This volume of Dr. Richards' is well worth careful study by pediatricians. Every thoughtful practitioner must recognize that physicians in general have done relatively little in the way of cooperation with psychiatrists who are struggling with the problems of mental hygiene. Dr. Richards is one of the psychiatrists who knows how to make clear statements without sacrificing either dignity or truth. This volume is refreshingly free from mysticism or sentimentalism. The author is just as tired of the jargon of much of the mixed up literature as any of the rest of the medical profession. To any pediatrician who wants to find a good statement of the whole situation, this book is unreservedly recommended.