GREAT STEPS IN EVOLUTION 111 



sciously degenerative, and as far as possible, 

 parasitic the field of effort opens. Hygiene, 

 engineering and irrigation, agriculture and 

 forestry, and all such strenuous careers are 

 already opening perspectives lately un- 

 dreamed by youth, struggles for existence 

 nobler and more sustainedly strenuous than 

 those of war. Practically, the control of the 

 ice-lands and of the tropics, the amend- 

 ment of nature and above all, specula- 

 tively, the distinction between ascending 

 and deteriorative progress thus alike be- 

 come more clear. 



