274 The Trotting and the Pacing Horse 



cells. The germ plasm is continuous, and upon 

 it depends the doctrine of heredity. The energy 

 of inheritance, nevertheless, is not unchangeable 

 in its type. Were it so, the theory of evolution 

 would fall to the ground. The potency of some 

 new lines is superior to the old, and thus advance 

 steps are made. Evolution is progressive, is a 

 succession of platforms one rising above the 

 other; and Pope, following Spencer, furnishes 

 food for reflection when he says : " The two sen- 

 sations of hunger and sex have furnished the 

 stimuli to internal and external activity, and 

 memory or experience with natural selection 

 have been the guides. Mind and body have thus 

 developed contemporaneously and have reacted 

 mutually." The high-bred horse has more intel- 

 ligence, more sensibility, than the low-bred horse, 

 and his social instincts probably are greater. 



