Abstract
Four population groups, Ibusuki, Amami Oshima, Tokunoshima and South Korea (females only) were studied as to the thickness of their parietal hair.
Five hairs each from these sebjects were made into cross sections at the height of about 1 cm from the skin surface. These cross sections were measured of their maximum and minimum diameters with the acquisition of their indices. Out of the data, arithmetic mean, sampling error and standard deviation were obtained.
The Tokunoshima group had the average longest maximum diameter (103.8μ) for males, followed by the Amami Oshima group, and the Ibusuki group in descending order. The South Korea group had the average longest maximum diameter (106.5, μ ) for females, followed by the Tokunoshima group, and the Amami Oshima group, and the Ibusuki group in descending order. In the Ibusuki and Amami Oshima groups, the females showed a significantly longer maximum diameter than the males.
Throughout the groups, there was no significant local difference in the minimum diameter for males, but only the South Korea group showed a significantly longer value in it for females than the Ibusuki group. In the Ibusuki and Amami Oshima groups the females showed a significantly longer value in the minimum diameter than the males.
The maximum and minimum diameters of these four groups proved to be among the greatest of those other groups that had been studied by the present author. The indices obtained, although they do not seem so reliable on a theoretical basis, were also among the greatest of the data so far pursued.
