毛髮ノ強力及ビ伸展性ニ關スル研究 : 第3編 異常,屍體,外國人及ビ邦人各部位ニ於ケル毛髮ノ強力及ビ伸展性
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概要
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The author measured, in the case of the subjects given in the above title, the absolute strength and the elongation of a single untreated hair at the root part of the hair-shaft with L. Schopper's Yarn Tester. The test conditions were the same as given in Part I. The experiments resulted in the following conclusions. 1) The absolute strength, the stress and the elongation percentage of the head hair of curly Japanese were samaller than those of normal Japnese hair. 2) The strength of the head hairs of African negros Living in Ethiopia was smaller than that of normal Japanese hair, while the elongation percentage was about the same. 3) The absolute strength of the head and pubic hair of Japanese, when grown grey, was greater than that of ordinary black hair, while the stress and the elongation percentage were smaller. 4) It was found that the absolute strength of the various segments of a single hair having white, greyish-white, grey and black segments was greatest at the grey part and smallest at the black part, while the stress and the elongation percentage were just the contrary. 5) The absolute strength and the stress of the regenerated greyish-white hair in cases of alopecia areata of the head were smaller than the unaffected head hair of the same person. The elongation percentage, however, showed but little variation. 6) The absolute strength and the stress of the hair of a verminous head containing many nits were a little smaller than when the same person's head hadnormal hair, while the elongation pecentage was the reverse, being greater. 7) The charged strength, the stress and the elongation percentage of axillary hair attacked by trichomycosis palmellina were much smaller than the unattacked axillary hair of the same person. 8) abslute strength and the elongation percentage of the head hair of Englishmen, Frenchmen and Americans as studied by the author were smaller than those of Japanese, whereas the stress was much greater. Among the hair of various tints of foreign people, the absolute strength of brunette hair was the greatest, that of blond and reddish hair medium, that of silver and silver-grey hair the smallest. The stress of blond and reddish hair was the greatest, black hair medium and silver, and silver-grey hair the smallest. As for the elongation percentage, there were no remarkable differences. 9) It was observed that the charged strength of the head hair of dead bodies was greater, in cases of chronic diseases, than in those of acute diseases, while the stress and the elongation percentage were exactly the reverse. 10) With regard to the absolute strength of the hair of healthy Japanese, the pubic hair was found to be the strongest, the hair of the head the next, the axillary hair the third and the hair of the leg the weakest. As far as the stress and the elongation percentage were concerned, they differed but little. 11) When the examination was mede in the case of the same person, the absolute strength, the stress and the elongation percentage of the hair were nearly always practically the same for any of the different regions of the head.
- 京都府立医科大学の論文
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