DENTITION AND USE AS SHOWN BY TEETH, ETC. 307 



According to this rule the natural age of the horse would be 

 about twenty-five years. But, after all, some horses are as old 

 at twelve years as others are at twenty. And so of man, some 

 men being as old at forty as others are at sixty years. 



"When a horse or a man is worn out and broken down, 

 they become old, and it matters not how many or how 

 few years have elapsed since their birth. 



