. First book in physiology and hygiene . ittle bits of coloring matter, called pig- — 107 — SWEAT HAIR merit. This pigment is different in different persons;some have light complexions and some have is different in different races of people: in theskin of white persons, there is very little pigment;in that of Indians the pigment is of a reddish, orcopper, color; in the skin of negroes, it is the pigment is not evenly spread out on theunder surface of thescarf skin, but lies inpatches, the skinlooks freckled. The True Skin.—It is the inner skinthat does the workof carrying o
. First book in physiology and hygiene . ittle bits of coloring matter, called pig- — 107 — SWEAT HAIR merit. This pigment is different in different persons;some have light complexions and some have is different in different races of people: in theskin of white persons, there is very little pigment;in that of Indians the pigment is of a reddish, orcopper, color; in the skin of negroes, it is the pigment is not evenly spread out on theunder surface of thescarf skin, but lies inpatches, the skinlooks freckled. The True Skin.—It is the inner skinthat does the workof carrying out wastematter. It is calledthe true skin. It isthicker and softerthan the outer skin,just as the inner bark of a young tree is thickerand softer than the outer bark. If a needle pricksthis inner skin, drops of blood appear; for it isfilled with little blood vessels, just as the innerbark of the tree is filled with little tubes of , too, pricking causes pain; for the true skincontains httle nerves, bv which we feel. In the. GLANDS KAIRBULB SCARF SKINOR EPI-DERMIS TRUE SKINORDERMIS — 108 — mi 1 « ! v! « I ■«1 A- iiMM-ftt^A^.^ deeper portions of the skin are two kinds of sacs,or glands—the sweat glands and the oil glands. The Sweat Glands and Pores.—If you look at thepalm of your hand, you will see not only manycoarse hnes, but also many fine ridges. If you look at these fine ridgesthrough a magnifyingglass, you will see alongeach ridge a number oflittle dark spots. Eachof these is the mouthof a stveat tube thatruns in through thetrue skin. The innerend of the sweat tubeis coiled up into a knot, called the siveat outer end is called a pore. The sweat glands are all the time taking fromthe blood water that is filled with waste passes through the sweat tubes and out of thepores, and spreads out and dries on the surface ofthe skin. Xow you see why we should drink agreat deal of water. The body must have plenty ofhquid in which to carr
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