Summary: | individual blood properties A, B, and M, N, the most striking deviations from other races were found in American Indians, Eskimos, Australian aborigines, and Ainus. 1 Since material from American Indians was available to us, it was considered of interest to study this with regard to the incidence of the Rh factor. Materials and Methods The clotted blood samples obtained by venepuncture at Fort Lewis, Washington, were shipped at once by air mail to New York City, where they arrived in good condition. These specimens came from Indian patients at the Tacoma Hospital and Indian soldiers stationed at Fort Lewis. The Indians from which the samples were obtained fall into ten different linguistic groups with the exception of a few individuals. (This classification is based on the ethnological charts of linguistic stocks in Wissler's "The American Indian, " 1938 edition, supplemented by information obtained from Dr. J. H. Hendry, Superintendent
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