1. Gaddum, J. H., Peart, W. S., and Vogt, M., J. Physiol., 108, 467 (1949).
2. Greeff, K., and Holtz, P., Arch. Intern. Pharmacodyn., 88, 228 (1951).
3. Rudzik, A. D., and Miller, J. W., J. Pharmacol. Exp. Therap., 138, 82 (1962).
4. Oskarsson, V., Acta Endocrinol., 34, 38 (1960).
5. Rudzik, A. D., and Miller, J. W., J. Pharmacol. Exp. Therap., 138, 88 (1962).