472 HEREDITY AND ENVIRONMENT 



draw on special occasions, that gives us the 

 sense of freedom. 



In his inspiring address on "The Energies 

 of Men" William James showed that we have 

 reservoirs of power which we rarely tap, great 

 energies upon which we seldom draw, and that 

 we habitually live upon a level which is far 

 below that which we might occupy. Darwin 

 held the opinion, as the result of a lifetime of 

 observation, that men differ less in capacity 

 than in zeal and determination to utilize the 

 powers which they have. In playful comment 

 on the variety and extent of his own life work 

 he said in modest and homely phrase, "It's 

 dogged as does it." It may be objected that 

 the zeal and determination were inherited, but 

 here also the hereditary possibilities become 

 actualities only as the result of use, training, 

 the formation of habits. 



It is generally admitted that no constant 

 distinction can be recognized between the 

 brain of a philosopher and that of many a 

 peasant. Neither size nor weight of brain nor 

 complexity of convolutions bears any constant 

 relation to ignorance or intelligence, though 



