JOINT FILING AGREEMENT
This Joint Filing Agreement dated as of April 18, 1997 among Warburg,
Xxxxxx Ventures, L.P., a Delaware limited partnership; Warburg, Xxxxxx & Co., a
New York general partnership; and X.X. Xxxxxxx, Xxxxxx & Co., LLC, a New York
limited liability company (collectively, the "Reporting Entities").
W I T N E S S E T H
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WHEREAS, the Reporting Entities may be required to file a statement,
and amendments thereto, containing the information required by Schedule 13D
pursuant to Section 13(d) of the Securities Exchange Act of 1934 (the "Exchange
Act"), and Rule 13d-1 promulgated thereunder, in connection with the acquisition
of shares of common stock of Envirogen, Inc., a Delaware corporation; and
WHEREAS, pursuant to Paragraph (f) of Rule 13d-1, the undersigned
desire to satisfy any Schedule 13D filing obligation under Rule 13d-1 by a
single joint filing.
NOW, THEREFORE, in consideration of the premises, the undersigned
hereto agree as follows:
1. The undersigned agree that any Statement on Schedule 13D to which
this Agreement is attached, and any Amendments to such Statement, are filed on
behalf of each one of them.
2. This Agreement may be executed in any number of counterparts and all
of such counterparts taken together shall be deemed to constitute one and the
same instrument.
IN WITNESS WHEREOF, the undersigned have caused this Agreement to be
duly executed and delivered on the date above indicated.
WARBURG, XXXXXX VENTURES, L.P.
By: Warburg, Xxxxxx & Co.,
General Partner
By:/s/ Xxxxxx X. Xxxxxx
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Xxxxxx X. Xxxxxx
Partner
WARBURG, XXXXXX & CO.
By:/s/ Xxxxxx X. Xxxxxx
---------------------------
Xxxxxx X. Xxxxxx
Partner
X.X. XXXXXXX, XXXXXX & CO., LLC
By:/s/ Xxxxxx X. Xxxxxx
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Xxxxxx X. Xxxxxx
Member
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