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Updated: May 14, 2025
Do these young folks suppose that all vanity dies out of the natures of old men and old women? A dentist of olden time told me that a good-looking young man once said to him, "Keep that incisor presentable, if you can, till I am fifty, and then I sha'n't care how I look."
So the blade of the chisel is merely faced with a thin plate of hardened steel, the remainder being of softer material. Now, it is not at all likely that the unknown inventor of the modern chisel was aware of the analogy between art and nature, and would probably have been very much surprised if anyone had stated that he had borrowed his idea from the incisor teeth of the water-rat.
The boys learn to shoot with a smaller and lighter instrument. The tools used are made of the incisor teeth of the paca and cavy. A light arrow is put in at the inner end, and when the ball of silk-cotton secured to the shafts fits tightly, it can be propelled with such force by the breath that it makes a noise almost as loud as a pop-gun when flying from the muzzle.
Place the two animals side by side, and you will wonder how anyone could mistake the one for the other. The teeth, too, are quite different. Instead of being white, like those of the rat, the incisor teeth are orange-yellow, like those of the beaver. Indeed, the water-rat possesses so many beaver-like characteristics, that it was ranked near the beaver in the systematic lists.
Immature plumage of birds. Implacentata. Implements, employed by monkeys; fashioning of, peculiar to man. Impregnation, period of, influence of, upon sex. Improvement, progressive, man alone supposed to be capable of. Incisor teeth, knocked out or filed by some savages. Increase, rate of; necessity of checks in. Indecency, hatred of, a modern virtue.
They have retained some at least of the upper incisor teeth, and, except in some rhinoceroses, the canines are also left; the molars and premolars are practically alike in all recent species, and in all of which we know the soft parts, the stomach has but one compartment, and there is an enormous caecum.
Up to 1857 all the mammalian remains discovered in secondary rocks had consisted solely of single branches of the lower jaw, but in that year Mr. Beckles obtained the upper portion of a skull, and on the same slab the lower jaw of another quadruped with eight molars, a large canine, and a broad and thick incisor.
The common deformities of the jaw and teeth are the overshot or parrot-mouth, the undershot or lantern-jaw, and the scissor-mouth. These different deformities result in unequal wear on the table surfaces of the incisors and molars. In both the overshot and undershot jaws, the incisor teeth become abnormally long.
Being rodents, they can have but two incisor teeth in each jaw, these teeth being rootless, and so set in their sockets that they are incessantly worn away in front, and as incessantly grow from the base, take the curved form of their sockets, and act much like shears which have the inestimable property of self-sharpening when blunted, and self-renewal when chipped or actually broken off by coming against any hard substance.
The Tragulidoe; have no incisors in the upper jaw, and only six grinding-teeth on each side of each jaw; while the canine is moved up to the outer incisor, and there is a diastema in the lower jaw. There are four complete toes on the hind foot, but the middle metatarsals usually become, sooner or later, ankylosed into a cannon bone.
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