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Updated: May 14, 2025
Teal, constancy of. Tear-sacs, of Ruminants. Teebay, Mr., on changes of plumage in spangled Hamburg fowls. Teeth, rudimentary incisor, in Ruminants; posterior molar, in man; wisdom; diversity of; canine, in the early progenitors of man; canine, of male mammals; in man, reduced by correlation; staining of the; front, knocked out or filed by some savages.
The hind-feet are webbed, and with these together with his tail, which acts as a rudder he is enabled to swim rapidly through the water. The beaver is a rodent, with a short head and broad blunt snout, and his incisor teeth are remarkably large and hard, enabling him to bite through wood with wonderful ease and rapidity.
It is the more remarkable because we find a somewhat similar structure in the molar teeth of the elephants, which, like the rodents, have the incisor teeth largely developed and widely separated from the molars. There is nothing in the appearance of the water-rat which gives any indication of its aquatic habits.
His cleft upper lip trembled imperceptibly, and disclosed his long incisor teeth. Then his stubble-colored legs which were his traveling boots with their worn and broken claws extended. And he bounded over the hedge, rolled up like a ball, with his ears flat on his back.
Give the time of replacement of the temporary incisor teeth. How is the age of the animal determined between the fifth and ninth years? What changes in the appearance of the table surfaces occur between ten and fifteen years of age? Parrot-mouth, Lantern-jaw and Scissor-mouth.
It is worthy of remark that other animals, which, though not rodents, need to possess chisel-edged incisor teeth, have a similar habit. Such is the hippopotamus, and such is the hyrax, the remarkable rock-haunting animal, which in the authorised translation of the Scriptures is called the "coney," and which in the Revised Version is allowed in the margin to retain its Hebrew name, "shaphan."
You can see them all quite plainly in the skiagraph. The lower left lateral incisor had a very small gold filling, which you can see as a nearly circular white dot. In addition to these, a filling of tin amalgam had been inserted while the deceased was abroad, in the second left upper bicuspid, the rather gray spot that we have already noticed.
Moreover, in the least modified mammals the total number of the teeth is very generally forty-four, while in horses the usual number is forty, and in the absence of the canines it may be reduced to thirty-six; the incisor teeth are devoid of the fold seen in those of the horse: the grinders regularly diminish in size from the middle of the series to its front end; while their crowns are short, early attain their full length, and exhibit simple ridges or tubercles, in place of the complex foldings of the horse's grinders.
In a future chapter we shall meet with a closely parallel case, in the reduction or complete disappearance of the canine teeth in male ruminants, apparently in relation with the development of their horns; and in horses, in relation to their habit of fighting with their incisor teeth and hoofs.
The lips are rather thick, and the teeth generally very perfect and beautiful, though the dental arrangement is sometimes singular, as no difference exists in many between the incisor and canine teeth. The neck is short, and sometimes thick, and the heel resembles that of Europeans. The ankles and wrists are frequently small, as are also the hands and feet.
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