Three water molecules and a heavier molecular weight. -----Original Message----- From: JCarpenter764 <@t> aol.com [mailto:JCarpenter764 <@t> aol.com] Sent: Mon 10/27/2003 8:32 AM To: histonet <@t> lists.utsouthwestern.edu Cc: Subject: [Histonet] (no subject) what is the difference between the anhydrous compound and the trihydrate compound?