Dental cosmos . ng fibrils of the dentine. Figures of young developing den-tine, as given in Figs. 7 and 8, are against such a view. Besides this, we have, as I showed above, to regard the pulp-fibers as proto-plasmic processes of cells, which are Irom two to five times thickerthan the delicate gelatin-yielding fibrils of the dentinal ground-sub-stance. As Partsch correctly remarks, Mummery has examinedpathologically-changed human teeth, or unfavorably preserved pre-parations, and thus some of his views, which differ from ours, areexplained. It has been known for a long time that in the format
Dental cosmos . ng fibrils of the dentine. Figures of young developing den-tine, as given in Figs. 7 and 8, are against such a view. Besides this, we have, as I showed above, to regard the pulp-fibers as proto-plasmic processes of cells, which are Irom two to five times thickerthan the delicate gelatin-yielding fibrils of the dentinal ground-sub-stance. As Partsch correctly remarks, Mummery has examinedpathologically-changed human teeth, or unfavorably preserved pre-parations, and thus some of his views, which differ from ours, areexplained. It has been known for a long time that in the formation of dentinea layer of uncalcified ground-substance is first deposited, and that thedeposition of salts of lime begins only at some distance from theodontoblasts. These salts are secreted between the fibrils in the formof globular masses. I quite agree with V. v. Ebner when he sup-poses that the salts of lime are deposited only between the fibrils,while the latter themselves remain uncalcified. Fig. 14. 2>,. Fig. 14.—Ground section through the cuspid of man (twenty-three years;. V. Kochs andGolgis methods combined. P, cells of the pulp ; Od, odontoblasts ; D , uncalcified dentine ; ZK,Neumanns sheaths of the dentinal tubules. 250 diam. HISTOGEXY AND HISTOLOGY OF BONY AND DEXTAL TISSUES. I 277 Kolliker proved first that the so-called interglobular spaces of thedentine consist of uncalcified dentinal ground-substance, strongly re-sistant to acids. The protoplasmic dentinal fibers run unchangedthrough those spaces, as can be easily seen in wet ground *histological methods have now proved to me that Neumannssheaths, which inclose the dentine-fibers, and also most of the trans-verse processes are likewise nothing but the remains of uncalcifieddentinal ground-substance which have experienced some chemicalchange, by which they have become resistant to acids and alkalies,like the enamel-membrane. If we examine a non-macerated moist ground section of a toothwith a med
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