INTELLIGENCE, POWER, 



The adrenal gland weighed 2.07 pounds; the thyroid 

 gland weighed 1.89 pounds. Except in of the arctic, larger 

 adrenal glands than thyroid gland is the pattern of the leaf 

 and the grass eaters the world over. 



The elephant needs crisis energy for extricating himself 

 from the swamp and for climbing the mountain side in 

 other words, for meeting the mechanical vicissitudes of his 

 daily life. 



The energy principle involved in the mechanism of the 

 elephant we shall see more clearly by comparing the mecha- 

 nism of the mouse with that of the elephant. In the mouse 

 the adrenal gland is nine times as large as the thyroid 

 gland. This is a pattern of insecurity. Although the mouse 

 is a well-adapted animal, it lives a very precarious life. 

 The mouse represents the highest degree of adrenalism 

 known. 



Because of the large surface in relation to the body weight 

 of the mouse, the rate of cooling in the mouse is many 

 times greater than that in the elephant. Relatively, the 

 brain of the mouse is much larger than the brain of the 

 elephant, the ratio being 1:33 in the mouse and 1:1164 ' m 

 the elephant. In the elephant it is the principle of heat- 

 stroke that limits the size of the brain-heart-thyroid- 

 adrenal-sympathetic system. 



The elephant is slow; the mouse is quick. The difference 

 in the energy tension of these two animals is due to the 

 high rate of metabolism per unit of mass in the mouse and 

 the low rate of metabolism per unit of mass in the elephant. 

 The difference is due primarily to the great facility for 

 cooling in the mouse and the low facility for cooling in the 

 elephant. 



Comparing the high-tensioned mouse, with its heartbeat 

 of 300 per minute, and the elephant, with its nearly glacial 

 movements an'd its heartbeat of 28 per minute, we find 

 that the life span of the mouse is about two years, and that 

 of the elephant from eighty to ninety years. 



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