One of the most striking results of the War has been the great arousing of attention to the appalling ignorance on the most vitally important of human questions. Practically all scientific authority in now agreed  as to the need for the competent study of the psychological problems of Matrimony and for the instruction in the hygiene of wedlock and the ethics of sex. This is a well considered and reliable book for those seeking the essential knowledge which points the way to harmonius conjugal life.