NATURAL HISTORY OF THE HORSE. 



97 



the teeth, with the blackened surface which it presents, and 

 the elevated edge of enamel, will have disappeared. Persons 

 not much accustomed to horses have been puzzled here. They 

 expected to find a plain surface of uniform color, and knew not 

 what conclusion to draw when there were both discoloration 

 and irregularity. 



In the next incisors, the mark is shorter, broader, and fainter, 

 and in the corner teeth the edges of the enamel are more regu- 

 lar, and the surface is evidently worn. The tush has attained 

 its fall growth, being nearly or quite an inch long, convex 

 outward, concave within, tending to a point, and the extremity 

 somewhat curved. The third grinder is fairly up, and all the 

 grinders are level. 



The horse may now be said to have a perfect month. All 

 the teeth are produced, fully grown, and have sustained no 

 material injury. During these important changes of the teeth, 

 the animal has suffered less than could be supposed possible* 



At seven years, as in the 

 accompanying cut, the mark, 

 in the way in which it has 

 been described, is worn out 

 in the four central nippers, 

 and is fast wearing away in 

 the corner teeth ; the tush is 

 also beginning to be altered. 

 It is rounded at the point, 

 rounded at the edges, still 

 round without, and beginning to get round inside. 



At eight years old, the tush is rounder in every way ; the 

 mark is gone from all the bottom nippers, and it may almost 

 T 



SEVEN YEARS. 



