CERTIFICATE OF INCORPORATION-AMENDED AND RESTATED

Exhibit 3.1


RESTATED CERTIFICATE OF INCORPORATION

OF

IDEXX LABORATORIES, INC.

(originally AgriTech Systems, Inc.)
(Incorporated December 19, 1983)

IDEXX Laboratories, Inc. (the "Corporation"), a corporation organized and
existing under and by virtue of the General Corporation Law of the State of
Delaware, does hereby integrate into this instrument all of the provisions of
its certificate of incorporation now in effect and operative as a result of
there having heretofore been filed with the Secretary of State of Delaware one
or more certificates or other instruments pursuant to any of the sections
referred to in Section 104 of the General Corporation Law of the State of
Delaware and adopt this restated certificate of incorporation (the "Restated
Certificate"). This Restated Certificate was duly adopted in accordance with the
provisions of Section 245 of the General Corporation Law of the State of
Delaware by the Board of Directors of the Corporation without a vote of the
stockholders and only restates and integrates and does not further amend the
provisions of the Corporation's certificate of incorporation as theretofore
amended or supplemented and there is no discrepancy between those provisions and
the provisions of this Restated Certificate.


* * * * * * *


FIRST: The name of the Corporation is IDEXX LABORATORIES, INC.

SECOND: The address of its registered office in the State of Delaware is
Corporation Trust Center, 1209 Orange Street, City of Wilmington, County of New
Castle. The name of its registered agent at such address is The Corporation
Trust Company.

THIRD: The nature of the business or purposes to be conducted or promoted
is:

To act as general or limited partner of a general or limited partnership
in any business enterprise which the Corporation would have the power to conduct
by itself.

To engage in any lawful act or activity for which corporations may be
organized under the General Corporation Law of Delaware.

FOURTH: The aggregate number of shares which the Corporation shall have
authority to issue is 15,500,000 of which (i) 15,000,000 shares shall be Common
Stock, $0.10 par value per share ("Common Stock"), and (ii) 500,000 shares shall
be Series Preferred Stock, $1.00 par value per share ("Series Preferred Stock").









Series Preferred Stock may be issued from time to time in one or more
series, each of such series to have such terms as stated or expressed herein and
in the resolution or resolutions providing for the issue of such series adopted
by the Board of Directors of the Corporation as hereinafter provided. Any shares
of Series Preferred Stock which may be redeemed, purchased or acquired by the
Corporation may be reissued except as otherwise provided by law. Different
series of Series Preferred Stock shall not be construed to constitute different
classes of shares for the purpose of voting by classes unless expressly
provided.

Authority is hereby expressly granted to the Board of Directors from time
to time to issue the Series Preferred Stock in one or more series, and in
connection with the creation of any such series, by resolution or resolutions
providing for the issue of the shares thereof, to determine and fix such voting
powers, full or limited, or no voting powers, and such designations, preferences
and relative participating, optional or other special rights, and
qualifications, limitations or restrictions thereof, including without
limitation thereof, dividend rights, conversion rights, redemption privileges
and liquidation preferences, as shall be stated and expressed in such
resolutions, all to the full extent now or hereafter permitted by the General
Corporation Law of Delaware. Without limiting the generality of the foregoing,
the resolutions providing for the issuance of any series of Series Preferred
Stock may provide that such series shall be superior or rank equally or be
junior to the Common Stock or any other series of Series Preferred Stock. No
vote of the holders of the Common Stock or Series Preferred Stock shall be
prerequisite to the issuance of any series of any shares of the Series Preferred
Stock authorized by and complying with the conditions of this Restated
Certificate, the right to such vote being expressly waived by all present and
future holders of the capital stock of the Corporation.

FIFTH: The Corporation is to have perpetual existence.

SIXTH: In furtherance and not in limitation of the powers conferred by
statute, the board of directors is expressly authorized to make, alter or repeal
the bylaws of the Corporation.

SEVENTH: Elections of directors need not be by written ballot unless the
bylaws of the Corporation shall so provide.

Meetings of stockholders may be held within or outside the State of
Delaware, as the by-laws may provide. The books of the Corporation may be kept
(subject to any provision contained in the statutes) outside the State of
Delaware at such place or places as may be designated from time to time by the
board of directors or in the by-laws of the Corporation.



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EIGHTH: The Corporation reserves the right to amend, alter, change or
repeal any provision contained in this Restated Certificate, in the manner now
or hereafter prescribed by statute, and all rights conferred upon stockholders
herein are granted subject to this reservation.

NINTH: No director of the Corporation shall be personally liable to the
Corporation or its stockholders for monetary damages for breach of fiduciary
duty as a Director; provided, however, that the foregoing clause shall not apply
to any liability of a Director (i) for any breach of the Director's duty of
loyalty to the Corporation or its stockholders, (ii) for acts or omissions not
in good faith or which involve intentional misconduct or a knowing violation of
law, (iii) under Section 174 of the General Corporation Law of the State of
Delaware, or (iv) for any transaction from which the Director derived an
improper personal benefit. This Article shall not eliminate or limit the
liability of a Director for any act or omission occurring prior to September 30,
1986.

TENTH: This Article is inserted for the management of the business and for
the conduct of the affairs of the Corporation, and it is expressly provided that
it is intended to be in furtherance and not in limitation or exclusion of the
powers conferred by the statutes of the State of Delaware.

1. NUMBER OF DIRECTORS. The number of directors which shall constitute
the whole Board of Directors shall be determined by resolution of a majority of
the Board of Directors, but in no event shall be less than three. The number of
directors may be decreased at any time and from time to time by a majority of
the directors then in office, but only to eliminate vacancies existing by reason
of the death, resignation, removal or expiration of the term of one or more
directors. The directors shall be elected at the annual meeting of stockholders
by such stockholders as have the right to vote on such election. Directors need
not be stockholders of the corporation.

2. CLASSES OF DIRECTORS. The Board of Directors shall be and is divided
into three classes: Class I, Class II and Class III. No one class shall have
more than one director more than any other class. If a fraction is contained in
the quotient arrived at by dividing the authorized number of directors by three,
then, if such fraction is one-third, the extra director shall be a member of
Class I and, if such fraction is two-thirds, one of the extra directors shall be
a member of Class I and the other extra director shall be a member of Class II,
unless otherwise provided for from time to time by resolution adopted by a
majority of the Board of Directors.

3. ELECTION OF DIRECTORS. Elections of directors need not be by written
ballot except as and to the extent provided in the By-Laws of the Corporation.










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4. TERMS OF OFFICE. Each director shall serve for a term ending on the
date of the third annual meeting following the annual meeting at which such
director was elected; provided, however, that each initial director in Class I
shall serve for a term ending on the date of the annual meeting next following
the end of the Corporation's fiscal year ending December 31, 1993; each initial
director in Class II shall serve for a term ending on the date of the annual
meeting next following the end of the Corporation's fiscal year ending December
31, 1992; and each initial director in Class III shall serve for a term ending
on the date of the annual meeting next following the end of the Corporation's
fiscal year ending December 31, 1991.

5. ALLOCATION OF DIRECTORS AMONG CLASSES IN THE EVENT OF INCREASES OR
DECREASES IN THE NUMBER OF DIRECTORS. In the event of any increase or decrease
in the authorized number of directors, (i) each director then serving as such
shall nevertheless continue as director of the class of which he is a member
until the expiration of his current term or his prior death, retirement or
resignation and (ii) the newly created or eliminated directorships resulting
from such increase or decrease shall be apportioned by the Board of Directors
among the three classes of directors so as to ensure that no one class has more
than one director more than any other class. To the extent possible, consistent
with the foregoing rule, any newly created directorships shall be added to those
classes whose terms of office are to expire at the latest dates following such
allocation, and any newly eliminated directorships shall be subtracted from
those classes whose terms of office are to expire at the earliest dates
following such allocation, unless otherwise provided for from time to time by
resolution adopted by a majority of the directors then in office, although less
than a quorum.

6. TENURE. Notwithstanding any provisions to the contrary contained
herein, each director shall hold office until his successor is elected and
qualified, or until his earlier death, resignation or removal.

7. VACANCIES. Any vacancy in the Board of Directors, however occurring,
including a vacancy resulting from an enlargement of the Board, may be filled
only by vote of a majority of the directors then in office, although less than a
quorum, or by a sole remaining director. A director elected to fill a vacancy
shall be elected for the unexpired term of his predecessor in office, if
applicable, and a director chosen to fill a position resulting from an increase
in the number of directors shall hold office until the next election of the
class for which such director shall have been chosen and until his successor is
elected and qualified, or until his earlier death, resignation or removal.

8. QUORUM. A majority of the total number of the whole Board of
Directors shall constitute a quorum at all meetings of the Board of Directors.
In the event one or more of the directors shall be disqualified to vote at any
meeting, then the required quorum shall be reduced by one for each such director
so disqualified;







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provided, however, that in no case shall less than one-third (1/3) of the number
so fixed constitute a quorum. In the absence of a quorum at any such meeting, a
majority of the directors present may adjourn the meeting from time to time
without further notice other than announcement at the meeting, until a quorum
shall be present.

9. ACTION AT MEETING. At any meeting of the Board of Directors at which
a quorum is present, the vote of a majority of those present shall be sufficient
to take any action, unless a different vote is specified by law or the
Corporation's Certificate of Incorporation or By-Laws.

10. REMOVAL. Any one or more or all of the directors may be removed,
with or without cause, by the holders of at least seventy-five percent (75%) of
the shares then entitled to vote at an election of directors.

11. STOCKHOLDER NOMINATIONS AND INTRODUCTION OF BUSINESS, ETC. Advance
notice of stockholder nominations for election of directors and other business
to be brought by stockholders before a meeting of stockholders shall be given in
the manner provided in the By-Laws of the Corporation.

12. AMENDMENTS TO ARTICLE. Notwithstanding any other provisions of law,
this Certificate of Incorporation or the Corporation's By-Laws, and
notwithstanding the fact that a lesser percentage may be specified by law, the
affirmative vote of the holders of at least seventy-five percent (75%) of the
votes which all the stockholders would be entitled to cast at any annual
election of directors or class of directors shall be required to amend or
repeal, or to adopt any provision inconsistent with, this Article TENTH.

ELEVENTH: Until the closing of a firm commitment, underwritten public
offering of the Corporation's Common Stock (a "Public Offering"), any action
required or permitted to be taken at any annual or special meeting of
stockholders of the Corporation may be taken without a meeting, without prior
notice and without a vote, if a consent in writing, setting forth the action so
taken, is signed by the holders of outstanding stock having not less than the
minimum number of votes that would be necessary to authorize or take such action
at a meeting at which all shares entitled to vote on such action were present
and voted. Prompt notice of the taking of corporate action without a meeting by
less than unanimous written consent shall be given to those stockholders who
have not consented in writing. Effective upon the closing of a Public Offering,
stockholders of the Corporation may not take any action by written consent in
lieu of a meeting. Notwithstanding any other provision of law, this Certificate
of Incorporation or the Corporation's By-laws, as amended, and notwithstanding
the fact that a lesser percentage may be specified by law, the affirmative vote
of the holders of at least seventy-five percent (75%) of the votes which all the
stockholders would be entitled to cast at any annual election of









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directors or class of directors shall be required to amend or repeal, or to
adopt any provision inconsistent with this Article ELEVENTH.

TWELFTH: Special meetings of stockholders may be called at any time by the
President or by the Chairman of the Board of Directors. Business transacted at
any special meeting of stockholders shall be limited to matters relating to the
purpose or purposes stated in the notice of meeting. Notwithstanding any other
provision of law, this Certificate of Incorporation or the Corporation's
By-laws, as amended, and notwithstanding the fact that a lesser percentage may
be specified by law, the affirmative vote of the holders of at least
seventy-five percent (75%) of the votes which all the stockholders would be
entitled to cast at any annual election of directors or class of directors shall
be required to amend or repeal, or to adopt any provision inconsistent with this
Article TWELFTH.

THIRTEENTH: 1. ACTIONS, SUITS AND PROCEEDINGS OTHER THAN BY OR IN THE
RIGHT OF THE CORPORATION. The Corporation shall indemnify each person who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the Corporation), by
reason of the fact that he is or was, or has agreed to become, a director or
officer of the Corporation, or is or was serving, or has agreed to serve, at the
request of the Corporation, as a director, officer or trustee of, or in a
similar capacity with, another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan) (all such persons being
referred to hereafter as an "Indemnitee"), or by reason of any action alleged to
have been taken or omitted in such capacity, against all expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by him or on his behalf in connection with such action, suit
or proceeding and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the Corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. The termination of any
action, suit or proceeding by judgment, order, settlement, conviction or upon a
plea of NOLO CONTENDERE or its equivalent, shall not, of itself, create a
presumption that the person did not act in good faith and in a manner which he
reasonably believed to be in, or not opposed to, the best interests of the
Corporation, and, with respect to any criminal action or proceeding, had
reasonable cause to believe that his conduct was unlawful. Notwithstanding
anything to the contrary in this Article, except as set forth in Section 6
below, the Corporation shall not indemnify an Indemnitee seeking indemnification
in connection with a proceeding (or part thereof) initiated by the Indemnitee
unless the initiation thereof was approved by the Board of Directors of the
Corporation.

2. ACTIONS OR SUITS BY OR IN THE RIGHT OF THE CORPORATION. The
Corporation shall indemnify any Indemnitee who was or is a party or is
threatened to be made a











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party to any threatened, pending or completed action or suit by or in the right
of the Corporation to procure a judgment in its favor by reason of the fact that
he is or was, or has agreed to become, a director or officer of the Corporation,
or is or was serving, or has agreed to serve, at the request of the Corporation,
as a director, officer or trustee of, or in a similar capacity with, another
corporation, partnership, joint venture, trust or other enterprise (including
any employee benefit plan), or by reason of any action alleged to have been
taken or omitted in such capacity, against all expenses (including attorneys'
fees) and amounts paid in settlement actually and reasonably incurred by him or
on his behalf in connection with such action, suit or proceeding and any appeal
therefrom, if he acted in good faith and in a manner he reasonably believed to
be in, or not opposed to, the best interests of the Corporation, except that no
indemnification shall be made in respect of any claim, issue or matter as to
which such person shall have been adjudged to be liable to the Corporation
unless and only to the extent that the Court of Chancery of Delaware or the
court in which such action or suit was brought shall determine upon application
that, despite the adjudication of such liability but in view of all the
circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses (including attorneys' fees) which the Court of
Chancery of Delaware or such other court shall deem proper.

3. INDEMNIFICATION FOR EXPENSES OF SUCCESSFUL PARTY. Notwithstanding
the other provisions of this Article, to the extent that an Indemnitee has been
successful, on the merits or otherwise, in defense of any action, suit or
proceeding referred to in Sections 1 and 2 of this Article, or in defense of any
claim, issue or matter therein, or on appeal from any such action, suit or
proceeding, he shall be indemnified against all expenses (including attorneys'
fees) actually and reasonably incurred by him or on his behalf in connection
therewith. Without limiting the foregoing, if any action, suit or proceeding is
disposed of, on the merits or otherwise (including a disposition without
prejudice), without (i) the disposition being adverse to the Indemnitee, (ii) an
adjudication that the Indemnitee was liable to the Corporation, (iii) a plea of
guilty or NOLO CONTENDERE by the Indemnitee, (iv) an adjudication that the
Indemnitee did not act in good faith and in a manner he reasonably believed to
be in or not opposed to the best interests of the Corporation, and (v) with
respect to any criminal proceeding, an adjudication that the Indemnitee had
reasonable cause to believe his conduct was unlawful, the Indemnitee shall be
considered for the purposes hereof to have been wholly successful with respect
thereto.

4. NOTIFICATION AND DEFENSE OF CLAIM. As a condition precedent to his
right to be indemnified, the Indemnitee must notify the Corporation in writing
as soon as practicable of any action, suit, proceeding or investigation
involving him for which indemnity will or could be sought. With respect to any
action, suit, proceeding or investigation of which the Corporation is so
notified, the Corporation will be entitled to participate therein at its own
expense and/or to assume the defense thereof at its own expense, with legal
counsel reasonably acceptable to the Indemnitee. After







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notice from the Corporation to the Indemnitee of its election so to assume such
defense, the Corporation shall not be liable to the Indemnitee for any legal or
other expenses subsequently incurred by the Indemnitee in connection with such
claim, other than as provided below in this Section 4. The Indemnitee shall have
the right to employ his own counsel in connection with such claim, but the fees
and expenses of such counsel incurred after notice from the Corporation of its
assumption of the defense thereof shall be at the expense of the Indemnitee
unless (i) the employment of counsel by the Indemnitee has been authorized by
the Corporation, (ii) counsel to the Indemnitee shall have reasonably concluded
that there may be a conflict of interest or position on any significant issue
between the Corporation and the Indemnitee in the conduct of the defense of such
action or (iii) the Corporation shall not in fact have employed counsel to
assume the defense of such action, in each of which cases the fees and expenses
of counsel for the Indemnitee shall be at the expense of the Corporation, except
as otherwise expressly provided by this Article. The Corporation shall not be
entitled, without the consent of the Indemnitee, to assume the defense of any
claim brought by or in the right of the Corporation or as to which counsel for
the Indemnitee shall have reasonably made the conclusion provided for in clause
(ii) above.

5. ADVANCE OF EXPENSES. Subject to the provisions of Section 6 below,
in the event that the Corporation does not assume the defense pursuant to
Section 4 of this Article of any action, suit, proceeding or investigation of
which the Corporation receives notice under this Article, any expenses
(including attorneys' fees) incurred by an Indemnitee in defending a civil or
criminal action, suit, proceeding or investigation or any appeal therefrom shall
be paid by the Corporation in advance of the final disposition of such matter,
PROVIDED, HOWEVER, that the payment of such expenses incurred by an Indemnitee
in advance of the final disposition of such matter shall be made only upon
receipt of an undertaking by or on behalf of the Indemnitee to repay all amounts
so advanced in the event that it shall ultimately be determined that the
Indemnitee is not entitled to be indemnified by the Corporation as authorized in
this Article. Such undertaking may be accepted without reference to the
financial ability of such person to make such repayment.

6. PROCEDURE FOR INDEMNIFICATION. In order to obtain indemnification or
advancement of expenses pursuant to Section 1, 2, 3 or 5 of this Article, the
Indemnitee shall submit to the Corporation a written request, including in such
request such documentation and information as is reasonably available to the
Indemnitee and is reasonably necessary to determine whether and to what extent
the Indemnitee is entitled to indemnification or advancement of expenses. Any
such indemnification or advancement of expenses shall be made promptly, and in
any event within 60 days after receipt by the Corporation of the written request
of the Indemnitee, unless with respect to requests under Section 1, 2 or 5 the
Corporation determines, by clear and convincing evidence, within such 60-day
period that the Indemnitee did not meet the applicable standard of conduct set
forth in Section 1 or








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2, as the case may be. Such determination shall be made in each instance by (a)
a majority vote of a quorum of the directors of the Corporation consisting of
persons who are not at that time parties to the action, suit or proceeding in
question ("disinterested directors"), (b) if no such quorum is obtainable, a
majority vote of a committee of two or more disinterested directors, (c) a
majority vote of a quorum of the outstanding shares of stock of all classes
entitled to vote for directors, voting as a single class, which quorum shall
consist of stockholders who are not at that time parties to the action, suit or
proceeding in question, (d) independent legal counsel (who may be regular legal
counsel to the Corporation), or (e) a court of competent jurisdiction.

7. REMEDIES. The right to indemnification or advances as granted by
this Article shall be enforceable by the Indemnitee in any court of competent
jurisdiction if the Corporation denies such request, in whole or in part, or if
no disposition thereof is made within the 60-day period referred to above in
Section 6. Unless otherwise provided by law, the burden of proving that the
Indemnitee is not entitled to indemnification or advancement of expenses under
this Article shall be on the Corporation. Neither the failure of the Corporation
to have made a determination prior to the commencement of such action that
indemnification is proper in the circumstances because the Indemnitee has met
the applicable standard of conduct, nor an actual determination by the
Corporation pursuant to Section 6 that the Indemnitee has not met such
applicable standard of conduct, shall be a defense to the action or create a
presumption that the Indemnitee has not met the applicable standard of conduct.
The Indemnitee's expenses (including attorneys' fees) incurred in connection
with successfully establishing his right to indemnification, in whole or in
part, in any such proceeding shall also be indemnified by the Corporation.

8. SUBSEQUENT AMENDMENT. No amendment, termination or repeal of this
Article or of the relevant provisions of the General Corporation Law of Delaware
or any other applicable laws shall affect or diminish in any way the rights of
any Indemnitee to indemnification under the provisions hereof with respect to
any action, suit, proceeding or investigation arising out of or relating to any
actions, transactions or facts occurring prior to the final adoption of such
amendment, termination or repeal.


9. OTHER RIGHTS. The indemnification and advancement of expenses
provided by this Article shall not be deemed exclusive of any other rights to
which an Indemnitee seeking indemnification or advancement of expenses may be
entitled under any law (common or statutory), agreement or vote of stockholders
or disinterested directors or otherwise, both as to action in his official
capacity and as to action in any other capacity while holding office for the
Corporation, and shall continue as to an Indemnitee who has ceased to be a
director or officer, and shall inure to the benefit of the estate, heirs,
executors and administrators of the Indemnitee. Nothing contained in this
Article shall be deemed to prohibit, and the









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Corporation is specifically authorized to enter into, agreements with officers
and directors providing indemnification rights and procedures different from
those set forth in this Article. In addition, the Corporation may, to the extent
authorized from time to time by its Board of Directors, grant indemnification
rights to other employees or agents of the Corporation or other persons serving
the Corporation and such rights may be equivalent to, or greater or less than,
those set forth in this Article.

10. PARTIAL INDEMNIFICATION. If an Indemnitee is entitled under any
provision of this Article to indemnification by the Corporation for some or a
portion of the expenses (including attorneys' fees), judgments, fines or amounts
paid in settlement actually and reasonably incurred by him or on his behalf in
connection with any action, suit, proceeding or investigation and any appeal
therefrom but not, however, for the total amount thereof, the Corporation shall
nevertheless indemnify the Indemnitee for the portion of such expenses
(including attorneys' fees), judgments, fines or amounts paid in settlement to
which the Indemnitee is entitled.

11. INSURANCE. The Corporation may purchase and maintain insurance, at
its expense, to protect itself and any director, officer, employee or agent of
the Corporation or another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan) against any expense,
liability or loss incurred by him in any such capacity, or arising out of his
status as such, whether or not the Corporation would have the power to indemnify
such person against such expense, liability or loss under the General
Corporation Law of Delaware.

12. MERGER OR CONSOLIDATION. If the Corporation is merged into or
consolidated with another corporation and the Corporation is not the surviving
corporation, the surviving corporation shall assume the obligations of the
Corporation under this Article with respect to any action, suit, proceeding or
investigation arising out of or relating to any actions, transactions or facts
occurring prior to the date of such merger or consolidation.

13. SAVINGS CLAUSE. If this Article or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Corporation shall nevertheless indemnify each Indemnitee as to any expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement in
connection with any action, suit, proceeding or investigation, whether civil,
criminal or administrative, including an action by or in the right of the
Corporation, to the fullest extent permitted by any applicable portion of this
Article that shall not have been invalidated and to the fullest extent permitted
by applicable law.

14. DEFINITIONS. Terms used herein and defined in Section 145(h) and
Section 145(i) of the General Corporation Law of Delaware shall have the
respective meanings assigned to such terms in such Section 145(h) and Section
145(i).




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15. SUBSEQUENT LEGISLATION. If the General Corporation Law of Delaware
is amended after adoption of this Article to expand further the indemnification
permitted to Indemnitees, then the Corporation shall indemnify such persons to
the fullest extent permitted by the General Corporation Law of Delaware, as so
amended.

IN WITNESS WHEREOF, IDEXX LABORATORIES, INC. has caused this

Restated Certificate to be signed by its President and attested by its Secretary
this

26th day of December, 1991.

IDEXX LABORATORIES, INC.

By: /s/David E. Shaw
----------------------------------
President


ATTEST:

/s/Gail J. Hupper
- -----------------------------
Secretary








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CERTIFICATE OF AMENDMENT
OF
CERTIFICATE OF INCORPORATION
OF
IDEXX LABORATORIES, INC.



IDEXX Laboratories, Inc., a corporation organized and existing under and

by virtue of the General Corporation Law of the State of Delaware (the

"Corporation"),

DOES HEREBY CERTIFY:

FIRST: At a meeting of the Board of Directors of the Corporation held

pursuant to notice duly given, the Board of Directors duly adopted a resolution

pursuant to Section 242 of the General Corporation Law of the State of Delaware

proposing and declaring advisable the following amendment to the Restated

Certificate of Incorporation (the "Certificate") of said Corporation.

RESOLVED: That the first paragraph of Article FOURTH of the Certificate be
amended so that, as amended, said first paragraph of Article
FOURTH shall read in its entirety as follows:

FOURTH: The aggregate number of shares which the Corporation shall have
authority to issue is 30,500,000 of which (i) 30,000,000 shares
shall be Common Stock, $0.10 par value per share ("Common
Stock"), and (ii) 500,000 shares shall be Series Preferred
Stock, $1.00 par value per share ("Series Preferred Stock").

SECOND: That the foregoing amendment to the Corporation's Certificate was

adopted by the holders of a majority of the outstanding shares of Common Stock

at a Special Meeting of Stockholders held on September 24, 1993 pursuant to

notice duly given.







IN WITNESS WHEREOF, said IDEXX Laboratories, Inc. has caused this

Certificate to be signed by John P. Deckro, its Senior Vice President, and

attested by Richard B. Thorp, its Secretary, this 24th day of September, 1993.




IDEXX LABORATORIES, INC.



By: /s/John P. Deckro
---------------------------------------
John P. Deckro
Senior Vice President - Finance,
Chief Financial Officer and Treasurer




ATTEST:

By: /s/Richard B. Thorp
----------------------------
Richard B. Thorp
Secretary



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CERTIFICATE OF AMENDMENT
OF
CERTIFICATE OF INCORPORATION
OF
IDEXX LABORATORIES, INC.



IDEXX Laboratories, Inc., a corporation organized and existing under and

by virtue of the General Corporation Law of the State of Delaware (the

"Corporation"), DOES HEREBY CERTIFY:

FIRST: At a meeting of the Board of Directors of the Corporation held

pursuant to notice duly given, the Board of Directors duly adopted a resolution

pursuant to Section 242 of the General Corporation Law of the State of Delaware

proposing and declaring advisable the following amendment to the Restated

Certificate of Incorporation, as amended (the "Certificate"), of said

Corporation:

RESOLVED: That the first paragraph of Article FOURTH of the Certificate be
amended so that, as amended, said first paragraph of Article FOURTH
shall read in its entirety as follows:

FOURTH: The aggregate number of shares which the Corporation shall
have authority to issue is 60,500,000 of which (i) 60,000,000
shares shall be Common Stock, $0.10 par value per share
("Common Stock"), and (ii) 500,000 shares shall be Series
Preferred Stock, $1.00 par value per share ("Series Preferred
Stock").

SECOND: That the foregoing amendment to the Corporation's Certificate was

adopted by the holders of a majority of the outstanding shares of Common Stock

at the Annual Meeting of Stockholders held on May 26, 1995 pursuant to notice

duly given.








IN WITNESS WHEREOF, said IDEXX Laboratories, Inc. has caused this

Certificate to be signed by David E. Shaw, its Chairman and Chief Executive

Officer, and attested by Richard B. Thorp, its Secretary, this 26th day of May,

1995.


IDEXX LABORATORIES, INC.



By: /s/David E. Shaw
-----------------------------------
David E. Shaw
Chairman and Chief Executive Officer

ATTEST:



By: /s/ Richard B. Thorp
---------------------------------
Richard B. Thorp
Secretary










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CERTIFICATE OF DESIGNATIONS

OF

SERIES A JUNIOR PARTICIPATING PREFERRED STOCK


OF

IDEXX LABORATORIES, INC.

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



IDEXX Laboratories, Inc., a corporation organized and existing under
the laws of the State of Delaware (hereinafter called the "Corporation"), hereby
certifies that the following resolution was adopted by the Board of Directors of
the Corporation at a meeting duly called and held on December 17, 1996:

RESOLVED: That pursuant to the authority granted to and vested in
the Board of Directors of this Corporation (hereinafter called the "Board of
Directors" or the "Board") in accordance with the provisions of the Certificate
of Incorporation, as amended, the Board of Directors hereby creates a series of
Preferred Stock, $1.00 par value per share (the "Preferred Stock"), of the
Corporation and hereby states the designation and number of shares, and fixes
the relative rights, preferences and limitations thereof as follows:

Series A Junior Participating Preferred Stock:

Section 1. DESIGNATION AND AMOUNT. The shares of such series shall
be designated as "Series A Junior Participating Preferred Stock" (the "Series A
Preferred Stock") and the number of shares constituting the Series A Preferred
Stock shall be one hundred thousand (100,000). Such number of shares may be
increased or decreased by resolution of the Board of Directors; PROVIDED, that
no decrease shall reduce the number of shares of Series A Preferred Stock to a
number less than the number of shares then outstanding plus the number of shares
reserved for issuance upon the exercise of outstanding options, rights or
warrants or upon the conversion of any outstanding securities issued by the
Corporation convertible into Series A Preferred Stock.

Section 2. Dividends and Distributions.
---------------------------

(A) Subject to the rights of the holders of any shares of any
series of Preferred Stock (or any similar stock) ranking prior and superior to
the Series A Preferred Stock with respect to dividends, the holders of shares of
Series A Preferred



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Stock, in preference to the holders of Common Stock, par value $0.10 per share
(the "Common Stock"), of the Corporation, and of any other junior stock, shall
be entitled to receive, when, as and if declared by the Board of Directors out
of funds of the Corporation legally available for the payment of dividends,
quarterly dividends payable in cash on the last day of each fiscal quarter of
the Corporation in each year (each such date being referred to herein as a
"Quarterly Dividend Payment Date"), commencing on the first Quarterly Dividend
Payment Date after the first issuance of a share or fraction of a share of
Series A Preferred Stock, in an amount per share (rounded to the nearest cent)
equal to the greater of (a) $10 or (b) subject to the provision for adjustment
hereinafter set forth, 1,000 times the aggregate per share amount of all cash
dividends, and 1,000 times the aggregate per share amount (payable in kind) of
all non-cash dividends or other distributions, other than a dividend payable in
shares of Common Stock or a subdivision of the outstanding shares of Common
Stock (by reclassification or otherwise), declared on the Common Stock since the
immediately preceding Quarterly Dividend Payment Date or, with respect to the
first Quarterly Dividend Payment Date, since the first issuance of any share or
fraction of a share of Series A Preferred Stock. In the event the Corporation
shall at any time declare or pay any dividend on the Common Stock payable in
shares of Common Stock, or effect a subdivision, combination or consolidation of
the outstanding shares of Common Stock (by reclassification or otherwise than by
payment of a dividend in shares of Common Stock) into a greater or lesser number
of shares of Common Stock, then in each such case the amount to which holders of
shares of Series A Preferred Stock were entitled immediately prior to such event
under clause (b) of the preceding sentence shall be adjusted by multiplying such
amount by a fraction, the numerator of which is the number of shares of Common
Stock outstanding immediately after such event and the denominator of which is
the number of shares of Common Stock that were outstanding immediately prior to
such event. In the event the Corporation shall at any time declare or pay any
dividend on the Series A Preferred Stock payable in shares of Series A Preferred
Stock, or effect a subdivision, combination or consolidation of the outstanding
shares of Series A Preferred Stock (by reclassification or otherwise than by
payment of a dividend in shares of Series A Preferred Stock) into a greater or
lesser number of shares of Series A Preferred Stock, then in each such case the
amount to which holders of shares of Series A Preferred Stock were entitled
immediately prior to such event under clause (b) of the first sentence of this
Section 2(A) shall be adjusted by multiplying such amount by a fraction, the
numerator of which is the number of shares of Series A Preferred Stock that were
outstanding immediately prior to such event and the denominator of which is the
number of shares of Series A Preferred Stock outstanding immediately after such
event.

(B) The Corporation shall declare a dividend or distribution on
the Series A Preferred Stock as provided in paragraph (A) of this Section
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock) and the Corporation
shall pay such dividend or



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distribution on the Series A Preferred Stock before the dividend or distribution
declared on the Common Stock is paid or set apart; provided that, in the event
no dividend or distribution shall have been declared on the Common Stock during
the period between any Quarterly Dividend Payment Date and the next subsequent
Quarterly Dividend Payment Date, a dividend of $10 per share on the Series A
Preferred Stock shall nevertheless be payable on such subsequent Quarterly
Dividend Payment Date.

(C) Dividends shall begin to accrue and be cumulative on
outstanding shares of Series A Preferred Stock from the Quarterly Dividend
Payment Date next preceding the date of issue of such shares, unless the date of
issue of such shares is prior to the record date for the first Quarterly
Dividend Payment Date, in which case dividends on such shares shall begin to
accrue from the date of issue of such shares, or unless the date of issue is a
Quarterly Dividend Payment Date or is a date after the record date for the
determination of holders of shares of Series A Preferred Stock entitled to
receive a quarterly dividend and before such Quarterly Dividend Payment Date, in
either of which events such dividends shall begin to accrue and be cumulative
from such Quarterly Dividend Payment Date. Accrued but unpaid dividends shall
not bear interest. Dividends paid on the shares of Series A Preferred Stock in
an amount less than the total amount of such dividends at the time accrued and
payable on such shares shall be allocated pro rata on a share-by-share basis
among all such shares at the time outstanding. The Board of Directors may fix a
record date for the determination of holders of shares of Series A Preferred
Stock entitled to receive payment of a dividend or distribution declared
thereon, which record date shall be not more than 60 days prior to the date
fixed for the payment thereof.

Section 3. VOTING RIGHTS. The holders of shares of Series A
Preferred Stock shall have the following voting rights:

(A) Subject to the provision for adjustment hereinafter set forth,
each share of Series A Preferred Stock shall entitle the holder thereof to 1,000
votes on all matters submitted to a vote of the stockholders of the Corporation.
In the event the Corporation shall at any time declare or pay any dividend on
the Common Stock payable in shares of Common Stock, or effect a subdivision,
combination or consolidation of the outstanding shares of Common Stock (by
reclassification or otherwise than by payment of a dividend in shares of Common
Stock) into a greater or lesser number of shares of Common Stock, then in each
such case the number of votes per share to which holders of shares of Series A
Preferred Stock were entitled immediately prior to such event shall be adjusted
by multiplying such number by a fraction, the numerator of which is the number
of shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event. In the event the Corporation shall
at any time declare or pay any dividend on




-3-





the Series A Preferred Stock payable in shares of Series A Preferred Stock, or
effect a subdivision, combination or consolidation of the outstanding shares of
Series A Preferred Stock (by reclassification or otherwise than by payment of a
dividend in shares of Series A Preferred Stock) into a greater or lesser number
of shares of Series A Preferred Stock, then in each such case the number of
votes per share to which holders of shares of Series A Preferred Stock were
entitled immediately prior to such event shall be adjusted by multiplying such
amount by a fraction, the numerator of which is the number of shares of Series A
Preferred Stock that were outstanding immediately prior to such event and the
denominator of which is the number of shares of Series A Preferred Stock
outstanding immediately after such event.

(B) Except as otherwise provided herein, in the Certificate of
Incorporation or by law, the holders of shares of Series A Preferred Stock and
the holders of shares of Common Stock and any other capital stock of the
Corporation having general voting rights shall vote together as one class on all
matters submitted to a vote of stockholders of the Corporation.

(C) (i) If at any time dividends on any Series A Preferred Stock
shall be in arrears in an amount equal to six quarterly dividends thereon, the
holders of the Series A Preferred Stock, voting as a separate series from all
other series of Preferred Stock and classes of capital stock, shall be entitled
to elect two members of the Board of Directors in addition to any Directors
elected by any other series, class or classes of securities and the authorized
number of Directors will automatically be increased by two. Promptly thereafter,
the Board of Directors of this Corporation shall, as soon as may be practicable,
call a special meeting of holders of Series A Preferred Stock for the purpose of
electing such members of the Board of Directors. Said special meeting shall in
any event be held within 45 days of the occurrence of such arrearage.

(ii) During any period when the holders of Series A Preferred
Stock, voting as a separate series, shall be entitled and shall have exercised
their right to elect two Directors, then and during such time as such right
continues (a) the then authorized number of Directors shall be increased by two,
and the holders of Series A Preferred Stock, voting as a separate series, shall
be entitled to elect the additional Directors so provided for, and (b) each such
additional Director shall not be a member of any existing class of the Board of
Directors, but shall serve until the next annual meeting of stockholders for the
election of Directors, or until his successor shall be elected and shall
qualify, or until his right to hold such office terminates pursuant to the
provisions of this Section 3(C).

(iii) A Director elected pursuant to the terms hereof may be
removed with or without cause by the holders of Series A Preferred Stock
entitled to vote in an election of such Director.

(iv) If, during any interval between annual meetings of
stockholders




-4-




for the election of Directors and while the holders of Series A Preferred Stock
shall be entitled to elect two Directors, there is no such Director in office by
reason of resignation, death or removal, then, promptly thereafter, the Board of
Directors shall call a special meeting of the holders of Series A Preferred
Stock for the purpose of filling such vacancy and such vacancy shall be filled
at such special meeting. Such special meeting shall in any event be held within
45 days of the occurrence of such vacancy.

(v) At such time as the arrearage is fully cured, and all
dividends accumulated and unpaid on any shares of Series A Preferred Stock
outstanding are paid, and, in addition thereto, at least one regular dividend
has been paid subsequent to curing such arrearage, the term of office of any
Director elected pursuant to this Section 3(C), or his successor, shall
automatically terminate, and the authorized number of Directors shall
automatically decrease by two, the rights of the holders of the shares of the
Series A Preferred Stock to vote as provided in this Section 3(C) shall cease,
subject to renewal from time to time upon the same terms and conditions, and the
holders of shares of the Series A Preferred Stock shall have only the limited
voting rights elsewhere herein set forth.

(D) Except as set forth herein, or as otherwise provided by law,
holders of Series A Preferred Stock shall have no special voting rights and
their consent shall not be required (except to the extent they are entitled to
vote with holders of Common Stock as set forth herein) for taking any corporate
action.



Section 4. Certain Restrictions.
--------------------

(A) Whenever quarterly dividends or other dividends or
distributions payable on the Series A Preferred Stock as provided in Section 2
are in arrears, thereafter and until all accrued and unpaid dividends and
distributions, whether or not declared, on shares of Series A Preferred Stock
outstanding shall have been paid in full, the Corporation shall not:

(i) declare or pay dividends, or make any other
distributions, on any shares of stock ranking junior (either as to dividends or
upon liquidation, dissolution or winding up) to the Series A Preferred Stock;

(ii) declare or pay dividends, or make any other
distributions, on any shares of stock ranking on a parity (either as to
dividends or upon liquidation, dissolution or winding up) with the Series A
Preferred Stock, except dividends paid ratably on the Series A Preferred Stock
and all such parity stock on which dividends are payable or in arrears in
proportion to the total amounts to which the holders of all such shares are then
entitled;




-5-





(iii) redeem or purchase or otherwise acquire for
consideration shares of any stock ranking junior (either as to dividends or upon
liquidation, dissolution or winding up) to the Series A Preferred Stock,
provided that the Corporation may at any time redeem, purchase or otherwise
acquire shares of any such junior stock in exchange for shares of any stock of
the Corporation ranking junior (either as to dividends or upon dissolution,
liquidation or winding up) to the Series A Preferred Stock; or

(iv) redeem or purchase or otherwise acquire for
consideration any shares of Series A Preferred Stock, or any shares of stock
ranking on a parity with the Series A Preferred Stock, except in accordance with
a purchase offer made in writing or by publication (as determined by the Board
of Directors) to all holders of such shares upon such terms as the Board of
Directors, after consideration of the respective annual dividend rates and other
relative rights and preferences of the respective series and classes, shall
determine in good faith will result in fair and equitable treatment among the
respective series or classes.

(B) The Corporation shall not permit any subsidiary of the
Corporation to purchase or otherwise acquire for consideration any shares of
stock of the Corporation unless the Corporation could, under paragraph (A) of
this Section 4, purchase or otherwise acquire such shares at such time and in
such manner.

Section 5. REACQUIRED SHARES. Any shares of Series A Preferred Stock
purchased or otherwise acquired by the Corporation in any manner whatsoever
shall be retired and cancelled promptly after the acquisition thereof. All such
shares shall upon their cancellation become authorized but unissued shares of
Preferred Stock and may be reissued as part of a new series of Preferred Stock
subject to the conditions and restrictions on issuance set forth herein, in the
Certificate of Incorporation, or in any other Certificate of Designations
creating a series of Preferred Stock or any similar stock or as otherwise
required by law.

Section 6. Liquidation, Dissolution or Winding Up.
--------------------------------------

(A) Upon any liquidation, dissolution or winding up of the
Corporation, no distribution shall be made (1) to the holders of shares of stock
ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series A Preferred Stock unless, prior thereto, the holders
of shares of Series A Preferred Stock shall have received $1000 per share, plus
an amount equal to accrued and unpaid dividends and distributions thereon,
whether or not declared, to the date of such payment, provided that the holders
of shares of Series A Preferred Stock shall be entitled to receive an aggregate
amount per share, subject to the provision for adjustment hereinafter set forth,
equal to 1,000 times the aggregate amount to be distributed per share to holders
of shares of Common Stock, or (2) to the holders of




-6-




shares of stock ranking on a parity (either as to dividends or upon liquidation,
dissolution or winding up) with the Series A Preferred Stock, except
distributions made ratably on the Series A Preferred Stock and all such parity
stock in proportion to the total amounts to which the holders of all such shares
are entitled upon such liquidation, dissolution or winding up.

(B) Neither the consolidation, merger or other business
combination of the Corporation with or into any other corporation nor the sale,
lease, exchange or conveyance of all or any part of the property, assets or
business of the Corporation shall be deemed to be a liquidation, dissolution or
winding up of the Corporation for purposes of this Section 6.

(C) In the event the Corporation shall at any time declare or pay
any dividend on the Common Stock payable in shares of Common Stock, or effect a
subdivision, combination or consolidation of the outstanding shares of Common
Stock (by reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the aggregate amount to which holders of shares of Series A
Preferred Stock were entitled immediately prior to such event under the proviso
in clause (1) of paragraph (A) of this Section 6 shall be adjusted by
multiplying such amount by a fraction, the numerator of which is the number of
shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event. In the event the Corporation shall
at any time declare or pay any dividend on the Series A Preferred Stock payable
in shares of Series A Preferred Stock, or effect a subdivision, combination or
consolidation of the outstanding shares of Series A Preferred Stock (by
reclassification or otherwise than by payment of a dividend in shares of Series
A Preferred Stock) into a greater or lesser number of shares of Series A
Preferred Stock, then in each such case the aggregate amount to which holders of
shares of Series A Preferred Stock were entitled immediately prior to such event
under the proviso in clause (1) of paragraph (A) of this Section 6 shall be
adjusted by multiplying such amount by a fraction, the numerator of which is the
number of shares of Series A Preferred Stock that were outstanding immediately
prior to such event and the denominator of which is the number of shares of
Series A Preferred Stock outstanding immediately after such event.

Section 7. CONSOLIDATION, MERGER, ETC. Notwithstanding anything to
the contrary contained herein, in case the Corporation shall enter into any
consolidation, merger, combination or other transaction in which the shares of
Common Stock are exchanged for or changed into other stock or securities, cash
and/or any other property, then in any such case each share of Series A
Preferred Stock shall at the same time be similarly exchanged or changed into an
amount per share, subject to the provision for adjustment hereinafter set forth,
equal to 1,000 times the aggregate amount of stock, securities, cash and/or any
other property (payable in kind), as the



-7-




case may be, into which or for which each share of Common Stock is changed or
exchanged. In the event the Corporation shall at any time declare or pay any
dividend on the Common Stock payable in shares of Common Stock, or effect a
subdivision, combination or consolidation of the outstanding shares of Common
Stock (by reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock, then
in each such case the amount set forth in the preceding sentence with respect to
the exchange or change of shares of Series A Preferred Stock shall be adjusted
by multiplying such amount by a fraction, the numerator of which is the number
of shares of Common Stock outstanding immediately after such event and the
denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event. In the event the Corporation shall
at any time declare or pay any dividend on the Series A Preferred Stock payable
in shares of Series A Preferred Stock, or effect a subdivision, combination or
consolidation of the outstanding shares of Series A Preferred Stock (by
reclassification or otherwise than by payment of a dividend in shares of Series
A Preferred Stock) into a greater or lesser number of shares of Series A
Preferred Stock, then in each such case the amount set forth in the first
sentence of this Section 7 with respect to the exchange or change of shares of
Series A Preferred Stock shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of shares of Series A Preferred
Stock that were outstanding immediately prior to such event and the denominator
of which is the number of shares of Series A Preferred Stock outstanding
immediately after such event.

Section 8. NO REDEMPTION. The shares of Series A Preferred Stock
shall not be redeemable.

Section 9. RANK. The Series A Preferred Stock shall rank, with
respect to the payment of dividends and the distribution of assets, junior to
all series of any other class of the Preferred Stock issued either before or
after the issuance of the Series A Preferred Stock, unless the terms of any such
series shall provide otherwise.

Section 10. AMENDMENT. At such time as any shares of Series A
Preferred Stock are outstanding, the Certificate of Incorporation, as amended,
of the Corporation shall not be amended in any manner which would materially
alter or change the powers, preferences or special rights of the Series A
Preferred Stock so as to affect them adversely without the affirmative vote of
the holders of at least two-thirds of the outstanding shares of Series A
Preferred Stock, voting together as a single class.

Section 11. FRACTIONAL SHARES. Series A Preferred Stock may be
issued in fractions of a share which shall entitle the holder, in proportion to
such holder's



-8-



fractional shares, to exercise voting rights, receive dividends, participate in
distributions and have the benefit of all other rights of holders of Series A
Preferred Stock.

IN WITNESS WHEREOF, this Certificate of Designations is executed on
behalf of the Corporation by its Chairman of the Board this 17th day of
December, 1996.

IDEXX LABORATORIES, INC.


By: /s/David E. Shaw
------------------------------
Chairman of the Board






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