AND PERSONALITY 



for growth, the animals supplying these products require 

 the special function of the thyroid gland rather than the 

 function of the adrenal-sympathetic system. The biochem- 

 ical energy required to produce a steak, an omelet, or a 

 thick growth of wool, is the product primarily of collabora- 

 tion of the brain and the thyroid gland to provide a high 

 level of constant energy. 



Outburst energy, produced by adrenalin, such as is 

 manifested in fright or anger, would interfere with the 

 quiet growth of the lazy sheep, the idling cow, and the 

 stuttering hen. Thus man has bred his domesticated animals 

 toward serenity, to the end that every bit of food energy be 

 converted into wool and meat and eggs and milk and not 

 wasted by fighting or running or fright. 



The adrenal-sympathetic system exerts a sensitive con- 

 trol over the digestion of animals. Note the psychic serenity 

 that is desirable for the cow in a milk-producing contest. 

 So sensitive is the brain-adrenal-sympathetic system that 

 during milk trials the presence of a quiet visitor or the 

 change of clothing of attendants may change the milk 

 production. 



In the domestic dog we have a further example of breed- 

 ing and training. This is particularly true in the case of 

 the greyhound. Whereas all dogs that hunt by scent have 

 the wolf pattern of brain-heart-thyroid-adrenal glands, the 

 greyhound, which runs not by scent but by sight, has 

 developed, over years of breeding and training by man, a 

 race-horse pattern of energy organs that empowers him to 

 overtake his prey in a short rush. The energy organs of the 

 greyhound follow the pattern of a short sprint at high 

 speed. 



Note the adrenal predominance in the racing grey- 

 hound from Memphis, Tennessee, in contrast with the 

 thyroid predominance in the pursuing Timber Wolf from 

 northern Minnesota. Cold is a factor in the size of the 

 thyroid gland. 



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