THE TEETH 



359 



third year, a fifth grinder (permanent) making its appearance about the 

 same time. Towards the end of this year the sixth grinder shows itself, but 

 grows very slowly, and the central nippers above and below fall out, and are 

 replaced by permanent ones, which, as before remarked, are considerably 

 larger in size and somewhat different in form. 



At three years the mouth presents the appearance shown in Fig. 6, 

 the development of the permanent teeth varying a good deal in different 

 individuals. At three years and four or six months, the next nipper all 



Fig. G.— Three-Year-old Mouth. 



B. Anterior maxillary bone. 



1. 1. Central permanent nippers, nearly full- 



grown. 



2. 2. Milk teeth worn down. 



3. 3. Corner milk teeth, still showing central 



mark. 



4. 4. Tushes concealed within the jaw. 



round falls out, and is replaced by the permanent tooth. The corner 

 nippers are much worn, and the mark in them is nearly obliterated. 

 About this time also the second grinder is shed. 



At four years of age the mouth should differ from that represented in 

 Fig. 6 in the following particulars : — The central nippers begin to lose their 

 sharp edges, and have grown considerably in substance. The next nipper 

 all round has grown nearly to its full size, but not quite, and its edges are 

 still sharp, with the mark deep and very plain. The corner milk nippers 

 still remain, unless they have been knocked out for pui'poses of fraud, wliich 

 is sometimes done to hasten the growth of the permanent teeth, and give 

 the horse the appearance of being four or five months older than he is. 



B B 



