INTELLIGENCE, POWER, 



were massive, showing that the rhinoceros is equipped for 

 explosive attack. 



The adrenal glands were elongated. They weighed 88 

 grams. Incising one adrenal gland, we found that the 

 medulla was approximately half the total volume of the 

 gland. In man the medulla is one-tenth the total volume of 

 the gland. 



The thyroid gland was elongated vertically and weighed 

 53.05 grams. There was no isthmus. 



This dissection showed that the rhinoceros possesses the 

 equipment of a high-powered, flexibly armored mechanism 

 adapted to bush life. Through the high development of the 

 adrenal-sympathetic system and the heavy muscles massed 

 in five areas and vascularized and oxygenated by a large 

 heart, a large vascular tree, and large lungs, this old-world 

 beast is geared for powerful attack. This dissection showed 

 that the rhinoceros possesses a mechanism adapted for 

 instantaneous mobilization of energy. As indicated by the 

 prominent development in the brain of the olfactory lobe 

 and a lesser development of the ophthalmic area, it is 

 obvious that a rhinoceros apprehends danger primarily 

 through the sense of smell. Since the rhinoceros is un- 

 predictable and implusive in behavior, the association tract 

 of the brain was, as we expected, small, indicating a low 

 order of intelligence; but the high development of the 

 adrenal-sympathetic system indicated an unstable tempera- 

 ment. The rhinoceros exhibits curiosity and indifference or 

 curiosity and attack. By reason of the relatively small brain 

 and the small thyroid gland, in contrast to the relatively 

 large brain and large thyroid gland of man, it is inconceiv- 

 able that this great pachyderm could either develop 

 exophthalmic goiter or intelligence. 



Inasmuch as there are many conflicting opinions as to the 

 prowess of the rhinoceros and the African buffalo, it is 

 interesting to compare the energy-controlling organs of 

 these two animals. The table that follows shows that, 



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