. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). io82 Rural School Fig. 35.—Lower nippers an etght-year-old horse of marked changes in shape, becoming roundish on the inside, and the intermediates are also somewhat modified. If the horse'^ lips are parted and the mouth is viewed from the fiont, it will be noted that the central ones will appear much darker colored and longer than they di
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). io82 Rural School Fig. 35.—Lower nippers an etght-year-old horse of marked changes in shape, becoming roundish on the inside, and the intermediates are also somewhat modified. If the horse'^ lips are parted and the mouth is viewed from the fiont, it will be noted that the central ones will appear much darker colored and longer than they did at three or four. This is due to the shrinking or receding of the gums. Seven years old.—At seven years of age, the cups have disappeared from the inter- mediate teeth, although small dark spots may often be seen. The comer teeth still retain their cups, though they are quite shallow. The side view of a seven-year-old mouth shows one marked characteristic. The lower corner teeth seldom extend as far backwards as the upper ones do. Only in rare cases do all four comer teeth meet accurately. The result is that the face of the tooth in the rear recedes, while that part of the tooth not in wear projects downward, forming more or less of a notch. Eight years old.—At eight years of age, the cups have disappeared from the teeth in the lower jaw. One must not be misled by the slight dark colored indentations that are still present, for they are not deep enough to be called cups (Fig. 35). It is well to bear in mind that, from the time when the teeth in the lower jaw are well up and in wear, to the time the cups have disappeared in the lower jaw, is three years. The shape of the tooth has undergone marked changes. Compare Fig. 28 with Fig. 35 and Fig. 30 with Fig. 36. In the first instance the teeth were thin from outside to inside, and comparatively broad from right to left, while in the latter case they are much thicker from inside to outside. They have become more triangular
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