TISCHER and Dörfel1, and Doery2, have identified adenosine, adenosine 3'-phosphate and a guanine compound in snake venoms. In this communication, which supplements the earlier report2, the guanine compound and two additional purines are identified in the venom of Notechis scutatus as guanosine, inosine and hypoxanthine, respectively. The earlier arguments favouring the existence of the three purine compounds as natural constituents of fresh venom are now substantiated in the identification of adenosine, adenosine 3'-phosphate and guanosine in a perchloric acid extract of freshly ejected venom.