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VETERINAKy MEDICINE AND 8UKGERY. 



wear, and indeed all the teeth appear somewhat smaller than they did in 

 the yearling. They also stand somewhat wide apart at their necks, on 

 account of the gradual growth of the jaw in width. (Figure 140.) 



Fig. 140. 

 Teeth at Two Years, 



Development of the Permanent Teeth.— A few months before 

 three years old, the horse sheds the two centre milk teeth, which are re- 



FlG. 141. 

 Teeth at Three Years. 



placed by permanent. Thus the jaw contains at three years old two 

 centre permanent teeth and two milk teeth on each side. (Figure 141. ) 

 A few months before four, the horse sheds the two next milk teeth, 

 which are replaced by permanent. Thus the jaw now contains four 

 permanent and one milk tooth on each side (Figure 142). The appear- 

 ance of the mouth, when closed, and also the mode in which the teeth 

 meet, are shown in Figure 165. This figure will be presently contrasted 

 with Figure 163, which shows the mode in which the mouth closes, and 

 the teeth meet in extreme old age. 



