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 . , through which the blood cir-culates, and the smallest of these tubes are con-nected at one end with exceedingly minute cavi-ties in the bone, in each of which lies a little cell,which does the work of nourishing, repairing, and enlarging the bone(Fig. 7). Thus wesee that, even in sohard and firm a tis-sue as bone, whathas been said
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 . , through which the blood cir-culates, and the smallest of these tubes are con-nected at one end with exceedingly minute cavi-ties in the bone, in each of which lies a little cell,which does the work of nourishing, repairing, and enlarging the bone(Fig. 7). Thus wesee that, even in sohard and firm a tis-sue as bone, whathas been said aboutcells holds are the reallife of the bone;they separate fromthe blood the neces-sary material anddeposit it aroundthemselves, some-what as a crab re-news his shell eve-ry year after get-ting rid of the Uses of the Periosteum.—It has long beenknown that, when the periosteum is severely bruisedand separated from the bone by violence, the por-tion of bone deprived of the periosteum dies andhas to be removed from the bodv. It is also foundthat a portion of bone, or even an entire bone, maybe removed from the bodv, and if it be carefullydone, so as to leave the periosteum in its place, thebone will grow again. A remarkable example of. Fig, 7.—Cross-section of bone, small black spots are the caWties iawhich the bone-cells live. The fine linesare canals through which the plasma (sec-tion 122) of the blood passes. The largeholes are for blood-vessels. 16 ORGANS OF MOTION. this was a case operated upon by the late Dr. JamesR. Wood, of New York. In a young woman, whoselower jawbone had become dead and caused hergreat suffering, this distinguished surgeon removedthe whole jaw, leaving the* periosteum and even theteeth, held in their places by an apparatus made forthe purpose. The entire bone grew again, and theteeth became fixed in it as it grew. The persondied several years afterward, and her skull, show-ing the result of this wonderful operat
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