1. D. Slaughter andD. W. Nunsell, J. Pharmacol. exper. Therap.68, 104 (1940).
2. L. Cook, G. Navis, andE. J. Fellows, J. Pharmacol. exper. Therap.112, 473 (1954).
3. C. A. Winter andL. Flataker, J. Pharmacol. exper. Therap.103, 93 (1951).
4. F. Gross andH. Kaufmann, Helv. physiol. Acta12, 284 (1954).
5. J. A. Schneider, Proc. Soc. exper. Biol. Med.87, 614 (1954).