. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 88.—Nemestrina Longirostris. by teeth, which are implanted in the jaws. These are composed of a substance that bears a strong resemblance to bone in its texture and hardness; and are so fixed as to act against one another, with a cutting, crushing, or grinding power, accord- ing to the nature of the food on which they have to operate. The manner in which they are formed is worthy of note. In Man, who may be taken as a fair example, each tooth is de- veloped in the interior of a d little membranous sac, which is lodged
. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 88.—Nemestrina Longirostris. by teeth, which are implanted in the jaws. These are composed of a substance that bears a strong resemblance to bone in its texture and hardness; and are so fixed as to act against one another, with a cutting, crushing, or grinding power, accord- ing to the nature of the food on which they have to operate. The manner in which they are formed is worthy of note. In Man, who may be taken as a fair example, each tooth is de- veloped in the interior of a d little membranous sac, which is lodged in the thickness of the b ° Fig. 89.—Development of Teeth. c jaw-bone; as seen in the ac- a, the gum ;&, the lower jaw; ,3 angle of companying figure, which repre- the Jaw > d>dental capsules, sents half the lower jaw of a very young infant, from which the outside has been removed. This sac, which is named the dental capsule, (a, Fig. 90,) is composed of two membranes, abundantly furnished with blood-vessels; and it encloses in its interior a little bud-like protuberance, b, in which ramify a great number of nervous filaments and minute vessels, c. The matter composing this little body, which is termed the pulp, is gradually converted into the ivory of the tooth, which. 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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