“…Many reviews have been published onprotozoandrug resistance (Schnitzer, 1932;Schnitzer & Grunberg, 1957;Bishop, 1959;Schnitzer, 1963a,b). None of them is able to give even a slight indication of the surprising developments of recent years, although some of these a r e mentioned in short supplementary notes published in Vol, IV of Experimental Chemotherapy ' (Hawking, 1966;Hill, 1966;Joyner et al, 1966).…”