OF THE AGE OF A HORSt. 2S* 



their appearance, though sometimes earlier. — 

 The tushes are four in number, and situate 

 about an inch from the corner teeth ; at first 

 they are small, terminate in a sharp point, 

 are rather convex on their external surface, 

 but within have two concavities or grooves 

 separated by a ridge. These, as well as the 

 teeth, are gradually undergoing an alteration 

 in their form, becoming longer, and losing 

 the concavities on the internal surface. About 

 the seventh year the concavity is considerably 

 diminished, and in old horses the surface be- 

 comes convex, the tush acquires a round 

 form, and the extremity, instead of being 

 sharp, is quite blunt, as if the point had been 

 broken off, and the new surface afterward 

 polished. We must now return to the teeth, 

 the appearances of which we have described, 

 as far as the completion of the fifth year of g, 

 horse's age. After this period wa judge of 

 the acre bv the size of those cavities which we 

 have described on the upper surface of the 

 tooth; for the friction to which that surface 

 is almost constantly exposed gradually wears 

 it down, and at length the cavity or mark is 

 totally obliterated. The marks in the upper 

 teeth most commonlv remain uiitii the twelfth 



•J 



VOL. I. O 



