. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 95.—Teeth of Herbivorous Animal. Fig. 96.—Teeth of Frugivorous Animal. tooth is composed. The enamel, instead of covering its crown, is arranged in upright plates, which are dispersed through the tooth ; and the space between them is filled up by plates of ivory and of cortical substance. These last, being softer than the enamel, are worn down the soonest; and thus the plates of enamel are left constantly projecting, so as to form a rough sur- face, which is admirably adapted to the grinding action the tooth is destine
. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 95.—Teeth of Herbivorous Animal. Fig. 96.—Teeth of Frugivorous Animal. tooth is composed. The enamel, instead of covering its crown, is arranged in upright plates, which are dispersed through the tooth ; and the space between them is filled up by plates of ivory and of cortical substance. These last, being softer than the enamel, are worn down the soonest; and thus the plates of enamel are left constantly projecting, so as to form a rough sur- face, which is admirably adapted to the grinding action the tooth is destined to perform. In the great gnawing teeth of the squirrel, &c, the front surface only is covered with enamel; and as this is worn away more slowly than the ivory, it stands up as a sharp edge (Fig. 91), which is always retained, however much the tooth may be worn away. 183. Of all the teeth, the molars may be regarded as the most useful. They are seldom absent in the Mammalia; and their office is usually essential to the proper digestion of the. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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