The Dental cosmos . Fig. 13.—Tubuli from fourdifferent tusks, showingprimary and secondarycurves, a, central; b, pe-ripheral extremity. Natu-ral length. Fig. U i. Fig. 14.—Cross-section of ivory at the border of the cement, showing the wavy structure andthe alternating light and dark bands produced by it. a, stratum granulosum ; b, strata intei-lamellaria. 250/1. but that the light bands represent the lines in which the section cutsthe tubules at some angle, whereas the dark bands represent those ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 425 portions in which the section lies pa
The Dental cosmos . Fig. 13.—Tubuli from fourdifferent tusks, showingprimary and secondarycurves, a, central; b, pe-ripheral extremity. Natu-ral length. Fig. U i. Fig. 14.—Cross-section of ivory at the border of the cement, showing the wavy structure andthe alternating light and dark bands produced by it. a, stratum granulosum ; b, strata intei-lamellaria. 250/1. but that the light bands represent the lines in which the section cutsthe tubules at some angle, whereas the dark bands represent those ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 425 portions in which the section lies parallel with the tubules. This viewis also supported by the fact that the light bands show the same fig-ures by polarized light as do sections cut at right angles to the generaldirection of the tubules. The occurrence of the second series of bands, cutting those seen inFig. 14 at varying angles, and thus producing diamond-shaped,lozenge-shaped, square, and six-sided figures (see Figs. 6-8), may, Ithink, be understood by an examination of Figs. 15 and 16. In theformer we have a very slightly exaggerated picture of what may becalled the ground pattern of iv
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdentist, bookyear1890
