I attempted the examination of the blood type of Okinawan people in order to find out the ethnological relationship between Okinawan people and the inhabitants in the other prefectures of Japan. The result, which I examined the blood type of 4, 017 persons consisting of primary school children, junior high school pupils and college students, was as follows : According to the A-B-O method for the blood type, A type covered. 39.25%; O type, 32.06; B type, 20.29%; A-B type, 8.3% The most large amount of distribution was A type, and A-B type marked the smallest distribution. Compared this datum with the examination results made by other scholars in Japan, the distribution status of the blood type completely corresponded between two research results. This coincides with the statements announced by other scholars who have been asserting that Okinawan people are ethnologically same to Japanese. The blood type examination by M-N method showed 22.80% in M type, 30.78% in N type and 46.41% in M-N type as the result which I tried the blood type examination for 621 junior high school pupils. This result, in distribution, was different from the reports by the other scholars. The number of persons examined was so small that I could not reach to the proper judgement, accordingly it would be required to do the continuous research in the future. By the R-h method, I examined 3, 369 members of groups of junior high school pupils and college students. The result of R-h (-) type 1.10% was not different conspicuously from the formerly published reports concerning the same type examination for Okinawan people. However, this result showed the difference in distribution from the reports on Japanese people's R-h blood type. This high percentage of R-h (-) in Okinawa, I conjecture, proves that racial mixture has been made between Okinawan people and the other race.
