This edition is revised in accordance with the second supplement of the United States Pharmacopeia. As in the case of previous editions, it is prepared by a special committee of the Council on Pharmacy and Chemistry and is published under the authorization of that council. All the official preparations are listed, along with an evaluation of their usefulness or uselessness in modern therapeutics. Asterisks indicate those items which, in the opinion of the Council, deserve sufficient recognition to be included in the latest edition of Useful Drugs. Unlike Useful Drugs, this volume does not deal with any but the official preparations. The various official drugs are listed alphabetically, according to their Latin names, and the official preparations of those drugs listed thereunder in each case. The extensive index is based principally on the English names of the official drugs. This edition deserves the popularity enjoyed by the previous editions.