“…Pollia (326) made intraperitoneal injections of lard, acacia, and sesame oil, and of retene and 1 : 2 : 5 : 6-dibenzanthracene in sesame oil or in acacia, in rats bearing a grafted sarcoma. The growth of the tumour was inhibited in every instance by 1 :2 :5 :6-dibenzanthracene, and to a less extent by retene also. ''…”