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As to the sloth's relationship to the armadillo, this rests upon a detail which bears directly upon our subject. The molars in both animals are cylindrical and smooth, this is a trifle, but what would you have? The animal had to be classed somehow; since naturalists have not had the wit to make detached companies, as they do in regiments of soldiers. We are going farther and farther away.
Its front teeth resemble those of a rodent, and its molars those of the rhinoceros. In many respects it is a most primitive and generalised little animal, preserving the ancestral form more or less faithfully since Tertiary days in the shelter of the African Continent.
Right in front of us half a dozen sets of false teeth, arranged in a horrid circle around a cigar-box full of extracted molars such as made one cringe, grinned bitingly out of a glass case before the dentist's office door. The effect was of a lipless and ghastly laugh.
Some Sir William Thomson tells us how hydrogen gas will chew up a large iron spike as a child's molars will chew off the end of a stick of candy. Thus each new book opens up some new and hitherto unexplored realm of nature. Thus books fulfill for us the legend of the wondrous glass that showed its owner all things distant and all things hidden.
The Gorilla has the crown of the hindmost grinder of the lower jaw more complex, and the order of eruption of the permanent teeth is different; the permanent canines making their appearance before the second and third molars in Man, and after them in the Gorilla.
The teeth were not as in other human beings incisors, canines, and molars: they were all exactly alike, above and below, each tooth a gleaming white triangle, broad at the gum where it touched its companion teeth, and with a point sharp as the sharpest-pointed dagger. They were like the teeth of a shark or crocodile.
I may mention, however, that two young animals I had in my possession alive, one a kassar, the other a pappan, fully bore out these remarks by their proportionate size. The pappan, with two molars, showed the callosities distinctly, and was as tall and far stouter than the kassar with three molars, while the kassar had no vestige of the callosities.
This order devours insects, as their name tells you plainly enough. They feed in the same manner as the bats; consequently they have molars like theirs, as was necessary. It is an unimportant little family, and we will not waste much time upon it.
This should be followed by dressing the teeth every six or twelve months. The external border of the superior and the internal border of the inferior row of molars wear away slowly, and sometimes become quite sharp. This is objectionable because the sharp points lacerate the mucous membrane of the cheek and tongue, and the mastication of the feed is seriously interfered with.
Henry Moon drew attention to a change in the first molars; these are reduced in size and dome-shaped through dwarfing of the central tubercle of each cusp. #Diagnosis of Inherited Syphilis.# When there is a typical eruption on the buttocks and snuffles there is no difficulty in recognising the disease.
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