AND PERSONALITY 



At this point it is worth while to consider the opposite, or 

 counter, evolution, seen through breeding by man. I refer 

 to the selective breeding of the thoroughbred. The ancestors 

 of the thoroughbred came upon the scene later than the 

 ass, and the stage was quite different. The ass belonged to 

 the time of the shepherd kings. The high-tempered horse 

 came from the colder north and fitted into the picture of 

 man at war. The high-tempered horse carried impact and 

 surprise. It was the high-tempered horse, not the lethargic 

 ass, that speeded the chariot. 



The versatile energy system changes with the seasons. 

 As a seasonal adaptation, the thyroid gland of man and of 

 animals becomes larger in winter than in summer. So, too, 

 the thyroid gland made its adaptation as animals migrated 

 from a warm to a cold climate and from a cold to a warm 

 climate, thus bringing about a selective evolution. 



In the winter the brain is more active. Other factors 

 being the same, a more active brain is required to produce 

 a greater amount of energy. Oxidation is required to main- 

 tain the warm-blooded temperature of 98.6 all day, all 

 night, all the year round. Thus we account for the large 

 brain, the large heart, the large thyroid gland, the more 

 highly vascularized muscles, and the highly energized 

 temperament of the cold-adapted Shetland pony, the 

 most easily trained circus pony known. These qualities 

 and characteristics of the Shetland pony, in contrast 

 with those of the lethargic ass, devoluted from a wild, 

 natural, selective state of higher energy to the energy 

 level of the tropics. The ass explains the mule. The ass 

 explains the sheep. The horse, the sheep, the goat, the cow, 

 the pig, the hen, all profited by man's intelligence. Unless 

 man can benefit his domestic animals the domestic animal 

 will degenerate and disappear as a species. 



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