INTELLIGENCE, POWER, 



Bearing on the high incidence of heart disease in civilized 

 man compared with that in primitive man, there is the 

 significant comparison between the size of the heart in a 

 "civilized" lion taken from the Philadelphia Zoological 

 Garden and another lion taken in the wild state. 



This suggests the effect of recurring frustrations and 

 irritations upon the heart muscle of the lion in captivity, 

 comparable to the effect of the frustrations and irritations 

 on the heart muscle in civilized man in his autocaptivity. 



If the size and power of the heart were the symbol of 

 the qualities implied in the term " lion-hearted," of all the 

 animals in the world of comparable size the heart of the 

 thoroughbred horse should be chosen. It would seem that 

 what is implied by the term "lion-hearted" is the 

 bravery of the lion, which, as we have seen, is due to 

 the size and complexity of its adrenal-sympathetic system. 

 The adrenal-sympathetic system, however, cannot be 

 counted upon to furnish bravery in all animals, because the 

 adrenal-sympathetic system and the quality of the action 

 patterns of the brain or "mind" furnishes energy to run 

 away as well as energy to attack. 



Since there is nothing characteristic in the size of the 

 brain and in the size of the heart of the lion as compared 

 with other animals, what, then, is meant by "lion-hearted ?" 

 The mechanism possessed by the lion, which has endowed 

 the lion with the qualities that "lion-hearted" implies, 

 is the mechanism of action patterns in the brain, which, 

 through millions of years of supremacy among the ani- 

 mals, has characterized the demeanor of the lion. 



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