INTELLIGENCE, POWER, 



getaway power of the zebra was "bred" by the most rigid 

 stable master in the world the lion; and the "staying 

 heart" of the zebra was "bred" by the pack of wild dogs. 

 In the wild state the daily life-and-death races of the zebra 

 keep him in a continual Derby. The Shetland pony, on the 

 other hand, is bred by the rigorous discipline of cold and 

 storm. In either case the energy-controlling organs have 

 been "bred," that is, stepped up over long periods of 

 time. 



Let us now see how the energy systems of these two 

 members of the horse family compare with each other. 



Since cold alone steps up the energy organs higher than 

 does the race of destiny, we should expect that the Shetland 

 pony would have a higher ratio of the combined weights of 

 the brain and thyroid and adrenal glands to its body weight 

 than the zebra. The ratio of the weight of the brain and 

 thyroid and adrenal glands to the body weight in the case 

 of our Shetland pony, which weighed 150.35 kilograms 

 (331.52 pounds) was 1:285; ' m tne case of the zebra, which 

 weighed 254.37 kilograms (560.88 pounds) the ratio of the 

 weight of the brain and, thyroid and adrenal glands to the 

 body weight was 1:432. 



Let us now compare the weight of the brain and the 

 thyroid and adrenal glands to the body weight of a wild 

 zebra collected on the plains of Tanganyika, the American 

 thoroughbred stallion Equipoise, and the Arabian stallion 



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