DENTAL INDICATIONS OF THE AGE OF A HORSE. 223 
When the horse has attained its eleventh year, the 
second pair of nippers are quite rounded, and the central 
enamel is hardly any longer apparent in the teeth of the 
lower jaw. 
The corner teeth at twelve are rounded, and the central 
enamel has completely disappeared; the yellowish band is 
of greater extent, and occupies the centre of the wearing 
surface. In the upper jaw, however, the central enamel 
still remains. (See plate v. fig. 4.) 
At thirteen years of age the lower incisors are rounded, 
the sides of the nippers are getting elongated, the central 
enamel continues in the teeth of the upper jaw, but it is 
round and approaching to the posterior edge. The septum 
at the root is rounded in the dividers, and is seen in 
the middle of the table. The tushes are now generally 
much worn. 
The lower nippers present a triangular appearance at 
fourteen, the dividers are becoming long at the sides, the 
central enamel of the upper teeth diminishes, but still 
remains. The tushes are considerably more worn than in 
the preceding year. (Plate v. fig. 5.) 
At fifteen, the nippers are triangular, the dividers are 
becoming so ; the central enamel of the Upper teeth has 
not yet disappeared. The septum of the roots forms a 
rounded point on all the tables of the teeth. 
The dividers are triangular at sixteen, the corner teeth 
are beginning to become so ; the central enamel in the 
upper teeth will in most instances have quite disappeared , 
the nippers are beginning to be flattened at their sides. 
The tushes are now considerably more worn than in the 
preceding year. 
When the horse has reached its seventeenth year, the 
teeth of the lower jaw have become completely triangular, 
