ORIENTATION OF MENTAL IMAGERY 301 



modern science evolved, was man's purposeful usage of 

 more stable objects, and of more measurably responsive 

 physical instruments to supplement or enlarge the lim- 

 ited powers of his senses, and to check, or control, his 

 estimates of sensory response. These objects and in- 

 struments enabled man to broaden his experience by 

 observations and experiments in new fields; to increase 

 the accuracy and capacity of his memory by the use 

 of records and statistics from countless sources other 

 than himself. Human authority then lost its suprem- 

 acy and surrendered to the democracy of common 

 things. 



To distinguish the true from the false, science sub- 

 mitted man's imagery to the supreme court of na- 

 ture, resting its cases on the evidence of the yardstick, 

 the balance, and the clock, and upon the total testimo- 

 nies of the multitudes. On these multiplied verdicts 

 of nature, confirmed and reconfirmed by nature her- 

 self, is based man's supreme contribution to his own 

 salvation and welfare. Man was thereby able to ver- 

 ify his trial guesses. And it was but yesterday that 

 man, for the first time, could confidently affirm that his 

 imagery of progress was indeed a reflection of reality. 



The reality of this world progress, this lawful ac- 

 tion of nature, under whose directive discipline man 

 upbuilds all his edifices, is called Evolution. It is but 

 another way of saying that nature grows, and grows in 

 a self-regulated, profitable way. 



