24 Dynamic Evolution 



1818 Boston Blue 3 : 00 



1830 Bull Calf 2 :47K 



1839 Dutchman 2 : 32 



1845 Lady Suffolk 2 : 29 }£ 



1859 Flora Temple 2 : igj£ 



1874 Goldsmith Maid 2 : 14 



1 892 Nancy Hanks . 2 : 04 



1912 Uhlan 1 =58 



The general trotting stock used for breed- 

 ing purposes was, of course, much behind 

 these extraordinary animals at the time they 

 made their records. The fact that from this 

 general stock we have been getting, from 

 time to time, faster and faster horses, until 

 now we have many animals capable of trot- 

 ting a mile in 2 : 10 or less, shows clearly that 

 each generation of horses has inherited more 

 energy than the preceding generation by an 

 amount which is represented by an average 

 gain of nine seconds per generation in trot- 

 ting a mile. 



Whence came this increase in amount of 

 available energy? How did it get into succes- 

 sive generations of animals at higher and 

 higher potential? "You can't get something 

 from nothing. " Energy must be put into a 



