1. Brinkhous, K. M., and Graham, J. B., Blood, 9, 254 (1954).
2. The literature is extensive on the nutritional mutants. A good summary of these phenomena may be found in “Genetics and Metabolism”, Wagner, R. F., and Mitchell, H. K. (Wiley, New York, 1955).
3. Kohl, H., Deutsch. med. Wschr., 72, 279 (1947).
4. Taubmann, G., Deutsch. med. Wschr., 74, 1338 (1949).
5. Prosperi, P., and Lottini, A., Sperimentale, 100, 258 (1950).