A text-book of dental histology and embryology, including laboratory directions . of the arrangement of bone to theforce to be sustained should be constantly kept in mind. Influence of Mechanical Conditions in Evolution.—ProfessorE. D. Cope,1 in a long treatise on The Mechanical Causesof the Development of the Hard Parts in Mammals/ haselaborated the fact that the bones of the skeletons of allmammals have been influenced in their development bymechanical conditions, and that their present forms areadaptations to physical environment. In this he states,as a general principle of structure, that
A text-book of dental histology and embryology, including laboratory directions . of the arrangement of bone to theforce to be sustained should be constantly kept in mind. Influence of Mechanical Conditions in Evolution.—ProfessorE. D. Cope,1 in a long treatise on The Mechanical Causesof the Development of the Hard Parts in Mammals/ haselaborated the fact that the bones of the skeletons of allmammals have been influenced in their development bymechanical conditions, and that their present forms areadaptations to physical environment. In this he states,as a general principle of structure, that the bone is mostdense, but least in amount, on the side in the direction towardwhich forces have been exerted in development, and lessdense, but greater in amount, on the sides from which theforces have been exerted. These statements should beapplied in the study of all the sections shown. 1 Journal of Morphology, 1888. RELATION OF THE TEETH TO THE BONE 381 An old dry mandible was sawed through in the positionsindicated in the illustration (Figs. 289, 290, and 291). Fio. 289. Fig. 290
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
