gave us the law of species. For most birds 

 and animals these common facts and their 

 meaning are now well known, and it is a 

 wearisome and thankless task to go over 

 them again. The origin of species and the 

 law of gravitation are now put in the same 

 comfortable category with the steam engine 

 and the telegraph wire and other things that 

 we think we understand. Meanwhile the air 

 has unseen currents that are ready to bear 

 our messages, and the sun wastes enough 

 energy on our unresponsive planet daily to 

 make all our fires unneces- 

 sary, if we but 

 understood. 

 Meanwhile, i n 



