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. 



