AND PERSONALITY 



which each of these three systems contributes an essential 

 part. These units of energy transformation consist of a 

 voluntary muscle fiber, or furnace, a nerve end plate on the 

 wall of the muscle fiber representing a positive pole, and 

 red blood cells in the capillaries representing a part of the 

 negative pole. These energy units in delicate electric 

 balance between the positive and the negative poles await 

 the nerve stimulus from the brain. This nerve stimulus of 

 the end plate on the wall of the muscle fiber closes the arc 

 by oxidation. Thus are heat and muscular action adaptively 

 produced. 



The brain and the heart are axis partners in maintaining 

 the constant electric force in the metabolic arc that keeps 

 alive the animal and the man. These two tireless organs, 

 working day and night, respond to every changing stimulus 

 from the special senses, common sensations, the emotions, 

 to the stimulus required for labor in the fields, for executive 

 work in industry, for the duties required of a president of a 

 bank or of a professional man. 



The thyroid gland has the unique power of controlling 

 the level of activity of this energy team, higher in the north, 

 where the climate is cold, higher in the winter as compared 

 with the summer. The constant working tempo is controlled 

 by the thyroid gland, and the outburst energy required for 

 the expression of the emotions is executed by the brain and 

 the heart through flash oxidation controlled by the adrenal 

 glands. 



In civilized man we find a larger brain, a larger thyroid 

 gland, and a larger heart and volume of blood than in 

 native man in the tropics. The hard-working brain, the 

 lead horse in this energy team, is so overworked that there 

 were in the United States, in 1939, 606,394 beds for mental 

 and nervous diseases. This is eloquent testimony of the role 

 of the brain in civilized man. 



The brain and the heart muscle have a higher metabolism 

 than any other organ of the body. They perform the greatest 



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