Dr. H. H. Laughlin, of the Psychological Laboratory of the Municipal Court of Chicago, has devoted several years to the study of this question, and has recently published the result of his researches in a book entitled "Eugenical Sterilization in the United States." He publishes the texts of all the laws past and present, gives his idea of a model sterilization law, together with the necessary forms for putting it into effect. He also deals with the physiological and mental effects of sexual sterilization. A reviewer of his book, writing in the _Journal of Heredity_ of October, 1923, states forcibly the case for the opponents of sterilization. He expresses the opinion that "The release of sterilized individuals with feeble inhibitions or anti-social tendencies is the equivalent to the creation of so-many new and virulent foci of venereal diseases and promiscuity." Furthermore, the Central Association for Mental Welfare of Great Britain, which was formed in 1913 to act as a co-ordinating and representative body on all questions affecting mental defectives and their relations to the community, not long ago referred the question to their standing Medical Committee, who gave the considered opinion that "sterilization at the present time is not a practical proposition." The Committee of the Central Association being in complete agreement with this view, the Association decided not to advocate the policy of sterilization, because they consider that it would have only a limited influence in preventing the increase of mental deficiency, that it would be attended with certain harmful results in other directions, and because its adoption is impracticable. The Association's statement on this subject goes on to say: "It is very important to remember that although propagation by defectives is one of the causes of mental deficiency, nevertheless this is by no means the only social menace attaching to their presence in the community. If left unguided and unprotected, their lack of stability and control may lead them to commit serious crime, such as theft, arson, assault, and even murder. Their inability to maintain economic independence results in vagrancy and destitution. Their helplessness in the face of obstacles frequently brings about their complete collapse at the first rebuff which they have to meet. The interest of the community can only be adequately protected by the segregation of a considerable proportion of these persons in suitable institutions. A sterilized defective would not be any less liable to these happenings than would one who was unsterilized. A defective woman, from the fact of her being sterilized and incapable of bearing children, would be more prone to illicit intercourse, to adopt a life of prostitution, and to spread venereal disease. It follows that segregation would still be needed in the case of a very large proportion of defectives, but, if they are segregated, sterilization is unnecessary.