CHAP. I.] MARKS WEAR OUT IN SUCCESSION. 551 



annexed cut. As just said, they are also larger 

 and of a darker colour than the sucking teeth. 

 But between the third and fourth years, two further 

 colt's teeth (as well 

 above as below) 

 shed, and are re- 

 placed by " horse 

 teeth," i. e. larger 

 and browner than 

 the sucking teeth, 



with the black 4 years old. 



mark ; the tushes also push forth, and the horse 

 is now full mouthed, as represented by the cut in 

 the margin. 



Only the corners now remain unchanged from 

 colts' to horses' teeth. These differ from the others 

 in being shorter, smaller, and of a shell-like ap- 

 pearance, until the middle of the fifth year, when 

 these also are displaced by horse teeth, in shape 

 much like the former, and their marks but just per- 

 ceptible within the upper surface. But, toward 

 the completion of Jive years of age, they become 

 larger, are more strongly marked, and are grooved 

 on the inside, which 

 groove denotes the age 

 to be Jive with pre- 

 cision ; no deception 

 can be practised on 

 this point, nor as re- 

 gards the tushes, which 

 are now curved, having 5 years. 



