1. Goldacre, R. J., Loveless, A., and Ross, W. C. J., Nature, 163, 667 (1949).
2. Loveless, A., and Revell, S., Nature, 164, 938 (1949).
3. Philips, F. S., Pharmacol. Rev., 2, 281 (1950).
4. Thiersch, J. B., and Philips, F. S., J. Pharm. Exp. Therap. (in the press).
5. Lewis, M. R., and Crossley, M. L., Arch. Biochem., 26, 319 (1950).