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Dr. Kallmann began this important work under Professor Rudin at the German Research Institute for Psychiatry in Munich. The material was gathered in Berlin in 1929, but the coordination of data and the assembly of the book had to be postponed several years, since political developments in Germany closed to him the possibility of completing his research there. The authors insist that the field must be considered an exclusively medical problem dealing only with biologic facts. It should not be confused by philosophic considerations or complicated by political speculations and prejudices. Pretexts advanced against eugenic prophylaxis are palpably insincere in a population which already practices birth control extensively for economic and social reasons.
The total group of families in the study embraced the kin of all schizophrenic patients admitted to a hospital in Berlin between 1893 and 1902 whose clinical records were still available in 1929. Altogether it covered 1,087