Manual of human histology . ot quite normal formationsare the interglobular spaces in the dentine itself (fig. 188). Czermak has con-ferred this nameupon certain veryirregular cavities,bounded by globularprocesses of the den-t. tine, which are,it maybe said, never entirelyabsent in the the crown theyare found most fre-quently in the neigh-bourhood of the enamel, and often form a thin curved layer, ex-tending along its whole inner surface, which, upon close exami-nation, is seen to be composed of a multitude of thin layers, re-ceiving the ends of the contour lines (fig. 187). They also
Manual of human histology . ot quite normal formationsare the interglobular spaces in the dentine itself (fig. 188). Czermak has con-ferred this nameupon certain veryirregular cavities,bounded by globularprocesses of the den-t. tine, which are,it maybe said, never entirelyabsent in the the crown theyare found most fre-quently in the neigh-bourhood of the enamel, and often form a thin curved layer, ex-tending along its whole inner surface, which, upon close exami-nation, is seen to be composed of a multitude of thin layers, re-ceiving the ends of the contour lines (fig. 187). They also occur,however, more internally, but always in longitudinal sections, inlines which correspond with the contour lines. The spaces aresometimes very wide, intersecting or interrupting in theircourse many dentinal canals; sometimes they are very small,so that only a few canals are touched by them. In the formercase, their limits are formed by distinct globular projectionsof 0*002—0012 and more, which are pierced by dentinal. Fig. 188. A morsel of dentine with dentinal globules and interglobular spacesfilled with air between them, x 350. long before drawn attention to these peculiar striae. In his admirable memoir, pub-lished in Miillers Archiv, for 1837, he says, p. 507, In the incisor teeth of thehorse, also, many less transparent striae running parallel with the cavitaspulpa maybe seen, like the annual rings in the trunk of a tree. They proceeded in this case,however, not merely from certain parallel flexures of the tubes, but especially fromsimilar calcareous cells, which had accumulated in one zone for the greatest part ofthe length of the tooth. Tab. xxii, fig. 3. See also his explanation of the zonesin the Elephants tooth, at pp. 510-11.—Eds.] THE TEETH. 47 canals, and have precisely the same aspect as the dentine,of which they arc obviously nothing but portions ; whilst inthe latter, such dentinal globules, as I will term them, are notalways distinct. This is especiall
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