人類に於けるM及びN型質の進化に關する一考察

抄録

The MN blood type distributions of the Japanese, Koreans and Mongolians are approximately M-type 30%, N-type 20% and MN-type 50%, with the Formosans and Micronesians showing similar results.
The results of the examinations of the MN blood type of 337 Ainus living in the Piratori district in Hidaka province, Hokkaido by this author in the summer of 1951 made clear the fact that compared to the surrounding races the N-type was quite high (37.4%).
Formerly, the Eskimos, American Indians, Rwala Bedouins and Alaskan Indians were considered as tribes with high rates of M-types, while the Australian aborigines and Papuans showed extremely high rates of N-types. The fact that these races are relatively unmixed and are also uncivilized is of great interest.
Thus, from the fact that the races with extremely high rates of M- and N-types exist, it may be surmised that M-type races and N-type races co-existed in the ancestry of human races. Also as above stated, it may be said that the races which have overwhelmingly high rates of M- or N-types are ideally most closely connected with the basic primitive races.