THE DRIFT AND GEOLOGIC TIME 743 
I have not attempted in this article to exhaustively discuss 
the evidence of the slow motion of the ice in the Laurentide 
glacier. Much more could have been said on that point, but any- 
one who has followed the recently published studies of glacial 
phenomena in Greenland by Chamberlin, Salisbury, and others, 
will be able to supply most of the deficiencies in my argument. 
The present paper is simply the statement of views that were 
suggested by a consideration of some aspects of the glacial 
theory as an amateur geologist. 
I wish to also acknowledge here my indebtedness to Profes- 
sor T. C. Chamberlin for valuable suggestions on certain points 
here discussed. 
H. M. Bannister, M.D. 
CHICAGO. 
