xxvi CONTENTS. 



PAGE 



Total thermal efficiency of the atmosphere, 673. 



IV. The Localization of the Glaciation 674 



Tentative conception of the " fixed lows " and their rela- 

 tions to glaciation, 674. Probable geographic features of the 

 glacial stage, 675. The hypothetical development of localized 

 glacial conditions, 676. Alternative views, 676. 



Geological Map of the United States and Part op Canada 



to face 218 



