Hypochondriacal Syndromes

weightless state. As the authors note, information in this area has not been generally available. They include a brief and timely account of the available data and there are references to more detailed reviews of studies in aerospace performance. This volume is a valuable reference source and it will be of particular interest to investigators in the fields of psychology, experimental neurology, aerospace medicine and education. It provides biological information of value to workers in human engineering, but engineers will not find a mathematical approach in this text. There are, however, some references to engineering literature. The bibliography of more than 80 pages, by itself, is worth the price of the volume. The style of this text is more consistent with a review monograph than it is with an expository account, but both styles are interwoven throughout.