1392.] 
477 
,[i>avis. 
respect to the scanty remnants of lake sediments. As compared 
with these the buried river channels seem to be easier to trace, 
though of course affording less accurate information. 
In this connection and as possibly pertaining to the general in- 
terglacial hydrography of the Great Lake basin, I may perhaps 
mention the common occurrence of waterworn pebbles in the 
drumlins west of Syracuse as these may very likely be derived 
from buried shore-lines belonging to the same interglacial lake 
as the interesting deposits east of Toronto. 
Finally I will emphasize, that the purpose of this paper is much 
less to give an ultimate solution of the different complex problems 
connected with the continental changes of level, than to show a 
way by which, I think, such a solution can be reached with as 
little loss of time as possible. 
From the details already determined in North America as 
well as in Europe, it is ovident that the changes of level are 
closely connected with the local structure of the earth’s crust and 
with the local extension of the glaciations ; and thus it is conclu- 
sively shown that no changes whatever in the level of the 
sea can account for the phenomenon. 
Notwithstanding all doubts as to the possibility of vertical up- 
lifts of the great continental portions of the earth’s crust, we may 
already be fully justified to use about this with a new meaning the 
well known words of Galilei : “ Yet it does move.” 
THE SUBGLACIAL ORIGIN OF CERTAIN ESKERS. 
BY WILLIAM MORRIS DAVIS. 
(Walker Prize Essay, 1892.) 
CONTENTS. 
1. 
The relation of climate to the forms of the waste 
of the land on its way to the sea. 
page 478 
2 
Glacial deposits in general. 
. 
480 
3. 
Marginal washed glacial deposits. . 
4&1 
4. 
Method of investigation here adopted. . 
482 
5. 
The problem of this essay. 
483 
6 . 
The Auburndale district. 
484 
7. 
The sand plateaus. .... 
484 
