THE EVIDENCE FOR ORGANIC EVOLUTION 



527 



Fig. 284. — Evolution in horses. 



It appears that the domestic horse has come from at least two original wild stocks. 

 One species, represented by the Sewalik horse, was tall and slender-limbed, with broad 

 forehead and tapering face. The other, represented by the tarpan, was a shorter and 

 stouter-limbed type. The Shetland pony and draft horse have arisen from the generalized 

 domestic type existing in northwestern Europe in Roman times. Above, tarpan, a wild 

 horse of Mongolia; middle, Shetland pony; below, draft horse. (Photo, of tarpan from 

 Thomson, "Outline of Science," copyright, 1922, by George Newnes and Son, Ltd., re- 

 printed by permission; others by courtesy of American Museum of Natural History.) 



