the carnivores, unlike man, did not impose a selection as a 

 calculated advantage for the long future. The immediate 

 necessity of the carnivores was food. 



In breeding the horse, man imposed on the horse condi- 

 tions calculated in effect to contribute more to man's own 

 future needs than to his immediate necessity. Therefore, in 

 his selective breeding of the horse, man bred the horse not 

 alone for energy but for the kinds of energy most calculated 

 to help man to survive. 



In the wild state the horse evolved in much the same 

 way as the deer and the antelope. During the forty-two 

 millions of years of the known existence of the horse, 

 the greatest change in its fate took place with the rise of 

 man. 



The brain, the thyroid gland, and the hand of man are 

 unique among all animals. The rise of man appears to be an 

 example of the principle of orthogenesis applied to the 

 thinking brain and the thyroid gland. This principle, as 

 explained by Eimer, is that when a species begins to vary 

 definitely in any direction it cannot reverse itself, even if it 

 is tending toward its own destruction. As orthogenesis 

 made man increasingly more intelligent, man gained control 

 over the energy of plants and animals as well as of the wind, 

 the waterfall, and coal. Man found that the four feet of the 

 horse could be substituted for his own two feet in traveling 

 and in carrying burdens and that the horse was of particular 

 advantage in war. 



The sculptures of early man show that at a very early 

 date man found that the legs of a horse could carry him 

 faster and longer in attack or retreat than his own legs. 

 By riding, he could attack his fellow man by a combined 

 man-and-horse attack, or, in case of a hand-to-hand com- 

 bat, the horse would deliver him fresh for a surprise attack. 

 In fact, such a unit was man and his horse in early days 

 that in art we find realized the concept of the centaur a 

 beast half horse and half man. 



128 



