1. Cowgill, G. R.:J. A. M. A., 110:805, 1938; 111:1009, 1938; 113: 2146, 1939.
2. Chattergee, D. D.:Indian J. Med. Res., 23:191, 1935.
3. Williams, E. F., Abramowitz, E. W. and Killian, J. A.:J Lab and Clin. Med., 19:1213, 1934.
4. Loewe, S. and Hubacher, M.:Arch. Internat, de Pharmacodyn., 65:297, 1941.
5. Loewe, S.:J. Am. Pharmaceut. Ass’n., 28:427, 1939.