INTELLIGENCE, POWER, 



adrenal glands, we endeavored to find a law that would 

 express the relation between the weight of the brain of an 

 animal and the metabolism of that animal in 24 hours. 



woo 



HORSE 



*PIG 



PIG 

 SHEEP 



HORSE 

 

 STEER 



CASSOWARV 



OPOSSUM* HERON 



BITTERN* &IANT TURTLE 

 SQUIRREL ^GUINEA PIG 



C^!E - W1U>RAT 

 STARL,N & SJ 



TURTL 



PCRCH* M USE 

 BAT BLUE RACtR 



SUK> 



WOOOROACH 



WMM 







BULLFROG 



GRASSHOPPER 



HORNED TOAD 



, i i , ,inl 



OXIDATION IN CALORIES PER DAY 



FIG. 37. In relation to metabolism the weight of the brain shows a law. 



We found a law, so fundamental that it embraces insects, 

 fish, reptiles, birds, rodents, ungulates, and carnivores, but 

 not higher apes and man. This law is expressed by the ratio 

 between the weight of the brain of an animal and the 

 number of calories produced by that animal in 24 hours. 



We found that I gram of brain is required to produce 

 12,115 small calories in 24 hours; that is, the ratio of the 

 weight of the brain to the heat production in small calories 

 is I to 12,115. Into this brain metabolism law or "life 

 line" all animals fall except those animals whose "think- 



210 



