of the Animals of the Farm. 



21 



The tusks of the horse are often through the gums at four 

 years of age, but they are not usually fully developed before five 

 years, and occasionally they are not well up before five years 

 and a half. As a means of judging the age, these teeth are of 

 little importance. 



Fig. 13. — Incisors of Horse at four years. 



The above drawing (Fig. 13) represents the state of the 

 incisor teeth on the completion of the fourth year. 



Between four and five years the corner temporary incisors 

 are removed, and the permanent teeth occupy their places. 

 Indications of the change are seen at four years off in the 

 upper corner incisors, and in a few months the temporary teeth 

 are displaced, and the permanent organs are in the mouth. But 

 their edges do not meet until the fifth year is completed, and 



