AGE, AS INDICATED BY THE TEETH. 



317 



At nine, when the marks fail, the alterations in the crown surface or 

 table come to our aid. The two centre teeth, which came up at three, 

 become somewhat triangular. Fig. 147. At ten, the two next teeth show 

 similar signs. Fig, 154. At eleven, the corner teeth have become some- 



FiG. 154. 

 Teeth assuming triangular shape at ten years. 



what triangular. Fig. 155. At twelve, the triangularity has increased in 



Fig. 155. 

 Triangular shape of teeth at eleven years. 



all the teeth. Fig. 156. This alteration continues to increase in all the 



Fig. 15G. 

 Triangular shape of teeth at twelve years. 



teeth, until in very old horses the depth from front to rear exceeds the late- 

 ral width of the teeth. Figure 157 shows an average mouth of sixteen years 

 old. Figure 158 represents the appearance at twenty. Figure 159 shows 

 twenty-four; whilst Figs. 160 and 161 may serve as speciments of the teeth 

 in extreme age. 



