. On the anatomy of vertebrates [electronic resource] . n known to acquire a length ofnine feet, with a basal diameter of eight inches, and to weigh onehundred and fifty pounds: but thesedimensions are rare in the Asiaticspecies. The elephant of Africa, at leastin certain localities, has large tusks //in both sexes ; and the ivory is most esteemed by the manufacturer forits density and whiteness. The molar teeth of the elephant areremarkable for their great size, andextreme complexity of their struc-ture, fig. 290. The crown, of whicha great proportion is buried in thesocket, and very little m


. On the anatomy of vertebrates [electronic resource] . n known to acquire a length ofnine feet, with a basal diameter of eight inches, and to weigh onehundred and fifty pounds: but thesedimensions are rare in the Asiaticspecies. The elephant of Africa, at leastin certain localities, has large tusks //in both sexes ; and the ivory is most esteemed by the manufacturer forits density and whiteness. The molar teeth of the elephant areremarkable for their great size, andextreme complexity of their struc-ture, fig. 290. The crown, of whicha great proportion is buried in thesocket, and very little more than thegrinding surface appears above thegum, is deeply divided into a numberof transverse perpendicular plates,consisting each of a body of den-tine, d, coated by a layer of enamelib., es and this again by the cement, ib., c, which fills the interspacesof the enamelled plates, and here more especially merits its name,since it binds together the several divisions of the crown beforethey are fully formed and united by the confluence of their bases. Section of mo 362 ANATOMY OF VERTEBRATES. 291


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