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This little monograph collects some interesting material on the pathology of twins, and devotes some space to the diseases that occur in one or both. The author thinks that the investigations in human heredity may be studied by investigating the anthropology of the race, of the family and of twins. He thinks that the latter method opens a new field for the study of human heredity. Similarity in one egg twins is not susceptible of inductive reasoning; and, in human beings, breeding experiments that would be calculated to test the progeny of twins cannot be carried out. The classification of the author is made largely on the basis of the color of the skin, hair and eyes. When this pigmentation is similar, twins tend to resemble each other in physical characteristics, and mental characteristics are likely to be dissimilar. He does not find that the papillary lines in the fingers
Die Zwillingspathologie. Ihre Bedeutung — ihre Methodik — ihre bisherigen Ergebnisse. JAMA. 1924;83(1):60. doi:10.1001/jama.1924.02660010064037
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