UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934

                                 Amendment No. 1

                               Pharmacopoeia Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    71713B104
                                  (CUSIP Number)

                                February 15, 2001

             (Date of Event Which Requires Filing of this Statement)


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ ]      Rule 13d-1(b)

[x]      Rule 13d-1(c)

[ ]      Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).





CUSIP No. 71713B104

               1.   Names of Reporting Persons or I.R.S. Identification Nos. of
                    above persons (entities only)

                    Corning Incorporated
                    I.R.S. Identification No.:  16-0393470

               2.   Check the Appropriate Box if a Member of a Group (See
                    Instructions)

                    [ ] (a)
                    [ ] (b)

               3.   SEC Use Only

               4.   Citizenship or Place of Organization

               5.   Sole Voting Power _______
Number of
Shares         6.   Shared Voting Power _______
Beneficially
Owned by       7.   Sole Dispositive Power _______
Each Reporting
Person With    8.   Shared Dispositive Power _______

               9.   Aggregate Amount Beneficially Owned by Each Reporting
                    Person _______

               10.  Check if the Aggregate Amount in Row (9) Excludes Certain
                    Shares (See Instructions) _______

               11.  Percent of Class Represented by Amount in Row (9) _______

               12.  Type of Reporting Person (See Instructions) _______




Item 1.             (a)  Issuer:  Pharmacopeia Inc.

                    (b)  Address:  CN 5350
                         Princeton, NJ  08543-5350

Item 2.             (a)  Name of Person Filing:

                         Corning Incorporated

                    (b)  Address of Principal Business Offices:

                         One Riverfront Plaza
                         Corning, New York  14831

                    (c)  Citizenship:

                         New York

                    (d)  Title of Class of Securities:

                         Common Stock

                    (e)  CUSIP Number:  71713B104

Item 3.             Not Applicable

Item 4.             Ownership

                    (a)  Amount Beneficially Owned    1,702,081

                    (b)  Percent of Class     7.3

                    (c)  Number of Shares as to Which Person Has:

                         (i)   Sole Power to Vote or Direct the Vote  1,702,081

                         (ii)  Shared Power to Vote or Direct the Vote  ______

                         (iii) Sole Power to Dispose or Direct the
                               Disposition of  1,702,081

                         (iv)  Shared Power to Dispose or Direct the
                               Disposition of _____




Item 5.             Ownership of Five Percent or Less of a Class.

                    Not Applicable

Item 6.             Ownership of More than Five Percent on Behalf of Another
                    Person.

                    Not Applicable

Item 7.             Identification and Classification of the Subsidiary Which
                    Acquired the Security Being Reported on by the Parent
                    Holding Company.

                    Not Applicable

Item 8.             Identification and Classification of Members of the Group.

                    Not Applicable

Item 9.             Notice of Dissolution of Group.

                    Not Applicable

Item 10.            Certification.

                    By signing below I certify that, to the best of my knowledge
                    and belief, the securities referred to above were not
                    acquired and are not held for the purpose of or with the
                    effect of changing or influencing the control of the issuer
                    of the securities and were not acquired and are not held in
                    connection with or as a participant in any transaction
                    having that purpose or effect.


                                    SIGNATURE

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Date:     February 21, 2001

                                   CORNING INCORPORATED

                                   By:      /s/ A. John Peck, Jr.
                                          ------------------------------------
                                   Name:    A. John Peck, Jr.
                                   Title:   Sr. Vice President and Secretary