The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . ll look precisely alike, except- simplest form of living matter, and makes up the only part of all ani-mal and vegetable bodies which shows signs of life. 8 IN TROD UCTION. ing that the dead one is motionless. A living cell,minute as it is, frequently possesses the power ofindependent motion, or at least is able to changeits form (Fi
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . ll look precisely alike, except- simplest form of living matter, and makes up the only part of all ani-mal and vegetable bodies which shows signs of life. 8 IN TROD UCTION. ing that the dead one is motionless. A living cell,minute as it is, frequently possesses the power ofindependent motion, or at least is able to changeits form (Fig. 4). It also can take up nourishmentinto its mass, and can propagate itself. The move-ments of the cell can bebeautifully seen in thewhite cells of the blood,which will be describedhereafter. 8. Growth of Cells.—A cell propagates itself inseveral ways; one of themost common is by divid-ing into two parts. Thisoperation has been oftenwatched under the micro-scope by skilled observers. The change is seen tobegin in the nucleus, and, as that divides by a linethrough its center, the protoplasm of the cell ar-ranges itself in halves around each part of the nu-cleus, its surface dipping in toward the center,until finally the approaching surfaces meet and the. Fig. 4.—White cells in motion.
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