ANATOMY, UNSOUNDNESS, AND AGE OF A IIORSE 53 



in the corner pair of incisors 

 in the lower jaw have disap- 

 peared, or nearly so ; but they 

 are present in all of the incisors 

 of the upper jaw, though show- 

 ing wear. (Fig. 39.) 



Nine years old. — The cups in 

 the center pair of incisors in 

 the upper jaw have disap- 

 peared; though these cups are 

 not likely to disappear at such 

 regular intervals in the upper 

 as in the lower jaw. There- 

 fore, it is not always possible 

 to tell the age of the horse so 

 accurately. (Fig. 40.) 



Ten years old. — ^As a rule, 

 the cups have disappeared from 

 the intermediate incisors in the 

 upper jaw. The teeth are more 

 triangular in shape, and those of 

 the lower and upper jaw meet 

 at a sharper angle as the age 

 increases. (Fig. 41.) 



Eleven years old. — ^As a rule, 

 the cups have disappeared from 

 the corner incisors in the upper; 

 jaw. However, because of the 

 fact that some horses have 

 denser bones than others, it is 

 not uncommon to find cups in 

 the upper teeth as late as the 

 twelfth or the fifteenth year. 

 (Fig. 42.) 



Aged horses. — A f t e r the 

 horse has passed the twelfth 

 year, the matter of a year 

 or two is unimportant. The 



Fic. 42. — Upi'ER Front Teeth 

 Eleven Years of Age 



.<^'k A":i 



Fig. 43. — Upper Front Teeth at 

 Fifteen Years of Age 



Fig. 44.- — Upper Front Teeth 

 TwENTv-oNE Years of Age 





FiG. 45. — Upper Front Teeth at 

 Thirty Years of AQB 



