. Applied physiology : including the effects of alcohol and narcotics . itingthem off makes themworse. They should be cut off close to the skin with asharp knife. Sucking the fingers, or biting the nails, islikely to cause these hangnails. Dirt under the ends of the finger nails is not only untidy,but may be poisonous. The nails themselves are not poi-sonous, but the filth which they carry may contain germsof sickness. So we ought to keep our nails 200. Hair. — Little tubes of epithelium from the epi-dermis reach into the derma, and as fast as their cellsgrow they are matted together i
. Applied physiology : including the effects of alcohol and narcotics . itingthem off makes themworse. They should be cut off close to the skin with asharp knife. Sucking the fingers, or biting the nails, islikely to cause these hangnails. Dirt under the ends of the finger nails is not only untidy,but may be poisonous. The nails themselves are not poi-sonous, but the filth which they carry may contain germsof sickness. So we ought to keep our nails 200. Hair. — Little tubes of epithelium from the epi-dermis reach into the derma, and as fast as their cellsgrow they are matted together into a string called a new cells are always forming, the old ones are pushedout, and so the hair grows. When a hair is pulled out,the cells lining the tube keep on growing and soon makea new hair. Fine hair covers nearly all the body, but uponthe head and upon mens faces, it grows long. A nail (x 200). a surface of the nail. b body of the nail. c epithelial cells just before they are welded into a growing epithelium. THE SKIN AND KIDXKVS IO/. .~ _/> At the roots of the hair are the openings of small glands,which make an oily substance. This oils the hair andskin, and makes it soft and glossy. Each hair has a littlemuscle, which can pull upon the hair so as to make itstand air makesthe little musclesact, and pullsthe hairs of thebody straightup, so that theirroots form littlepoints above theflesh. We callthese pointsgoose flesh.\ 201. Care ofthe hair. — Theshort hair ofthe body seemsto be an aid infeeling. Thehair of the headgrows long forornament andprotection. A healthy person produces enough oily sub-stance to keep the hair soft and glossy. If the hair isbrushed so as to keep it clean and to spread the oil overit, it will look well without using hair oil or powder. Onthe other hand, most hair oils and restoratives containsubstances which are harmful. Hair dyes are still morepoisonous. They never make the hair look natural,and the
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