PROCEPT INC
SC 13D/A, 1998-09-10
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3)*

                                  Procept, Inc.
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
                         (Title of Class of Securities)

                                  742 683 10 5
                                 (CUSIP Number)

                    Paramount Capital Asset Management, Inc.
                         c/o Lindsay A. Rosenwald, M.D.
                               787 Seventh Avenue
                               New York, NY 10019
                                 (212) 554-4300

                                 with a copy to:

  Michael S. Weiss, Esq.                              Monica C. Lord, Esq.
  Paramount Capital Asset                     Kramer, Levin, Naftalis & Frankel
    Management, Inc.                                    919 Third Avenue
  787 Seventh Avenue                                   New York, NY  10022  
   New York, NY 10019                                     (212) 715-9100    
    (212) 554-4372 

(Name,  Address and Telephone Number of Person Authorized to Receive Notices and
Communications)

                                 August 10, 1998
             (Date of Event which Requires Filing of this Statement)

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

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule 13d- 1(a) for other  parties to whom copies are to be
sent.

*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
disclosures provided in a prior cover page.

The information required on 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).


                               Page 1 of 10 pages


<PAGE>

CUSIP No. 742 683 10 5                 13 D                   Page 2 of 10 Pages
- --------------------------------------------------------------------------------
1)       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Paramount Capital Asset Management, Inc.
- --------------------------------------------------------------------------------
2)       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)     [ ]

                                                              (b)     [ ]
- --------------------------------------------------------------------------------
3)       SEC USE ONLY

- --------------------------------------------------------------------------------
4)       SOURCE OF FUNDS*
         00 (see Item 3 below)
- --------------------------------------------------------------------------------
5)       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEM 2(d) OR 2(e)
                                                                       [_]
- --------------------------------------------------------------------------------
6)       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      None
         NUMBER                -------------------------------------------------
         OF                    8)     SHARED VOTING POWER
         SHARES                       2,789,206**
         BENEFICIALLY          -------------------------------------------------
         OWNED BY              9)     SOLE DISPOSITIVE POWER
         EACH                         None
         REPORTING             -------------------------------------------------
         PERSON                10)    SHARED DISPOSITIVE POWER
         WITH                         2,789,206**

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

         2,789,206**
- --------------------------------------------------------------------------------
12)      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES                                                    [ ]

- --------------------------------------------------------------------------------
13)      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         55.7%

- --------------------------------------------------------------------------------
14)      TYPE OF REPORTING PERSON
         CO
- --------------------------------------------------------------------------------



** Consists of (i) 1,341,680 shares of Common Stock which are presently votable,
and (ii)  1,447,526  shares of Common Stock  issuable upon exercise of warrants,
which, accordingly, are not presently votable.


<PAGE>

CUSIP No. 742 683 10 5                  13 D                 Page 3 of 10 Pages
- --------------------------------------------------------------------------------
1)       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Aries Domestic Fund, L.P.
- --------------------------------------------------------------------------------
2)       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)     [ ]

                                                              (b)     [ ]
- --------------------------------------------------------------------------------
3)       SEC USE ONLY

- --------------------------------------------------------------------------------
4)       SOURCE OF FUNDS*
         00 (see Item 3 below)
- --------------------------------------------------------------------------------
5)       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEM 2(d) OR 2(e)
                                                                       [_]
- --------------------------------------------------------------------------------
6)       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      None
         NUMBER                -------------------------------------------------
         OF                    8)     SHARED VOTING POWER
         SHARES                       953,930**
         BENEFICIALLY          -------------------------------------------------
         OWNED BY              9)     SOLE DISPOSITIVE POWER
         EACH                         None
         REPORTING             -------------------------------------------------
         PERSON                10)    SHARED DISPOSITIVE POWER
         WITH                         953,930**

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

         953,930**
- --------------------------------------------------------------------------------
12)      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES                                                    [ ]

- --------------------------------------------------------------------------------
13)      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         19.1%

- --------------------------------------------------------------------------------
14)      TYPE OF REPORTING PERSON
         PN
- --------------------------------------------------------------------------------

** Consists of (i) 459,588  shares of Common Stock which are presently  votable,
and (ii) 494,342  shares of Common  Stock  issuable  upon  exercise of warrants,
which, accordingly, are not presently votable.


<PAGE>

CUSIP No. 742 683 10 5                  13 D                 Page 4 of  10 Pages
- --------------------------------------------------------------------------------
1)       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         The Aries Trust
- --------------------------------------------------------------------------------
2)       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)     [ ]

                                                              (b)     [ ]
- --------------------------------------------------------------------------------
3)       SEC USE ONLY

- --------------------------------------------------------------------------------
4)       SOURCE OF FUNDS*
         00 (see Item 3 below)
- --------------------------------------------------------------------------------
5)       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEM 2(d) OR 2(e)
                                                                       [_]
- --------------------------------------------------------------------------------
6)       CITIZENSHIP OR PLACE OF ORGANIZATION
         Cayman Islands
- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      None
         NUMBER                -------------------------------------------------
         OF                    8)     SHARED VOTING POWER
         SHARES                       1,835,276**
         BENEFICIALLY          -------------------------------------------------
         OWNED BY              9)     SOLE DISPOSITIVE POWER
         EACH                         None
         REPORTING             -------------------------------------------------
         PERSON                10)    SHARED DISPOSITIVE POWER
         WITH                         1,835,276**

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

         1,835,276**
- --------------------------------------------------------------------------------
12)      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES                                                    [ ]

- --------------------------------------------------------------------------------
13)      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         36.7%

- --------------------------------------------------------------------------------
14)      TYPE OF REPORTING PERSON
         OO (see Item 2)
- --------------------------------------------------------------------------------

** Consists of (i) 882,920  shares of Common Stock which are presently  votable,
and (ii) 953,184  shares of Common  Stock  issuable  upon  exercise of warrants,
which, accordingly, are not presently votable.


<PAGE>

CUSIP No. 742 683 10 5                  13 D                 Page 5 of  10 Pages
- --------------------------------------------------------------------------------
1)       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Lindsay A. Rosenwald, M.D.
- --------------------------------------------------------------------------------
2)       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)     [ ]

                                                              (b)     [ ]
- --------------------------------------------------------------------------------
3)       SEC USE ONLY

- --------------------------------------------------------------------------------
4)       SOURCE OF FUNDS*
         00 (see Item 3 below)
- --------------------------------------------------------------------------------
5)       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEM 2(d) OR 2(e)
                                                                       [_]
- --------------------------------------------------------------------------------
6)       CITIZENSHIP OR PLACE OF ORGANIZATION
         United States
- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      557,689
         NUMBER                -------------------------------------------------
         OF                    8)     SHARED VOTING POWER
         SHARES                       2,789,206**
         BENEFICIALLY          -------------------------------------------------
         OWNED BY              9)     SOLE DISPOSITIVE POWER
         EACH                         557,689
         REPORTING             -------------------------------------------------
         PERSON                10)    SHARED DISPOSITIVE POWER
         WITH                         2,789,206**

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

         3,346,895**
- --------------------------------------------------------------------------------
12)      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES                                                    [ ]

- --------------------------------------------------------------------------------
13)      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         66.8%

- --------------------------------------------------------------------------------
14)      TYPE OF REPORTING PERSON
         IN
- --------------------------------------------------------------------------------


** Consists of (i) 1,341,680 shares of Common Stock which are presently votable,
and (ii)  2,005,215  shares of Common Stock  issuable upon exercise of warrants,
which, accordingly, are not presently votable.


<PAGE>

CUSIP No. 742 683 10 5                  13 D                 Page 6 of  10 Pages
- --------------------------------------------------------------------------------
1)       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Mr. Michael S. Weiss
- --------------------------------------------------------------------------------
2)       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)     [ ]

                                                              (b)     [ ]
- --------------------------------------------------------------------------------
3)       SEC USE ONLY

- --------------------------------------------------------------------------------
4)       SOURCE OF FUNDS*
         PF (see Item 3)
- --------------------------------------------------------------------------------
5)       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEM 2(d) OR 2(e)
                                                                       [_]
- --------------------------------------------------------------------------------
6)       CITIZENSHIP OR PLACE OF ORGANIZATION
         United States
- --------------------------------------------------------------------------------
                               7)     SOLE VOTING POWER
                                      26,796
         NUMBER                -------------------------------------------------
         OF                    8)     SHARED VOTING POWER
         SHARES                       128,350**
         BENEFICIALLY          -------------------------------------------------
         OWNED BY              9)     SOLE DISPOSITIVE POWER
         EACH                         26,796
         REPORTING             -------------------------------------------------
         PERSON                10)    SHARED DISPOSITIVE POWER
         WITH                         128,350**

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

         155,146**
- --------------------------------------------------------------------------------
12)      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
         SHARES                                                    [ ]

- --------------------------------------------------------------------------------
13)      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         5.0%

- --------------------------------------------------------------------------------
14)      TYPE OF REPORTING PERSON
         IN
- --------------------------------------------------------------------------------


** Includes 64,175 shares of Common Stock and Class C Warrants to puchase 64,175
shares of Common Stock, in each case, issuable upon exercise of Advisory Options
held by Hawkins Group,  LLC, a limited  liability  company of which Mr. Weiss is
the managing member.


<PAGE>



                                  SCHEDULE 13D


         This  Amendment  No. 3 (the  "Amendment")  amends and  supplements  the
following Items of the Reporting  Persons' Statement on Schedule 13D, dated July
10, 1997, as amended (the  "Schedule").  All amounts  reported in this Amendment
have been adjusted and all amounts  previously  reported should be adjusted,  as
necessary,  to reflect the one-for-ten  reverse split of the Common Stock of the
Issuer which became effective June 1, 1998. 

ITEM 2.  IDENTITY AND BACKGROUND.

                  The information  contained in Item 2 to the Schedule is hereby
amended and supplemented to read in its entirety as follows:

               (a)  This statement is filed on behalf of Paramount Capital Asset
                    Management, Inc. ("Paramount Capital"), Aries Domestic Fund,
                    L.P.  ("Aries  Domestic"),  The Aries Trust ("Aries Trust"),
                    Dr. Lindsay A. Rosenwald  (together with Paramount  Capital,
                    Aries  Domestic  and  Aries  Trust,   the  "Aries  Reporting
                    Persons") and Mr. Michael S. Weiss  (together with the Aries
                    Reporting  Persons,  the  "Filing  Persons").  See  attached
                    Exhibit S which is a copy of their  agreement  in writing to
                    file this  statement  jointly on behalf of each of them. Mr.
                    Weiss and the Aries  Reporting  Persons have made,  and will
                    continue  to  make,  their  own  investment  decisions.  The
                    investment  decisions  of Mr.  Weiss may or may not coincide
                    with the decisions made by the Aries Reporting Persons. Each
                    Filing Person expressly disclaims Mr. Weiss' membership in a
                    "group" with the Aries Reporting  Persons within the meaning
                    of Rule 13d-5(b)(1) of the Securities  Exchange Act of 1934,
                    as amended.

               (b)  The business address of Paramount  Capital,  Aries Domestic,
                    Dr.  Rosenwald  and Mr.  Weiss is 787 Seventh  Avenue,  48th
                    Floor,  New York, New York,  10019. The business address for
                    Aries Trust is c/o MeesPierson  (Cayman)  Limited,  P.O. Box
                    2003,  British  American  Centre,  Phase 3, Dr. Roy's Drive,
                    George Town, Grand Cayman.

               (c)  Dr. Rosenwald is an investment banker,  venture  capitalist,
                    fund manager and sole shareholder of Paramount Capital,/1/ a
                    Subchapter  S  corporation  incorporated  in  the  State  of
                    Delaware.  Paramount Capital is the General Partner of Aries
                    Domestic,/2/ a limited partnership incorporated in Delaware.
                    Paramount  Capital  is the  Investment  Manager to The Aries
                    Trust,/3/  a Cayman  Islands  Trust.  Mr.  Weiss is a Senior
                    Managing Director of Paramount  Capital,  Inc. and also is a
                    member of the Issuer's Board of Directors.

- --------

/1/  Please see Exhibit B indicating  the  executive  officers and  directors of
     Paramount Capital and providing information called for by Items 2-6 of this
     statement  as  to  said  officers  and  directors.   Exhibit  B  is  herein
     incorporated by reference.

/2/  Please see Exhibit C indicating  the general  partner of Aries Domestic and
     the general  partner's  executive  officers  and  directors  and  providing
     information  called for by Items 2-6 of this  statement  as to said general
     partners,  officers  and  directors.  Exhibit C is herein  incorporated  by
     reference.

/3/  Please see Exhibit D indicating the  investment  manager of the Aries Trust
     and the investment manager's executive officers and directors and providing
     information called for by Items 2-6 of this statement as to said investment
     manager and officers and  directors.  Exhibit D is herein  incorporated  by
     reference.

                               Page 7 of 10 Pages

<PAGE>

               (d)  Dr. Rosenwald,  Mr. Weiss, Paramount Capital, Aries Domestic
                    and Aries Trust and their  respective  officers,  directors,
                    general  partners,  investment  managers,  and trustees have
                    not,  during the five years prior to the date  hereof,  been
                    convicted  in  a  criminal  proceeding   (excluding  traffic
                    violations or similar misdemeanors).

               (e)  Dr. Rosenwald,  Mr. Weiss, Paramount Capital, Aries Domestic
                    and Aries Trust and their  respective  officers,  directors,
                    general partners, investment managers, and trustees have not
                    been,  during  the five  years  prior  to the  date  hereof,
                    parties   to  a   civil   proceeding   of  a   judicial   or
                    administrative body of competent  jurisdiction,  as a result
                    of which such person was or is subject to a judgment, decree
                    or  final  order   enjoining   future   violations   of,  or
                    prohibiting or mandating  activities  subject to, Federal or
                    State  securities laws or finding any violation with respect
                    to such laws.

               (f)  Dr.  Rosenwald  and Mr.  Weiss are  citizens  of the  United
                    States.


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         The  information  contained in Item 3 to the Schedule is hereby amended
and supplemented by adding the following:

         Pursuant to the Placement Agency  Agreement and the Financial  Advisory
Agreement (see Item 6),  Paramount  Capital,  Inc.  designated  recipients  (the
"Paramount Option  Designees") of the Placement Options and Advisory Options (as
defined below).  Aries Trust,  Aries Domestic,  Dr. Rosenwald and Mr. Weiss were
among the Paramount  Option  Designees and each received such Placement  Options
and/or  Advisory  Options in  connection  with the Private  Placement  for which
Paramount  Capital,  Inc. acted as placement agent (see Item 6). Aries Trust was
designated the recipient of Placement Options to purchase units consisting of an
aggregate of (i) 33,500  shares of Common Stock and Class C Warrants to purchase
33,500 shares of Common Stock.  Aries  Domestic was  designated the recipient of
Placement  Options to purchase  units  consisting  of an aggregate of (i) 16,500
shares of Common  Stock and (ii) Class C Warrants to purchase  16,500  shares of
Common Stock. Dr. Rosenwald was designated the recipient of Placement Options to
purchase units consisting of an aggregate of (i) approximately  59,337 shares of
Common Stock and (ii) Class C Warrants to purchase  approximately  59,337 shares
of Common Stock and was designated the recipient of Advisory Options to purchase
units  consisting of an aggregate of (i) 219,507 shares of Common Stock and (ii)
Class C Warrants to  purchase  219,507  shares of Common  Stock.  Mr.  Weiss was
designated the recipient of Placement Options to purchase units consisting of an
aggregate of (i)  approximately  13,398  shares of Common Stock and (ii) Class C
Warrants to purchase  approximately  13,398 shares of Common Stock and a limited
liability  company of which Mr. Weiss is the managing  member was designated the
recipient  of Advisory  Options to purchase an  aggregate  of (i)  approximately
64,175   shares  of  Common   Stock  and  (ii)  Class  C  Warrants  to  purchase
approximately  64,175 shares of Common Stock. The Placement Options and Advisory
Options become exercisable on October 9, 1998

                               page 8 of 10 pages

<PAGE>

ITEM 5.  INTEREST IN SECURITIES OF ISSUER.

         The  information  contained in Item 5 to the Schedule is hereby amended
and supplemented to read in its entirety as follows:

               (a)  As  of  September  1,  1998:  Dr.  Rosenwald,  as  the  sole
                    shareholder  of  Paramount  Capital  and  as the  holder  of
                    Placement  Options  and  Advisory  Options,  may  be  deemed
                    beneficially to own approximately  3,346,895 shares or 66.8%
                    of the Issuer's Common Stock; Paramount Capital, through the
                    acquisitions   of   securities  by  Aries  Trust  and  Aries
                    Domestic, may be deemed beneficially to own 2,789,206 shares
                    or 55.7% of the Issuer's  Common Stock;  and Aries Domestic,
                    Aries Trust and Mr. Weiss may be deemed  beneficially to own
                    the following numbers of shares of Common Stock:


                    Aries Domestic            953,930
                    Aries Trust               1,835,276
                    Michael S. Weiss          155,146

                    Pursuant  to Rule  13d-4  promulgated  under the  Securities
                    Exchange  Act  of  1934,  as  amended,  the  Filing  Persons
                    disclaim beneficial ownership of all the Common Stock except
                    the respective  Purchased Common Stock actually held by such
                    Filing Person.

               (b)  Dr. Rosenwald and Paramount  Capital share the power to vote
                    or  to  direct  the  vote,  to  dispose  or  to  direct  the
                    disposition  of those shares owned by each of Aries Domestic
                    and Aries Trust. Dr. Rosenwald has the sole power to vote or
                    to  direct  the  vote  and  to  dispose  or  to  direct  the
                    disposition of the shares  underlying the Placement  Options
                    and  Advisory  Options  held by him.  Mr. Weiss has the sole
                    power to vote or to  direct  the vote and to  dispose  or to
                    direct  the   disposition  of  the  shares   underlying  the
                    Placement  Options  held by him,  and Mr.  Weiss has  shared
                    power to vote or to  direct  the vote and to  dispose  or to
                    direct the  disposition of the Advisory  Options held by the
                    limited  liability  company  of  which  he is  the  managing
                    member.

               (c)  The Filing Persons have not engaged in any  transactions  in
                    the Common  Stock of the Issuer in the past 60 days,  except
                    to the extent that the  Placement  Options and the  Advisory
                    Options  becoming   exerciseable   within  60  days  can  be
                    considered a transaction.

               (d)  & (e) Not applicable.  

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS

                  The information  contained in Item 7 to the Schedule is hereby
amended by adding the following Exhibit:

         Exhibit S:                 Agreement of Joint Filing of Schedule 13D.



                               page 9 of 10 pages


<PAGE>

                                   SIGNATURES

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

                                 PARAMOUNT CAPITAL ASSET MANAGEMENT, INC.

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.
                                      President

                                 ARIES DOMESTIC FUND, L.P.
                                 By: Paramount Capital Asset Management, Inc.
                                       General Partner

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.
                                      President


                                 THE ARIES TRUST
                                 By: Paramount Capital Asset Management, Inc.
                                       Investment Manager

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.
                                      President

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.

Dated:   September 9, 1998
         New York, NY            By: /s/ Michael S. Weiss
                                    -----------------------------------------
                                      Michael S. Weiss


                               page 10 of 10 pages

<PAGE>

                                    EXHIBIT S

                                    AGREEMENT

                          JOINT FILING OF SCHEDULE 13D

                  The  undersigned  hereby agree  jointly to prepare and to file
with  regulatory  authorities a Schedule 13D and any future  amendments  thereto
reporting each of the undersigned's ownership of securities of Procept Inc., and
hereby  affirm  that such  Schedule  13D is being filed on behalf of each of the
undersigned.

                                 PARAMOUNT CAPITAL ASSET MANAGEMENT, INC.

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.
                                      President

                                 ARIES DOMESTIC FUND, L.P.
                                 By: Paramount Capital Asset Management, Inc.
                                       General Partner

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.
                                      President


                                 THE ARIES TRUST
                                 By: Paramount Capital Asset Management, Inc.
                                       Investment Manager

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.
                                      President

Dated:   September 9, 1998
         New York, NY            By: /s/ Lindsay A. Rosenwald, M.D.
                                    -----------------------------------------
                                      Lindsay A. Rosenwald, M.D.

Dated:   September 9, 1998
         New York, NY            By: /s/ Michael S. Weiss
                                    -----------------------------------------
                                      Michael S. Weiss




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