CHAPTEE XXVII. 



GLACIAL AND PREGLACIAL LAKES AND 

 RIVERS. 



Since the recession of the ice, preglacial 

 lakes have been filled up and are now dry land, 

 and river beds have been changed so that 

 new channels have been cut and new lakes 

 have been formed. Even the imagination, 

 that wonderful architect, with all its tenden- 

 cies to exaggeration, palls in its attempt to 

 give expression in measured quantities to the 

 mighty power exerted by the great glacier or 

 combination of glaciers that existed in com- 

 paratively recent times. I say recent times, 

 because even 10,000 years is only a mere point 

 of time when compared with the actual age of 

 our globe. 



Some years ago, in company with Dr. 

 Wright, author of the "Ice Age in North 

 America," I visited Devil's Lake near Bara- 

 boo, Wis. At this point are striking evidences 

 of the work of the ice age. Before the glacial 

 period the Wisconsin River made a detour 



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