INTELLIGENCE, POWER 



gland, and the adrenal glands to the body weight could not 

 be expressed in a law, we turned from anatomy to physi- 

 ology to see if a fundamental law could be found to express 



ELEPHANT 



MAN 



ALLI&ATOR STEER* AHORSE 



CO * 



5 ALLI&ATOR 



< * 



-J CHIMPANZEE 



O &IANT*TURTLE 



_ PYTHON 



o 



5 RA Y LER RABBIT. CAT 



^ * EAGLE** CRANE 



* TURTLE 



FLAMINGO* 



I *OWL 



WILD RAT 



LIZARD* ^* GUINEA PI& 

 ALBINO RAT 



PI&EON 

 CANARY 



SPARROW 



OXIDATION IN CALORIES PER DAY 



1 l I 



10 100 1000 10,000 100.000 



FIG. 35. In relation to metabolism the weight of the thyroid gland shows a trenc 



but not a law. 



the relationship between the weight of the thyroid gland 

 and metabolism, the weight of the adrenal glands and 

 metabolism, and the weight of the brain and metabolism. 

 We plotted the weights of the thyroid glands against the 

 number of calories (oxidation or metabolism) generated in 

 24 hours in the animals that we had studied, including 

 insects, fish, reptiles, birds, rodents, hoofed animals, 

 carnivores, monkeys, baboons, anthropoids, and man. 



208 



