96 READINGS IN EVOLUTION, GENETICS, AND EUGENICS 
Man is hardly as yet subject to Malthus’ law, for while he is 
increasing more rapidly than any other animal, owing largely to the 
care of the young which makes the expectation of life of the new-born 
relatively very high, his migratory ability, but above all his intelli- 
gence, save him from the application of the law. A single new dis- 
covery such as that of electricity may increase his food supply and 
other life necessities several fold. His future evolution, in so far as 
it is progressive, will be mental and spiritual rather than physical, and 
as such will be the. logical conclusion of the marvelous results of 
organic evolution. 
