Conclusions
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1.
Identical twins are equal in inheritance.
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2.
The study of the incidence of mental disorders in identical twins may be an aid in the determination of causal factors, and in distinguishing hereditary from environmental factors.
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3.
Dementia præcox or manic-depressive psychosis rarely occurs in only one of a pair of identical twins.
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Bibliography
New York Medical Journal, Dec. 21, 1912.
Newman, H. R., 1917. University of Chicago Press.
Newman, H. R., Feb., 1932. Scientific Monthly.
Siemens, H. W., 1924. Die Zwillingspathologie, Berlin.
Journal of Heredity, 1919, 1922, 1923.
Wilson and Wolfsohn, Arch. Neur. and Psych., March. 1929.
Archard. Med. Herald, Physical Ther. and Endocrine Survey, Nov. 1931.
Halbertsma. Am. Jour. Dis. Childhood, May, 1923.
Frantz, M. H. Jour. Nerv. and Ment. Dis., Oct., 1919.
Parker, G. H. Jour. Nery. and ment. Dis., Feb., 1926. Parker, G. H., Jour. of Heredity, April, 1926.
Newell, Am. Journal of Orthopsychiatry, Oct., 1930.
Rosanoff, A. J. Jour. of Juvenile Research, Oct. 1931.
Rosanoff, A. J., and I. A. California and Western Medicine, August, 1932.
Johnson, D. Jour. of Nerv. and Ment. Dis., July, 1925.
Murray, G. R. Lancet. Mar. 14, 1925.
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Merriman, W.E. Psychoses in identical twins. Psych Quar 7, 37–49 (1933). https://doi.org/10.1007/BF01572716
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DOI: https://doi.org/10.1007/BF01572716