Prepared for the Use of Physicians Under Authorization of the Council on Pharmacy and Chemistry of the American Medical Association by a Committee Consisting of the Following: A.W. Hewlett, M.D. , Professor of Medicine, Leland Stanford Junior University. Torald Sollmann, M.D. , Professor of Pharmacology and Materia Medica, Medical Department, Western Reserve University. M.I. Wilbert, Ph.M., Phar.D. , Assistant in the Division of Pharmacology, Hygienic Laboratory, U.S. Public Health Service. W.A.