present tropical standards." He calls attention to the fact 

 that "... people living in a climate where body heat loss 

 can be readily accomplished have a higher internal combus- 

 tion level, grow more rapidly, mature earlier, reach a larger 

 stature, are more resistant to infectious disease, and have a 

 greater abundance of both physical and mental energy 

 than do those living under conditions of moist warmth. 

 Health in temperate-zone countries has thus a more dy- 

 namic quality than in tropical warmth. But with this push 

 and vigor goes a much greater rate of body breakdown 

 from the more stressful existence." 



Three factors make up climate: the variables of tempera- 

 ture, the variables of humidity, and the variables of storm. 

 The zone of greatest variation in temperature is seen not in 

 the tropics or in the arctic but in the temperate zone. 



Temperature alone has an influence on the size of the 

 brain, the size of the thyroid gland, the size of the heart, 

 and the volume of blood of all warm-blooded animals. 

 Temperature has no influence upon the size of the adrenal 

 glands. Dr. Quiring, by applying the power formula, has 

 exhibited graphically the powerful influence of cold itself 

 upon the brain, the thyroid gland, and the heart. 



When we recall that 75 per cent of the food intake in 

 warm-blooded animals is required to maintain the warm- 

 blooded state and take into consideration the abrupt 

 changes in temperature and the variable factors in climate 

 seen in the temperate zone, it is clear that the factor that 

 raised and maintained the high-energy state of civilized 

 man is no more mysterious than the fact that a larger heat- 

 ing plant is required in winter than in summer to maintain 

 adequate temperature in a house. To the simple brain- 

 thyroid formula and to the variables of climate and storm, 

 civilized man owes the basis for what he is. 



Let us now consider the variables that affect the heating 

 plant of man. 



If the heating plant of man burns too intensely his proto- 



238 



