The Dental cosmos . tions of any part ofthe tooth, we notice features iden-tical with those of longitudinalsections. (See Fig. 2.) The dentinal fibers of somewhatvarying diameters exhibit hollowcenters in many instances. Fromtheir periphery broad and narrowoffshoots spring forth in a con- MINUTE STRUCTURE OF DENTINE. 719 siderably larger number than ever visible in sections of teeth nottreated with chloride of gold. The basis-substance appears to betraversed by a dark violet reticulum of the same character as thatof longitudinal sections. Oblique sections will of necessity show anapparently la
The Dental cosmos . tions of any part ofthe tooth, we notice features iden-tical with those of longitudinalsections. (See Fig. 2.) The dentinal fibers of somewhatvarying diameters exhibit hollowcenters in many instances. Fromtheir periphery broad and narrowoffshoots spring forth in a con- MINUTE STRUCTURE OF DENTINE. 719 siderably larger number than ever visible in sections of teeth nottreated with chloride of gold. The basis-substance appears to betraversed by a dark violet reticulum of the same character as thatof longitudinal sections. Oblique sections will of necessity show anapparently larger number of dentinal canaliculi and their tenants thanlongitudinal or transverse sections in a given area of dentine. Herewe often obtain the impression that rectangular offshoots of one den-tinal fiber inosculate directly with neighboring fibers, thus furnishinga pretty figure of a ladder with minute rungs. These images wereseen by Dr. W. H. Atkinson, and are alluded to in the historical partof mv paper. Fig. Dentine of a dead temporary tooth, stained with chloride of gold, decalcified with 1200. C, C, canaliculi, holding shriveled dentinal fibers ; B, B, basis-substance, holding ashriveled reticulum. All that I have described thus far as being present in the main massof the dentine is plainly visible only in the dentine of teeth that werealive at the time of extraction. If life has been destroyed to a vary-ing extent by an alveolar abscess or pyorrhea alveolaris, the imagefurnished by the dentine is so characteristic that we recognize at thefirst glance the extinction of life. Several times have I ground teethwithout knowing that they were dead. The microscope revealed thefact. (See Fig. 3.) In longitudinal sections only the canaliculi are conspicuously prom-inent, exhibiting delicate and numerous interruptions along their walls. 720 THE DENTAL COSMOS. The dentinal fibers appear shriveled up to rows of minute granules,not always in the center of the canali
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