This book, translated from the French, will no doubt prove a useful addition to the numerous ones already disseminating knowledge in the field of sexology. The different chapters are distinctly uneven in quality. The one on 'Sexuality in Children' states that until recently it was thought that children had no sexual life, but that now we all know that they do, the author, however, does not mention that this important change in medical knowledge was brought about by one man—Freud. The words 'incest' and 'Oedipus complex' do not occur in the chapter, but some account is given of pregenital functioning. One chapter is headed 'Love is no longer a Mystery', the explanation being given that the choice of mate is determined in the unconscious: those more familiar with the unconscious mind cannot hardly assert that the process is thereby deprived of mystery. The book contains a full Index and some vivid pictures of the genital apparatus in both sexes, which should leave the reader in no doubt at least about the anatomical aspects of the problem.