158 WHAT EVOLUTION IS 



In harnessing the energies of nature 

 man has discovered and perfected 

 tools. Few other animals use tools. 

 Monkeys and apes have their sticks 

 and stones, but it took man to fash- 

 ion them into serviceable shapes, 

 to discover metals, to build engines, 

 steamships, and airplanes. Man's 

 tools were amongst his first posses- 

 sions and not till he acquired the habit 

 of preserving them and passing them 

 on to future generations did society 

 progress. The race that buries with 

 the primitive artisan the choice ob- 

 jects of his life's work never goes 

 forward. Even the rude tools of one 

 generation must be put in the hands 

 of the next, if real progress is to be 

 made. In this sense the inheritance 

 of property separates man from most 

 other animals. 



Another trait in which man is pe- 

 culiar is in the possession of a com- 



