VETER1NART DENTAL SURGBRT. 



37 



Rare instances occur where one or two incisor 

 teeth are developed in the upper jaw ; but they are 

 so seldom noticed that a farther consideration than a 

 mere mention is not deemed necessary. 



The central incis- 

 ors and first interme- 

 diate (internal lateral), 

 are up before or some 

 days after birth; the 

 second intermediate 

 (external lateral), at 

 fourteen days, and the 

 corner by the twenty - 



first day. 

 FIG. 8. 



OX'S INCISOR TOOTH. The lllilk teCth f 



Wa, free portion, external face, the calf are also much 



outer border; <t, Ibid, internal 



face, outer border; b, root; c, smaller and whiter, 



neck; /, anterior border; P-, g\ 



inner border. Chanveau. and as the calf grows, 



the spaces between them widen until they are finally 

 shed. 



The incisor teeth are shed in the .order in which 

 they are'first cut. The central pair are replaced by 

 permanent ones at one and one-half years, and are up 

 and in wear at from one year and ten months to two 

 years. The first intermediates are replaced by per- 

 manent ones at two and one-half years, and are 

 up and in wear at three years; the second interme- 

 diates 1 at three years and three months, and are up and 



