. First aid in illness and injury; . tissue,and opening externally by mi-croscopic twisted ducts passingthrough both the dermis and theepidermis. The former are the source of perspiration, while the latterproduce a yellow unctuous matter somewhat resembling suet, the func-tion of which is the lubrication of the surface of the body. When this sebaceous matter collects and hardens in the unclosedducts, forming a sort of plug, the external end of which is black, wehave the black heads, worms, or grubs, very commonly seen inthe skin of the face. These plugs of sebaceous matter, which assume,when s
. First aid in illness and injury; . tissue,and opening externally by mi-croscopic twisted ducts passingthrough both the dermis and theepidermis. The former are the source of perspiration, while the latterproduce a yellow unctuous matter somewhat resembling suet, the func-tion of which is the lubrication of the surface of the body. When this sebaceous matter collects and hardens in the unclosedducts, forming a sort of plug, the external end of which is black, wehave the black heads, worms, or grubs, very commonly seen inthe skin of the face. These plugs of sebaceous matter, which assume,when squeezed out, a worm-like form, with a head formed by the outerend blackened probably by dust — are not infrequently supposed bythe ignorant to be actual worms. If, however, the external orifice of the duct be closed by any acci-dent, the sebaceous matter continues to collect behind the obstruction,distending the duct in all directions until a tumor known as a wen,sometimes of considerable size, is formed. They are quite frequently. Fig. I. — Section of skin, showing itslayers and the origin of its appen-dages. THE PADDING THE FAT 5 found in the scalp, where they produce a peculiar knobby appear-ance. The excretion of waste products, particularly by the sweat glands, isessential to life, and its diminution produces poisoning of the system, asis seen in the dry skin of fevers, while its entire cessation would produceearly death. CHAPTER IITHE PADDING— THE FAT In packing into the same receptacle articles of variousshapes and sizes, some tender like ripe fruit, and others hardand stiff like blocks of wood, some sort of padding or fillingis necessary to prevent mutual injury. This function is per-formed in the bodies of man and animals by the fat whichfills in the interstices between the various parts. In addition to this, the fat serves as a reserve of nourish-ment upon which the system may draw in case of lack ofordinary means of nutrition. This function is familiar incases
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