1. Haddow, A., and Timmis, G. M., Lancet, i, 207 (1953).
2. For the references see the reviews by Philips, F. S., Pharmacol. Rev., 2, 281 (1950), and Ross, W. C. J., “Advances in Cancer Research”, 1, 397 (Acad. Press, New York, 1953).
3. Boursnell, J. C., Cohen, J. A., Dixon, M., Francis, G. E., Greville, G. D., Needham, D. M., and Wormall, A., Biochem. J., 40, 756 (1946).
4. Craig, A. W., and Jackson, H., Biochem. J., 58, xxxiii (1954).
5. Goldenthal, E. I., Nadkarni, M. V., and Smith, P. K., Proc. Amer. Assoc. for Cancer Research, 2, 110 (1956).