The Dental cosmos . calledinterglobular spaces were present in the dentine, indicating a deficientcalcification of territories at the period of development, which cor-responds with that of the formation of enamel. In only one specimenhave I seen a devious course of the dentinal fibers and stratificationof the dentine. 6l2 THE DENTAL COSMOS. In one instance peculiar formations were seen in the cementum.(See Fig. 7.) The cementum here exhibits distinct lamellations and scatteredcement-corpuscles, with their longitudinal diameters mostly arrangedvertically to the direction of the lamellae. The ce
The Dental cosmos . calledinterglobular spaces were present in the dentine, indicating a deficientcalcification of territories at the period of development, which cor-responds with that of the formation of enamel. In only one specimenhave I seen a devious course of the dentinal fibers and stratificationof the dentine. 6l2 THE DENTAL COSMOS. In one instance peculiar formations were seen in the cementum.(See Fig. 7.) The cementum here exhibits distinct lamellations and scatteredcement-corpuscles, with their longitudinal diameters mostly arrangedvertically to the direction of the lamellae. The cementum wasabruptly interrupted by the dipping downward to the close vicinityof the dentine of the pericementum. In this situation the prolonga-tions of the pericementum were hardened by globular depositions oflime-salts, which were conspicuous by a high degree of refraction. This anomaly—altogether different from the process of absorptionof the roots of temporary teeth, or that of bone—must have occurred Fig. Irregularities of cementum. P, pericementum ; C, stratified cementum with cement-corpus-cles ; E, excavations of cementum filled with pericementum ; C, globular stratified depositionsof lime-salts ; D, D, dentine. < 100. at the time of the development of the cementum, which, as is wellknown, takes place after the formation of the dentine. The morbidprocess was undoubtedly pericementitis, which led to a partial destruc-tion of the pericementum. At these points, consequently, no cemen-tum was deposited. A remarkable feature in connection with this case was the appar-ently perfect condition, in the mouth, of the gum and alveolus. Inthe pericementum the microscope revealed nothing anomalous excepta few scattered calcified patches. It is hardly possible that there is CONGENITAL DEFECTS IN ENAMEL. 613 any especial connection between this and the morbid process in theenamel, as the enamel is completely formed at a much earlier periodthan this could have happened. As to
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