1. Tainter, M. L., Kulchar, G. and Stockton, A. B.:J. A. Pharm. As’n, 29:306, 1940.
2. Bergy, G. A.:Am. Professional Pharmacist, 5:367, 1939.
3. Flückiger and Hanbury: Pharmacographia. London, MacMillan and Co., 1874.
4. Norman, A. G.:Biochemical J., 23:524, 1925.
5. Solis-Cohen and Githens: Pharmacotherapeutics, Materia Medica and Drug Action. Appleton and Co., New York, 1928.