The Preventive Detention Prison on the Isle of Wight had been running but a few months when the report was prepared. Little can be said about it as yet. The idea is not novel, but “advanced.” Following the serving of a sentence for a specific crime, the more professional or habitual criminal may be sentenced to from five to ten years of subsequent preventive detention in a prison with privileges of limited association with other prisoners: in short, a custodial treatment of the criminal who is dangerous to society because of his profession or his nature. Many other interesting features are dealt with in this report of Sir Evelyn Ruggles-Brise and his colleagues; much that our American prison boards and wardens cannot afford to miss. O. F. LEWIS. ADMISSION TO AMERICAN TRADE UNIONS By F. WOLFE, Ph.D. Johns Hopkins Press. 181 pp. $1.00 paper, $1.25 cloth; by mail of THE SURVEY $1.08 and $1.33. SOCIAL PROGRESS IN CONTEMPORARY EUROPE By FREDERICK A. OGG. The Macmillan Company. 384 pp. Price $1.50; by mail of THE SURVEY $1.61. Admission to American Trade Unions is a retrospective study brought up to the present of the methods by which American trade unions control the number and quality of their membership, through their regulations in regard to apprenticeship, competency, admission of women, aliens and Negroes, and the expulsion of members. The conclusions which the writer draws from his study are colorless, but the book presents a wealth of facts, particularly in the footnote references and quotations from primary sources. * * * * * Professor Ogg’s review of the movements, which almost within the memory of men now living have transformed the social aspect of Europe, is not profound nor original and does not undertake to interpret these movements. It is, however, a useful reference book of facts, the more so since the author supplements his short accounts of the various movements by bibliographies of the matter covered in each chapter. The subject matter, which is carried practically up-to-date, covers political and industrial changes, the condition of the agricultural population and of the wage-earner, labor organization and politics, and the efforts of governments to improve the condition of the lower classes. MARY BROWN SUMNER. BOOKS RECEIVED IN MARCH PSYCHOLOGY AND INDUSTRIAL EFFICIENCY. By Hugo Munsterberg. Houghton Mifflin Co. 320 pp. Price $1.50; by mail of THE SURVEY $1.62. COMRADE YETTA. By Albert Edwards. The Macmillan Co. 448 pp. Price $1.35; by mail of THE SURVEY $1.47. THE MORAL EDUCATION OF SCHOOL CHILDREN. By Charles Keen Taylor, M.A. Charles K. Taylor, Publ. 77 pp. Price by mail of THE SURVEY $.75. THE OLD LAW AND THE NEW ORDER. By George W. Alger. Houghton Mifflin Co. 295 pp. Price $1.25; by mail of THE SURVEY $1.35.