cytotoxicity can be modulated in favor of the tumor-bearing host by activation with adjuvants such as Mycobacterium bovis, Corynebacteriumparvum and pyran copolymer (4,6, 20). Recent in vitro studies with the use of time lapse cinematography have shown that during coincubation with neoplastic cells the rate of random migration of M4 that were activated by BCG or pyran is much greater (3 to 5 ti...