42 MAN AND THE GLACIAL PERIOD. 



pare our minds for almost anything that may be suggested 

 concerning the glaciated condition of other portions of 

 the earth's surface. The vera causa is sufficient to accom- 

 plish anything of which glacialists have ever dreamed. It 

 only remains to enquire what the facts really are and over 

 how great an extent of territory the actual results of gla- 

 cial action may be found. But we will first direct more 

 particular attention to some of the facts and theories con- 

 cerning glacial motion. 



