INTELLIGENCE, POWER, 



subarctic ungulates than in the tropical ones. He found 

 the brain of the white whale to be 300 per cent larger than 

 those of any other of the 284 species exclusive of the 

 human examined among the 3,734 animals studied in this 

 research. 



The aquatic Carnivora exhibited a degree of brain 

 development 89 per cent higher than that of the tropical 

 land Carnivora, and the subarctic, doglike Carnivora 

 possessed a brain coefficient 26 per cent higher than that of 

 the tropical, catlike Carnivora. 



In his study of the thyroid glands evaluated on the 

 relative-growth scale and expressed in terms of the thyroid- 

 ization coefficient, Dr. Quiring found that both the sub- 

 arctic rodents and the subarctic Carnivora showed a 

 larger coefficient than those collected in the tropics. The 

 white whales that we collected showed thyroid coefficients 

 over 300 per cent larger than the next highest group of 

 Carnivora, and the ungulates showed a difference, but the 

 difference was not so great. 



The coefficient that expresses the relative degree of heart 

 development, Dr. Quiring found, shows a significant dif- 

 ference favoring the subarctic rodents, the Carnivora, and 

 the ungulates. The heart coefficient of the whales was found 

 to be on the same level as that of the tropical ungulates. 



The differences between the northern and the tropical 

 animals studied, when expressed numerically, Dr. Quiring 

 found to be as follows: 



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