The thesis of this book is that the psychological differences, and many of the bodily ones, between the sexes are not fundamental, but are due to sociological causes. Like Adler, therefore, the authors take up the topsy-turvy position of basing their psychology on sociology instead of vice versa. To criticise it adequately would need a book as large as itself, for it bristles with unsupported, perverted or exaggerated statements of the most dogmatic kind all of which call for detailed criticism. Of the main thesis it need only be said that it is contradicted by any observation of young children below the age at which they are subject to social influence of the kind indicated by the authors, and by the fact that the depth of penetration into the unconscious mind can be correlated with an increasingly clear differentiation between the sex differences in question.