68 



THE HOKSE. 



is worn out. Tliere will still be a difference of color in the cen- 

 tre of the tooth. The cement filling wp the hole, made by the 

 Fig. 9. dipping of the enamel, will pre- 



sent a browner hue than the 

 other part of the tooth, and it 

 will be evidently surrounded by 

 an edge of enamel, and there 

 will remain even a little depres- 

 sion in the centre, and also a de- 

 pression round the case of ena- 

 mel ; but the deep hole in the 

 centre of the teeth, with the 

 blackened surface which it pre- 

 sents, and the elevated edge of 

 enamel, will have disappeared. Persons not much accustomed 

 to horses have been puzzled here. They expected to find a plain 

 surface of uniform color, and knew not what conclusion to draw 

 when there was both discoloration and irregularity. 



" In the next incisors the mark is shorter, broader, and 

 fainter, and in the corner teeth the edges of the enamel are more 

 regular, and the surface is evidently worn. The tush has at- 

 tained its full growth, being nearly or quite an inch long, con- 

 vex outward, concave within, tending to a point, and tlie ex- 

 tremity somewhat curved. The third grinder is fairly up, and 

 all the grinders are level. 



" The horse may now be said 

 to have a perfect mouth. All 

 the teeth are produced, fully 

 grown, and have hitherto sus- 

 tained no material injury. Du- 

 ring these important changes of 

 the teeth, the animal has suffered 

 less than could be supposed 

 possible. 



" At seven years — see fig. 

 10 — the mark, in the way in 

 which we have described it, is 

 worn out in the four central nippers, and fast wearing away in 

 the corner teeth ; the tush also is beginning to be altered. It 



Fig. 10. 



