The Hallucinogens attempts to provide a detailed description of the hallucinogens in a single volume. Hallucinogens are chemicals which in nontoxic doses produce changes in perception, in thought, and in mood, but which seldom produce mental confusion, memory loss, or disorientation for person, place, and time. These latter changes are characteristic of organic brain reactions following intoxications with alcohol, anesthetics, and other toxic drugs. The book covers the following hallucinogens: plant ß-phenethylamines, d-lysergic acid diethylamide, ololiuqui, indole hallucinogens derived from tryptophan, and taraxein. The discussions include their chemistry, biochemistry, and neurophysiological effects. The final chapter deals with animal studies with hallucinogenic drugs. This work has been written for chemists, biochemists, psychologists, sociologists, and research physicians. While it cannot satisfy each group fully, it is sufficiently comprehensive and well documented so that each group can use it as a springboard for future enquiry into these fascinating chemicals.