AND PERSONALITY 



the thyroid gland, the heart and blood volume and, in 

 consequence, to the highest degree of physical and mental 

 activity. 



FIG. 41. Temperature variability or storminess over North America. (Base 

 map courtesy of Denoyer-Geppart Company, Chicago. Reproduced from Clarence A. 

 Mills, Ph.D., M.D., "Medical Climatology.") 



High physical and mental activity, as will be shown 

 later, is the common basis of both civilization and the 

 diseases that are peculiar to civilized man. They are tied 

 to each other by the common basis of high energy. In 



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