THE ANCESTORS OF THE HORSE 



of the pig, and of cattle, and of the reindeer. 

 They did not touch the ground (Fig. 93), and 



Fig. 92. — Hind-foot (to the left) and fore-foot (to the right) of 

 the horse-ancestor, Hyracotherium. The fore-foot is seen 

 to have four toes in full development. Photographed 

 from specimens in the Natural History Musexim. ' 



were evidently on the way to disappearing, 

 leading to the single-toed modern horse, with 



137 



