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Schwesinger and Osborn believe that methods of measuring psychologic characteristics have been worked out sufficiently to make possible objective scientific research on the problem of heredity and environment, and that with constantly improving technics a solid body of knowledge on the subject will soon be achieved. They have therefore prepared an outline of the present knowledge on this subject and a reference book for future work. It is an excellent summary of the present status of the problem.
The first sections describe the tests by which intelligence and personality traits may be estimated and represent a timely survey not only for the student of eugenics but for all psychologists or psychiatrists who face the practical problems of judging intelligence and personality characteristics. It need hardly be noted here that studies of intelligence are more fully developed than studies of personality. In the chapter "Measurement of Personality" Schwesinger points out the