   approvals,   orders,
         authorizations,  registrations, declarations and filings required under
         or in  relation  to any of the  foregoing  clauses  (A) through (G) are
         hereinafter referred to as "Necessary Consents".

                  (d) Reports and Financial Statements.

                          (i)   AHP  has   filed   all   required   registration
         statements,  prospectuses,  reports,  schedules,  forms, statements and
         other  documents  required to be filed by it with the SEC since January
         1, 1997  (collectively,  including all exhibits  thereto,  the "AHP SEC
         Reports").  No Subsidiary of AHP is required to file any form,  report,
         registration statement, prospectus or other document with the SEC. None
         of the AHP SEC Reports,  as of their  respective dates (and, if amended
         or  superseded  by a filing prior to the date of this  Agreement or the
         Closing  Date,  then on the  date of such  filing),  contained  or will
         contain any untrue statement of a material fact or omitted or will omit
         to state a material fact required to be stated  therein or necessary to
         make the statements  therein, in light of the circumstances under which
         they were made, not misleading.  The AHP SEC Reports  together with any
         public  announcements  in a news  release  issued by the Dow Jones news
         service or any equivalent  service (a "Dow Jones News Release") made by
         AHP after the date hereof,  taken as a whole,  as of the Effective Time
         will not contain  any untrue  statement  of a material  fact or omit to
         state a material  fact  required to be stated  therein or  necessary to
         make the statements therein, in light of the circumstances  existing as
         of the Effective Time, not misleading. Each of the financial statements
         (including the related notes) included in the AHP SEC Reports  presents
         fairly, in all material respects,  the consolidated  financial position
         and  consolidated  results of operations  and cash flows of AHP and its
         Subsidiaries as of the respective  dates or for the respective  periods
         set forth 

                                       12
<PAGE>

         therein,  all in conformity with GAAP  consistently  applied during the
         periods involved except as otherwise noted therein, and subject, in the
         case of the  unaudited  interim  financial  statements,  to normal  and
         recurring year-end  adjustments that have not been and are not expected
         to be  material  in amount.  All of such AHP SEC  Reports,  as of their
         respective dates (and as of the date of any amendment to the respective
         AHP SEC Report),  complied as to form in all material respects with the
         applicable  requirements of the Securities Act and the Exchange Act and
         the rules and regulations promulgated thereunder.

                          (ii) Except as disclosed in the AHP SEC Reports  filed
         prior  to the  date  hereof,  since  December  31,  1997,  AHP  and its
         Subsidiaries  have not  incurred any  liabilities  that are of a nature
         that would be required to be  disclosed  on a balance  sheet of AHP and
         its  Subsidiaries or the footnotes  thereto prepared in conformity with
         GAAP,  other than (A)  liabilities  incurred in the ordinary  course of
         business or (B)  liabilities  that would not  reasonably be expected to
         have a Material Adverse Effect on AHP.

                  (e) Information Supplied.

                          (i) None of the information supplied or to be supplied
         by AHP for inclusion or  incorporation by reference in (A) the Form S-4
         (as  defined  in Section  5.1) will,  at the time the Form S-4 is filed
         with the SEC, at any time it is amended or  supplemented or at the time
         it becomes  effective  under the  Securities  Act,  contain  any untrue
         statement  of a  material  fact or  omit to  state  any  material  fact
         required  to be stated  therein  or  necessary  to make the  statements
         therein not misleading and (B) the Joint Proxy Statement/Prospectus (as
         defined  in  Section  5.1)  will,  on the  date it is first  mailed  to
         Monsanto  stockholders  or  AHP  stockholders  or at  the  time  of the
         Monsanto  Stockholders Meeting or the AHP Stockholders Meeting (each as
         defined in Section  5.1),  contain any untrue  statement  of a material
         fact or omit to state any 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.  The Form S-4
         and the Joint Proxy  Statement/Prospectus will comply as to form in all
         material  respects  with the  requirements  of the Exchange Act and the
         Securities Act and the rules and regulations of the SEC thereunder.

                          (ii)  Notwithstanding the foregoing provisions of this
         Section  3.1(e),  no  representation  or  warranty  is made by AHP with
         respect to statements made or incorporated by reference in the Form S-4
         or the Joint Proxy  Statement/Prospectus  based on information supplied
         by Monsanto for inclusion or incorporation by reference therein.

                  (f)  Board  Approval.  The  Board  of  Directors  of  AHP,  by
resolutions duly adopted by unanimous vote at a meeting duly called and held and
not  subsequently  rescinded or modified in any way (the "AHP Board  Approval"),
has duly (i)  determined  that this  Agreement and the Merger are fair to and in
the best interests of AHP and its  stockholders,  (ii) approved this  Agreement,
the Merger and the Share Issuance and (iii) recommended that the stockholders of

                                       13
<PAGE>

AHP approve the Share Issuance and directed that the Share Issuance be submitted
for consideration by AHP's stockholders at the AHP Stockholders Meeting. The AHP
Board  Approval  constitutes  approval  of this  Agreement  and the  Merger  for
purposes of Section 203 of the DGCL. To the knowledge of AHP, except for Section
203 of the  DGCL  (which  has been  rendered  inapplicable),  no state  takeover
statute  is  applicable  to the  Merger or the other  transactions  contemplated
hereby.

                  (g)  Vote Required. The affirmative  vote of holders of shares
of AHP  Common  Stock  and  shares of $2  Convertible  Preferred  Stock,  voting
together as a single class, representing a majority of the total votes cast at a
meeting of the holders of outstanding shares of AHP Common Stock and outstanding
shares of $2 Convertible  Preferred Stock (the "Required AHP Vote"), is the only
vote of the holders of any class or series of AHP  capital  stock  necessary  to
approve the transactions contemplated by the Merger Agreement and the Merger and
the Share Issuance.

                  (h) Litigation; Compliance with Laws.

                          (i) Except as disclosed  in the AHP SEC Reports  filed
         prior  to the date of this  Agreement,  there  is no  suit,  action  or
         proceeding pending or, to the knowledge of AHP, threatened,  against or
         affecting  AHP  or  any  Subsidiary  of  AHP  having,  or  which  would
         reasonably be expected to have a Material Adverse Effect on AHP, nor is
         there  any  judgment,  decree,   injunction,   rule  or  order  of  any
         Governmental  Entity  or  arbitrator  outstanding  against  AHP  or any
         Subsidiary of AHP having, or which reasonably would be expected to have
         a Material Adverse Effect on AHP.

                          (ii) Except as disclosed in the AHP SEC Reports  filed
         prior to the date of this  Agreement and except as would not reasonably
         be  expected  to have a  Material  Adverse  Effect on AHP,  AHP and its
         Subsidiaries hold all permits, licenses, variances,  exemptions, orders
         and approvals of all Governmental  Entities which are necessary for the
         operation of the  businesses  of AHP and its  Subsidiaries,  taken as a
         whole (the "AHP Permits").  AHP and its  Subsidiaries are in compliance
         with the  terms of the AHP  Permits,  except  where the  failure  so to
         comply  would not  reasonably  be expected  to have a Material  Adverse
         Effect on AHP.  Except as disclosed in the AHP SEC Reports  filed prior
         to  the  date  of  this  Agreement,  the  businesses  of  AHP  and  its
         Subsidiaries  are not being  conducted in violation of, and AHP has not
         received any notices of violations with respect to, any law,  ordinance
         or  regulation  of  any  Governmental   Entity,   except  for  possible
         violations  which would not  reasonably  be expected to have a Material
         Adverse Effect on AHP.

                  (i)  Absence  of  Certain   Changes  or  Events.   Except  for
liabilities  incurred in  connection  with this  Agreement  or the  transactions
contemplated  hereby,  except as disclosed in the AHP SEC Reports filed prior to
the date of this  Agreement,  and  except as  permitted  by Section  4.1,  since
December 31, 1997, AHP and its  Subsidiaries  have conducted their business only
in the ordinary  course and there has not been (i) any change,  circumstance  or
event which 

                                       14
<PAGE>

has had, or would  reasonably be expected to have, a Material  Adverse Effect on
AHP or (ii) any action taken by AHP or any of its Subsidiaries during the period
from December 31, 1997 through the date of this Agreement  that, if taken during
the period from the date of this  Agreement  through the Effective  Time,  would
constitute a breach of Section 4.1.

                  (j) Environmental  Matters.  Except as would not reasonably be
expected to have a Material Adverse Effect on AHP and except as disclosed in the
AHP SEC Reports filed prior to the date of this  Agreement (i) the operations of
AHP and its Subsidiaries  have been and are in compliance with all Environmental
Laws and with all licenses  required by  Environmental  Laws (as defined below),
(ii) there are no pending  or, to the  knowledge  of AHP,  threatened,  actions,
suits,  claims,  investigations or other proceedings  (collectively,  "Actions")
under or pursuant to  Environmental  Laws  against  AHP or its  Subsidiaries  or
involving  any real property  currently  or, to the  knowledge of AHP,  formerly
owned,  operated  or  leased  by AHP or its  Subsidiaries,  (iii)  AHP  and  its
Subsidiaries  are not  subject  to any  Environmental  Liabilities  (as  defined
below),  and, to the  knowledge of AHP, no facts,  circumstances  or  conditions
relating to, arising from,  associated with or attributable to any real property
currently or, to the knowledge of AHP, formerly owned, operated or leased by AHP
or its Subsidiaries or operations thereon would reasonably be expected to result
in Environmental Liabilities,  (iv) all real property owned and to the knowledge
of AHP all real property  operated or leased by AHP or its  Subsidiaries is free
of contamination  from Hazardous  Material (as defined below) that would have an
adverse effect on human health or the environment and (v) there is not now, nor,
to the  knowledge of AHP,  has there been in the past,  on, in or under any real
property  owned,  leased or operated by AHP or any of its  predecessors  (a) any
underground  storage tanks regulated pursuant to 40 C.F.R. Part 280 or delegated
state programs, dikes or impoundments containing more than a reportable quantity
of Hazardous Materials, (b) any friable asbestos-containing materials or (c) any
polychlorinated biphenyls.

                  As used in this Agreement,  "Environmental Laws" means any and
all  federal,  state,  local or  municipal  laws,  rules,  orders,  regulations,
statutes,   ordinances,   codes,   decisions,   injunctions,   orders,  decrees,
requirements of any Governmental  Entity,  any and all common law  requirements,
rules and bases of liability  regulating,  relating to or imposing  liability or
standards of conduct concerning pollution,  Hazardous Materials or protection of
human health, safety or the environment, as currently in effect and includes the
Comprehensive Environmental Response,  Compensation and Liability Act, 42 U.S.C.
[Section] 9601 et seq., the Hazardous  Materials  Transportation  Act, 49 U.S.C.
[Section]  1801 et seq., the Resource  Conservation  and Recovery Act, 42 U.S.C.
[Section] 6901 et seq.,  the Clean Water Act, 33 U.S.C.  [Section] 1251 et seq.,
the  Clean Air Act,  33  U.S.C.  [Section]  2601 et seq.,  the Toxic  Substances
Control  Act,  15  U.S.C.  [Section]  2601 et  seq.,  the  Federal  Insecticide,
Fungicide and Rodenticide  Act, 7 U.S.C.,  [Section] 136 et seq.,  Occupational
Safety and Health Act 29 U.S.C.  [Section] 651 et seq. and the Oil Pollution Act
of 1990,  33 U.S.C.  [Section]  2701 et seq.,  as such laws have been amended or
supplemented,   and  the  regulations  promulgated  pursuant  thereto,  and  all
analogous  state or local statutes.  As used in this  Agreement,  "Environmental
Liabilities"  with  respect to any person  means any and all  liabilities  of or
relating to such person or any of its  Subsidiaries  (including any entity which
is,  in  whole  or in  part,  a  predecessor  of  such  person  or any  of  such
Subsidiaries), whether vested or unvested, contingent or fixed, actual

                                       15
<PAGE>

or  potential,  known or  unknown,  which (i) arise  under or relate to  matters
covered by Environmental Laws and (ii) relate to actions occurring or conditions
existing on or prior to the Closing Date. As used in this Agreement,  "Hazardous
Materials"  means  any  hazardous  or toxic  substances,  materials  or  wastes,
defined,  listed,  classified or regulated as such in or under any Environmental
Laws which  includes  petroleum,  petroleum  products,  friable  asbestos,  urea
formaldehyde and polychlorinated biphenyls.

                  (k) Intellectual  Property.  Except as would not reasonably be
expected to have a Material Adverse Effect on AHP and except as disclosed in the
AHP SEC Reports  filed prior to the date of the  Agreement:  (a) AHP and each of
its  Subsidiaries  owns, or is licensed to use (in each case,  free and clear of
any liens),  all  Intellectual  Property (as defined below) used in or necessary
for the  conduct of its  business  as  currently  conducted;  (b) the use of any
Intellectual  Property  by AHP and its  Subsidiaries  does  not  infringe  on or
otherwise  violate  the  rights  of any  Person  and is in  accordance  with any
applicable license pursuant to which AHP or any Subsidiary acquired the right to
use any  Intellectual  Property;  (c) to the  knowledge  of AHP,  no  Person  is
challenging, infringing on or otherwise violating any right of AHP or any of its
Subsidiaries with respect to any Intellectual  Property owned by and/or licensed
to AHP or its Subsidiaries;  and (d) neither AHP nor any of its Subsidiaries has
received  any  written   notice  of  any  pending  claim  with  respect  to  any
Intellectual  Property used by AHP and its  Subsidiaries and to its knowledge no
Intellectual  Property owned and/or licensed by AHP or its Subsidiaries is being
used or enforced in a manner that would result in the abandonment,  cancellation
or  unenforceability  of  such  Intellectual  Property.  For  purposes  of  this
Agreement,  "Intellectual Property" shall mean trademarks,  service marks, brand
names,  certification  marks,  trade dress and other indications of origin,  the
goodwill associated with the foregoing and registrations in any jurisdiction of,
and applications in any jurisdiction to register,  the foregoing,  including any
extension,  modification  or renewal of any such  registration  or  application;
inventions,   discoveries  and  ideas,   whether   patentable  or  not,  in  any
jurisdiction;  patents, applications for patents (including, without limitation,
divisions,  continuations,  continuations in part and renewal applications), and
any renewals,  extensions or reissues thereof,  in any  jurisdiction;  nonpublic
information,  trade  secrets  and  confidential  information  and  rights in any
jurisdiction to limit the use or disclosure thereof by any person;  writings and
other works, whether copyrightable or not, in any jurisdiction; registrations or
applications  for  registration  of  copyrights  in any  jurisdiction,  and  any
renewals or extensions thereof; any similar intellectual property or proprietary
rights;  and any claims or causes of action  arising  out of or  relating to any
infringement or misappropriation of any of the foregoing.

                  (l) Brokers or Finders. No agent,  broker,  investment banker,
financial advisor or other firm or Person is or will be entitled to any broker's
or finder's fee or any other similar commission or fee in connection with any of
the transactions  contemplated by this Agreement based upon arrangements made by
or on  behalf  of AHP,  except  Bear,  Stearns & Co.  Inc.  (the "AHP  Financial
Advisor"),  whose fees and expenses will be paid by AHP in accordance with AHP's
agreement with such firm, a copy of which has been provided to Monsanto.

                                       16
<PAGE>

                  (m) Opinion of AHP  Financial  Advisor.  AHP has  received the
opinion of the AHP Financial Advisor,  dated the date of this Agreement,  to the
effect that, as of such date, the Exchange Ratio is fair, from a financial point
of view,  to AHP and its  stockholders,  a copy of which  opinion  has been made
available to Monsanto.

                  (n) Accounting  Matters.  To the knowledge of AHP, neither AHP
nor any of its  affiliates  has taken or agreed to take any  action  that  would
prevent AHP from  accounting for the Merger as a "pooling of  interests".  At or
prior to the date hereof,  AHP has received a letter from its independent public
accountants addressed to AHP, with a copy to Monsanto, to the effect that, based
upon representations  provided by AHP and Monsanto and a poolability letter from
the independent public  accountants of Monsanto,  accounting for the Merger as a
pooling of interests  under Opinion 16 of the  Accounting  Principles  Board and
applicable SEC rules and regulations is appropriate if the Merger is consummated
and closed as contemplated by this Agreement.

                  (o) Taxes.  Each of AHP and its Subsidiaries has filed all Tax
Returns  required to have been filed (or extensions have been duly obtained) and
has paid all Taxes  required to have been paid by it,  except  where  failure to
file such Tax Returns or pay such Taxes would not, in the aggregate,  reasonably
be  expected  to have a Material  Adverse  Effect on AHP.  For  purposes of this
Agreement: (i) "Tax" (and, with correlative meaning, "Taxes") means any federal,
state, local or foreign income, gross receipts,  property,  sales, use, license,
excise,  franchise,  employment,  payroll,  withholding,  alternative  or add on
minimum,  ad valorem,  transfer or excise tax, or any other tax,  custom,  duty,
governmental  fee or other  like  assessment  or charge of any kind  whatsoever,
together with any interest or penalty, imposed by any governmental authority and
(ii) "Tax Return" means any return,  report or similar statement  required to be
filed with respect to any Tax  (including  any attached  schedules),  including,
without limitation,  any information return, claim for refund, amended return or
declaration of estimated Tax.

                  (p) Certain  Contracts.  As of the date hereof,  except as set
forth in the AHP SEC Reports filed prior to the date of this Agreement,  neither
AHP nor any of its  Subsidiaries  is a party to or  bound  by (i) any  "material
contract" (as such term is defined in Item  601(b)(10) of Regulation  S-K of the
SEC) or (ii) any non-competition agreement or any other agreement or arrangement
that limits or  otherwise  restricts  AHP or any of its  Subsidiaries  or any of
their respective  affiliates or any successor thereto,  or that would, after the
Effective  Time, to the Knowledge of AHP,  limit or restrict Newco or any of its
affiliates (including the Surviving  Corporation) or any successor thereto, from
engaging or competing in any line of business or in any geographic  area,  which
agreement or arrangement would reasonably be expected to have a Material Adverse
Effect on Newco and its  Subsidiaries  (including the Surviving  Corporation and
its Subsidiaries), taken together, after giving effect to the Merger.

                  (q)  Specified  Litigation.  As of the  date  hereof,  AHP has
provided to Monsanto  prior to the execution of this  Agreement all  information
Known to AHP which is relevant and material to an  assessment  of the  liability
exposure  of AHP  and  its  Subsidiaries  with  respect  to  litigation  matters
disclosed in the AHP SEC Reports or included on the AHP  Disclosure  Schedule 

                                       17
<PAGE>

as to  which  Monsanto  has  requested  such  information  (the  "AHP  Specified
Litigation Matters"). As of the date hereof, there is no information relating to
the AHP Specified  Litigation Matters in the possession of AHP, its Subsidiaries
or their counsel not heretofore  provided to Monsanto which would  reasonably be
expected to have a Material Adverse Effect on AHP.

                  3.2 Representations and Warranties of Monsanto.  Except as set
forth in the Monsanto  Disclosure Schedule delivered by Monsanto to AHP prior to
the execution of this  Agreement  (the  "Monsanto  Disclosure  Schedule")  (each
section of which  qualifies  the  correspondingly  numbered  representation  and
warranty or covenant to the extent specified  therein),  Monsanto represents and
warrants to AHP as follows:

                  (a) Organization, Standing and Power; Subsidiaries.

                          (i) Each of Monsanto and each of its Subsidiaries is a
                  corporation  duly  organized,  validly  existing  and in  good
                  standing under the laws of its  jurisdiction of  incorporation
                  or organization, has the requisite power and authority to own,
                  lease and operate its  properties and to carry on its business
                  as now being  conducted,  except  where the  failure  to be so
                  organized, existing and in good standing or to have such power
                  and  authority  would not  reasonably  be  expected  to have a
                  Material  Adverse Effect on Monsanto and is duly qualified and
                  in good standing to do business in each  jurisdiction in which
                  the nature of its business or the  ownership or leasing of its
                  properties  makes such  qualification  necessary other than in
                  such jurisdictions where the failure so to qualify or to be in
                  good  standing  would not  reasonably  be  expected  to have a
                  Material  Adverse  Effect  on  Monsanto.  The  copies  of  the
                  certificate  of  incorporation  and by-laws of Monsanto  which
                  were  previously  furnished or made available to AHP are true,
                  complete and correct  copies of such documents as in effect on
                  the date of this Agreement.

                          (ii) Exhibit 21 to  Monsanto's  Annual  Report on Form
                  10-K for the year ended  December  31, 1997  includes  all the
                  Subsidiaries  of  Monsanto  which  as  of  the  date  of  this
                  Agreement  are  Significant  Subsidiaries  (as defined in Rule
                  1-02 of Regulation S-X of the SEC). All the outstanding shares
                  of capital  stock of, or other equity  interests in, each such
                  Significant  Subsidiary have been validly issued and are fully
                  paid and nonassessable and are owned directly or indirectly by
                  Monsanto,  free and  clear of all  Liens and free of any other
                  restriction  (including any  restriction on the right to vote,
                  sell or  otherwise  dispose  of such  capital  stock  or other
                  ownership interests).  Except as set forth in the Monsanto SEC
                  Reports, neither Monsanto nor any of its Subsidiaries directly
                  or indirectly  owns any equity or similar  interest in, or any
                  interest  convertible into or exchangeable or exercisable for,
                  any corporation,  partnership, joint venture or other business
                  association or entity, that is or would reasonably be expected
                  to be  material to Monsanto  and its  Subsidiaries  taken as a
                  whole.

                                       18
<PAGE>

                  (b)  Capital Structure.

                          (i) As of May 15, 1998, the  authorized  capital stock
         of Monsanto  consisted of (A)  1,000,000,000  shares of Monsanto Common
         Stock,  of which  599,938,734  shares were  outstanding and 222,032,236
         shares were held in the treasury of Monsanto (of which  263,075  shares
         were held in the  treasury  pursuant  to the  Monsanto  Employee  Stock
         Purchase Plan) and (B) 10,000,000  shares of Preferred  Stock,  without
         par value,  none of which were  outstanding and 700,000 shares of which
         have been designated Series A Junior Participating  Preferred Stock and
         reserved  for  issuance  upon  exercise  of the rights  (the  "Rights")
         distributed  to the holders of Monsanto  Common  Stock  pursuant to the
         Rights  Agreement  dated as of January 26, 1990,  between  Monsanto and
         First National Bank of Boston, as Rights Agent, as amended (the "Rights
         Agreement").  Since May 15, 1998 to the date of this  Agreement,  there
         have been no  issuances  of shares of the capital  stock of Monsanto or
         any other  securities of Monsanto  other than  issuances of shares (and
         accompanying  Rights)  pursuant to options or rights  outstanding as of
         May 14, 1998 under the Benefit Plans of Monsanto or up to 50,000 shares
         of restricted  stock granted  under the Monsanto  Management  Incentive
         Plan of 1996,  as  amended.  All issued and  outstanding  shares of the
         capital stock of Monsanto are duly  authorized,  validly issued,  fully
         paid and  nonassessable,  and no class of capital  stock is entitled to
         preemptive  rights.  There  were  outstanding  as of May  26,  1998  no
         options,  warrants  or other  rights  to  acquire  capital  stock  from
         Monsanto other than (x) the Rights and (y) options  representing in the
         aggregate  the right to  purchase  no more than  108,484,911  shares of
         Monsanto  Common Stock  (collectively,  the "Monsanto  Stock  Options")
         under the  Monsanto  Company  Non-Employee  Director  Equity  Incentive
         Compensation  Plan,  Monsanto  Management  Incentive  Plan of 1984, the
         Searle  Monsanto  Stock Option Plan of 1986,  the  Monsanto  Management
         Incentive Plan of 1988/II,  the Monsanto  Management  Incentive Plan of
         1988/I,  the  NutraSweet/Monsanto  Stock  Plan of  1991,  the  Monsanto
         Management  Incentive Plan of 1994, the  Searle/Monsanto  Stock Plan of
         1994,  the  NutraSweet/Monsanto  Stock Plan of 1994,  and the  Monsanto
         Management  Incentive  Plan of 1996, as each such plan has been amended
         (collectively,  the "Monsanto Stock Option  Plans").  Section 3.2(b) of
         the  Monsanto  Disclosure  Schedule  sets forth a complete  and correct
         list,  as of May 26, 1998,  of the number of shares of Monsanto  Common
         Stock subject to Monsanto  Stock Options or other rights to purchase or
         receive  Monsanto Common Stock granted under the Monsanto Benefit Plans
         or otherwise,  the dates of grant and the exercise prices  thereof.  No
         options  or  warrants  or other  rights to acquire  capital  stock from
         Monsanto  have been issued or granted since May 26, 1998 to the date of
         this Agreement.

                          (ii) No bonds, debentures, notes or other indebtedness
         of  Monsanto  having  the  right  to  vote  on  any  matters  on  which
         stockholders   may  vote   ("Monsanto   Voting  Debt")  are  issued  or
         outstanding.

                          (iii)  Except as  otherwise  set forth in this Section
         3.2(b),  as of the date of this  Agreement,  there  are no  securities,
         options, warrants, calls, rights, commitments, 

                                       19
<PAGE>

         agreements,  arrangements or undertakings of any kind to which Monsanto
         or any of its  Subsidiaries is a party or by which any of them is bound
         obligating  Monsanto or any of its  Subsidiaries  to issue,  deliver or
         sell, or cause to be issued,  delivered or sold,  additional  shares of
         capital  stock or other  voting  securities  of  Monsanto or any of its
         Subsidiaries  or  obligating  Monsanto  or any of its  Subsidiaries  to
         issue, grant, extend or enter into any such security,  option, warrant,
         call, right, commitment,  agreement,  arrangement or undertaking. As of
         the date of this  Agreement,  there are no  outstanding  obligations of
         Monsanto,  any of its Subsidiaries or to the knowledge of Monsanto, any
         of its Majority  Owned  Affiliates to  repurchase,  redeem or otherwise
         acquire  any  shares  of  capital   stock  of  Monsanto,   any  of  its
         Subsidiaries  or, to the  knowledge  of  Monsanto,  any of its Majority
         Owned Affiliates.

                  (c) Authority; No Conflicts.

                          (i) Monsanto  has all  requisite  corporate  power and
         authority  to  enter  into  this   Agreement  and  to  consummate   the
         transactions   contemplated   hereby,   subject  in  the  case  of  the
         consummation  of the Merger to the  adoption of this  Agreement  by the
         Required  Monsanto Vote (as defined in Section  3.2(g)).  The execution
         and delivery of this Agreement and the consummation of the transactions
         contemplated   hereby  have  been  duly  authorized  by  all  necessary
         corporate  action on the part of  Monsanto,  subject in the case of the
         consummation  of the Merger to the  adoption of this  Agreement  by the
         Required  Monsanto  Vote.  This  Agreement  has been duly  executed and
         delivered by Monsanto and constitutes a valid and binding  agreement of
         Monsanto,  enforceable  against it in accordance with its terms, except
         as  such  enforceability  may be  limited  by  bankruptcy,  insolvency,
         reorganization,  moratorium  and similar laws  relating to or affecting
         creditors  generally,  by  general  equity  principles  (regardless  of
         whether such  enforceability is considered in a proceeding in equity or
         at law).

                          (ii) The execution  and delivery of this  Agreement by
         Monsanto does not or will not, as the case may be, and the consummation
         by  Monsanto  of the  Merger  and the other  transactions  contemplated
         hereby will not,  conflict with, or result in a Violation  pursuant to:
         (A) any provision of the  certificate  of  incorporation  or by-laws of
         Monsanto,  any material  Subsidiary of Monsanto or, to the knowledge of
         Monsanto,  any of its Majority Owned  Affiliates or (B) except as would
         not  reasonably  be  expected  to have a  Material  Adverse  Effect  on
         Monsanto or, to the knowledge of Monsanto,  Newco following the Merger,
         subject  to  obtaining  or  making  the  consents,  approvals,  orders,
         authorizations,  registrations, declarations and filings referred to in
         paragraph (iii) below, any loan or credit  agreement,  note,  mortgage,
         bond,  indenture,  lease, benefit plan or other agreement,  obligation,
         instrument,  permit, concession,  franchise,  license, judgment, order,
         decree,  statute,  law,  ordinance,  rule or  regulation  applicable to
         Monsanto,  any Subsidiary of Monsanto or, to the knowledge of Monsanto,
         any of its Majority Owned Affiliates or their respective  properties or
         assets.

                                       20
<PAGE>

                          (iii) No consent, approval, order or authorization of,
         or registration, declaration or filing with, any Governmental Entity is
         required by or with respect to Monsanto or any  Subsidiary  of Monsanto
         in  connection  with the  execution  and delivery of this  Agreement by
         Monsanto or the  consummation of the Merger and the other  transactions
         contemplated  hereby,  except the Necessary Consents and such consents,
         approvals,  orders,  authorizations,  registrations,  declarations  and
         filings the failure of which to make or obtain would not  reasonably be
         expected to have a Material Adverse Effect on Monsanto.

                  (d) Reports and Financial Statements.

                          (i)  Monsanto  has  filed  all  required  registration
         statements,  prospectuses,  reports,  schedules,  forms, statements and
         other  documents  required to be filed by it with the SEC since January
         1, 1997  (collectively,  including all exhibits thereto,  the "Monsanto
         SEC Reports").  No Subsidiary of Monsanto is required to file any form,
         report, registration statement or prospectus or other document with the
         SEC.  None of the Monsanto SEC Reports,  as of their  respective  dates
         (and,  if amended or  superseded  by a filing prior to the date of this
         Agreement  or the  Closing  Date,  then on the  date  of such  filing),
         contained  or will contain any untrue  statement of a material  fact or
         omitted or will omit to state a  material  fact  required  to be stated
         therein or necessary to make the  statements  therein,  in light of the
         circumstances under which they were made, not misleading.  The Monsanto
         SEC Reports together with any public  announcements in a Dow Jones News
         Release made by Monsanto after the date hereof, taken as a whole, as of
         the Effective Time will not contain any untrue  statement of a material
         fact or omit to state a material fact required to be stated  therein or
         necessary to make the statements therein, in light of the circumstances
         existing  as of  the  Effective  Time,  not  misleading.  Each  of  the
         financial  statements  (including  the related  notes)  included in the
         Monsanto SEC Reports presents  fairly,  in all material  respects,  the
         consolidated  financial position and consolidated results of operations
         and cash flows of Monsanto and its  Subsidiaries  as of the  respective
         dates  or  for  the  respective  periods  set  forth  therein,  all  in
         conformity with GAAP  consistently  applied during the periods involved
         except as otherwise  noted  therein,  and  subject,  in the case of the
         unaudited  interim  financial  statements,   to  normal  and  recurring
         year-end  adjustments  that  have not been and are not  expected  to be
         material  in amount.  All of such  Monsanto  SEC  Reports,  as of their
         respective dates (and as of the date of any amendment to the respective
         Monsanto SEC Report), complied as to form in all material respects with
         the applicable  requirements of the Securities Act and the Exchange Act
         and the rules and regulations promulgated thereunder.

                          (ii) Except as  disclosed  in the Monsanto SEC Reports
         filed prior to the date hereof,  since December 31, 1997,  Monsanto and
         its Subsidiaries have not incurred any liabilities that are of a nature
         that would be required to be disclosed  on a balance  sheet of Monsanto
         and its  Subsidiaries or the footnotes  thereto  prepared in conformity
         with GAAP,  other than (A) liabilities  incurred in the ordinary course
         of business or (B) 

                                       21
<PAGE>

         liabilities  that would not,  either  individually or in the aggregate,
         reasonably be expected to have a Material Adverse Effect on Monsanto.

                  (e) Information Supplied.

                          (i) None of the information supplied or to be supplied
         by Monsanto for inclusion or incorporation by reference in (A) the Form
         S-4 will,  at the time the Form S-4 is filed with the SEC,  at any time
         it is amended or supplemented or at the time it becomes effective under
         the Securities Act,  contain any untrue statement of a material fact or
         omit to state  any  material  fact  required  to be stated  therein  or
         necessary to make the statements  therein not  misleading,  and (B) the
         Joint Proxy  Statement/Prospectus  will, on the date it is first mailed
         to  Monsanto  stockholders  or AHP  stockholders  or at the time of the
         Monsanto Stockholders Meeting or the AHP Stockholders Meeting,  contain
         any untrue  statement of a material  fact or omit to state any 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.   The   Form   S-4   and  the   Joint   Proxy
         Statement/Prospectus  will comply as to form in all  material  respects
         with the  requirements  of the Exchange Act and the  Securities Act and
         the rules and regulations of the SEC thereunder.

                          (ii)  Notwithstanding the foregoing provisions of this
         Section 3.2(e),  no representation or warranty is made by Monsanto with
         respect to statements made or incorporated by reference in the Form S-4
         or the Joint Proxy  Statement/Prospectus  based on information supplied
         by AHP or  Merger  Sub for  inclusion  or  incorporation  by  reference
         therein.

                  (f) Board  Approval.  The Board of Directors  of Monsanto,  by
resolutions  duly  adopted by  unanimous  vote of those voting at a meeting duly
called  and held and not  subsequently  rescinded  or  modified  in any way (the
"Monsanto Board Approval"),  has duly (i) determined that this Agreement and the
Merger are fair to and in the best  interests of Monsanto and its  stockholders,
(ii)  approved  this  Agreement  and the Merger and (iii)  recommended  that the
stockholders  of  Monsanto  adopt  this  Agreement  and  approve  the Merger and
directed  that  this  Agreement  and the  transactions  contemplated  hereby  be
submitted  for   consideration  by  Monsanto's   stockholders  at  the  Monsanto
Stockholders  Meeting.  The Monsanto Board Approval constitutes approval of this
Agreement  and the  Merger  for  purposes  of  Section  203 of the DGCL.  To the
knowledge  of  Monsanto,  except  for  Section  203 of the DGCL  (which has been
rendered inapplicable), no state takeover statute is applicable to the Merger or
the other transactions contemplated hereby.

                  (g) Vote Required.  The  affirmative  vote of the holders of a
majority  of the  outstanding  shares of  Monsanto  Common  Stock to approve the
Merger  (the  "Required  Monsanto  Vote") is the only vote of the holders of any
class or series of Monsanto  capital stock necessary to adopt this Agreement and
approve the Merger and the other transactions contemplated hereby 

                                       22
<PAGE>

(assuming that AHP is not an "interested  stockholder" of Monsanto under Section
203  of  the  DGCL  immediately  before  the  execution  and  delivery  of  this
Agreement).

                  (h) Litigation; Compliance with Laws.

                          (i) Except as  disclosed  in the  Monsanto SEC Reports
         filed prior to the date of this Agreement,  there is no suit, action or
         proceeding  pending  or,  to the  knowledge  of  Monsanto,  threatened,
         against or affecting  Monsanto or any Subsidiary of Monsanto having, or
         which would reasonably be expected to have a Material Adverse Effect on
         Monsanto, nor is there any judgment, decree, injunction,  rule or order
         of any Governmental  Entity or arbitrator  outstanding against Monsanto
         or any  Subsidiary of Monsanto  having,  or which  reasonably  would be
         expected to have a Material Adverse Effect on Monsanto.

                          (ii) Except as  disclosed  in the Monsanto SEC Reports
         filed  prior to the  date of the  Agreement  and  except  as would  not
         reasonably be expected to have a Material  Adverse  Effect on Monsanto,
         Monsanto and its Subsidiaries  hold all permits,  licenses,  variances,
         exemptions, orders and approvals of all Governmental Entities necessary
         for the operation of the  businesses of Monsanto and its  Subsidiaries,
         taken  as  a  whole  (the   "Monsanto   Permits").   Monsanto  and  its
         Subsidiaries are in compliance with the terms of the Monsanto  Permits,
         except where the failure so to comply would not  reasonably be expected
         to have a Material  Adverse Effect on Monsanto.  Except as disclosed in
         the Monsanto SEC Reports filed prior to the date of this Agreement, the
         businesses of Monsanto and its  Subsidiaries are not being conducted in
         violation  of, and Monsanto has not received any notices of  violations
         with respect to, any law,  ordinance or regulation of any  Governmental
         Entity,  except for possible  violations  which would not reasonably be
         expected to have a Material Adverse Effect on Monsanto.

                  (i)  Absence  of  Certain   Changes  or  Events.   Except  for
liabilities  incurred in  connection  with this  Agreement  or the  transactions
contemplated hereby, except as disclosed in the Monsanto SEC Reports filed prior
to the date of this  Agreement,  and except as permitted  by Section 4.2,  since
December 31, 1997,  Monsanto and its Subsidiaries  have conducted their business
only in the ordinary course and there has not been (i) any change,  circumstance
or event which has had,  or would  reasonably  be  expected to have,  a Material
Adverse  Effect on Monsanto  or (ii) any action  taken by Monsanto or any of its
Subsidiaries  during the period from  December 31, 1997 through the date of this
Agreement  that,  if taken  during  the period  from the date of this  Agreement
through the Effective Time, would constitute a breach of Section 4.2.

                  (j) Environmental  Matters.  Except as would not reasonably be
expected to have a Material  Adverse  Effect on Monsanto and except as disclosed
in the Monsanto SEC Reports filed prior to the date of this  Agreement,  (i) the
operations of Monsanto and its Subsidiaries have been and are in compliance with
all Environmental Laws and with all licenses required by Environmental Laws (ii)
there are no pending or, to the knowledge of Monsanto, threatened, Actions under
or pursuant to  Environmental  Laws  against  Monsanto  or its  

                                       23
<PAGE>

Subsidiaries  or involving any real  property  currently or, to the knowledge of
Monsanto,  formerly owned,  operated or leased by Monsanto or its  Subsidiaries,
(iii)  Monsanto  and its  Subsidiaries  are  not  subject  to any  Environmental
Liabilities  and, to the  knowledge  of  Monsanto,  no facts,  circumstances  or
conditions  relating to, arising from,  associated  with or  attributable to any
real  property  currently  or, to the  knowledge  of Monsanto,  formerly  owned,
operated or leased by Monsanto or its  Subsidiaries or operations  thereon would
reasonably  be expected to result in  Environmental  Liabilities,  (iv) all real
property  owned and to the knowledge of Monsanto all real  property  operated or
leased by Monsanto or its Subsidiaries is free of  contamination  from Hazardous
Material  that would have an adverse  effect on human health or the  environment
and (v) there is not now, nor, to the  knowledge of Monsanto,  has there been in
the past,  on, in or under  any real  property  owned,  leased  or  operated  by
Monsanto or any of its predecessors (a) any underground storage tanks, regulated
pursuant  to  40  C.F.R.  Part  280  or  delegated  state  programs,   dikes  or
impoundments  containing more than a reportable quantity of Hazardous Materials,
(b)  any  friable  asbestos-containing  materials  or  (c)  any  polychlorinated
biphenyls.

                  (k) Intellectual  Property.  Except as would not reasonably be
expected to have a Material  Adverse  Effect on Monsanto and except as disclosed
in the  Monsanto  SEC  Reports  filed prior to the date of this  Agreement,  (a)
Monsanto and each of its Subsidiaries owns, or is licensed to use (in each case,
free and clear of any liens), all Intellectual Property used in or necessary for
the  conduct  of  its  business  as  currently  conducted;  (b)  the  use of any
Intellectual  Property by Monsanto and its Subsidiaries  does not infringe on or
otherwise  violate  the  rights  of any  Person  and is in  accordance  with any
applicable  license  pursuant to which Monsanto or any  Subsidiary  acquired the
right to use any  Intellectual  Property;  (c) to the knowledge of Monsanto,  no
Person  is  challenging,  infringing  on or  otherwise  violating  any  right of
Monsanto or any of its Subsidiaries  with respect to any  Intellectual  Property
owned by and/or  licensed  to  Monsanto  or its  Subsidiaries;  and (d)  neither
Monsanto nor any of its  Subsidiaries  has  received  any written  notice of any
pending claim with respect to any Intellectual Property used by Monsanto and its
Subsidiaries and to its knowledge no Intellectual Property owned and/or licensed
by Monsanto or its Subsidiaries is being used or enforced in a manner that would
result in the abandonment, cancellation or unenforceability of such Intellectual
Property.

                  (l) Rights  Agreement.  The Board of Directors of Monsanto has
approved an  amendment  to the Rights  Agreement to the effect that none of AHP,
Merger Sub or any of their  respective  affiliates  shall  become an  "Acquiring
Person",  and that no "Share  Acquisition Date" or "Distribution  Date" (as such
terms are defined in the Rights Agreement) will occur by reason of the approval,
execution or delivery of this Agreement or the  consummation of the transactions
contemplated hereby.

                  (m) Brokers and Finders. No agent, broker,  investment banker,
financial advisor or other firm or Person is or will be entitled to any broker's
or finder's fee or any other similar commission or fee in connection with any of
the transactions contemplated by this Agreement, based upon arrangements made by
or on behalf of Monsanto except Goldman,  Sachs & Co. and BancAmerica  Robertson
Stephens (the "Monsanto  Financial  Advisors"),  whose fees and expenses 

                                       24
<PAGE>

will be paid by Monsanto in  accordance  with  Monsanto's  agreements  with such
firms, copies of which have been provided to AHP.

                  (n)  Opinions of Monsanto  Financial  Advisors.  Monsanto  has
received the opinion of the Monsanto Financial Advisors,  dated the date of this
Agreement, to the effect that, as of such date, the Exchange Ratio is fair, from
a financial  point of view, to the holders of Monsanto  Common Stock,  copies of
which opinions have been made available to AHP.

                  (o) Accounting Matters. To the knowledge of Monsanto,  neither
Monsanto nor any of its  affiliates  has taken or agreed to take any action that
would prevent AHP from accounting for the Merger as a "pooling of interests". At
or prior to the date hereof, Monsanto has received a letter from its independent
public  accountants  addressed  to  Monsanto,  with a  copy  to  AHP  and  AHP's
independent  public  accountants,  stating  that  they  concur  with  Monsanto's
conclusion that, as of the date of their report,  no conditions exist that would
preclude  Monsanto's  ability  to be a party  in a  business  combination  to be
accounted for as a pooling of interests.

                  (p) Taxes. Each of Monsanto and its Subsidiaries has filed all
Tax Returns  required to have been filed (or extensions have been duly obtained)
and has paid all Taxes required to have been paid by it, except where failure to
file such Tax Returns or pay such Taxes would not, in the aggregate,  reasonably
be expected to have a Material Adverse Effect on Monsanto. Monsanto has provided
AHP with a true and correct copy of the ruling  issued by the  Internal  Revenue
Service in  connection  with the spin-off of Solutia,  Inc.  and, to  Monsanto's
knowledge,  the  representations  and  warranties of Monsanto  contained in such
ruling were true and correct in all material respects as of the time made.

                  (q) Certain  Contracts. As of the date  hereof,  except as set
forth in the  Monsanto  SEC Reports  filed prior to the date of this  Agreement,
neither  Monsanto nor any of its  Subsidiaries is a party to or bound by (i) any
"material  contract"  (as such term is defined in Item  601(b)(10) of Regulation
S-K of the SEC) or (ii) any non-competition  agreement or any other agreement or
arrangement  that  limits  or  otherwise   restricts  Monsanto  or  any  of  its
Subsidiaries or any of their respective  affiliates or any successor  thereto or
that would,  after the Effective  Time,  to the Knowledge of Monsanto,  limit or
restrict Newco or any of its affiliates (including the Surviving Corporation) or
any successor thereto,  from engaging or competing in any line of business or in
any geographic area, which agreement or arrangement would reasonably be expected
to have a Material Adverse Effect on Newco and its  Subsidiaries  (including the
Surviving Corporation and its Subsidiaries), taken together, after giving effect
to the Merger.

                  (r) Specified Litigation.  As of the date hereof, Monsanto has
provided to AHP prior to the execution of this Agreement all  information  Known
to Monsanto  which is relevant and material to an  assessment  of the  liability
exposure of Monsanto and its  Subsidiaries  with respect to  litigation  matters
disclosed in the  Monsanto  SEC Reports or included on the  Monsanto  Disclosure
Schedule as to which AHP has requested such information (the "Monsanto Specified
Litigation Matters"). As of the date hereof, there is no information relating to
the Monsanto  

                                       25
<PAGE>

Specified Litigation Matters in the possession of Monsanto,  its Subsidiaries or
their counsel not heretofore  provided to AHP which would reasonably be expected
to have a Material Adverse Effect on Monsanto.

                  3.3  Representations and Warranties of AHP and Merger Sub. AHP
and Merger Sub represent and warrant to Monsanto as follows: 

                  (a)   Organization.   Merger   Sub  is  a   corporation   duly
incorporated,  validly existing and in good standing under the laws of Delaware.
Merger Sub is a direct wholly-owned subsidiary of AHP.

                  (b)  Corprorate  Authorization.  Merger Sub has all  requisite
corporate power and authority to enter into this Agreement and to consummate the
transactions  contemplated  hereby.  The execution,  delivery and performance by
Merger  Sub  of  this  Agreement  and  the  consummation  by  Merger  Sub of the
transactions  contemplated  hereby have been duly  authorized  by all  necessary
corporate  action  on the part of  Merger  Sub.  This  Agreement  has been  duly
executed  and  delivered  by Merger  Sub and  constitutes  a valid  and  binding
agreement of Merger Sub,  enforceable  against it in accordance  with its terms,
except  as  such  enforceability  may  be  limited  by  bankruptcy,  insolvency,
reorganization,  moratorium  and other  similar  laws  relating to or  affecting
creditors  generally,  by general equity principles  (regardless of whether such
enforceability  is  considered  in a  proceeding  in  equity or at law) or by an
implied covenant of good faith and fair dealing.

                  (c) Non-Contravantion. The execution, delivery and performance
by Merger  Sub of this  Agreement  and the  consummation  by  Merger  Sub of the
transactions contemplated hereby do not and will not contravene or conflict with
the certificate of incorporation or by-laws of Merger Sub.

                  (d) No Business  Activities.  Merger Sub has not conducted any
activities  other than in connection  with the  organization  of Merger Sub, the
negotiation  and  execution  of  this  Agreement  and  the  consummation  of the
transactions contemplated hereby. Merger Sub has no Subsidiaries.


                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

                  4.1 Covenants of AHP.  During the period from the date of this
Agreement and continuing  until the Effective  Time, AHP agrees as to itself and
its  Subsidiaries  that (except as expressly  contemplated  or permitted by this
Agreement or the AHP Disclosure Schedule or as required by a Governmental Entity
of competent jurisdiction or to the extent that Monsanto shall otherwise consent
in writing, which consent shall not be unreasonably withheld or delayed):

                                       26
<PAGE>

                  (a) Ordinary Course.

                          (i) AHP and its  Subsidiaries  shall  carry  on  their
         respective  businesses in the usual, regular and ordinary course in all
         material  respects,  in  substantially  the same  manner as  heretofore
         conducted,  and shall use all  reasonable  efforts to  preserve  intact
         their present lines of business,  maintain  their rights and franchises
         and preserve their  relationships with customers,  suppliers and others
         having  business  dealings  with  them to the end  that  their  ongoing
         businesses  shall  not be  impaired  in  any  material  respect  at the
         Effective  Time;  provided,  however,  that  no  action  by  AHP or its
         Subsidiaries  with  respect to matters  specifically  addressed  by any
         other  provision  of this  Section 4.1 shall be deemed a breach of this
         Section  4.1(a)(i)  unless such action would constitute a breach of one
         or more of such other provisions.

                          (ii)  Other  than  in  connection  with   acquisitions
         permitted by Section 4.1(e), AHP shall not, and shall not permit any of
         its  Subsidiaries  to, (A) enter into any new material line of business
         or (B) incur or commit to any capital  expenditures  or any obligations
         or liabilities in connection  therewith other than capital expenditures
         and  obligations  or liabilities  in connection  therewith  incurred or
         committed to in the ordinary  course of business  consistent  with past
         practice and which,  together  with all such  expenditures  incurred or
         committed  since January 1, 1998,  are not in excess of the amounts set
         forth in Section 4.1(a) of the AHP Disclosure Schedule.

                  (b) Dividends;  Changes in Share  Capital.  AHP shall not, and
shall not  permit any of its  Subsidiaries  to,  and shall not  propose  to, (i)
declare or pay any dividends on or make other distributions in respect of any of
its capital stock,  except (A) the declaration and payment of regular  quarterly
cash  dividends  not in excess of $.215 per share of AHP Common Stock with usual
record and payment  dates for such  dividends in  accordance  with past dividend
practice,  (B) the declaration  and payment of regular  quarterly cash dividends
not in excess of $.50 per share on the $2 Convertible Preferred Stock with usual
record and payment  dates for such  dividends in  accordance  with past dividend
practice and (C) for dividends by wholly owned  Subsidiaries of AHP, (ii) split,
combine or reclassify  any of its capital stock or issue or authorize or propose
the  issuance  of  any  other  securities  in  respect  of,  in  lieu  of  or in
substitution  for, shares of its capital stock,  except for any such transaction
by a wholly owned  Subsidiary  of AHP which  remains a wholly  owned  Subsidiary
after consummation of such transaction or (iii) repurchase,  redeem or otherwise
acquire any shares of its capital stock or any  securities  convertible  into or
exercisable  for any shares of its capital  stock except for the  purchase  from
time to time by AHP of AHP  Common  Stock in the  ordinary  course  of  business
consistent with past practice in connection with the AHP Benefit Plans.

                  (c)  Issuance  of  Securities.  AHP shall  not,  and shall not
permit any of its  Subsidiaries  to,  issue,  deliver or sell,  or  authorize or
propose the  issuance,  delivery or sale of, any shares of its capital  stock of
any class, any AHP Voting Debt or any securities convertible into or exercisable
for,  or any  rights,  warrants  or options to  acquire,  any such shares or AHP
Voting Debt, or enter into any agreement  with respect to any of the  foregoing,
other than (i) the  

                                       27
<PAGE>

issuance  of AHP  Common  Stock  upon the  exercise  of AHP Stock  Options or in
connection with other stock-based  benefit plans outstanding on the date hereof,
in each case in accordance  with their present  terms,  (ii) the granting of AHP
Stock Options in the ordinary  course of business  consistent with past practice
not in excess of the amounts set forth in Section  4.1(c) of the AHP  Disclosure
Schedule,  (iii) issuances by a wholly owned  Subsidiary of AHP of capital stock
to such  Subsidiary's  parent or another wholly owned  Subsidiary of AHP or (iv)
pursuant  to  acquisitions  set  forth  on the AHP  Disclosure  Schedule  or the
financings therefor.

                  (d)  Governing  Documents.  Except to the extent  required  to
comply with their respective obligations hereunder,  required by law or required
by the rules and  regulations of the NYSE, AHP and Merger Sub shall not amend or
propose to so amend their respective  certificates of incorporation,  by-laws or
other governing  documents,  except that Merger Sub may amend its certificate of
incorporation to increase the number of authorized shares of its common stock.

                  (e) No Acquisitions.  Other than (i) acquisitions disclosed on
the AHP  Disclosure  Schedule  and (ii)  acquisitions  for cash in  existing  or
related   lines  of  business  of  AHP  the  fair  market  value  of  the  total
consideration  (including  the value of  indebtedness  acquired or assumed)  for
which  does not  exceed  the  amount  specified  in the  aggregate  for all such
acquisitions  in Section 4.1(e) of the AHP Disclosure  Schedule,  AHP shall not,
and shall not permit any of its  Subsidiaries to, acquire or agree to acquire by
merging or consolidating with, or by purchasing a substantial equity interest in
or a substantial  portion of the assets of, or by any other manner, any business
or any corporation,  partnership,  association or other business organization or
division thereof or otherwise acquire or agree to acquire any assets (other than
the  acquisition of assets used in the operations of the business of AHP and its
Subsidiaries  in the ordinary  course);  provided,  however,  that the foregoing
shall not prohibit  (x) internal  reorganizations  or  consolidations  involving
existing  Subsidiaries  of AHP or (y) the  creation of new  Subsidiaries  of AHP
organized  to  conduct  or  continue  activities  otherwise  permitted  by  this
Agreement.

                  (f) No Dispositions.  Other than (i) internal  reorganizations
or  consolidations  involving  existing  Subsidiaries of AHP, (ii)  dispositions
referred to in AHP SEC  Reports  filed  prior to the date of this  Agreement  or
(iii) as may be required by or in conformance with law or regulation in order to
permit or facilitate the consummation of the transactions contemplated hereby or
the transactions  disclosed in the AHP Disclosure  Schedule,  AHP shall not, and
shall not permit any of its Subsidiaries to, sell, lease,  encumber or otherwise
dispose of, or agree to sell,  lease,  encumber or otherwise  dispose of, any of
its  assets  (including  capital  stock  of  Subsidiaries  of AHP but  excluding
inventory in the ordinary course of business) the fair market value of the total
consideration  (including the value of the indebtedness acquired or assumed) for
which  does not  exceed  the  amount  specified  in the  aggregate  for all such
dispositions in Section 4.1(f) of the AHP Disclosure Schedule.

                  (g)  Investments;  Indebtedness.  AHP shall not, and shall not
permit  any of its  Subsidiaries  to,  other  than in  connection  with  actions
permitted  by  Section  4.1(e),   (i)  make  any  loans,   advances  or  capital
contributions to, or investments in, any other Person,  other than (x) by 

                                       28
<PAGE>

AHP or a Subsidiary  of AHP to or in AHP or any  Subsidiary of AHP, (y) pursuant
to any  contract or other  legal  obligation  of AHP or any of its  Subsidiaries
existing at the date of this Agreement or (z) in the ordinary course of business
consistent  with  past  practice  in an  aggregate  amount  not in excess of the
aggregate amount  specified in Section 4.1(g) of the AHP Disclosure  Schedule or
(ii) create,  incur,  assume or suffer to exist any  indebtedness,  issuances of
debt securities,  guarantees,  loans or advances not in existence as of the date
of this Agreement except pursuant to the credit facilities, indentures and other
arrangements  in  existence  on the date of this  Agreement  or in the  ordinary
course of business  consistent  with past practice,  in each case as such credit
facilities,   indentures  and  other  arrangements  may  be  amended,  extended,
modified, refunded, renewed or refinanced after the date of this Agreement.

                  (h)  Pooling;  Tax-Free  Qualification.   AHP  shall  use  its
reasonable best efforts not to, and shall use its reasonable best efforts not to
permit  any of its  Subsidiaries  to,  take any  action  (including  any  action
otherwise permitted by this Section 4.1) that would prevent or impede the Merger
from  qualifying as a "pooling of  interests"  for  accounting  purposes or as a
"reorganization" under Section 368 of the Code.

                  (i) Compensation. Other than as contemplated by Section 5.6 or
by  Section  4.1(c)  or  4.1(i) of the AHP  Disclosure  Schedule,  AHP shall not
increase the amount of compensation of any director or executive  officer except
in the ordinary course of business  consistent with past practice or as required
by an existing  agreement,  make any increase in or  commitment  to increase any
employee  benefits,  issue any additional  AHP Stock Options,  adopt or make any
commitment  to  adopt  any  additional   employee   benefit  plan  or  make  any
contribution,  other than regularly scheduled contributions,  to any AHP Benefit
Plan.

                  (j)  Accounting  Methods;  Income  Tax  Elections.  Except  as
disclosed in AHP SEC Reports  filed prior to the date of this  Agreement,  or as
required  by a  Governmental  Entity,  AHP  shall  not  change  its  methods  of
accounting in effect at December 31, 1997, except as required by changes in GAAP
as  concurred  in by AHP's  independent  public  accountants.  AHP shall not (i)
change its fiscal year or (ii) make any material tax election, other than in the
ordinary course of business consistent with past practice.

                  (k) Certain  Agreements.  AHP shall not,  and shall not permit
any of its  Subsidiaries to, enter into any agreement or arrangement that limits
or otherwise restricts AHP or any of its Subsidiaries or any of their respective
affiliates or any  successor  thereto or that could,  after the Effective  Time,
limit  or  restrict  Newco or any of its  affiliates  (including  the  Surviving
Corporation) or any successor thereto, from engaging or competing in any line of
business  or in  any  geographic  area  which  agreement  or  arrangement  would
reasonably  be  expected  to have a  Material  Adverse  Effect  on Newco and its
Subsidiaries  (including the Surviving Corporation and its Subsidiaries),  taken
together, after giving effect to the Merger.

                  4.2 Covenants of Monsanto.  During the period from the date of
this Agreement and continuing  until the Effective  Time,  Monsanto agrees as to
itself and its Subsidiaries that (except as expressly  contemplated or permitted
by this  Agreement  or the  Monsanto  Disclosure  

                                       29
<PAGE>

Schedule or as required by a Governmental Entity of competent jurisdiction or to
the extent that AHP shall otherwise consent in writing,  which consent shall not
be unreasonably withheld or delayed):
                  (a) Ordinary Course.

                          (i) Monsanto and its Subsidiaries shall carry on their
         respective  businesses in the usual, regular and ordinary course in all
         material  respects,  in  substantially  the same  manner as  heretofore
         conducted,  and shall use all  reasonable  efforts to  preserve  intact
         their present lines of business,  maintain  their rights and franchises
         and preserve their  relationships with customers,  suppliers and others
         having  business  dealings  with  them to the end  that  their  ongoing
         businesses  shall  not be  impaired  in  any  material  respect  at the
         Effective Time;  provided,  however,  that no action by Monsanto or its
         Subsidiaries  with  respect to matters  specifically  addressed  by any
         other  provision  of this  Section 4.2 shall be deemed a breach of this
         Section  4.2(a)(i)  unless such action would constitute a breach of one
         or more of such other provisions.

                          (ii)  Other  than  in  connection  with   acquisitions
         permitted by Section  4.2(e),  Monsanto shall not, and shall not permit
         any of its  Subsidiaries  to, (A) enter into any new  material  line of
         business  or (B)  incur or commit to any  capital  expenditures  or any
         obligations or liabilities in connection  therewith  other than capital
         expenditures  and  obligations or  liabilities in connection  therewith
         incurred or committed to in the ordinary course of business  consistent
         with past  practice  and  which,  together  with all such  expenditures
         incurred or committed  since January 1, 1998,  are not in excess of the
         amounts  set  forth  in  Section  4.2(a)  of  the  Monsanto  Disclosure
         Schedule.

                  (b) Dividends;  Changes in Share Capital.  Monsanto shall not,
and shall not permit any of its  Subsidiaries  to, and shall not propose to, (i)
declare or pay any dividends on or make other distributions in respect of any of
its capital stock,  except (A) the declaration and payment of regular  quarterly
cash  dividends  not in excess of $.03 per share of Monsanto  Common  Stock with
usual  record and  payment  dates for such  dividends  in  accordance  with past
dividend  practice  and  (B) for  dividends  by  wholly  owned  Subsidiaries  of
Monsanto, (ii) split, combine or reclassify any of its capital stock or issue or
authorize or propose the issuance of any other securities in respect of, in lieu
of or in  substitution  for,  shares of its capital  stock,  except for any such
transaction  by a wholly owned  Subsidiary  of Monsanto  which  remains a wholly
owned Subsidiary after  consummation of such  transaction,  or (iii) repurchase,
redeem or otherwise  acquire any shares of its capital  stock or any  securities
convertible  into or exercisable  for any shares of its capital stock except for
the  purchase  from time to time by Monsanto of Monsanto  Common  Stock (and the
associated  Rights) in the  ordinary  course of  business  consistent  with past
practice in  connection  with the Monsanto  Benefit  Plans.  Monsanto  shall not
redeem the Monsanto Rights.

                  (c) Issuance of Securities.  Monsanto shall not, and shall not
permit any of its  Subsidiaries  to,  issue,  deliver or sell,  or  authorize or
propose the  issuance,  delivery or sale of, 


                                      30
<PAGE>

any shares of its capital  stock of any class,  any Monsanto  Voting Debt or any
securities  convertible  into or  exercisable  for, or any  rights,  warrants or
options to acquire,  any such shares or Monsanto  Voting Debt, or enter into any
agreement with respect to any of the  foregoing,  other than (i) the issuance of
Monsanto Common Stock (and the associated  Rights) upon the exercise of Monsanto
Stock Options or in connection with other stock-based benefits plans outstanding
on the date hereof,  in each case in accordance  with their present terms,  (ii)
issuances  by a wholly  owned  Subsidiary  of Monsanto of capital  stock to such
Subsidiary's  parent or another wholly owned  subsidiary of Monsanto,  (iii) the
granting of Monsanto Stock Options in the ordinary course of business consistent
with past  practice not in excess of the amounts set forth in Section  4.2(c) of
the Monsanto Disclosure Schedule, (iv) pursuant to acquisitions set forth on the
Monsanto  Disclosure  Schedule or the  financings  therefor or (v)  issuances in
accordance with the Rights Agreement.

                  (d)  Governing  Documents.  Except to the extent  required  to
comply with their respective obligations hereunder,  required by law or required
by the rules and regulations of the NYSE, Monsanto shall not amend or propose to
so amend  their  respective  certificates  of  incorporation,  by-laws  or other
governing documents.

                  (e) No Acquisitions.  Other than (i) acquisitions disclosed on
the Monsanto  Disclosure  Schedule and (ii) acquisitions for cash in existing or
related  lines of  business  of  Monsanto  the fair  market  value of the  total
consideration  (including  the value of  indebtedness  acquired or assumed)  for
which  does not  exceed  the  amount  specified  in the  aggregate  for all such
acquisitions  in Section 4.2(e) of the Monsanto  Disclosure  Schedule,  Monsanto
shall not, and shall not permit any of its  Subsidiaries to, acquire or agree to
acquire by merging or consolidating  with, or by purchasing a substantial equity
interest in or a  substantial  portion of the assets of, or by any other manner,
any business or any  corporation,  partnership,  association  or other  business
organization  or division  thereof or otherwise  acquire or agree to acquire any
assets  (other  than the  acquisition  of assets used in the  operations  of the
business of Monsanto and its  Subsidiaries  in the ordinary  course);  provided,
however,  that the foregoing shall not prohibit (x) internal  reorganizations or
consolidations  involving existing  Subsidiaries of Monsanto or (y) the creation
of new  Subsidiaries  of Monsanto  organized  to conduct or continue  activities
otherwise permitted by this Agreement.

                  (f) No Dispositions.  Other than (i) internal  reorganizations
or consolidations involving existing Subsidiaries of Monsanto, (ii) dispositions
referred to in Monsanto SEC Reports filed prior to the date of this Agreement or
(iii) as may be required by or in conformance with law or regulation in order to
permit or facilitate the consummation of the transactions contemplated hereby or
the transactions  disclosed in the Monsanto Disclosure Schedule,  Monsanto shall
not, and shall not permit any of its Subsidiaries to, sell,  lease,  encumber or
otherwise dispose of, or agree to sell, lease, encumber or otherwise dispose of,
any of its assets  (including  capital  stock of  Subsidiaries  of Monsanto  but
excluding inventory in the ordinary course of business) the fair market value of
the total  consideration  (including the value of the  indebtedness  acquired or
assumed) for which does not exceed the amount specified in the aggregate for all
such dispositions in Section 4.2(f) of the Monsanto Disclosure Schedule.

                                       31
<PAGE>

                  (g) Investments;  Indebtedness.  Monsanto shall not, and shall
not permit any of its  Subsidiaries  to, other than in  connection  with actions
permitted  by  Section  4.2(e),   (i)  make  any  loans,   advances  or  capital
contributions  to, or  investments  in,  any  other  Person,  other  than (x) by
Monsanto or a  Subsidiary  of Monsanto  to or in Monsanto or any  Subsidiary  of
Monsanto,  (y) pursuant to any contract or other legal obligation of Monsanto or
any of its  Subsidiaries  existing at the date of this  Agreement  or (z) in the
ordinary course of business consistent with past practice in an aggregate amount
not in  excess  of the  aggregate  amount  specified  in  Section  4.2(g) of the
Monsanto  Disclosure  Schedule or (ii) create,  incur, assume or suffer to exist
any indebtedness,  issuances of debt securities,  guarantees,  loans or advances
not in existence  as of the date of this  Agreement  and except  pursuant to the
credit facilities, indentures and other arrangements in existence on the date of
this  Agreement  or in the  ordinary  course of  business  consistent  with past
practice,  in  each  case  as  such  credit  facilities,  indentures  and  other
arrangements and other existing indebtedness may be amended, extended, modified,
refunded, renewed or refinanced after the date of this Agreement.

                  (h) Pooling;  Tax-Free  Qualification.  Monsanto shall use its
reasonable best efforts not to, and shall use its reasonable best efforts not to
permit  any of its  Subsidiaries  to,  take any  action  (including  any  action
otherwise permitted by this Section 4.2) that would prevent or impede the Merger
from  qualifying as a "pooling of  interests"  for  accounting  purposes or as a
"reorganization" under Section 368 of the Code.

                  (i) Compensation. Other than as contemplated by Section 5.6 or
by Sections 4.2(c) or 4.2(i) of the Monsanto Disclosure Schedule, Monsanto shall
not increase  the amount of  compensation  of any director or executive  officer
except in the ordinary  course of business  consistent  with past practice or as
required  by an  existing  agreement,  make any  increase  in or  commitment  to
increase any employee  benefits,  issue any  additional  Monsanto Stock Options,
adopt or make any  commitment to adopt any additional  employee  benefit plan or
make any  contribution,  other than regularly  scheduled  contributions,  to any
Monsanto Benefit Plan.

                  (j)  Accounting  Methods;  Income  Tax  Elections.  Except  as
disclosed in Monsanto SEC Reports filed prior to the date of this Agreement,  or
as required by a Governmental  Entity,  Monsanto shall not change its methods of
accounting in effect at December 31, 1997, except as required by changes in GAAP
as concurred  in by  Monsanto's  independent  auditors.  Monsanto  shall not (i)
change its fiscal year or (ii) make any material tax election, other than in the
ordinary course of business consistent with past practice.

                  (k)  Certain  Agreements.  Monsanto  shall not,  and shall not
permit any of its  Subsidiaries to, enter into any agreement or arrangement that
limits or  otherwise  restricts  Monsanto or any of its  Subsidiaries  or any of
their respective  affiliates or any successor thereto,  or that could, after the
Effective Time, limit or restrict Newco or any of its affiliates  (including the
Surviving  Corporation) or any successor thereto,  from engaging or competing in
any line of business or in any  geographic  area which  agreement or arrangement
would  reasonably be expected to have a Material Adverse Effect on Newco and its
Subsidiaries  (including the Surviving Corporation and its Subsidiaries),  taken
together, after giving effect to the Merger.

                                       32
<PAGE>

                  (l) Rights  Agreement.  Monsanto  shall not  amend,  modify or
waive any  provision of the Rights  Agreement,  and shall not take any action to
redeem the Rights or render the Rights  inapplicable to any  transaction,  other
than to permit another  transaction  that the Monsanto Board has determined is a
Superior  Proposal  (as  defined  in  Section  8.11),  to be  consummated  after
termination of this Agreement.

                  4.3  Governmental  Filings.  Each party  shall (a) confer on a
regular  and  frequent  basis  with the  other  and (b)  report  (to the  extent
permitted by law or regulation or any applicable  confidentiality  agreement) on
operational  matters.  Monsanto  and AHP shall file all  reports  required to be
filed by each of them with the SEC (and all other Governmental Entities) between
the date of this  Agreement  and the  Effective  Time and shall  (to the  extent
permitted by law or  regulation  or any  applicable  confidentiality  agreement)
deliver  to the  other  party  copies  of all such  reports,  announcements  and
publications promptly after the same are filed.

                  4.4 Control of Other Party's  Business.  Nothing  contained in
this Agreement shall give Monsanto, directly or indirectly, the right to control
or direct AHP's  operations  prior to the Effective Time.  Nothing  contained in
this Agreement shall give AHP,  directly or indirectly,  the right to control or
direct Monsanto's operations prior to the Effective Time. Prior to the Effective
Time,  each of Monsanto and AHP shall  exercise,  consistent  with the terms and
conditions  of  this  Agreement,  complete  control  and  supervision  over  its
respective operations.


                                    ARTICLE V

                              ADDITIONAL AGREEMENTS

                  5.1 Preparation of Proxy Statement; Stockholders Meetings.

                  (a) As promptly as reasonably  practicable  following the date
hereof,  AHP and Monsanto  shall  prepare and file with the SEC proxy  materials
which  shall  constitute  the  Joint  Proxy   Statement/Prospectus  (such  proxy
statement/prospectus,  and any  amendments or  supplements  thereto,  the "Joint
Proxy  Statement/Prospectus")  and AHP  shall  prepare  and file a  registration
statement  on Form S-4 with  respect to the  issuance of AHP Common Stock in the
Merger (the "Form S-4"). The Joint Proxy  Statement/Prospectus  will be included
in and will constitute a part of the Form S-4 as AHP's prospectus.  The Form S-4
and the Joint Proxy Statement/Prospectus shall comply as to form in all material
respects with the  applicable  provisions of the Securities Act and the Exchange
Act and the rules and regulations thereunder. Each of AHP and Monsanto shall use
reasonable  best efforts to have the Form S-4  declared  effective by the SEC as
promptly as  reasonably  practicable  after  filing with the SEC and to keep the
Form S-4  effective  as long as is necessary  to  consummate  the Merger and the
transactions  contemplated  thereby.  AHP and  Monsanto  shall,  as  promptly as
practicable after receipt thereof, provide the other party copies of any written
comments  and advise the other party of any oral  comments,  with respect to the
Joint  Proxy  Statement/Prospectus  received  from  the SEC.  AHP  will  provide
Monsanto with a reasonable opportunity to review and comment on any amendment 

                                       33
<PAGE>

or  supplement  to the Form S-4  prior to  filing  such  with the SEC,  and will
provide   Monsanto  with  a  copy  of  all  such  filings  made  with  the  SEC.
Notwithstanding  any other  provision  herein to the  contrary,  no amendment or
supplement  (including  by  incorporation  by  reference)  to  the  Joint  Proxy
Statement/Prospectus  or the Form S-4 shall be made without the approval of both
parties, which approval shall not be unreasonably withheld or delayed; provided,
that with  respect  to  documents  filed by a party  which are  incorporated  by
reference  in the Form S-4 or Joint  Proxy  Statement/Prospectus,  this right of
approval  shall  apply only with  respect to  information  relating to the other
party or its business,  financial  condition or results of operations.  AHP will
use reasonable best efforts to cause the Joint Proxy Statements/Prospectus to be
mailed to AHP  stockholders,  and Monsanto will use  reasonable  best efforts to
cause  the  Joint  Proxy   Statement/Prospectus   to  be  mailed  to  Monsanto's
stockholders,  in each case as  promptly  as  practicable  after the Form S-4 is
declared  effective  under the  Securities  Act.  AHP shall also take any action
(other than qualifying to do business in any jurisdiction in which it is not now
so qualified or to file a general consent to service of process)  required to be
taken under any applicable  state  securities  laws in connection with the Share
Issuance and Monsanto shall furnish all information  concerning Monsanto and the
holders of Monsanto  Common Stock as may be  reasonably  requested in connection
with any such action. Each party will advise the other party,  promptly after it
receives notice thereof, of the time when the Form S-4 has become effective, the
issuance of any stop  order,  the  suspension  of the  qualification  of the AHP
Common Stock issuable in connection  with the Merger for offering or sale in any
jurisdiction,  or any  request  by the  SEC for  amendment  of the  Joint  Proxy
Statement/Prospectus or the Form S-4. If at any time prior to the Effective Time
any  information  relating  to AHP or  Monsanto,  or  any  of  their  respective
affiliates, officers or directors, should be discovered by AHP or Monsanto which
should be set forth in an amendment or  supplement to any of the Form S-4 or the
Joint Proxy Statement/Prospectus so that any of such documents would not include
any misstatement of a material fact or omit to state any material fact necessary
to make the statements  therein,  in light of the circumstances under which they
were made, not  misleading,  the party which  discovers such  information  shall
promptly notify the other party hereto and, to the extent required by law, rules
or  regulations,   an  appropriate   amendment  or  supplement  describing  such
information  shall  be  promptly  filed  with  the SEC and  disseminated  to the
stockholders of AHP and Monsanto.

                  (b) Subject to Section  5.5,  Monsanto  shall,  as promptly as
reasonably  practicable  following  the execution of this  Agreement,  duly take
(subject to compliance  with the provisions of Section 3.1(e) and Section 3.2(e)
(provided that Monsanto shall have used  reasonable  best efforts to ensure that
such  representation  is true and  correct)),  all lawful  action to call,  give
notice  of,  convene  and hold a  meeting  of its  stockholders  (the  "Monsanto
Stockholders  Meeting")  (which  meeting the parties  intend to be held no later
than October 1, 1998) for the purpose of obtaining  the Required  Monsanto  Vote
with respect to the transactions contemplated by this Agreement,  shall take all
lawful action to solicit the adoption of this Agreement by the Required Monsanto
Vote;  and the Board of Directors of Monsanto shall  recommend  adoption of this
Agreement by the  stockholders of Monsanto to the effect as set forth in Section
3.2(f),  and shall not  withdraw,  modify or  materially  qualify  in any manner
adverse to AHP such  recommendation  or take any action or make any statement in
connection with the Monsanto  Stockholders Meeting materially  inconsistent with
such   recommendation   (collectively,   

                                       34
<PAGE>

an "Adverse  Change in the Monsanto  Recommendation");  provided  the  foregoing
shall not prohibit accurate  disclosure (and such disclosure shall not be deemed
to be an Adverse Change in the Monsanto  Recommendation) of factual  information
regarding the business,  financial  condition or results of operations of AHP or
Monsanto or the fact that an Acquisition Proposal has been made, the identity of
the party making such proposal or the material terms of such proposal (provided,
that the Board of Directors of Monsanto does not withdraw,  modify or materially
qualify in any manner adverse to AHP its  recommendation) in the Form S-4 or the
Joint  Proxy  Statement/Prospectus,  to  the  extent  such  information,  facts,
identity or terms is required to be  disclosed  therein  under  applicable  law;
provided  further  that the Board of  Directors  of Monsanto may make an Adverse
Change in the Monsanto Recommendation prior to the Monsanto Stockholders Meeting
if (i) after the date of this Agreement, Monsanto acquires Knowledge of facts or
circumstances  that the Board of Directors of Monsanto  determines in good faith
constitute a material adverse development with respect to AHP and (ii) the Board
of Directors of Monsanto  determines in good faith that because of such material
adverse development, based upon the advice of outside legal counsel to Monsanto,
the failure to effect such Adverse Change in the Monsanto  Recommendation  would
violate the fiduciary duties of the Monsanto Board of Directors under applicable
law.

                  (c)  Subject  to  Section  5.5,  AHP  shall,  as  promptly  as
reasonably  practicable  following  the execution of this  Agreement,  duly take
(subject to compliance  with the provisions of Section 3.2(e) and Section 3.1(e)
(provided that AHP shall have used  reasonable  best efforts to ensure that such
representation  is true and correct) all lawful action to call,  give notice of,
convene and hold a meeting of its stockholders (the "AHP Stockholders  Meeting")
(which  meeting the parties intend to be held no later than October 1, 1998) for
the  purpose  of  obtaining  the  Required  AHP Vote with  respect  to the Share
Issuance,  shall take all lawful  action to solicit  the  approval  of the Share
Issuance  by the  Required  AHP Vote;  and the Board of  Directors  of AHP shall
recommend  approval  of the Share  Issuance  by the  stockholders  of AHP to the
effect as set  forth in  Section  3.1(f),  and  shall  not  withdraw,  modify or
materially qualify in any manner adverse to Monsanto such recommendation or take
any action or make any statement in connection with the AHP Stockholders Meeting
materially  inconsistent  with such  recommendation  (collectively,  an "Adverse
Change in the AHP  Recommendation");  provided the foregoing  shall not prohibit
accurate  disclosure (and such  disclosure  shall not be deemed to be an Adverse
Change in the AHP Recommendation) of factual information regarding the business,
financial  condition  or  operations  of AHP or  Monsanto  or the  fact  that an
Acquisition  Proposal  has been made,  the  identity  of the party  making  such
proposal or the material  terms of such  proposal  (provided,  that the Board of
Directors of AHP does not withdraw,  modify or materially  qualify in any manner
adverse  to  Monsanto  its  recommendation)  in the Form S-4 or the Joint  Proxy
Statement/Prospectus,  to the extent such information,  facts, identity or terms
is required to be disclosed  therein under applicable law; provided further that
the  Board  of  Directors  of  AHP  may  make  an  Adverse  Change  in  the  AHP
Recommendation  prior to the AHP  Stockholders  Meeting if (i) after the date of
this Agreement,  AHP acquires Knowledge of facts or circumstances that the Board
of  Directors of AHP  determines  in good faith  constitute  a material  adverse
development  with  respect to Monsanto  and (ii) the Board of  Directors  of AHP
determines  in good faith that  because of such  material  adverse  development,
based upon the advice of 

                                       35
<PAGE>

outside legal  counsel to AHP, the failure to effect such Adverse  Change in the
AHP  Recommendation  would  violate  the  fiduciary  duties  of the AHP Board of
Directors under applicable law.

                  5.2  Newco Board of Directors; Office of the Chairman; Name.

                  (a) At or  prior to the  Effective  Time,  AHP  will  take all
action  necessary to (i)  reconstitute the Board of Directors of Newco as of the
Effective Time in accordance with Exhibit 5.2(a) hereto,  (ii) cause Mr. John R.
Stafford  and Mr.  Robert B. Shapiro to be  appointed  Co-Chairmen  and Co-Chief
Executive Officers of Newco as of the Effective Time and establish an "Office of
the Chairmen" as of the Effective  Time,  each in accordance with Exhibit 5.2(a)
hereto.

                  (b) AHP shall  change its name as of the  Effective  Time to a
new name to be mutually  agreed upon by Monsanto and AHP prior to the  Effective
Time.

                  5.3 Access to Information.  Upon reasonable notice, each party
shall (and shall cause its Subsidiaries  to) afford to the officers,  employees,
accountants,  counsel, financial advisors and other representatives of the other
party reasonable access during normal business hours, during the period prior to
the  Effective  Time,  to all its  properties,  books,  contracts,  commitments,
records,  officers and employees and, during such period,  such party shall (and
shall cause its  Subsidiaries to) furnish promptly to the other party (a) a copy
of each report,  schedule,  registration  statement  and other  document  filed,
published,  announced  or  received  by it during  such  period  pursuant to the
requirements  of Federal or state  securities  laws, as  applicable  (other than
documents which such party is not permitted to disclose under  applicable  law),
and (b) consistent with its legal obligations,  all other information concerning
it and its business, properties and personnel as such other party may reasonably
request  (including  consultation  on a regular  basis  with  respect to the AHP
Specified  Litigation Matters or the Monsanto Specified  Litigation  Matters, as
the case may  be);  provided,  however,  that  either  party  may  restrict  the
foregoing access to the extent that any law,  treaty,  rule or regulation of any
Governmental  Entity  applicable  to  such  party  requires  such  party  or its
Subsidiaries to restrict  access to any properties or  information.  The parties
will hold any such  information  which is non-public in confidence to the extent
required by, and in accordance  with,  the provisions of the letters dated March
4,  1998  and May 28,  1998  between  Monsanto  and  AHP  (the  "Confidentiality
Agreements").  Any  investigation  by AHP  or  Monsanto  shall  not  affect  the
representations and warranties of Monsanto or AHP, as the case may be.

                  5.4  Reasonable Best Efforts.

                  (a)  Subject to the terms and  conditions  of this  Agreement,
each party will use its  reasonable  best efforts to take, or cause to be taken,
all  actions  and to do, or cause to be done,  all things  necessary,  proper or
advisable under applicable laws and regulations to consummate the Merger and the
other  transactions  contemplated by this Agreement as soon as practicable after
the date hereof,  including (i) preparing and filing as promptly as  practicable
all  documentation  to effect all necessary  applications,  notices,  petitions,
filings,  tax ruling  requests and other  

                                       36
<PAGE>

documents  and to obtain as  promptly  as  practicable  all  consents,  waivers,
licenses,   orders,   registrations,   approvals,   permits,   tax  rulings  and
authorizations necessary or advisable to be obtained from any third party and/or
any  Governmental  Entity in order to consummate  the Merger or any of the other
transactions contemplated by this Agreement and (ii) taking all reasonable steps
as may be necessary to obtain all such  material  consents,  waivers,  licenses,
registrations,  permits,  authorizations,  tax rulings, orders and approvals. In
furtherance and not in limitation of the foregoing,  each party hereto agrees to
make an appropriate filing of a Notification and Report Form pursuant to the HSR
Act and any  other  Regulatory  Law  (as  defined  below)  with  respect  to the
transactions  contemplated  hereby as  promptly  as  practicable  after the date
hereof and to supply as promptly as practicable  any additional  information and
documentary material that may be requested pursuant to the HSR Act and any other
Regulatory  Law and to take all other actions  necessary to cause the expiration
or termination of the  applicable  waiting  periods under the HSR Act as soon as
practicable.  Nothing in this Section  5.4(a)  shall  require any of AHP and its
Subsidiaries  or  Monsanto  and its  Subsidiaries  to  sell,  hold  separate  or
otherwise  dispose of or conduct their business in a specified  manner, or agree
to sell,  hold separate or otherwise  dispose of or conduct their  business in a
specified manner, or permit the sale,  holding separate or other disposition of,
any assets of AHP,  Monsanto or their respective  Subsidiaries or the conduct of
their  business in a specified  manner,  whether as a condition to obtaining any
approval from a Governmental Entity or any other Person or for any other reason,
if such sale,  holding  separate  or other  disposition  or the conduct of their
business  in a  specified  manner is not  conditioned  on the  Closing  or would
reasonably  be  expected  to have a  Material  Adverse  Effect  on Newco and its
Subsidiaries  (including the Surviving Corporation and its Subsidiaries),  taken
together, after giving effect to the Merger.

                  (b) Each of AHP and Monsanto  shall,  in  connection  with the
efforts  referenced in Section 5.4(a) to obtain all requisite material approvals
and authorizations for the transactions contemplated by this Agreement under the
HSR Act or any other  Regulatory  Law,  use its  reasonable  best efforts to (i)
cooperate  in all  respects  with each  other in  connection  with any filing or
submission and in connection with any investigation or other inquiry,  including
any  proceeding  initiated by a private  party,  (ii) promptly  inform the other
party of any  communication  received by such party from, or given by such party
to, the Antitrust Division of the Department of Justice (the "DOJ") or any other
Governmental  Entity  and of any  material  communication  received  or given in
connection with any proceeding by a private party, in each case regarding any of
the transactions contemplated hereby, and (iii) permit the other party to review
any communication  given by it to, and consult with each other in advance of any
meeting or conference with, the DOJ or any such other Governmental Entity or, in
connection with any proceeding by a private party, with any other Person, and to
the extent permitted by the DOJ or such other applicable  Governmental Entity or
other Person,  give the other party the opportunity to attend and participate in
such meetings and conferences. For purposes of this Agreement,  "Regulatory Law"
means the Sherman Act, as amended, the Clayton Act, as amended, the HSR Act, the
Federal  Trade  Commission  Act, as amended,  and all other  federal,  state and
foreign, if any, statutes, rules, regulations,  orders, decrees,  administrative
and judicial doctrines and other laws that are designed or intended to prohibit,
restrict or regulate actions having the purpose or effect of  monopolization  or
restraint of trade or lessening of competition.

                                       37
<PAGE>

                  (c) Subject to the terms and conditions of this Agreement,  in
furtherance  and not in limitation of the covenants of the parties  contained in
Sections  5.4(a)  and  5.4(b),  if any  administrative  or  judicial  action  or
proceeding,  including any  proceeding  by a private  party,  is instituted  (or
threatened to be instituted)  challenging any  transaction  contemplated by this
Agreement as violative of any  Regulatory  Law,  each of AHP and Monsanto  shall
cooperate in all respects with each other and use its respective reasonable best
efforts to contest and resist any such action or proceeding and to have vacated,
lifted, reversed or overturned any decree, judgment,  injunction or other order,
whether  temporary,  preliminary  or  permanent,  that  is in  effect  and  that
prohibits,  prevents or restricts consummation of the transactions  contemplated
by this Agreement.  Notwithstanding the foregoing or any other provision of this
Agreement,  nothing in this Section 5.4 shall limit a party's right to terminate
this Agreement pursuant to Article VII.

                  (d)  If  any  objections  are  asserted  with  respect  to the
transactions  contemplated  hereby  under any  Regulatory  Law or if any suit is
instituted by any  Governmental  Entity or any private party  challenging any of
the transactions contemplated hereby as violative of any Regulatory Law, each of
AHP and  Monsanto  shall use its  reasonable  best  efforts to resolve  any such
objections or challenge as such Governmental Entity or private party may have to
such transactions under such Regulatory Law so as to permit  consummation of the
transactions contemplated by this Agreement.

                  5.5 Acquisition  Proposals.  Without limitation on any of such
party's  other  obligations  under this  Agreement  (including  under Article IV
hereof), but except to the extent specifically  permitted to such party pursuant
to its Disclosure  Schedules  under  subsections  (e) and (f) of Sections 4.1 or
4.2, as the case may be, each of AHP and Monsanto agrees that neither it nor any
of  its  Subsidiaries  nor  any  of  the  officers  and  directors  of it or its
Subsidiaries  shall,  and that it shall use its reasonable best efforts to cause
its and its Subsidiaries' employees,  agents and representatives  (including any
investment  banker,  attorney  or  accountant  retained  by it  or  any  of  its
Subsidiaries) not to, directly or indirectly,  initiate,  solicit,  encourage or
knowingly facilitate (including by way of furnishing  information) any inquiries
or the making of any proposal or offer with respect to a merger, reorganization,
share   exchange,   consolidation,   business   combination,   recapitalization,
liquidation, dissolution or similar transaction involving it, or any purchase or
sale  of  the  consolidated   assets  (including  without  limitation  stock  of
Subsidiaries and Majority Owned  Affiliates) of such party and its Subsidiaries,
taken as a whole,  having an aggregate  value equal to 10% or more of the market
capitalization  of such party, or any purchase or sale of, or tender or exchange
offer for, 10% or more of the equity securities of such party (any such proposal
or offer (other than a proposal or offer made by the other party or an affiliate
thereof) being hereinafter  referred to as an "Acquisition  Proposal").  Each of
AHP and Monsanto  further agrees that neither it nor any of its Subsidiaries nor
any of the officers and directors of it or its  Subsidiaries  shall, and that it
shall  use its  reasonable  best  efforts  to  cause  its and its  Subsidiaries'
employees, agents and representatives (including any investment banker, attorney
or accountant  retained by it or any of its  Subsidiaries)  not to,  directly or
indirectly,  have any discussion with or provide any confidential information or
data to any  Person  relating  to an  Acquisition  Proposal,  or  engage  in any
negotiations  concerning an Acquisition  Proposal,  or knowingly  facilitate any
effort or attempt to make or  implement  an  Acquisition  Proposal  or accept an
Acquisition 

                                       38
<PAGE>

Proposal.  Notwithstanding  anything  herein  to the  contrary,  each of AHP and
Monsanto or its respective  Board of Directors  shall be permitted to (A) to the
extent  applicable,  comply with Rule 14d-9 and Rule 14e-2 promulgated under the
Exchange  Act with  regard to an  Acquisition  Proposal,  (B) in  response to an
unsolicited  bona fide  written  Acquisition  Proposal by any Person,  recommend
approval of such an unsolicited  bona fide written  Acquisition  Proposal to its
stockholders or effect an Adverse Change in the AHP or Monsanto  Recommendation,
as the case may be, or (C) engage in any  discussions or  negotiations  with, or
provide any information  to, any Person in response to an unsolicited  bona fide
written Acquisition Proposal by any such Person, if and only to the extent that,
in any such case as is  referred to in clause (B) or (C),  (i) its  Stockholders
Meeting shall not have occurred,  (ii) its Board of Directors (x) in the case of
clause  (B)  above,  concludes  in good  faith  that such  Acquisition  Proposal
constitutes  a Superior  Proposal  (as  defined in  Section  8.11) and  provides
written notice of  termination  of this Agreement  pursuant to Section 7.1(f) or
(y) in the  case  of  clause  (C)  above  concludes  in  good  faith  that  such
Acquisition  Proposal  could  reasonably  be  expected  to result in a  Superior
Proposal,  (iii) prior to  providing  any  information  or data to any Person in
connection  with an  Acquisition  Proposal  by any  such  Person,  its  Board of
Directors  receives  from such  Person  an  executed  confidentiality  agreement
containing confidentiality terms at least as stringent as those contained in the
March 4, 1998 confidentiality agreement between Monsanto and AHP, and (iv) prior
to providing any information or data to any Person or entering into  discussions
or negotiations with any Person, its Board of Directors notifies the other party
promptly  of  such  inquiries,   proposals  or  offers  received  by,  any  such
information requested from, or any such discussions or negotiations sought to be
initiated  or  continued  with,  any  of  its  representatives   indicating,  in
connection with such notice,  the name of such Person and the material terms and
conditions  of any  inquiries,  proposals  or offers.  Each of AHP and  Monsanto
agrees that it will  promptly  keep the other  party  informed of the status and
terms of any such  proposals  or  offers  and the  status  and terms of any such
discussions or  negotiations.  Each of AHP and Monsanto agrees that it will, and
will cause its officers, directors and representatives to, immediately cease and
cause to be terminated any activities,  discussions or negotiations  existing as
of the date of this Agreement with any parties conducted heretofore with respect
to any  Acquisition  Proposal.  Each of AHP and Monsanto agrees that it will use
reasonable  best  efforts  to  promptly  inform  its  directors,  officers,  key
employees,  agents and  representatives  of the  obligations  undertaken in this
Section  5.5.  Nothing in this  Section  5.5 shall (x) permit AHP or Monsanto to
terminate this Agreement (except as specifically provided in Article VII hereof)
or (y) affect any other obligation of AHP or Monsanto under this Agreement.

                  5.6 Employee Benefits Matters.

                  (a)  Continuation  and  Comparability  of  Benefits.  From the
Effective Time until  December 31, 1999,  Newco shall provide  compensation  and
employee  benefits  under  Benefit  Plans (as  defined in  Section  8.11) to the
employees  and  former  employees  of AHP  and  Monsanto  and  their  respective
Subsidiaries (the "Newco Employees") that are in the aggregate no less favorable
than those  provided to such persons  pursuant to the Benefit Plans in effect on
the date hereof.  Without limiting the generality of the foregoing,  Newco shall
continue  through  December 31, 1999 the  Monsanto  Separation  Plan  (effective
January 1, 1998) in effect for Newco  

                                       39
<PAGE>

Employees  who are  employed by Monsanto  or any of its  Subsidiaries  as of the
Effective  Time, and, to the extent AHP adopts a severance plan (as provided for
in Section 4.1(i) of the AHP Disclosure Schedule), for those Newco Employees who
are employed by AHP or any of its  Subsidiaries  as of the Effective  Time,  any
such AHP  severance  plan,  in each case without any  amendment  adverse to such
Newco  Employees,  other than as required by law.  Nothing herein shall prohibit
any changes to the  Benefit  Plans that may be (i)  required by law  (including,
without limitation,  any applicable qualification requirements of Section 401(a)
of the Code),  (ii) necessary as a technical  matter to reflect the transactions
contemplated  hereby or (iii) required for Newco to provide or permit investment
in its securities.  Furthermore,  nothing herein shall require Newco to continue
any  particular  Benefit Plan or prevent the  amendment or  termination  thereof
(subject to the  maintenance,  in the aggregate,  of the benefits as provided in
the preceding sentence).

                  (b)  Pre-Existing  Limitations;  Deductibles;  Service Credit.
With  respect to any Benefit  Plans in which any Newco  Employees  first  become
eligible to participate,  on or after the Effective Time, and in which are plans
that the Newco  Employees did not  participate  prior to the Effective Time (the
"New  Newco  Plans"),  Newco  shall:  (A)  waive  all  pre-existing   conditions
exclusions  and waiting  periods  with  respect to  participation  and  coverage
requirements  applicable  to the Newco  Employees  under any New Newco  Plans in
which such  employees may be eligible to participate  after the Effective  Time;
(B) provide each Newco Employee with credit for any  co-payments and deductibles
paid prior to the Effective Time (to the same extent such credit was given under
the  analogous  Benefit  Plan prior to the  Effective  Time) in  satisfying  any
applicable deductible or out-of-pocket requirements under any New Newco Plans in
which such  employees may be eligible to participate  after the Effective  Time,
and (C)  recognize  all service of the Newco  Employees  with AHP and  Monsanto,
respectively,  for all  purposes  (including,  without  limitation,  purposes of
eligibility to participate, vesting credit, entitlement to benefits, and benefit
accrual)  in any New Newco  Plan in which  such  employees  may be  eligible  to
participate  after the Effective  Time, to the extent such service is taken into
account under the applicable New Newco Plan; provided,  that the foregoing shall
not apply to the extent it would result in duplication of benefits, nor shall it
apply with  respect to benefit  accrual  under any New Newco Plan that is a cash
balance pension plan.

                  (c) Treatment of Equity and Equity - Based Benefit Plans. With
respect  to  any  AHP  and  Monsanto  Benefit  Plan  in  which  Newco  Employees
participated  immediately  prior to the Effective  Time that provides  incentive
compensation  or bonuses  relating to the equity  securities  (or any equivalent
thereof)  of either  AHP or  Monsanto  (the  "Equity  Benefit  Plans"),  AHP and
Monsanto shall, as soon as reasonably  practicable after the date hereof, create
a task force comprised of key executive officers and other employees  designated
by the  Compensation  Committee  or the  Board of  Directors  of each of AHP and
Monsanto  (half of whom  shall  be  employed  by AHP and  half of whom  shall be
employed by Monsanto)  (the "Task Force") which shall review all Equity  Benefit
Plans and recommend  appropriate  equity incentive plans for Newco. In so doing,
the Task Force shall fully and fairly take into  account the past  practices  of
both AHP and Monsanto and shall in good faith  consider  appropriate  methods by
which  Newco  

                                       40
<PAGE>

Employees may be fairly compensated  through the use of Equity Benefit Plans and
the relationship such use bears to cash compensation.

                  5.7  Fees  and   Expenses.   Whether  or  not  the  Merger  is
consummated,  all Expenses  incurred in connection  with this  Agreement and the
transactions  contemplated  hereby  shall be paid by the  party  incurring  such
Expenses,  except (a) if the Merger is  consummated,  the Surviving  Corporation
shall pay, or cause to be paid,  any and all property or transfer  taxes imposed
on Monsanto or its Subsidiaries and (b) Expenses incurred in connection with the
filing,  printing  and  mailing of the Joint Proxy  Statement/Prospectus,  which
shall be shared equally by AHP and Monsanto and (c) if  applicable,  as provided
in Section 7.2. As used in this Agreement, "Expenses" includes all out-of-pocket
expenses  (including,  without  limitation,  all fees and  expenses  of counsel,
accountants,  investment bankers,  experts and consultants to a party hereto and
its  affiliates)  incurred  by a party or on its  behalf in  connection  with or
related  to  the   authorization,   preparation,   negotiation,   execution  and
performance  of  this  Agreement  and  the  transactions   contemplated  hereby,
including  the  preparation,  printing,  filing and  mailing of the Joint  Proxy
Statement/Prospectus and the solicitation of stockholder approvals and all other
matters related to the transactions contemplated hereby.

                  5.8  Directors' and Officers'  Indemnification  and Insurance.
The Surviving Corporation shall, and Newco shall cause the Surviving Corporation
to, (i) indemnify and hold harmless, and provide advancement of expenses to, all
past  and  present  directors,  officers  and  employees  of  Monsanto  and  its
Subsidiaries  to the same extent such persons are  indemnified or have the right
to advancement of expenses as of the date of this Agreement by Monsanto pursuant
to  Monsanto's   certificate  of  incorporation,   by-laws  and  indemnification
agreements, if any, in existence on the date hereof with any directors, officers
and employees of Monsanto and its Subsidiaries  for acts or omissions  occurring
at or prior to the Effective Time (including for acts or omissions  occurring in
connection  with the  approval of this  Agreement  and the  consummation  of the
transactions  contemplated  hereby),  (ii) include and cause to be maintained in
effect  in the  Surviving  Corporation's  (or any  successor's)  certificate  of
incorporation  and by-laws for a period of six years after the  Effective  Time,
the  current  provisions  regarding   elimination  of  liability  of  directors,
indemnification of officers, directors and employees and advancement of expenses
contained in the certificate of incorporation  and by-laws of Monsanto and (iii)
cause to be maintained  for a period of six years after the  Effective  Time the
current policies of directors' and officers'  liability  insurance and fiduciary
liability  insurance   maintained  by  Monsanto  (provided  that  the  Surviving
Corporation (or any successor) may substitute  therefor policies of at least the
same  coverage and amounts  containing  terms and  conditions  which are, in the
aggregate,  no less  advantageous to the insured) with respect to claims arising
from facts or events that  occurred on or before the Effective  Time;  provided,
however,  that in no event shall the Surviving Corporation be required to expend
in any one year an amount in excess  of 200% of the  annual  premiums  currently
paid by Monsanto for such insurance; and, provided,  further, that if the annual
premiums  of  such  insurance   coverage  exceed  such  amount,   the  Surviving
Corporation  shall be obligated  to obtain a policy with the  greatest  coverage
available for a cost not exceeding such amount.

                                       41
<PAGE>

                  5.9  Specified  Litigation.  (a) From the date  hereof  to the
Closing  Date,  AHP shall  promptly  advise  Monsanto of all  developments,  and
provide Monsanto all additional  information not otherwise  provided pursuant to
Section 3.1(q), Known to AHP from time to time which is relevant and material to
an assessment of the liability exposure of AHP and its Subsidiaries with respect
to the AHP Specified Litigation Matters.

                  (b) From the date hereof to the Closing Date,  Monsanto  shall
promptly  advise  AHP  of all  developments,  and  provide  AHP  all  additional
information not otherwise provided pursuant to Section 3.2(r), Known to Monsanto
from  time to time  which is  relevant  and  material  to an  assessment  of the
liability exposure of Monsanto and its Subsidiaries with respect to the Monsanto
Specified Litigation Matters.

                  5.10  Public   Announcements.   AHP  and  Monsanto  shall  use
reasonable  best efforts to develop a joint  communications  plan and each party
shall use  reasonable  best  efforts (i) to ensure that all press  releases  and
other public  statements with respect to the  transactions  contemplated  hereby
shall be  consistent  with  such  joint  communications  plan,  and (ii)  unless
otherwise  required by applicable law or by obligations  pursuant to any listing
agreement with or rules of any securities  exchange,  to consult with each other
before issuing any press release or otherwise  making any public  statement with
respect to this Agreement or the transactions  contemplated  hereby. In addition
to the foregoing, except to the extent disclosed in or consistent with the Joint
Proxy  Statement/Prospectus  in accordance  with the  provisions of Section 5.1,
neither AHP nor Monsanto  shall issue any press  release or  otherwise  make any
public  statement or disclosure  concerning the other party or the other party's
business,  financial  condition or results of operations  without the consent of
the other party, which consent shall not be unreasonably withheld or delayed.

                  5.11 Accountant's  Letters.  (a) AHP shall use reasonable best
efforts to cause to be delivered to Monsanto two letters from AHP's  independent
public  accountants,  one  dated  the date on which  the Form S-4  shall  become
effective and one dated the Closing Date, each addressed to AHP and Monsanto, in
form and substance  reasonably  satisfactory  to Monsanto and customary in scope
and substance for comfort letters delivered by independent public accountants in
connection with registration  statements  similar to the Form S-4. AHP shall use
reasonable best efforts to cause to be delivered to Monsanto a letter from AHP's
independent  accountants dated as of the date the Form S-4 is declared effective
and as of the Closing Date,  stating that accounting for the Merger as a pooling
of interests under Opinion 16 of the Accounting  Principles Board and applicable
SEC rules and regulations is appropriate if the Merger is closed and consummated
as contemplated by this Agreement.

                  (b) Monsanto shall use reasonable  best efforts to cause to be
delivered to AHP two letters from Monsanto's independent public accountants, one
dated the date on which the Form S-4 shall  become  effective  and one dated the
Closing  Date,  each  addressed  to  Monsanto  and AHP,  in form  and  substance
reasonably  satisfactory to AHP and customary in scope and substance for comfort
letters  delivered  by  independent   public   accountants  in  connection  with
registration  statements  similar to the Form S-4. Monsanto shall use reasonable
best  efforts  to  

                                       42
<PAGE>

cause  to be  delivered  to AHP a  letter  from  Monsanto's  independent  public
accountants, addressed to Monsanto and AHP, dated as of the date the Form S-4 is
declared  effective  and as of the Closing  Date,  stating that they concur with
Monsanto's  conclusion that, as of the date of their report, no conditions exist
that would preclude  Monsanto's ability to be a party in a business  combination
to be accounted for as a pooling of interests.

                  (c) Each of AHP and Monsanto shall use reasonable best efforts
to cause the transactions contemplated by this Agreement,  including the Merger,
to be accounted for as a pooling of interests under Opinion 16 of the Accounting
Principles Board and applicable SEC rules and  regulations,  and such accounting
treatment to be accepted by the SEC.

                  5.12 Listing of Shares of AHP Common Stcok.  AHP shall use its
reasonable  best efforts to cause the shares of AHP Common Stock to be issued in
the Merger and the shares of AHP Common Stock to be reserved  for issuance  upon
exercise of the Monsanto  Stock  Options to be approved for listing on the NYSE,
subject to official notice of issuance, prior to the Closing Date.

                  5.13 Dividends.  After the date of this Agreement, each of AHP
and  Monsanto  shall  coordinate  with the other the payment of  dividends  with
respect to the AHP Common Stock and  Monsanto  Common Stock and the record dates
and payment dates relating thereto, it being the intention of the parties hereto
that holders of AHP Common Stock and Monsanto Common Stock shall not receive two
dividends, or fail to receive one dividend, for any single calendar quarter with
respect to their shares of AHP Common Stock and/or  Monsanto Common Stock or any
shares of AHP Common  Stock that any such holder  receives in exchange  for such
shares of Monsanto Common Stock in the Merger.

                  5.14  Affiliates.  (a) Not  less  than 45  days  prior  to the
Effective Time,  Monsanto shall deliver to AHP a letter  identifying all persons
who, in the opinion of  Monsanto,  may be deemed at the time this  Agreement  is
submitted for adoption by the stockholders of Monsanto, "affiliates" of Monsanto
for purposes of Rule 145 under the  Securities Act or for purposes of qualifying
the Merger for pooling of interests accounting treatment under Opinion 16 of the
Accounting  Principles Board and applicable SEC rules and regulations,  and such
list shall be updated as  necessary to reflect  changes  from the date  thereof.
Monsanto  shall use reasonable  best efforts to cause each person  identified on
such list to deliver to AHP not less than 30 days prior to the Effective Time, a
written agreement  substantially in the form attached as Exhibit 5.14 hereto (an
"Affiliate  Agreement").  Not less than 45 days prior to the Effective Time, AHP
shall deliver to Monsanto a letter  identifying  all persons who, in the opinion
of AHP, may be deemed  "affiliates" of AHP for purposes of qualifying the Merger
for pooling of interests accounting treatment under Opinion 16 of the Accounting
Principles Board and applicable SEC rules and  regulations,  and such list shall
be updated as necessary to reflect  changes from the date hereof.  AHP shall use
reasonable best efforts to cause each person  identified on such list to deliver
to  Monsanto  not less  than 30 days  prior to the  Effective  Time,  a  written
agreement  including the substance of paragraphs  (C), (D) and E of Exhibit 5.14
hereto.

                                       43
<PAGE>

                  (b) Newco shall use its reasonable  best efforts to publish no
later than 90 days after the end of the first month after the Effective  Time in
which there are at least 30 days of post-Merger combined operations (which month
may be the month in which the  Effective  Time occurs),  combined  sales and net
income  figures  as  contemplated  by and in  accordance  with the  terms of SEC
Accounting Series Release No. 135.

                  5.15 Employment  Agreements.  As promptly as practicable after
the  date of this  Agreement,  AHP  shall  offer  to  enter  into an  employment
agreement with John R. Stafford and an amended and restated employment agreement
with Robert B.  Shapiro,  to become  effective as of the Effective  Time,  which
shall be  substantially  consistent  with the terms and  principles set forth in
Section 5.15 of each of the AHP Disclosure  Schedule and the Monsanto Disclosure
Schedule.

                                   ARTICLE VI

                              CONDITIONS PRECEDENT

                  6.1  Conditions  to Each  Party's  Obligation  to  Effect  the
Merger. The respective obligations of Monsanto, AHP and Merger Sub to effect the
Merger are subject to the satisfaction or waiver on or prior to the Closing Date
of the following conditions:

                  (a) Stockholder Approval. (i) Monsanto shall have obtained the
Required  Monsanto Vote in connection with the adoption of this Agreement by the
stockholders  of Monsanto and (ii) AHP shall have obtained the Required AHP Vote
in connection  with the approval of the Share  Issuance by the  stockholders  of
AHP.

                  (b) No Injunctions or  Restraints,  Illegality.  No Laws shall
have  been  adopted  or  promulgated,   and  no  temporary   restraining  order,
preliminary  or permanent  injunction  or other order issued by a court or other
Governmental Entity of competent jurisdiction shall be in effect, (i) having the
effect of making the Merger illegal or otherwise prohibiting consummation of the
Merger or (ii) which otherwise  would  reasonably be expected to have a Material
Adverse  Effect  on  Newco  and  its   Subsidiaries   (including  the  Surviving
Corporation  and its  Subsidiaries),  taken  together after giving effect to the
Merger; provided,  however, that the provisions of this Section 6.1(b) shall not
be available to any party whose failure to fulfill its  obligations  pursuant to
Section 5.4 shall have been the cause of, or shall have  resulted in, such order
or injunction.

                  (c) HSR Act. The waiting  period (and any  extension  thereof)
applicable  to the Merger under the HSR Act shall have been  terminated or shall
have expired.

                  (d)  Governmental  and  Regulatory  Approvals.  Other than the
filing provided for under Section 1.3 and filings pursuant to the HSR Act (which
are  addressed  in Section  6.1(c)),  all  consents,  approvals  and actions of,
filings with and notices to any Governmental Entity required of AHP, Monsanto or
any of their  Subsidiaries to consummate the Merger,  the Share Issuance and the
other transactions  contemplated  hereby, the failure of which to be 


                                       44
<PAGE>

obtained or taken would reasonably be expected to have a Material Adverse Effect
on Newco and its  Subsidiaries  (including  the  Surviving  Corporation  and its
Subsidiaries), taken together after giving effect to the Merger, shall have been
obtained; provided however, that the provisions of this Section 6.1(d) shall not
be available to any party whose failure to fulfill its  obligations  pursuant to
Section 5.4 shall have been the cause of, or shall have resulted in, the failure
to obtain such consent or approval.

                  (e) NYSE Listing.  The shares of AHP Common Stock to be issued
in the Merger and such other shares to be reserved  for  issuance in  connection
with the Merger  shall have been  approved  for listing on the NYSE,  subject to
official notice of issuance.

                  (f)  Effectiveness  of the Form S-4.  The Form S-4 shall  have
been  declared  effective  by the SEC under the  Securities  Act.  No stop order
suspending the  effectiveness  of the Form S-4 shall have been issued by the SEC
and no  proceedings  for that purpose shall have been initiated or threatened by
the SEC.

                  (g) Pooling. Monsanto shall have received and delivered to AHP
and AHP's independent public  accountants,  a letter from its independent public
accountants,  dated as of the date the Form S-4 is declared  effective and as of
the Closing Date,  stating that Monsanto  qualifies as a "combining  company" in
accordance  with  the  criteria  set  forth  in  Opinion  16 of  the  Accounting
Principles  Board and accordingly is a poolable  entity.  AHP shall received and
delivered to Monsanto,  a letter from its independent public accountants,  dated
as of the date the Form S-4 is declared  effective  and as of the Closing  Date,
stating that  accounting for the Merger as a pooling of interests  under Opinion
16 of the Accounting  Principles  Board and applicable SEC rules and regulations
is appropriate if the Merger is closed and  consummated as  contemplated by this
Agreement.  Notwithstanding  the  foregoing,  the  satisfaction  of this Section
6.1(g)  shall not be a  condition  to the  obligations  of a party to effect the
Merger if the failure to satisfy this condition results from any action taken or
agreed to be taken by or on behalf of such party.

                  6.2  Additional  Conditions to  Obligations  of AHP and Merger
Sub. The  obligations  of AHP and Merger Sub to effect the Merger are subject to
the  satisfaction  of, or waiver by AHP, on or prior to the Closing  Date of the
following conditions:

                  (a)    Representations    and   Warranties.    Each   of   the
representations  and  warranties of Monsanto set forth in this Agreement that is
qualified as to Material  Adverse Effect shall be true and correct,  and each of
the  representations and warranties of Monsanto set forth in this Agreement that
is not so qualified shall be true and correct in all material respects,  in each
case as of the date of this  Agreement and as of the Closing Date as though made
on and as of the  Closing  Date  (except to the extent in either  case that such
representations  and warranties  speak as of another date)  (provided,  that the
foregoing condition shall not apply to the representation and warranty set forth
in the second  sentence of Section  3.2(r)  except with  respect to any breaches
thereof  as to which AHP has  notified  Monsanto  prior to the AHP  Stockholders


                                       45
<PAGE>

Meeting),  and AHP shall have  received  a  certificate  of the chief  executive
officer and the chief financial officer of Monsanto to such effect.

                  (b)  Performance of  Obligations  of Monsanto.  Monsanto shall
have  performed or complied with all  agreements  and  covenants  required to be
performed  by it under this  Agreement  at or prior to the Closing Date that are
qualified as to Material  Adverse Effect and shall have performed or complied in
all material  respects with all other  agreements  and covenants  required to be
performed  by it under this  Agreement  at or prior to the Closing Date that are
not so  qualified,  and AHP  shall  have  received  a  certificate  of the chief
executive officer and the chief financial officer of Monsanto to such effect.

                  (c) Tax Opinion.  AHP shall have received from Simpson Thacher
&  Bartlett,  counsel to AHP, on or before the Form S-4 shall  become  effective
and, subsequently, on the Closing Date, a written opinion dated as of such dates
substantially  in the form of Exhibit  6.2(c)(1).  In  rendering  such  opinion,
counsel to AHP shall be entitled to rely upon information,  representations  and
assumptions  provided by AHP and Monsanto  substantially in the form of Exhibits
6.2(c)(2) and 6.2(c)(3)  (allowing for such amendments to the representations as
counsel to AHP deems necessary).

                  (d) Rights Agreement. No Share Acquisition Date or
Distribution Date shall have occurred pursuant to the Rights Agreement.

                  6.3  Additional  Conditions to  Obligations  of Monsanto.  The
obligations of Monsanto to effect the Merger are subject to the satisfaction of,
or  waiver  by  Monsanto,  on or  prior  to the  Closing  Date of the  following
additional conditions:

                  (a)    Representations    and   Warranties.    Each   of   the
representations  and  warranties  of AHP set  forth  in this  Agreement  that is
qualified as to Material  Adverse Effect shall be true and correct,  and each of
the  representations  and  warranties of AHP set forth in this Agreement that is
not so  qualified  shall be true and correct in all material  respects,  in each
case as of the date of this  Agreement and as of the Closing Date as though made
on and as of the  Closing  Date  (except to the extent in either  case that such
representations  and warranties  speak as of another date)  (provided,  that the
foregoing condition shall not apply to the representation and warranty set forth
in the second  sentence of Section  3.1(q)  except with  respect to any breaches
thereof as to which Monsanto has notified AHP prior to the Monsanto Stockholders
Meeting),  and Monsanto shall have received a certificate of the chief executive
officer and the chief financial officer of AHP to such effect.

                  (b)   Performance  of  Obilgations  of  AHP.  AHP  shall  have
performed or complied with all agreements and covenants required to be performed
by it under this Agreement at or prior to the Closing Date that are qualified as
to Material  Adverse Effect and shall have performed or complied in all material
respects with all other agreements and covenants  required to be performed by it
under this  Agreement at or prior to the Closing Date that are not so 



                                       46
<PAGE>

qualified, and Monsanto shall have received a certificate of the chief executive
officer and the chief financial officer of AHP to such effect.

                  (c) Tax Opinion.  Monsanto  shall have received from Arnold &
Porter,  special tax counsel to Monsanto, on or before the Form S-4 shall become
effective and, subsequently,  on the Closing Date, a written opinion dated as of
such dates  substantially  in the form of Exhibit  6.3(c)(1).  In rendering such
opinion,  counsel  to  Monsanto  shall be  entitled  to rely  upon  information,
representations  and assumptions  provided by AHP and Monsanto  substantially in
the form of Exhibits  6.2(c)(2) and 6.2(c)(3)  (allowing for such  amendments to
the representations as counsel to Monsanto deems necessary).


                                   ARTICLE VII

                            TERMINATION AND AMENDMENT

                  7.1 Termination.  This Agreement may be terminated at any time
prior to the  Effective  Time,  by action  taken or  authorized  by the Board of
Directors of the  terminating  party or parties,  and except as provided  below,
whether before or after approval of the matters presented in connection with the
Merger by the stockholders of Monsanto or AHP:

                  (a) By  mutual  written  consent  of AHP and  Monsanto  (which
consent  shall  not be  unreasonably  withheld  (i) in the  case of AHP,  if the
conditions  set  forth in  Sections  6.3(a) or 6.3(b)  would not  reasonably  be
expected to be satisfied  prior to the  Termination  Date (as defined in Section
7.1(b))  through the  exercise of AHP's  reasonable  best efforts or (ii) in the
case of Monsanto,  if the conditions set forth in Section 6.2(a) or 6.2(b) would
not reasonably be expected to be satisfied prior to the Termination Date through
the exercise of Monsanto's reasonable best efforts);

                  (b) By either  Monsanto or AHP if the Effective Time shall not
have  occurred on or before May 31,  1999 (the  "Termination  Date");  provided,
however,  that the right to terminate this  Agreement  under this Section 7.1(b)
shall not be  available  to any party whose  failure to fulfill  any  obligation
under this Agreement  (including without limitation such party's obligations set
forth in Section  5.4) has been the cause of, or resulted in, the failure of the
Effective Time to occur on or before the Termination Date;

                  (c) By either Monsanto or AHP if any  Governmental  Entity (i)
shall have issued an order,  decree or ruling or taken any other  action  (which
the parties shall have used their reasonable best efforts to resist,  resolve or
lift, as applicable,  in accordance with Section 5.4)  permanently  restraining,
enjoining  or  otherwise  prohibiting  the  transactions  contemplated  by  this
Agreement,  and such order,  decree,  ruling or other  action  shall have become
final and  nonappealable or (ii) shall have failed to issue an order,  decree or
ruling or to take any other action (which order, decree,  ruling or other action
the  parties  shall  have used their  reasonable  best  efforts  to  obtain,  in
accordance  with  Section  5.4),  in the case of each of (i) and  (ii)  which is


                                       47
<PAGE>

necessary to fulfill the conditions set forth in subsections  6.1(c) and (d), as
applicable,  and such denial of a request to issue such order, decree, ruling or
take such other  action  shall have become  final and  nonappealable;  provided,
however,  that the right to terminate this  Agreement  under this Section 7.1(c)
shall not be available to any party whose failure to comply with Section 5.4 has
been the cause of such action or inaction;

                  (d) By  either  Monsanto  or AHP if (i)  the  approval  by the
stockholders of Monsanto  required for the  consummation of the Merger shall not
have been obtained by reason of the failure to obtain the Required Monsanto Vote
or (ii) the approval by the  stockholders of AHP required for the Share Issuance
shall not have been obtained by reason of the failure to obtain the Required AHP
Vote,  in each case upon the  taking  of such  vote at a duly  held  meeting  of
stockholders  of  Monsanto  or AHP,  as the case may be,  or at any  adjournment
thereof;

                  (e) By AHP or  Monsanto,  as the case may be,  if the Board of
Directors of the other party,  prior to the other party's required  stockholders
approval, shall approve or recommend a Superior Proposal pursuant to Section 5.5
or shall resolve to take any of such actions;

                  (f) By AHP or Monsanto,  as the case may be, at any time prior
to its required stockholders approval, upon three Business Days' prior notice to
the other party,  if its Board of Directors shall have determined as of the date
of such notice that an Acquisition  Proposal is a Superior  Proposal;  provided,
however,  that (i) the  terminating  party shall have complied with Section 5.5,
(ii) prior to any such termination, the terminating party shall, if requested by
the other party in connection with a revised  proposal by it,  negotiate in good
faith for such  three  Business  Day period  with the other  party and (iii) the
Board of Directors of the terminating  party shall have concluded in good faith,
as of the  effective  date of such  termination,  after  taking into account any
revised proposal by the other party during such three Business Day period,  that
an Acquisition Proposal is a Superior Proposal and ; provided,  further, that it
shall be a condition to  termination by the  terminating  party pursuant to this
Section 7.l(f) that the terminating party shall have made the payment of the fee
to the other party required by Section 7.2(b)(i)(A) or Section 7.2(c)(i)(A),  as
the case may be;

                  (g) By  either  party,  if (A) the Board of  Directors  of AHP
shall have effected an Adverse Change in the AHP  Recommendation (or resolved to
take such action) or (B) the Board of Directors of Monsanto  shall have effected
an Adverse  Change in the  Monsanto  Recommendation  (or  resolved  to take such
action);

                  (h) By  Monsanto,  if  the  Monsanto  Board  of  Directors  so
determines  at  any  time  during  the  five-day  period   commencing  with  the
Determination Date, if both of the following conditions are satisfied:

                  (1) The Average AHP Closing Price on the Determination Date of
         shares of AHP Common  Stock  shall be less than the product of $48 5/16
         (the "AHP Starting Price") and 0.825; and



                                       48
<PAGE>

                  (2) (A) The  number  obtained  by  dividing  the  Average  AHP
         Closing Price on the Determination Date by the AHP Starting Price shall
         be less than (B) the number  obtained  by dividing  the  Average  Index
         Price on the  Determination  Date by the Average Index Price on May 29,
         1998 and subtracting 0.175 (the satisfaction of such conditions (1) and
         (2) being hereinafter referred to as the "AHP Stock Decline").

                  For purposes of this Section 7.1(h),  the following term shall
have the following meanings:

                  "Average AHP Closing  Price on the  Determination  Date" means
the average of the daily  closing  prices of AHP Common Stock as reported on the
NYSE  Composite  Transactions  Reporting  System (as reported in The Wall Street
Journal or, if not reported therein,  in another  authoritative  source) for the
fifteen  consecutive  NYSE full trading days (in which such shares are traded on
the NYSE)  ending at the close of  trading on the  Determination  Date (the "AHP
Stock Measurement Period").

                  For  purposes  of  Section  7.1(h)  and  Section  7.1(i),  the
following terms shall have the following meanings:

                  "Average  Index  Price"  means,  as of  May  29,  1998  or the
Determination Date, the weighted average (weighted in accordance with the market
capitalization  of such  companies  on May 29, 1998) of the average of the daily
closing  prices of the common stocks of the companies  composing the Index Group
as reported on the NYSE Composite  Transactions Reporting System (as reported in
The Wall Street Journal or, if not reported  therein,  in another  authoritative
source) on May 29, 1998 or for the fifteen  consecutive  NYSE full  trading days
(in which such shares are traded on the NYSE)  ending at the close of trading on
the Determination Date, as the case may be.

                  "Determination   Date"  means  the  trading  day   immediately
preceding the date on which all the conditions to Closing (other than conditions
that, by their terms,  cannot be satisfied  until the Closing Date) set forth in
Article VI shall have been satisfied or waived, subject to change as provided in
Section 7.1(h) or 7.1(i).

                  "Index  Group"  means the  group of the  eight  (8)  companies
listed in Section 7.1(h) of the AHP Disclosure  Schedule.  In the event that the
common stock of any such company ceases to be publicly traded, such company will
be removed from the Index Group,  and the weights (which have been determined as
set forth in Average Index Price based on market  capitalization)  redistributed
proportionately for purposes of determining the Average Index Price.

                  Notwithstanding  the  foregoing  provisions  of  this  Section
7.1(h),  if (i) the AHP Stock Price Decline would not be deemed to have occurred
pursuant to Section 7.1(h) if the Determination Date is not changed as described
in this  paragraph;  (ii) at any time  after the  commencement  of the AHP Stock
Measurement Period and on or prior to the Closing Date, any change, circumstance
or event is publicly disclosed by AHP in a SEC Report or a Dow Jones 



                                       49
<PAGE>

New Release which relates to the AHP Specified  Litigation Matters and which is,
or would  reasonably  be  expected  to be,  adverse to the  business,  financial
condition or results of operations of AHP or its  Subsidiaries  (the "AHP Public
Disclosure"),  and (iii) the material event, change or circumstance constituting
the AHP Public  Disclosure was (A) Known to AHP prior to the commencement of the
AHP Stock  Measurement  Period or (B)  became  Known to AHP during the AHP Stock
Measurement  Period but was not  disclosed by AHP within three  Business Days of
becoming Known to AHP (such third Business Day is hereinafter referred to as the
"Specified AHP Disclosure  Date"), the Determination Date shall be deemed not to
have occurred (x) in the case of clause (iii)(A) of this sentence, until fifteen
Business  Days  after  the AHP  Public  Disclosure  or (y) in the case of clause
(iii)(B) of this  sentence,  until the number of Business Days following the AHP
Public Disclosure is equal to the number of Business Days, if any, in the period
between the Specified AHP  Disclosure  Date and to and including the date of the
originally scheduled  Determination Date; provided,  that the Determination Date
shall  not be  delayed,  if at all,  in the case of each of  clause  (x) and (y)
beyond the later of the  originally  scheduled  Determination  Date or the fifth
Business Day  following the date of the AHP Public  Disclosure  (such later date
being referred to as the "Interim Date") unless, during the period (the "Interim
Measurement  Period")  commencing with the first Business Day following the date
of the AHP  Public  Disclosure  and  ending on the  Interim  Date,  an AHP Stock
Decline would have occurred pursuant to the provisions of this Section 7.1(h) if
the Interim  Date and the Interim  Measurement  Period were used for purposes of
such determination.  The foregoing provisions of this Section 7.1(h) relating to
the potential delay of the Determination Date may be waived by Monsanto.

                  If between the date of this  Agreement  and the  Determination
Date, the outstanding  shares of AHP Common Stock,  Monsanto Common Stock or any
security in the Index Group shall have been changed  into a different  number of
shares or a different class by reason of any reclassification, recapitalization,
stock split, split-up,  combination or exchange of shares or a stock dividend or
dividend payable in any other securities or extraordinary cash dividend shall be
declared with a record date within such period,  or any similar event shall have
occurred, appropriate adjustments shall be made to the Average AHP Closing Price
on  the   Determination   Date,  the  Average  Monsanto  Closing  Price  on  the
Determination Date (as defined in Section 7.1(i)) or the Average Index Price, as
the case may be, for purposes of this Agreement.

                  (i) By AHP, if the AHP Board of  Directors so  determines,  at
any time during the five-day period commencing with the  Determination  Date, if
both of the following conditions are satisfied:

                  (1) The Average  Monsanto  Closing Price on the  Determination
         Date of shares of Monsanto  Common Stock shall be less than the product
         of $55 3/8 (the "Monsanto Starting Price") and 0.825; and

                  (2) (A) The number  obtained by dividing the Average  Monsanto
         Closing Price on the Determination  Date by the Monsanto Starting Price
         shall be less than (B) the number  obtained  by  dividing  the  Average
         Index Price on the Determination Date by the 



                                       50
<PAGE>

         Average  Index  Price  on May  29,  1998  and  subtracting  0.175  (the
         satisfaction of such conditions (1) and (2) being hereinafter  referred
         to as the "Monsanto Stock Decline").

                  For purposes of this Section 7.1(i),  the following term shall
have the following meanings:

                  "Average  Monsanto  Closing Price on the  Determination  Date"
means the  average  of the daily  closing  prices of  Monsanto  Common  Stock as
reported on the NYSE Composite Transactions Reporting System (as reported in The
Wall  Street  Journal  or, if not  reported  therein,  in another  authoritative
source) for the fifteen consecutive NYSE full trading days (in which such shares
are traded on the NYSE) ending at the close of trading on the Determination Date
(the "Monsanto Stock Measurement period").

                  Notwithstanding  the  foregoing  provisions  of  this  Section
7.1(i),  if (i) the  Monsanto  Stock Price  Decline  would not be deemed to have
occurred pursuant to Section 7.1(i) if the Determination  Date is not changed as
described  in this  paragraph;  (ii) at any time after the  commencement  of the
Monsanto  Stock  Measurement  Period and on or prior to the  Closing  Date,  any
change,  circumstance or event is publicly disclosed by Monsanto in a SEC Report
or a Dow Jones News Release which relates to the Monsanto  Specified  Litigation
Matters and which is, or would  reasonably  be  expected  to be,  adverse to the
business,  financial  condition  or results of  operations  of  Monsanto  or its
Subsidiaries  (the "Monsanto  Public  Disclosure") and (iii) the material event,
change or circumstance constituting the Monsanto Public Disclosure was (A) Known
to Monsanto prior to the commencement of the Monsanto Stock  Measurement  Period
or (B) became Known to Monsanto during the Monsanto Stock Measurement Period but
was not disclosed by Monsanto  within three  Business Days of becoming  Known to
Monsanto (such third  Business Day is hereinafter  referred to as the "Specified
Monsanto  Disclosure  Date"), the Determination Date shall be deemed not to have
occurred  (x) in the case of clause  (iii)(A) of this  sentence,  until  fifteen
Business Days after the Monsanto Public  Disclosure or (y) in the case of clause
(iii)(B) of this  sentence,  until the number of  Business  Days  following  the
Monsanto  Public  Disclosure is equal to the number of Business Days, if any, in
the period between the Specified  Monsanto  Disclosure Date to and including the
date  of  the  originally  scheduled  Determination  Date;  provided,  that  the
Determination  Date  shall  not be  delayed,  if at all,  in the case of each of
clause (x) and (y) beyond the later of the  originally  scheduled  Determination
Date or the  fifth  Business  Day  following  the  date of the  Monsanto  Public
Disclosure  (such later date being  referred to as the "Interim  Date")  unless,
during the period (the "Interim  Measurement  Period") commencing with the first
Business Day following the date of the Monsanto Public  Disclosure and ending on
the Interim Date, a Monsanto  Stock Decline would have occurred  pursuant to the
provisions  of  this  Section  7.1(i)  if  the  Interim  Date  and  the  Interim
Measurement Period were used for purposes of such  determination.  The foregoing
provisions  of this  Section  7.1(i)  relating  to the  potential  delay  of the
Determination Date may be waived by AHP.

                  (j) By Monsanto,  if any Person shall have acquired beneficial
ownership of 30% or more of the outstanding  shares of AHP Common Stock and such
Person or its affiliates  shall 



                                       51
<PAGE>

be required  under the rules and  regulations  of the SEC to file a Schedule 13D
(or any successor form) with respect to such acquisition or ownership; or

                  (k) By AHP, if a Share  Acquisition  Date shall have  occurred
pursuant to the Rights Agreement.

                  7.2   Effect of Termination.

                  (a) In the event of  termination  of this  Agreement by either
Monsanto or AHP as provided  in Section  7.1,  this  Agreement  shall  forthwith
become void and there shall be no liability or  obligation on the part of AHP or
Monsanto or their  respective  officers  or  directors  except  with  respect to
Section 3.1(l), Section 3.2(m), the second sentence of Section 5.3, Section 5.7,
this  Section  7.2  and  Article  VIII,  which  provisions  shall  survive  such
termination, and except that, notwithstanding anything to the contrary contained
in this  Agreement,  neither AHP nor Monsanto shall be relieved or released from
any  liabilities or damages  arising out of its willful  material breach of this
Agreement.

                  (b) (i) AHP shall pay  Monsanto  the sum of $700  million (the
"AHP  Alternative  Transaction  Fee") if this Agreement is terminated  solely as
follows:  (A) if AHP shall terminate this Agreement  pursuant to Section 7.1(f),
(B) if (I) either  party  shall  terminate  this  Agreement  pursuant to Section
7.1(d)(ii)  due to the  failure  of AHP's  stockholders  to  approve  the  Share
Issuance, (II) at any time after the date of this Agreement and at or before the
date of the AHP  Stockholders  Meeting a  Business  Combination  (as  defined in
Section 7.2(d)) proposal with respect to AHP shall have been publicly  announced
or otherwise communicated to the AHP Board of Directors, and (III) within twelve
months of the  termination  of this  Agreement,  AHP  enters  into a  definitive
agreement  with any third  party with  respect to a  Business  Combination  or a
Business  Combination with respect to AHP is consummated,  (C) if Monsanto shall
terminate this Agreement pursuant to Section 7.1(e) or 7.1(j), (D) if (I) either
party shall  terminate this Agreement  pursuant to Section  7.1(b),  (II) at any
time  after the date of this  Agreement  and at or before the  Termination  Date
there shall exist a Business  Combination  proposal  with respect to AHP,  (III)
following the existence of such Business  Combination  proposal and prior to any
such  termination,  AHP shall have  intentionally  breached (and not cured after
notice  thereof) any of its covenants or agreements  set forth in this Agreement
in any material respect,  which breach shall have materially  contributed to the
failure of the  Effective  Time to occur on or before the  Termination  Date and
(IV) within twelve months of any such  termination of this Agreement,  AHP shall
enter  into a  definitive  agreement  with any third  party  with  respect  to a
Business   Combination  or  a  Business  Combination  with  respect  to  AHP  is
consummated,  or (E)(I) if either party shall terminate this Agreement  pursuant
to 7.1(g)(A), (II) at any time after the date of this Agreement and at or before
the Adverse Change in the AHP  Recommendation  a Business  Combination  proposal
with respect to AHP shall have been publicly announced or otherwise communicated
to the AHP  Board of  Directors,  and  (III)  within  twelve  months of any such
termination of this Agreement,  AHP shall enter into a definitive agreement with
any third party with respect to a Business Combination or a Business Combination
with respect to AHP is consummated, provided that, in the case of this subclause
(E) of Section  7.2(b)(i),  if the AHP  



                                       52
<PAGE>

Termination  Fee (as defined in Section  7.2(b)(ii)) has previously been paid in
connection with the termination of this Agreement pursuant to Section 7.1(g)(A),
then the amount of such fee shall be credited to the AHP Alternative Transaction
Fee.

                  (ii) AHP shall pay  Monsanto  the amount of $250  million (the
"AHP Termination  Fee") if this Agreement is terminated by either party pursuant
to Section  7.1(g)(A) in circumstances in which the AHP Alternative  Transaction
Fee is not then payable;  provided,  however, that the AHP Termination Fee shall
equal the  amount  of $75  million  in the event  that (a) the date on which the
Board of  Directors of AHP effects an Adverse  Change in the AHP  Recommendation
occurs  within five (5)  Business  Days prior to the  scheduled  date of the AHP
Stockholders   Meeting  and  (b)  prior  to  the  Adverse   Change  in  the  AHP
Recommendation  a  Monsanto  Stock  Decline  would be  deemed  to have  occurred
pursuant  to the  provisions  of  Section  7.1(i)  if  "Determination  Date" for
purposes  of such  calculation  was  deemed to be the  trading  day  immediately
preceding the date on which the AHP Board  effected an Adverse Change in the AHP
Recommendation  (the  valuation  period  ending at the close of  trading on such
deemed  Determination  Date  is  hereinafter  referred  to as  the  "Alternative
Monsanto Stock Measurement  Period").  Notwithstanding  the foregoing,  if (x) a
Monsanto  Public  Disclosure  is made  during  the  Alternative  Monsanto  Stock
Measurement  Period  and (y)  during the  remaining  portion of the  Alternative
Monsanto  Stock  Measurement  Period  commencing  with the  first  Business  Day
following the date of the Monsanto Public  Disclosure,  a Monsanto Stock Decline
would be deemed to have occurred  pursuant to the  provisions of Section  7.1(i)
but (z) a Monsanto  Stock Decline would not be deemed to have occurred  pursuant
to the  provisions of Section  7.1(i) if the entire  Alternative  Monsanto Stock
Measurement Period were used for purposes of such calculation, then AHP shall be
entitled to delay the date of its scheduled AHP Stockholders Meeting to the 20th
Business Day after the Monsanto Public  Disclosure and the Alternative  Monsanto
Stock  Measurement  Period shall  commence with the first Business Day following
the date of the Monsanto  Public  Disclosure,  for purposes of  determining  the
relevant AHP Termination Fee.

                  (iii) AHP shall pay  Monsanto  the fixed amount of $75 million
as an expense and  displacement  payment if this  Agreement is terminated by AHP
pursuant to Section 7.1(i).

                  (c) (i)  Monsanto  shall pay AHP the sum of $700  million (the
"Monsanto  Alternative  Transaction Fee") if this Agreement is terminated solely
as follows:  (A) if Monsanto shall terminate this Agreement  pursuant to Section
7.1(f),  (B) if (I) either  party shall  terminate  this  Agreement  pursuant to
Section  7.1(d)(i) due to the failure of Monsanto's  stockholders  to adopt this
Agreement  and  approve  the  Merger,  (II) at any time  after  the date of this
Agreement  and at or  before  the date of the  Monsanto  Stockholders  Meeting a
Business  Combination proposal with respect to Monsanto shall have been publicly
announced or otherwise communicated to the Monsanto Board of Directors and (III)
within twelve months of the termination of this Agreement,  Monsanto enters into
a  definitive  agreement  with  any  third  party  with  respect  to a  Business
Combination  proposal  or a Business  Combination  with  respect to  Monsanto is
consummated,  (C) if AHP shall  terminate  this  Agreement  pursuant  to Section
7.1(e) or  7.1(k),  (D) if (I)  either  party  shall  terminate  this  Agreement
pursuant to Section  7.1(b),  (II) at any time 



                                       53
<PAGE>

after the date of this  Agreement  and at or before the  Termination  Date there
shall exist a Business  Combination  proposal  with respect to  Monsanto,  (III)
following the existence of such a Business Combination proposal and prior to any
such  termination,  Monsanto  shall have  intentionally  breached (and not cured
after notice  thereof)  any of its  covenants  or  agreements  set forth in this
Agreement in any material respect which breach shall have materially contributed
to the failure of the Effective Time to occur on or before the Termination  Date
and (IV)  within  twelve  months  of any  such  termination  of this  Agreement,
Monsanto  shall  enter into a  definitive  agreement  with any third  party with
respect to a  Business  Combination  proposal  or a  Business  Combination  with
respect to Monsanto is  consummated,  or (E)(I) if either party shall  terminate
this  Agreement  pursuant to 7.1(g)(B),  (II) at any time after the date of this
Agreement and at or before the  termination  of this  Agreement  relating to the
Adverse Change in the Monsanto  Recommendation a Business  Combination  proposal
with  respect to  Monsanto,  shall have been  publicly  announced  or  otherwise
communicated  to the Monsanto  Board of Directors and (III) within twelve months
of  any  such  termination  of  this  Agreement,  Monsanto  shall  enter  into a
definitive agreement with any third party with respect to a Business Combination
or a Business  Combination  with  respect to Monsanto is  consummated,  provided
that, in the case of this  subclause (E) of Section  7.2(c)(i),  if the Monsanto
Termination  Fee (as defined in section  7.2(c)(ii)) has previously been paid in
connection with the termination of this Agreement pursuant to Section 7.1(g)(B),
then the  amount  of such fee  shall be  credited  to the  Monsanto  Alternative
Transaction Fee.

                  (ii)  Monsanto  shall pay AHP the amount of $250  million (the
"Monsanto  Termination  Fee") if this  Agreement is  terminated  by either party
pursuant to Section 7.1(g)(B) in circumstances in which the Monsanto Alternative
Transaction  Fee is not then  payable;  provided,  however,  that  the  Monsanto
Termination  Fee shall equal the amount of $75 million in the event that (a) the
date on which the Board of  Directors of Monsanto  effects an Adverse  Change in
the Monsanto  Recommendation  occurs  within five (5) Business Days prior to the
scheduled date of the Monsanto Stockholders Meeting and (b) prior to the Adverse
Change in the Monsanto  Recommendation  an AHP Stock  Decline would be deemed to
have occurred  pursuant to the  provisions of Section  7.1(h) if  "Determination
Date"  for  purposes  of such  calculation  was  deemed  to be the  trading  day
immediately  preceding the date on which the Monsanto  Board effected an Adverse
Change in the Monsanto  Recommendation (the valuation period ending at the close
of trading on such deemed  Determination Date is hereinafter  referred to as the
"Alternative AHP Stock Measurement Period").  Notwithstanding the foregoing,  if
(x)  an  AHP  Public  Disclosure  is  made  during  the  Alternative  AHP  Stock
Measurement  Period and (y) during the remaining  portion of the Alternative AHP
Stock  Measurement  Period  commencing with the first Business Day following the
date of the AHP Public Disclosure,  an AHP Stock Decline would be deemed to have
occurred  pursuant  to the  provisions  of  Section  7.1(h) but (z) an AHP Stock
Decline  would not be deemed to have  occurred  pursuant  to the  provisions  of
Section 7.1(h) if the entire  Alternative AHP Stock Measurement Period were used
for purposes of such  calculation,  then Monsanto shall be entitled to delay the
date of its scheduled Monsanto  Stockholders Meeting for such number of Business
Days as would permit a fifteen  Business Day Alternative  AHP Stock  Measurement
Period  commencing with the date of the AHP Public  Disclosure,  for purposes of
determining the applicable Monsanto Termination Fee.


                                       54
<PAGE>

                  (iii)  Monsanto  shall pay AHP the fixed amount of $75 million
as an expense  and  displacement  payment if this  Agreement  is  terminated  by
Monsanto pursuant to Section 7.1(h).

                  (d)  For  the  purposes  of  this   Section   7.2,   "Business
Combination"  means with respect to AHP or  Monsanto,  as the case may be, (i) a
merger,  reorganization,  consolidation,  share exchange,  business combination,
recapitalization, liquidation, dissolution or similar transaction involving such
party as a result of which  either (A) such party's  stockholders  prior to such
transaction  (by  virtue  of their  ownership  of such  party's  shares)  in the
aggregate  cease to own at least  60% of the  voting  securities  of the  entity
surviving or resulting  from such  transaction  (or the ultimate  parent  entity
thereof) or,  regardless  of the  percentage of voting  securities  held by such
stockholders,  if any Person shall beneficially own, directly or indirectly,  at
least 30% of the voting  securities of such ultimate  parent entity,  or (B) the
individuals  comprising  the  board of  directors  of such  party  prior to such
transaction  do not  constitute  a majority  of the board of  directors  of such
ultimate  parent  entity,  (ii) a  sale,  lease,  exchange,  transfer  or  other
disposition  of at least 50% of the assets of such  party and its  Subsidiaries,
taken as whole, in a single transaction or a series of related transactions,  or
(iii)  the  acquisition,  directly  or  indirectly,  by a Person  of  beneficial
ownership  of 30% or more of the common  stock of such party  whether by merger,
consolidation, share exchange, business combination, tender or exchange offer or
otherwise.

                  (e)  The AHP  Alternative  Transaction  Fee  and the  Monsanto
Alternative Transaction Fee required to be paid pursuant to Section 7.2(b)(i) or
7.2(c)(i),  as the  case  may be,  shall  be  paid  prior  to,  and  shall  be a
pre-condition to the effectiveness of, termination of this Agreement pursuant to
Section 7.1(f). Any other payment required to be made pursuant to Section 7.2(b)
or 7.2(c) shall be made not later than two Business Days after the entering into
of a definitive  agreement with respect to, or the  consummation  of, a Business
Combination, as applicable, or a termination pursuant to Section 7.1(e), Section
7.1(g),  Section 7.1(h),  Section 7.1(i) Section 7.1(j) or Section 7.1(k). In no
event  shall  more  than  one  AHP  Alternative   Transaction  Fee  or  Monsanto
Alternative  Transaction  Fee be  made.  No  AHP  Termination  Fee  or  Monsanto
Termination  Fee will be payable to  Monsanto or AHP, as the case may be, if (A)
the receiving party was at the time of the  termination  giving rise to such fee
in breach of its  covenants,  agreements or  representations  to the extent that
would  reasonably be expected to have a Material Adverse Effect on the receiving
party,  or on the  benefits  reasonably  expected  to be  received by the paying
party's  stockholders  from the Merger;  (B) the paying party has on or prior to
the action giving rise to such  termination  in good faith  asserted such breach
with  reasonable  specificity to the receiving  party and, unless such breach is
incurable,  has given the receiving party a reasonable  opportunity to cure such
breach;  and (C) the  existence of such breach was either (i) the sole basis for
the  Adverse  Change  in the AHP  Recommendation  or the  Adverse  Change in the
Monsanto Recommendation,  as the case may be, or (ii) the primary basis for such
change,  but  only (in the case of (ii))  if the  existence  of such  breach  or
breaches on their own constituted a sufficient basis for the Board of Directors'
good faith  determination  pursuant to the second  proviso of Section  5.1(b) or
Section 5.1(c), as the case may be. All payments under this Section 7.2 shall be
made by wire transfer of immediately available funds to an account designated by
the party entitled to receive payment.

                                       55
<PAGE>

                  7.3  Amendment.  This  Agreement may be amended by the parties
hereto,  by action taken or authorized by their respective  Boards of Directors,
at any time before or after approval of the matters presented in connection with
the  Merger  by the  stockholders  of  Monsanto  and AHP,  but,  after  any such
approval,  no  amendment  shall be made which by law or in  accordance  with the
rules  of  any  relevant  stock  exchange  requires  further  approval  by  such
stockholders  without such further  approval.  This Agreement may not be amended
except by an  instrument  in  writing  signed  on behalf of each of the  parties
hereto.

                  7.4  Extension;  Waiver.  At any time  prior to the  Effective
Time,  the parties  hereto,  by action taken or authorized  by their  respective
Boards of Directors, may, to the extent legally allowed, (i) extend the time for
the  performance  of any of the  obligations  or other acts of the other parties
hereto,  (ii)  waive any  inaccuracies  in the  representations  and  warranties
contained  herein or in any document  delivered  pursuant hereto and (iii) waive
compliance  with any of the  agreements  or  conditions  contained  herein.  Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in a written  instrument signed on behalf of such party.
The  failure of any party to this  Agreement  to assert any of its rights  under
this Agreement or otherwise shall not constitute a waiver of those rights.


                                  ARTICLE VIII

                               GENERAL PROVISIONS

                  8.1   Non-Survival   of   Representations,    Warranties   and
Agreements.  None  of  the  representations,  warranties,  covenants  and  other
agreements in this  Agreement or in any  instrument  delivered  pursuant to this
Agreement,   including   any   rights   arising   out  of  any  breach  of  such
representations,  warranties,  covenants and other agreements, shall survive the
Effective Time,  except for those covenants and agreements  contained herein and
therein  that by their  terms apply or are to be  performed  in whole or in part
after the Effective Time and this Article VIII.

                  8.2 Notices.  All notices and other  communications  hereunder
shall be in writing  and shall be deemed  duly given (a) on the date of delivery
if delivered personally,  or by telecopy or telefacsimile,  upon confirmation of
receipt,  (b) on the  first  Business  Day  following  the date of  dispatch  if
delivered by a recognized next-day courier service, or (c) on the tenth Business
Day following the date of mailing if delivered by registered or certified  mail,
return  receipt  requested,  postage  prepaid.  All notices  hereunder  shall be
delivered as set forth below,  or pursuant to such other  instructions as may be
designated in writing by the party to receive such notice:






                                       56
<PAGE>


                          (a)      if to AHP or Merger Sub, to

                                   American Home Products Corporation
                                   Five Giralda Farms
                                   Madison, New Jersey 07940
                                   Fax:  (973) 660-7156
                                   Attention:  Louis L. Hoynes, Esq.

                                   with a copy to

                                   Simpson Thacher & Bartlett
                                   425 Lexington Avenue
                                   New York, New York  10017
                                   Fax: (212) 455-2502
                                   Attention:  Charles I. Cogut, Esq.
                                               Robert E. Spatt, Esq.

                          (b)      if to Monsanto to

                                   Monsanto Company
                                   800 North Lindbergh Boulevard
                                   St. Louis, Missouri  63167
                                   Fax: (314) 694-6399
                                   Attention:  R. William Ide, III, Esq.

                                   with a copy to

                                   Wachtell, Lipton, Rosen & Katz
                                   51 West 52nd Street
                                   New York, New York  10019
                                   Fax: (212) 403-2000
                                   Attention:  Richard D. Katcher, Esq.
                                               Eric S. Robinson, Esq.

                  8.3 Interpretation. When a reference is made in this Agreement
to Sections,  Exhibits or Schedules,  such reference shall be to a Section of or
Exhibit or Schedule to this Agreement unless otherwise  indicated.  The table of
contents and headings  contained in this  Agreement are for  reference  purposes
only and  shall not  affect in any way the  meaning  or  interpretation  of this
Agreement.  Whenever the words "include",  "includes" or "including" are used in
this  Agreement,  they  shall be deemed  to be  followed  by the words  "without
limitation".

                  8.4  Counterparts.  This  Agreement  may be executed in one or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  



                                       57
<PAGE>

effective when one or more  counterparts have been signed by each of the parties
and delivered to the other party, it being understood that both parties need not
sign the same counterpart.

                  8.5  Entire Agreement; No Third Party Beneficiaries.

                  (a)  This   Agreement  and  the   Confidentiality   Agreements
constitute  the  entire   agreement  and  supersede  all  prior  agreements  and
understandings,  both  written and oral,  among the parties  with respect to the
subject matter hereof.

                  (b) This  Agreement  shall be binding upon and inure solely to
the  benefit of each party  hereto,  and nothing in this  Agreement,  express or
implied, is intended to or shall confer upon any other Person any right, benefit
or remedy of any nature  whatsoever under or by reason of this Agreement,  other
than Section 5.8 (which is intended to be for the benefit of the Persons covered
thereby and may be enforced by such Persons).

                  8.6  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance  with the laws of the State of Delaware  (without giving
effect to choice of law principles thereof).

                  8.7  Severability.  If any  term or  other  provision  of this
Agreement  is  invalid,  illegal or  incapable  of being  enforced by any law or
public  policy,   all  other  terms  and  provisions  of  this  Agreement  shall
nevertheless  remain in full force and effect so long as the  economic  or legal
substance of the transactions  contemplated hereby is not affected in any manner
materially  adverse to any party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall  negotiate  in good  faith to modify  this  Agreement  so as to effect the
original intent of the parties as closely as possible in an acceptable manner in
order that the  transactions  contemplated  hereby are consummated as originally
contemplated to the greatest extent possible.

                  8.8 Assignment.  Neither this Agreement nor any of the rights,
interests  or  obligations  hereunder  shall be  assigned  by any of the parties
hereto, in whole or in part (whether by operation of law or otherwise),  without
the prior written  consent of the other party,  and any attempt to make any such
assignment  without such consent shall be null and void,  except that Merger Sub
may assign,  in its sole  discretion,  any or all of its rights,  interests  and
obligations  under this  Agreement to any direct wholly owned  Subsidiary of AHP
without the consent of Monsanto, but no such assignment shall relieve Merger Sub
of any  of its  obligations  under  this  Agreement.  Subject  to the  preceding
sentence,  this Agreement  will be binding upon,  inure to the benefit of and be
enforceable by the parties and their respective successors and assigns.

                  8.9  Submission  to  Jurisdiction;  Waivers.  Each  of AHP and
Monsanto  irrevocably agrees that any legal action or proceeding with respect to
this  Agreement or for  recognition  and  enforcement of any judgment in respect
hereof  brought by the other party  hereto or its  successors  or assigns may be
brought and determined in the Chancery or other Courts of the State of Delaware,
and each of AHP and Monsanto hereby irrevocably  submits with regard 



                                       58
<PAGE>

to any such  action or  proceeding  for itself  and in respect to its  property,
generally and unconditionally, to the nonexclusive jurisdiction of the aforesaid
courts.  Each of AHP and Monsanto hereby  irrevocably  waives, and agrees not to
assert, by way of motion, as a defense, counterclaim or otherwise, in any action
or  proceeding  with  respect  to this  Agreement,  (a) any claim that it is not
personally  subject to the jurisdiction of the above-named courts for any reason
other than the failure to lawfully  serve process (b) that it or its property is
exempt or immune from  jurisdiction  of any such court or from any legal process
commenced in such courts (whether through service of notice, attachment prior to
judgment,  attachment in aid of execution of judgment,  execution of judgment or
otherwise),  and (c) to the fullest extent permitted by applicable law, that (i)
the suit,  action or proceeding in any such court is brought in an  inconvenient
forum,  (ii) the venue of such suit,  action or proceeding is improper and (iii)
this Agreement,  or the subject matter hereof, may not be enforced in or by such
courts.

                  8.10  Enforcement.  The parties agree that irreparable  damage
would occur in the event that any of the  provisions of this  Agreement were not
performed in accordance with their specific terms. It is accordingly agreed that
the parties shall be entitled to specific  performance of the terms hereof, this
being in  addition to any other  remedy to which they are  entitled at law or in
equity.

                  8.11  Definitions. As used in this Agreement:

                  (a) "beneficial  ownership" or  "beneficially  own" shall have
the  meaning  under  Section  13(d)  of the  Exchange  Act  and  the  rules  and
regulations thereunder.

                  (b) "Benefit  Plans" means,  with respect to any Person,  each
employee benefit plan,  program,  arrangement and contract  (including,  without
limitation,  any  "employee  benefit  plan," as defined  in Section  3(3) of the
Employee  Retirement  Income Security Act of 1974, as amended  ("ERISA") and any
bonus,  deferred  compensation,  stock bonus, stock purchase,  restricted stock,
stock  option,  employment,  termination,  stay  agreement  or bonus,  change in
control and severance plan, program,  arrangement and contract) in effect on the
date of this Agreement or disclosed on the Monsanto  Disclosure  Schedule or the
AHP  Disclosure  Schedule,  as the case  may be,  to which  such  Person  or its
Subsidiary is a party,  which is maintained or contributed to by such Person, or
with respect to which such Person could incur material  liability  under Section
4069, 4201 or 4212(c) of ERISA.

                  (c) "Board of  Directors"  means the Board of Directors of any
specified Person and any committees thereof.

                  (d)  "Business  Day"  means  any day on  which  banks  are not
required or authorized to close in the City of New York.

                  (e) "Known or  "Knowledge"  means,  with respect to any party,
the  knowledge of such party's  executive  officers  after  reasonable  inquiry,
including reasonable inquiry of such party's counsel.


                                       59
<PAGE>

                  (f) "Majority  Owned  Affiliate" when used with respect to any
party means any  corporation  or other  organization,  whether  incorporated  or
unincorporated,  at least a majority of the  securities  or other  interests  of
which  having by their terms  ordinary  voting  power to elect a majority of the
Board of Directors or others  performing  similar functions with respect to such
corporation or other organization, is directly or indirectly owned or controlled
by such  party or by any one or more of its  Subsidiaries,  or by such party and
one or more of its  Subsidiaries,  and  with  respect  to  which  such  party is
prevented,  by virtue of  contractual  limitations  or  limitations  imposed  in
organizational  documents, from electing a majority of the Board of Directors or
others performing similar functions.

                  (g)  "Material  Adverse  Effect"  means,  with  respect to any
entity,  any  change,  circumstance  or  effect  that,  individually  or in  the
aggregate with all other changes, circumstances and effects, is or is reasonably
likely to be  materially  adverse to (i) the  business,  financial  condition or
results of  operations  of such  entity and its  Subsidiaries  taken as a whole,
other than any change,  circumstance  or effect  relating  (x) to the economy or
financial markets in general or (y) in general to the industries in which AHP or
Monsanto  operate and not  specifically  relating to AHP or Monsanto or (ii) the
ability  of such  party to  consummate  the  transactions  contemplated  by this
Agreement;  provided,  however,  for purposes of satisfying  the  conditions set
forth in Sections 6.2(a) and 6.3(a) with respect to the representations  made in
Sections  3.1(h)  and 3.1(i) and  Sections  3.2(h) and 3.2(i) as of the  Closing
Date,  "Material Adverse Effect" shall also exclude any change,  circumstance or
effect  relating  to the AHP  Specified  Litigation  Matters  and  the  Monsanto
Specified Litigation Matters, as the case may be.

                  (h) "the other party" means, with respect to Monsanto, AHP and
means, with respect to AHP, Monsanto.

                  (i)  "Person"  means  an  individual,   corporation,   limited
liability company, partnership, association, trust, unincorporated organization,
other entity or group (as defined in the Exchange Act).

                  (j) "Subsidiary" when used with respect to any party means any
corporation or other organization,  whether incorporated or unincorporated,  (i)
of which such party or any other  Subsidiary of such party is a general  partner
(excluding partnerships, the general partnership interests of which held by such
party or any  Subsidiary  of such  party do not have a  majority  of the  voting
interests in such  partnership) or (ii) at least a majority of the securities or
other  interests of which having by their terms ordinary voting power to elect a
majority of the Board of Directors or others  performing  similar functions with
respect to such  corporation  or other  organization  is directly or  indirectly
owned or controlled by such party or by any one or more of its Subsidiaries,  or
by such party and one or more of its Subsidiaries, except for any Majority Owned
Affiliates.

                  (k) "Superior Proposal" means with respect to AHP or Monsanto,
as the case may be, a written  proposal  made by a Person other than either such
party  which  is for  (I) (i) a  merger,  reorganization,  consolidation,  share
exchange, business combination,  recapitalization,  


                                       60
<PAGE>

liquidation, dissolution or similar transaction involving such party as a result
of which  either (A) such party's  stockholders  prior to such  transaction  (by
virtue of their  ownership of such party's shares) in the aggregate cease to own
at least 50% of the voting  securities of the entity surviving or resulting from
such  transaction (or the ultimate parent entity thereof) or (B) the individuals
comprising the board of directors of such party prior to such transaction do not
constitute a majority of the board of directors of such ultimate  parent entity,
(ii) a sale, lease,  exchange,  transfer or other disposition of at least 50% of
the assets of such  party and its  Subsidiaries,  taken as a whole,  in a single
transaction  or a series of  related  transactions,  or (iii)  the  acquisition,
directly or  indirectly,  by a Person of beneficial  ownership of 50% or more of
the common stock of such party whether by merger, consolidation, share exchange,
business combination,  tender or exchange offer or otherwise,  and which is (II)
otherwise  on terms  which the Board of  Directors  of such  party in good faith
concludes (after  consultation with its financial advisors and outside counsel),
taking into account,  among other things, all legal,  financial,  regulatory and
other aspects of the proposal and the Person making the proposal,  (i) would, if
consummated,  result in a transaction that is more favorable to its stockholders
(in their capacities as stockholders),  from a financial point of view, than the
transactions  contemplated by this Agreement (after giving effect,  for purposes
of clause (iii) of Section  7.1(f),  to any revised  proposal  made by the other
party prior to the end of the three  business-day  period  referred to in clause
(ii) of Section 7.1(f)) and (ii) is reasonably capable of being completed.


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

                           [Intentionally Left Blank]
















                                       61
<PAGE>


                  IN WITNESS  WHEREOF,  AHP, Merger Sub and Monsanto have caused
this  Agreement  to be  signed  by  their  respective  officers  thereunto  duly
authorized, all as of the date first written above.


                                 AMERICAN HOME PRODUCTS CORPORATION


                                 By: /s/ John R. Stafford
                                    -----------------------------------------
                                      Name:  John R. Stafford
                                      Title: Chairman, President and Chief
                                             Executive Officer


                                  MA SUB, INC.


                                  By: /s/ John R. Stafford
                                     ----------------------------------------
                                       Name:  John R. Stafford
                                       Title: Chairman, President and Chief
                                              Executive Officer



                                  MONSANTO COMPANY


                                  By: /s/ Robert B. Shapiro
                                     ----------------------------------------
                                       Name:  Robert B. Shapiro
                                       Title: Chairman and Chief Executive 
                                              Officer











                                       62













 

                 [AMERICAN HOME PRODUCTS CORPORATION LETTERHEAD]

FOR IMMEDIATE RELEASE                        
MEDIA CONTACT - AHP                          INVESTOR CONTACT - AHP 
LOWELL B. WEINER                             THOMAS G. CAVANAGH     
973-660-5013                                 973-660-5706           
                                             

MEDIA CONTACT - MONSANTO
SCARLETT LEE FOSTER
314-694-2883
[email protected]


AMERICAN HOME PRODUCTS AND MONSANTO ANNOUNCE PLAN TO COMBINE TO
CREATE $96 BILLION LIFE SCIENCES COMPANY

         MADISON, N.J., AND ST. LOUIS, MO., June 1, 1998 - Monsanto Company
(NYSE: MTC) and American Home Products Corporation (NYSE: AHP) today have
announced that they have entered into a definitive agreement to combine the two
companies in a merger of equals transaction. The combined company would have a
market capitalization in excess of $96 billion based on current market prices.
The combined life sciences company will have a new name and 


                                     -more-
<PAGE>

strong global businesses in pharmaceuticals, agriculture, animal health,
consumer health care and nutrition, with combined expected sales in 1998 of
approximately $23 billion.

         AHP shareholders will retain their shares. Monsanto shareholders will
receive 1.15 shares in the new company for each share of Monsanto that they
currently own. Monsanto shareowners would own approximately 35 percent of the
combined company's shares.

         The combined company's board of directors will consist of 22 members,
with representation equally divided between AHP and Monsanto. Monsanto
Chairman and Chief Executive Officer Robert B. Shapiro and AHP Chairman,
President and Chief Executive Officer John R. Stafford will be co-chairmen and
co-CEOs. They will head an office of the chairmen. Members of that group and
their current positions are Robert G. Blount, AHP senior executive vice
president and chief financial officer; Richard U. De Schutter, Monsanto vice
chairman; Robert Essner, AHP executive vice president; and Hendrik A.
Verfaillie, Monsanto president.

         Mr. Essner will head the new company's pharmaceutical business; Mr. De
Schutter its consumer and nutrition businesses; and Mr. Verfaillie its
agricultural and animal health businesses. Mr. Blount will be the new company's
chief financial officer.  Corporate headquarters will be located in Madison, New

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<PAGE>

Jersey. The new company's agricultural business will be headquartered in St.
Louis, Missouri; the pharmaceutical business headquartered in Radnor,
Pennsylvania; the consumer health care and nutrition business headquartered in
Chicago, Illinois.

         "This new company is based on growth and opportunity. We're committed
to cutting edge science, to developing and marketing great products, and to a
philosophy of growth and value," said Mr. Stafford.

         Mr. Shapiro stated, "Our new company is designed to be successful in
the face of continued consolidation and increasing worldwide competition in the
life sciences. We will have the scientific depth, global marketing capabilities
and financial resources to take greater advantage of the opportunities before us
and to bring innovative new products to market faster."

         As a result of the merger, the companies expect to realize on an annual
basis between $1.25 billion and $1.5 billion in cost savings from synergies and
cost avoidance within three years from the closing. From the standpoint of AHP's
earnings, assuming the merger is consummated by year end 1998 and after
synergies and cost savings, earnings per share are anticipated to be diluted by
up to 15 percent in the first year, by a lesser amount in 2000, and accretive
thereafter.

         The transaction is subject to approval by both companies' shareowners,

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<PAGE>
normal governmental reviews and other customary conditions. The merger is
intended to qualify as a tax-free reorganization and to be accounted for on a
pooling of interests basis.

         Monsanto is a life sciences company, committed to finding solutions to
the growing global needs for food and health by applying advanced bioscience and
biotechnology to agriculture, nutrition and health. It makes and manufactures
high-value agricultural products, pharmaceuticals and food ingredients.

         AHP is one of the world's largest research-based pharmaceutical and
health care products companies. It is a leader in the discovery, development,
manufacturing and marketing of prescription drugs and over-the-counter
medications. It is also a global leader in vaccines, biotechnology, agricultural
products and animal health care.



         This news release contains certain forward-looking statements,
including, among other things, statements regarding each company's results of
operations and expected cost savings and earnings per share effects. These
forward-looking statements are based on current expectations, but actual results
may differ materially from anticipated future events or results. Certain factors
which could cause each company's actual results to differ materially from
expected and historical results are described in AHP's and Monsanto's periodic
reports filed with the Securiities and Exchange Commission, including Monsanto's
and AHP's 1997 annual reports and Forms 10-K and Exhibits 99 thereto,
respectively.

         This announcement is not an offer to sell nor a solicitation to buy any
securities. The offering with respect to the proposed merger will be made only
by the proxy statement/prospectus that will be distributed to shareowners in
connection with their consideration of the transaction.


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