After animadverting in his preface on the spate of superfluous books on sex the author proceeds to add one more. It is of the familiar class of those whose writer subscribes to the odd belief that an adequate knowledge of anatomy and embryology qualifies him to unravel the most subtle of human problems, namely those concerning the relations between the sexual impulse and the mind. Such writers have, it is true, the advantage of simple views. Thus on the first page of his preface he announces that: 'We have got rid of the ridiculous notion that sexuality is essentially immoral.' How easy it all seems. No wonder that the author is able to deal with the baffling problem of masturbation at puberty by merely