The Diego factor among Asiatic Indians. Apaches and West African Negroes: blood types of Asiatic Indians and Apaches.

The apparent restriction of the Diego blood factor to the Mongoloid peoples (Leyrisse and Arends, ’56) has provided the anthropologist with a tool of great potential usefulness in the evaluation of populations of mixed origin. In order to use this system to its full advantage, it is necessary to have considerable information on groups whose origin can with considerable certainty be labelled “mongolian” or “nonmongolian.” The present study, undertaken as a contribution towards expanding knowledge of the distribution of the Diego system, is concerned with the findings in 75 Asiatic Indians, 108 American Apache Indians, and 775 West African Negroes.