. The Ontario public school hygiene . creased blood-flow nourishes thegrowing point and promotes a vigorous growth of hair. The other kind of nerve fibre carries messages fromthe root to the brain, so that even when any very lightthing touches a hair we know it almost at once inasmuchas these minute nerve fibres are very sensitive. Wemay conclude, therefore, that while the use of ordinaryhair and whiskers is to protect the head, face, and neck,the use of the hair on the body is to act as an organ oftouch. In the case of the hairy Ainos, however, upon whom the hair growsthick and long, its usei
. The Ontario public school hygiene . creased blood-flow nourishes thegrowing point and promotes a vigorous growth of hair. The other kind of nerve fibre carries messages fromthe root to the brain, so that even when any very lightthing touches a hair we know it almost at once inasmuchas these minute nerve fibres are very sensitive. Wemay conclude, therefore, that while the use of ordinaryhair and whiskers is to protect the head, face, and neck,the use of the hair on the body is to act as an organ oftouch. In the case of the hairy Ainos, however, upon whom the hair growsthick and long, its useis evidently to protectthe body from the coldin winter and from theheat in summer. Hair begins to turngray first upon thetemples. In mostpeople, gray hairs showthemselves at about— forty years of people, however,turn gray about twenty-five, and others notuntil fifty-five or sixty. The cause of gray hairs is thefailure of the growing point to form the colouring matterwhich gives colour to the hair. At forty-five or fifty the. Figure 26.—Hairy Aino. (From Wiedersheims Structure of Man mission of Mactnillan & Co., London.) By per- HAIR 63 hair begins to fall out, and thenceforward it is never sothick as in early life. The change in colour and thicknessmarks a gradual loss of bodily strength, not merely inthe skin but in the whole body. When a man is sixtyyears of age, white thin hair tells him as plainly aswords can that his bodily powers have begun to fail. The colour of a mans hair, its coarseness or fineness,the fact of its falling out early in life or turning gray atthirty or thirty-five years of age, are all generallyexplained by saying that he inherits these peculiaritiesfrom parents or near relatives. But whether a man isdescended from a gray-haired or a bald-headed family ornot, he should take great care of his hair. No hair tonic can be applied and no rules can befollowed which will prevent hair from turning gray;but by washing the hair weekly or fortnightly,
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