. 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. 12 AGE OF THE DOMESTIC ANIMALS. have a smooth and poUshed surface as the animal becomes older. The posterior face is concave from above to below, and slightly convex from side to side. The internal border of each tooth is thicker than the external. In a virgin tooth (Fig. 3), or one which is not worn by use, the free portion of crown is divided from in front to behind and limited
. 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. 12 AGE OF THE DOMESTIC ANIMALS. have a smooth and poUshed surface as the animal becomes older. The posterior face is concave from above to below, and slightly convex from side to side. The internal border of each tooth is thicker than the external. In a virgin tooth (Fig. 3), or one which is not worn by use, the free portion of crown is divided from in front to behind and limited by two borders, one anterior, a, and the other posterior, h, which are separated by a cavity known as the cup, c. The anterior border is the highest and longest; it is shaped convex transversely, and is the first portion of the tooth to come through the gum. The posterior border "be a Fig. 3. Longitudinal section of a virgin milk-tooth in its alveolar cavity. shorter and appears later, but soon reaches, however, the level of the anterior border from the wearing down of the latter. From the same cause the cup, which first existed, gradually disappears. This is known as the leveling of the teeth. The imbedded portion or root also contains a cavity, known as the internal dental cavity, or pulp-cavity {d), which protects the papilla or pulp of the tooth; but as the animal be- comes older the tooth elongates by the growth of its imbedded portion, and the internal cavity diminishes in calibre and is nearly obliterated by a deposit of bony substance; at the same. 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
