INTELLIGENCE, POWER, 



other large animal. This fact alone proves that the animal 

 man must have evolved advantages which had survival 

 value so fundamental that swift and powerful muscular 

 action, a more nearly perfect sense of sight, hearing, and 

 smell, perfect digestion, a complete equipment for running 

 with the herd at the time of birth, and body covering of hair 

 or wool or fur had no survival value for man. Yet man pos- 

 sesses no organ or tissue not possessed by other animals. 



The equipment by which man rose from the level above 

 that of the great ape was provided through a further 

 development of the factors by which the great ape differ- 

 entiated from the lion, the wolf, and the antelope. 



What, then, is the net result of the subtractions and 

 additions of this analysis of man compared with other 

 animals ? It is that through the unique evolution of three 

 organs and three organs only acting in synthesis, there 

 was conferred upon man his superior position among all 

 animals. These three organs conferred upon man so great a 

 survival value that muscular power alone, teeth and claws 

 alone, fur and hair and wool alone, sight and hearing and 

 smell alone, the heart and blood alone and the adrenal 

 medulla alone lost their survival value. It was this creative 

 trinity the brain, the thyroid gland, and the upright pos- 

 ture that yielded the manipulative apelike hand that had 

 survival value to the great-ape ancestor of man who came 

 down from the trees. The long legs and arms of the distant 

 ancestor provided a larger surface for regulating his inter- 

 nal temperature, thereby permitting the evolution of a 

 larger brain and a larger thyroid gland and, in consequence, 

 a greater intelligence, power, and personality. 



It was through this creative trinity the brain, the 

 thyroid gland, and the manipulative hand that man was 

 enabled to utilize energy external to himself. In this single 

 characteristic man is distinguished from other animals. 

 This new formula placed at the disposal of man the im- 

 measurable living and nonliving energy in the world. 



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