260 



THE HORSE. 



tially developed, and lying deeper than the niilk toethj As the 

 mouth grows, it becomes too large for its first set of teeth and the 

 roots of these being pressed upon by the growth of the permanent 

 set, their fangs are absorbed, and allow the new teeth to show 

 themselves, either in the places of the former, or by their sides, in 

 which case they are known by the name of .eolf's teeth. This 

 change proceeds in the same order as the cutting of the milk 

 teeth, commencing with the first grinder, which is shed and re- 

 placed by a permanent tooth early in the 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 ar« 

 replaced by permanent ones, which, as before remarked, are con- 

 siderably larger in size and somewhat different in form. 



At three years the mouth presents the appearance shown on 

 the preceding page, the development of the permanent teeth vary- 

 ing a good deal in different individuals. At three years and four 

 or six months, the next nipper all round falls out, and is replaced 

 by the permanent tooth. The corner nippers are much worn, ana 

 the mark in them is nearly obliterated. About this time also the 

 second grinder is shed. 



At four tears of age, the mouth should differ from that 



Fig. 4. — MOUTH OF the colt at four and a HALF years. 



A. A nteriir maxillary bone. 



1. 1. Central nippers, considerably worn 



down. 



2. 2. The next pair, fully duveloped, with 



their edges slightly worn. 

 8. S. Corner permanent nippers, in a Btate 



Of growth, with the edges of the 

 cavity sharp, and the mark very 

 plain. 

 4. 4. The tushes showing themselves through 

 the gum, but not ful'-grown. 



represented in fig. 3 in the following particulars : — The central 

 nippers begin to lose their sharp edges, and have grown coniider- 



