INTELLIGENCE, POWER, 



weight of the brain, the heart, and the thyroid gland were 

 as follows: 



The striking difference between the size of the brain, the 

 heart, and the thyroid gland of the white whale of the 

 cold arctic sea and the manatee of the warm tropics, each 

 being warm-blooded and each having mammalian lungs 

 necessitating rising to the surface of the water to breathe, 

 offers further evidence that climate alone is one of the most 

 potent factors in the evolution of warm-blooded animals. 



This comparison affords further evidence that the neuro- 

 endocrine formula of the north, namely, a large brain, a 

 large heart and blood volume, and a large thyroid gland, is 

 an adaptation against cold. 



As a corollary, it requires a higher degree of intelligence, 

 power, and personality to live an active life in the cold 

 north than an indolent life in the tropics. 



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