12 HORSE AND MAN. 



through successive geological epochs and undergoing 

 determinate modifications, so as to bring it in accord 

 with its surroundings. Five or six links of this chain 

 have already been discovered, and in all probability 

 others will come to light. I shall only mention three 

 of these links. 



ELBOW, NEAR FORE-LEG (SEEN FROM RIGHT SIDE). 



The reader may have been struck with the fact 

 that the number of toes on the foot of a mammal 

 is exceedingly variable, but yet has certain limits. 

 Some, like man, have five toes or fingers (phalanges) 

 on each extremity, while others, like the horse, have 

 only one. Except by occasional monstrosity there 

 are never more than five phalanges, while the animals 



