212 EVOLUTION AND SOCIAL PROGRESS 



time is ample to account for all known facts re 

 lating to this development.&quot; 17 



So too that expert geologist Prestwich limits 

 the entire Glacial Period to only 25,000 years. 18 

 The evidence of science, therefore, does not com 

 pel us to go beyond 10,000 years in calculating 

 the entire period of man s existence upon earth. 

 Similar conclusions were those drawn at a com 

 paratively early period by Dr. Andrews in regard 

 to the age of man in America from his study of 

 the raised beaches of Lake Michigan. To these 

 deductions J. W. Dawson, former Principal of 

 McGill University, Montreal, thus referred : 



The deliberate and careful observations of Dr. Andrews on 

 the raised beaches of Lake Michigan observations of a much 

 more precise character than any which, in so far as I know, 

 have been made of such deposits in Europe enable him to 

 calculate the time which has elapsed since North America 

 rose out of the waters of the Glacial Period as between 5,500 

 and 7,500 years. This fixes at least the possible duration of 

 the human period in North America, though I believe there are 

 other lines of evidence which would reduce the residence of 

 man in America to a much shorter time. u 



To show on the other hand the absurdity to 

 which such contentions as those of Professor 

 Penck must lead when he extends the possible 

 length of the Glacial Period to over 500,000 

 years, leaving from 250,000 to 500,000 years for 

 the antiquity of man in Europe, Sir Bertram Win- 



17 See Windle &quot;Church and Science,&quot; pp. 266, ff. 



18 Ibid., p. 269. 



&quot;&quot;Story of the Earth and of Man,&quot; pp. 295, 296. 



