. Preventive medicine and hygiene. whether related or not, have only imbecileoffspring. Davenport states that there is no case on record where twoimbecile parents have produced normal children. Dr. H. H. Goddard, of the Training School for Feeble-Minded, atVineland, N. J., has studied the ancestry of children in the Vinelandinstitution and has found almost without exception a history of feeble-mindedness for several generations. Dr. Goddards remarkable study ofthe Kallikak family has already been referred to. In this instance hetraced the ancestry of a 22-year-old girl through about 1,100 indi
. Preventive medicine and hygiene. whether related or not, have only imbecileoffspring. Davenport states that there is no case on record where twoimbecile parents have produced normal children. Dr. H. H. Goddard, of the Training School for Feeble-Minded, atVineland, N. J., has studied the ancestry of children in the Vinelandinstitution and has found almost without exception a history of feeble-mindedness for several generations. Dr. Goddards remarkable study ofthe Kallikak family has already been referred to. In this instance hetraced the ancestry of a 22-year-old girl through about 1,100 individualsas far back as the Eevolutionary War. Similar studies are being carriedout in other institutions and always with similar results. The subject isfully discussed on pages 335 and 476. 514 THE HEEEDITARY TRANSMISSION OF DISEASE Insanity.—Insanity is a general term comprising many differentconditions. No general statement can, therefore, be made except thatcertain forms of insanity are undoubtedly transmitted through succes-. sive generations. It is safe to say that hereditycases of mental diseases than any other singleare rare in persons free from ancestral taint,wounds or toxic influences. is responsible for morecause. Mental diseasesexcept as the result of THE HEREDITARY TRANSMISSION OF DISEASE 515 Practically all the statistics accumulated on insanity have limitedvalue to the student of heredity, because they do not give numericalrecords of the sane members of the families of the insane. The subject isfully discussed in Chapter VI, page 331. REFERENCES Lock, R. H.: Variation, Heredity, and Evolution, 1910. Huxley, T. H.: Collected Essays, Vol. 2, 1899. Lamarck, J. B.: Philosophie Zoologique, 1809. Darwin, Chas.: The Origin of Species, 6th Edition, 1872. Weismann, A.: ? Essays Upon Heredity, 1889; The VariationTheory, 1906; The German Plasm: A Theory of Heredity (trans-lated by W. N. Parker and H. Ronnfeld, 1893). Galton, F.: Natural Inheritance, 1889; Hereditary Genius
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