AND PERSONALITY 



With respect to these organs and tissues there is parity 

 between man and the wild and the domestic animals. 



A civilized man weighing 150 pounds would require 135 

 grams of brain to execute his basal or animal metabolism. 

 The remaining part of the brain of such a civilized man 

 would appear to consist of the vast evolution of the special 

 mechanisms cited and of a still greater evolution in the 

 white matter of the brain of the mechanism that executes 

 memory, reason, and imagination, or thinking. 



Thus in civilized man we find that the thinking brain is 

 780 per cent larger than is essential to execute his simple 

 basal metabolism. This 780 per cent represents the gift of 

 evolution to civilized man. It represents the weight of the 

 complicated mechanisms in the driving cortex or gray 

 matter of the brain and the weight of the infinitely complex 

 white matter of the thinking brain. It represents the differ- 

 ence between the intelligence, power, and personality of 

 civilized man and the intelligence, power, and personality 

 of the wild and domestic animals that obey the life line. 



215 



