1872.) 95 [Perry. 
view, how he has come to misconceive what he calls the glacier of 
‘the Connecticut, the glacier of the Hudson, the glacier of the Mo- 
hawk, and to speak of them as if they were under, and still distinct 
from, the creat ice-sheet that moved from north southward over the 
eountry. The fact is, New England, during what was its main ice 
period, had no local glaciers. One huge mountain—as it were a table- 
_land—of ice covered the whole region, filled all the valleys, planed 
the rocks, and did the manifold work that was done, of which the 
_ north-south striz still surviving are a part of the witness. In the 
opening of the glacial times, there were possibly, to me it seems 
there were probably, local glaciers which were finally swallowed up 
as the great winter of the ages advanced. The small local glaciers, 
of which we have positive knowledge, belonged to what was in New 
England the closing part of the Ice period, and were what remained 
of the great ice-sheet when it left the low lands, and the conditions 
for the maintenance of glaciers existed only in the higher regions. 
Thus Professor Dana’s presentation seems to be almost wholly un- 
true in the sense he gives to it, and in the manner in which he ap- 
pears to view the subject, when endeavoring to account for what he 
regards as abnormal furrows, and other kindred anomalies. 
The final wasting of the main ice-sheet must have introduced 
marked changes. While the iow lands were laid bare, remnants of 
ice must have been left in the high lands, filling most of the elevated 
valleys. Thus local glaciers would make their appearance on the 
reduction of the main mass of ice in New England. Last and west 
local ice-streams, and others of a limited character, no doubt, for 
the greater part and gradually, assumed courses determined mainly 
by the existing depressions. They would in a large measure, and 
in most places, especially in the more central portions of the valleys, 
wear off the legends of the Middle Glacial times, and write in their 
stead a new record, the lines of which might run in a more or less 
east-west direction, according to the trend of the valleys. And such 
is substantially what is now found to be true. Reference may be 
made, particularly, to the east-west valleys of the Green Mountain 
range; valleys, in which the existing strie are for the most part 
characteristic of the later Ice period. On the western side of these 
mountains, the high lands in the counties of Chittenden, Lamoille 
and Franklin are almost everywhere traversed by north-south drift- 
marks of the main ice-mass, while the valleys of the Winooski, of 
_ the Lamoille and of the Missisquoi which cut through the Green 
