EXHIBIT 3.24

                             VIVENTIA BIOTECH INC.

                             DEMAND PROMISSORY NOTE


Date: March 23, 2005

     FOR VALUE RECEIVED the undersigned hereby unconditionally promises to pay
on demand to the order of Clairmark Investments Ltd., in lawful money of Canada,
the amount of TWO MILLION SIX HUNDRED THOUSAND DOLLARS ($2,600,000) and
interest thereon. Interest shall accrue on a basis which is equal four and
one-half percent (4.5%) per annum, calculated on the basis of a 365-day year
and actual days elapse, and compounded annually.

     This note may be prepaid in full or in part at any time without penalty.

     Payments of principal and interest hereunder must be made at such other
location as may be notified by Leslie Dan to the undersigned.

     The undersigned waives presentment for payment, notice of non-payment,
protest and notice of protest of this promissory note and diligence in
collection or bringing suit.

     This promissory note shall be governed by and construed in accordance with
the laws of the Province of Ontario.

                                          VIVENTIA BIOTECH INC.


                                          by:    /s/ Michael Byrne
                                              --------------------------------
                                              Name:  Michael Byrne
                                              Title: Chief Financial Officer
                                                     and Secretary