Antiserums were produced in rabbits and C57 black/6Ks mice to mixed antigens of spleen, kidney, and tumor from strain A mice. Prior injections of the antiserums into C57 black/6Ks mice led to marked growth, and some takes, of two strain A tumors. These tumors normally regress in nearly 100 per cent of C57 black/6Ks mice.

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Supported in part by grants-in-aid from the National Institutes of Health, and the American Cancer Society upon recommendation of the Committee on Growth of the National Research Council, and in part by a fund in memory of Jessie K. Gault.

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