This book is comprised of papers published from the first of a proposed series of symposia dealing with the many facets of reproduction. Topics range from the familiar anatomical studies of human abortion material by Hertig, to exploration of the role of the immune response in reproduction failure. Because of the broad nature of the subject material, contributors are necessarily limited to summarizing pertinent information in a given area. As might be expected, the cytogenetic approach to study of abortions and malformations is liberally treated. The roles of steroid and protein hormones in reproduction are concisely treated. Included is a brief review of oögenesis, ovulation, and ovum transport. The book is adequately illustrated and illustrations are generally of good quality. Most contributions are accompanied by excellent reference lists. This book should have great appeal for the clinician or investigator with a special interest in problems of reproduction.