. Age of the domestic animals : being a complete treatise on the dentition of the horse, ox, sheep, hog, and dog, and on the various other means of determining the age of these animals. Domestic animals -- Age; Teeth. 28 AGE OF THE DOMESTIC ANIMALS. the free portion or crown of these teeth, which becomes worn by friction with the hard substances which the animal takes as food, and by the constant contact wdth the teeth of tlie opposite jaw. After tlie high anterior and lower posterior borders of the virgin incisors have been worn away the table is estabhslied. At first this consists, on each t
. Age of the domestic animals : being a complete treatise on the dentition of the horse, ox, sheep, hog, and dog, and on the various other means of determining the age of these animals. Domestic animals -- Age; Teeth. 28 AGE OF THE DOMESTIC ANIMALS. the free portion or crown of these teeth, which becomes worn by friction with the hard substances which the animal takes as food, and by the constant contact wdth the teeth of tlie opposite jaw. After tlie high anterior and lower posterior borders of the virgin incisors have been worn away the table is estabhslied. At first this consists, on each tooth, of an oblong plate, wider from side to side, which is surrounded by the layer of cement directly covering the peripheral layer of enamel; hiside of this is found the zone of yellowish and softer dentine, usually somewhat de- pressed on account of its lesser resistance to friction ; in the. Transverse section of an incisor tooth. Inferior, ri;4ht siile. A, anterior; B, posterior; E, periplieral enamel; E', ce'.itral enamel; C, peripheral cement; C', central cement; I, ivory, or dentine. (Enlarf^ed.) middle, the central enamel or border of the cup surrounds the variable quantity of cement which may be deposited in it. (Fig. 10; Fig. 12,^; Fig. 15.) As the table gradually encroaches upon the wedge-shaped tooth (Fig. 16), it becomes proportionately narrower in its trans- verse diameter, and as it becomes oval in shape the cup is found nearer the posterior border of the tooth instead of in the centre. The dental star, or dark-colored dentine which takes the place of the papilla, now appears between the cup and the anterior border of the tooth (Fig. 12, P; Fig. 10, B.). A still further. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Huidekoper, Rush Shippen, 1854-1901. Philadelphia ; London : F. A. Davis
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphialondon
