HUNTING FOR ANIMALS OF PAST AGES 31 



his brain also developed. The horse is a story 

 of evolution of progressive change. The horse, 

 when the Ice Age appeared, numbered at least 

 ten species, one of which was larger than any 

 present horse. Though numbering millions the 

 horse completely vanished in America during the 

 Ice Age. No one has yet determined the cause 

 of the extinction. Our American horses are de- 

 scendants of the Arabian horses brought to Mex- 

 ico by the Spaniards. 



Though I had many a happy search and per- 

 suaded the men to examine numerous fossils in 

 steep-walled cliffs, a little Miohippus was not 

 discovered. The cook urged me to buy a Shet- 

 land, though this was far larger than Miohippus, 

 as he thought this and my giant razor-back 

 would make a good start for a circus parade. 



One day I found promising fossils about 

 ten miles from camp, but it was so far away 

 that several days elapsed before the scientist 

 could ride over to examine. One morning he 

 and two geologists took tools for the careful 

 work of getting the fossil out of its place in solid 

 though not hard rock. We used pick and shovel 

 in cleaning off the rock over the fossil and after 

 this the geologists used chisels, hammers, and 

 small pointed gouges and finally awls and brushes. 

 The idea was to free the fossil without cracking 

 or losing any of it. Often days are required in 



