1. For brief review of literature see Quastel, J. H., Anesthesia and Analgesia, 31, 151 (1952).
2. Larrabee, M. G., “Biology of Mental Health and Disease”;, 384 (P. B. Hoeber, Inc., 1952). Larrabee, M. G., Ramos, J. G., and Bulbring, E., Fed. Proc., 9, 75 (1950).
3. Bronk, D. W., and Brink, F., Fed. Proc., 10, 19 (1951).
4. Eiler, J. J., and McEwen, W. K., Arch. Biochem., 20, 163 (1949).
5. Brody, T. M., and Bain, J. A., Proc. Soc. Exp. Biol. Med., 77, 50 (1951).