AND PERSONALITY 



In the great Budonga forest in Uganda, in the midst of a 

 tropical vegetation in which the trees tower 150 feet or more 

 in height and the undergrowth is so thick that the only 

 means of penetration is to follow the elephant trails, Dr. 

 Quiring and Mr. Fuller collected an adult male and an 

 adult female chimpanzee. Pulling themselves up into these 

 giant trees, leaping fantastically from bough to bough, 

 lolling in the sunshine, and tending their young, chattering, 

 screaming, bickering, these great anthropoids looked as 

 large as men in the dimly sunlit forest. 



The brain of the II 5-pound male chimpanzee weighed 

 440 grams, the brain-to-body-weight ratio being 1 : 129. The 

 female, which weighed 97 pounds, had a brain that weighed 

 325 grams, the brain-to-body-weight ratio being 1:135. 

 According to the power formula, the size of the brain for 

 the male chimpanzee was 1.179 an< ^ f r tne female, 0.8978. 



A comparison of the chimpanzee with an African antelope 

 of approximately the same weight shows, as seen in the 

 following table, that the chimpanzee has a larger brain and 

 larger adrenal glands, whereas the thyroid glands in the 

 two animals are relatively the same in size. The adrenal 

 glands in the chimpanzee are twice the weight of the thyroid 

 glands, whereas the thyroid and adrenal glands in the 

 antelope are nearly balanced in weight. The significant fact 

 in this comparison is the unique size of the brain in the 

 chimpanzee, indicating greater intelligence. Superior intel- 

 ligence in the chimpanzee is associated with large adrenal 

 glands, whereas in man, superior intelligence is associated 

 with a large thyroid gland. 



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