Abstract
The author investigated the spinal curvature of the pure Ainu, the mixed Ainu-Japanese, and the local Japanese in the basin of the Saru River in Hokkaido, and for contrast, of the peasants in Nishifu-mura, Kitatama-gun, Tokyo. The data were obtained by measuring the curve of the tip of the spinous processes with the line-solder. Here are the results, obtained by factor analysis, on race and sex differences : 1. There are no striking differences within the same sex. 2. Between different sexes there is hardly any difference in the case of the pure Ainu, while in case of the local and the control group Japanese (Nishifu-mura peasants) there were great differences. 3. In subjects over fifty years of age, the differences are remarkable in both sexes. The intensity of curvature rises by degrees in the following order : in males-the local Japanese, mixed Ainu-Japanese, pure Ainu ; in females-pure Ainu, mixed Ainu-Japanese, Nishifu-mura peasants.
