2. That each visible character is due to the cooeperative action of an
indefinitely large number of factors; conversely, that each of these
factors affects an indefinitely large number of characters.
APPENDIX E
USEFUL WORKS OF REFERENCE
The most complete bibliography is that published by the State Board of
Charities of the State of New York (_Eugenics and Social Welfare
Bulletin_ No. III, pp. 130, Albany, 1913).
An interesting historical review of eugenics, with critical comments on
the literature and a bibliography of 100 titles, was published by A. E.
Hamilton in the _Pedagogical Seminary_, Vol. XXI, pp. 28-61, March,
1914.
Much of the important literature of eugenics has been mentioned in
footnotes. For convenience, a few of the books which are likely to be
most useful to the student are here listed:
GENETICS AND EUGENICS, by W. E. Castle. Harvard University
Press, Cambridge, 1916.
HEREDITY AND ENVIRONMENT IN THE DEVELOPMENT OF MEN, by Edwin G.
Conklin. Princeton University Press, 1915.
HEREDITY IN RELATION TO EUGENICS, by C. B. Davenport, Henry
Holt and Co., New York, 1911.
ESSAYS IN EUGENICS, by Francis Galton. Eugenics Education
Society, London, 1909.
BEING WELL-BORN, by Michael F.
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