of the Animals of the Farm. 



25 



table of the tooth as it does at six years old. These teeth are 

 also deeper from front to back than they were at six years. 



The central incisors at seven years old have their sides 

 elongated, so that the table approaches the figure of a triangle. 

 The mark is very close to the posterior edge of the tooth, and 

 the central enamel forms an oval with flattened sides in place of 

 the elliptical figure which is shown in the drawing of the six- 

 year-old mouth. The tusks are somewhat blunted at their 

 points. 



Fig. 16. — Incisors of Horse at seven years. 



The above illustration (Fig. 16) represents the above-described 

 characters of the seven-year-old mouth. 



Between the seven-year-old and the eight-year-old mouth 

 the diff'erence at first sight is not very marked, and the examiner 

 is required to look rather critically at the tables of the incisor 

 teeth, the shape of the central enamel in the central incisors, 

 and the form of the tables of the corner teeth. 



In some cases the corner teeth will show almost as much 

 wear at seven years old as they do in other cases at eight years ; 

 but there are differences in the height of the teeth above the 



