This Catholic text book on psychiatry has been prepared by two professors of that faith who are in high standing in their profession. Catholic leaders have been conducting a running battle for some time with psychiatrists and psychoanalysts. In this book there is a frank recognition that a purely negative attitude is unsatisfactory. The book rejects the materialistic philosophy which underlies most of the psychiatry of today. At the same time it presents in a factual and scientific manner the contribution to be made to the problem of mental disturbance by abnormal psychology, mental hygiene and psychiatry. It is a book designed primarily for students in Catholic universities, but others interested in this field will find it of interest as an example of how, in the Catholic philosophy of life, the techniques of this relatively new science can be utilized.