The author of these volumes faces the difficult task of making his views on love and sexuality clear without being tedious or didactic by shaping his material in the form of letters. This method is, in sufficiently competent hands, one of the best, because the author can emphasize important points without losing grip of details and can by the graciousness of his personality effect a transference in the reader which may at times prove invaluable in the early stages of the exposition through inducing a tolerance of half-explained features which will be cleared up later. Groddeck, for example, has in his Buch vom Es combined exposition with genial persuasion in masterly fashion, but all of the letters in his book were to the same person. Groddeck's letters are a concentrated effort to attract one person to his views, and each and every reader falls a victim to his wit and penetration because the reader identifies himself with the charming lady who evokes the correspondence.

Dr. Ludwig Frank by evading didactic exposition has nothing left but