56 



BIOLOGY AXD ITS MAKERS 



tor of the horse made by Charles R. Knight, the animal 

 painter, under the direction of Professor Osborn. 



^^'hile the limbs were undergoing the changes indicated, 

 other parts of the organism were also being transformed 



Fig. 105. — Bones of the Foreleg of a Horse. 



and adapted to the changing conditions of its life. The 

 evolution of the grinding teeth of the horse is fully exhibited 

 in the fossil remains. All the facts bear testimony that 

 the horse was not originally created as known to-day, but 

 that his ancestors existed in different forms, and in evolution 

 have transcended several genera and a considerable num- 

 ber of species. The highly specialized limb of the horse 

 adapted for speed was the product of a long series of changes, 



