INTELLIGENCE, POWER, 



intellectual work, the brain is equally the executive for 

 crisis energy. In combating an infection with a fever, in 

 fighting or fleeing from an enemy, in the expression of the 

 emotions, the adrenal glands and the sympathetic system 

 inhibit the thinking or new brain and violently stimulate 

 the old or energy brain that executes fighting, escaping and 

 emotion. 



Thus two types of energy can be discerned among ani- 

 mals. In each the brain is the executive. In one synthesis 

 the brain is the executive and the adrenal glands are the 

 excitants of outburst oxidation. The brain cells mobilize 

 executive energy, the pounding heart increases the negative 

 electric potential of the trillions of red blood cells, the 

 respiration is accelerated, and the entire energy mechanism 

 for executing violence is mobilized. 



The adrenal glands play a lesser role in the mobilization 

 of constant energy. The constant energy necessary for 

 adaptation to cold or to constant muscular work, such as is 

 required for a long migration, a long chase or by the por- 

 poise and the whale for rising at frequent intervals day and 

 night to the surface of water to breathe or by man in his 

 daily task, is established by a synthesis of the brain and the 

 thyroid gland, the heart and the blood volume. 



Evolution of the higher animals centered in muscular 

 power. Muscular power is controlled by the joint action of 

 the positive side of the metabolic arc, the brain, and the 

 negative side of the metabolic arc, the heart and the red 

 blood cells. 



The constant tempo of the brain and the heart is con- 

 trolled by the hormone thyroxin, the product of the thyroid 

 gland. The emergency tempo of the brain and the heart is 

 controlled by the hormone adrenalin, the product of the 

 medulla of the adrenal gland, and the hormone sympathin, 

 the product of the celiac ganglia and sympathetic plexuses. 

 The energy of the whole is derived from oxidation that com- 

 pletes the trillions of metabolic arcs within the animal. 



34 



