The present volume consists of eleven rapers dealing with various aspects of the topic "Phytochemistry as Related to Disease and Medicine", which were presented at the Fourteenth Annual Meeting of the Phytochemical Society of tlorth America held tn August 1974 at Hestern Carol ina University in Cullowhee, N.C. Plant hallucinogens are the subject of the first three chapters. The first, by Schultes, reviews the occurrence of hallucinogenic agents in plants, in tabular form. Emphasis is on plants from Central and South America. The next two chapters deal with marijuana and its constituents; l'Jall discusses the chemistry and metabolism of the cannabinoids while Hoffmann and his co-workers present the results of a study of the comparative carcinogenicity of the smokes of tobacco and marijuana cigarettes. The fourth chapter, by Duke, speculates on the roles of plant chemistry in folk medicine, and utilizes the 1000 crop matrix system developed by the U.S. Department of Agriculture.