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Updated: May 15, 2025
Hence the general principles of the hypothesis of evolution lead to the conclusion that the horse must have been derived from some quadruped which possessed five complete digits on each foot; which had the bones of the fore-arm and of the leg complete and separate; and which possessed forty-four teeth, among which the crowns of the incisors and grinders had a simple structure; while the latter gradually increased in size from before backwards, at any rate in the anterior part of the series, and had short crowns.
The incisors are at the points, they gallop up and down, and are worthless for doing hard work; the molars are at the hinges, and move slowly; and if anything tough has to be dealt with, it comes to them as a matter of course; hence they are the nutcrackers.
It is for this reason that rats and mice have such incessant appetites, and that with them "all is fish that comes to the net;" old books, rags, and even planks of wood, which they will gnaw for want of something better. Come what may, they must keep up at an equal rate the wear and tear of the incisors, and the internal growth of the pulp beneath, which is always pushing the tooth forward.
I fancy he thought he had him when they came together about five feet outside the crevice in the wall for which the woodchuck had made his fuzzy bee line, but as a matter of fact the woodchuck got the first grip. His long yellow incisors met in the cocker's shoulder and that worthy gave forth a yelp of pain and indignation as the battle began with that strange hold.
After this, Tamar heard parting steps, and various low rumbling noises as if proceeding from under ground; then all was still, and no farther sound was heard by her, but the rustling of leaves, the chirping of birds, and the cropping of the herb by the incisors of Brindle.
They sometimes say of a man who has not eaten for a long while, that his teeth have grown long. This is a joke with us; but in the case of a rodent would be too serious a matter to be a joke; for, as their incisors are always growing, like our nails, they would soon become too long if the animal ceased for any length of time to wear them down by eating.
Her eyes were larger than most of her kind, and they were not so deep-set, while the lashes were longer and more regular. Nor was her nose so thick and squat. It had quite a bridge, and the nostrils opened downward. Her incisors were not large, nor was her upper lip long and down-hanging, nor her lower lip protruding.
Its lower end, though intimately united with that of the tibia, is clearly marked off from the latter bone. There are forty-four teeth. The incisors have no strong pit. The canines seem to have been well developed in both sexes.
As they leave, teeth of the second, or permanent, set take their place. This set has thirty-two teeth of four different kinds arranged in the two jaws as follows: In front, above and below, are four chisel-shaped teeth, known as the incisors. Next to these on either side is a tooth longer and thicker than the incisors, called the canine.
Over these rose the old forest-trees, the maple, scarred with the wounds which had drained away its sweet life-blood, the beech, its smooth gray bark mottled so as to look like the body of one of those great snakes of old that used to frighten armies, always the mark of lovers' knives, as in the days of Musidora and her swain, the yellow birch, rough as the breast of Silenus in old marbles, the wild cherry, its little bitter fruit lying unheeded at its foot, and, soaring over all, the huge, coarse-barked, splintery-limbed, dark-mantled hemlock, in the depth of whose aerial solitudes the crow brooded on her nest unscared, and the gray squirrel lived unharmed till his incisors grew to look like ram's-horns.
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