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This is Monograph No. 2 of the Mental Measurement Series of which Boody's study of the children of immigrants at Ellis Island was the first. Like the former it is a thoroughgoing study and singularly free from the prejudice that has marked so many of our studies of the intelligence of racial groups in America. The author outlines his purpose as “in general … to investigate the effect of past immigration, as made up of different nationality groups, upon the mental capacity of the present American population and to consider the implication of the findings for a scientific immigration policy.” In approaching his subject he discusses (he nature of intelligence and the possibility of measuring it and concludes that “given (control of the environmental factors) intelligence tests give a rough classification of individuals as to probable achievement in appropriation and advancement of culture, and that the average success of groups in this respect may be quite accurately foretold.” The second chapter deals at some length with studies of immigrant intelligence, and discusses the relative rǒle of nature and nurture in determining achievement on mental tests. Since practically all investigations show a correspondence between the results of mental tests and the frequency of mental defect (the latter principally due to heredity) the author believes that achievement on mental tests in general may be regarded as largely determined by heredity. The conclusion that “in general the representatives of the newer immigration, especially the Latins, have less intelligence than the Americans or those of the older immigrant stock,” he regards as only tentative, and it must stand or fall with further evidence, it being very probable that the groups of lower intelligence are considerably handicapped by unfavorable