. Human physiology : designed for colleges and the higher classes in schools, and for general reading. VerticalSECTION OF A T00TII. 182 HUMAN PHYSIOLOGY. How teeth nre different from bones, and by the microscope is represented in Fig. 66 and 67, in thechapter on Cell-Life. I have been thus particular in thedescription of the parts of a tooth, that you may see howcompound even so apparently simple a part of the body three different structures in it are built by cells, and thecells of each part select from the blood such constituents asare needed for their purpose. 282. A tooth diff
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. VerticalSECTION OF A T00TII. 182 HUMAN PHYSIOLOGY. How teeth nre different from bones, and by the microscope is represented in Fig. 66 and 67, in thechapter on Cell-Life. I have been thus particular in thedescription of the parts of a tooth, that you may see howcompound even so apparently simple a part of the body three different structures in it are built by cells, and thecells of each part select from the blood such constituents asare needed for their purpose. 282. A tooth differs from a common bone in one import-ant particular—when once formed it is never altered in itssize. A bone grows with the growth of other parts of thebody ; but a tooth, when it first protrudes through the gum isas large as it ever will be. The reason of this is, that sohard a substance as enamel can not be made changeable asbone is. Its hardness is inconsistent with any thing like cir-culation in it, and without circulation there can be no the enamel were not needed, and the teeth could be com-posed only of dentine, they could grow as other bones if they could grow, one s
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