INTELLIGENCE, POWER, 



mammals by means of inaccessibility and a minimum food 

 supply, the reptile maintains only a pilot light of energy. 



The fact that reptiles are evolved for negativity and fish 

 for positivity is shown in the following table, in which 

 reptiles and fish of approximately the same weight are 

 contrasted. 



Although fish are the most numerous vertebrate animals 

 in the world and occupy three-fourths of the earth, in their 

 struggle for existence they are limited to from I to 2 per 

 cent oxygen tension in contrast to 20 per cent oxygen ten- 

 sion available to warm-blooded land animals. Therefore, 

 because the fish has at its disposal far less oxygen than has 

 the warm-blooded animal, we should expect to find the size 

 of the brain, the heart, and the thyroid gland in a fish 

 smaller than in a warm-blooded animal of the same weight. 



This fact is illustrated in the table on page 115, which 

 presents comparisons of two groups, in each of which are a 

 fish and a mammal of nearly the same body weight. 



In warm-blooded animals, heatstroke is the universal 

 ceiling that limits the size of the brain, the heart, the blood 

 volume, and the thyroid gland. 



114 



