1. Harrison, J. W. E., Packman, E. W., and Abbott, D. D., J. Amer. Pharm. Assoc., 48, 50 (1959).
2. Truitt, E. B., and Morgan, Ann M., Arch. Intern. Pharmacodyn., 135, 105 (1962).
3. Levy, G., J. Pharm. Sci., 50, 388 (1961).
4. Cummings, A. J., Martin, B. K., and Wiggins, L. F., J. Pharm. Pharmacol. (in the press).