70 AGE OF THE HORSE. 



and gradually tapers to the root, where it is quite pointed, and 

 the black mark, beginning at the crown and running down near 

 the whole length of the tooth, represents the groove we dwelt 

 upon before. 



The representation in Cut 17, marked B, gives you a side view 

 of the same tooth, and shows the top or crown to be much nar- 

 rower on the side than on the front, and instead of gradually 

 tapering down to a sharp point, it bulges out or becomes thicker 

 near the middle than at either end. By this it will be seen that 

 as the tooth wears away, by coming in contact with the upper 

 jaw, the crown becomes narrower, as it wears down to the root, 

 and thicker from the outside to the inside of the tooth. 



No. IS 



Shows nipper as it appears at three, six, twelve, eighteen, and twenty-four 

 years. 



Cut 18 shows the shape of the crown of the nipper tooth at 

 different ages. The upper section of this tooth shows a three- 

 year-old tooth. 



The width is from figure one to figure two, while the thickness 



