of tlie Animals of the Farm. 



17 



months, tlie four permanent incisors will be in actual contact, 

 at least in regard to their anterior edges when the mouth is 

 closed ; but on examining the tables it is apparent that no wear 

 has taken place, and the posterior edges of the teeth are not yet 

 level with the anterior. 



At three years old the central permanent incisors are fully 

 developed, and the anterior edges show a narrow line of worn 

 surface. The posterior edges are level with the anterior, but 

 are not worn to the same extent. 



Fig. 9. — Incisors of Cartfilly at two years. 



In giving an opinion in a case of dispute as to the age 

 exceeding or not exceeding three years, the examiner will pay 

 particular attention to the upper surfaces of the central per- 

 manent incisors in the first place. The tables of these teeth 

 are not fully formed at three years of age, and the cavity is not 

 bounded by a line of worn structure, but extends quite across 

 the teeth, and is open at least on one side and sometimes on 

 both sides. Perfectly formed tables on the central incisors will 

 certainly indicate that the horse is above the age of three, and 



B 



