This edition is based on the U. S. P. XIII, N.F. VIII, N.N.R., 1947, and the British Pharmacopoeia, 1932, and its addenda. The significant change in editorial policy is the enlargement of that portion of each monograph devoted to a discussion of therapeutic uses and dosage of drugs, and an increased emphasis placed upon precautions to be observed during drug administration. Another new feature is the inclusion of the name of the manufacturer or distributor whose trade name or trade mark of the drug being discussed. It contains complete medical and pharmaceutical information of every drug used in medicine.