118 TRANSACTIONS OF SCIENTIFIC SECTION. 
It is then evident that the heavy falls of snow will be 
near the borders of the boreal portions of the continent, 
while the interior parts will be thinly covered. More- 
over, the elevated borders, are, by. their elevation, better 
fitted to be the locus of thick ice-sheets than the low hills 
of the interior basins. 
There is found to be a close correspondence between 
these principles and the facts shown by the glacial phe- 
nomena observed. There appear to be two great ra- 
diant centres of enormous glacial deposition in north- 
ern Canada and the United States—one in the re- 
gion around Hudson Bay, the other in Alaska. From 
these the great glacier movements radiated, while to the 
north of the central portion of North America the gla- 
cial sheet was thin, and at intervals, perhaps, entirely 
intermitted. Greenland has, of course, always been a 
‘‘olacial radiant.’’ In Europe, the glacial radiant for 
England, Germany and Russia was the Scandinavian 
peninsula. There is no reason to suppose that any thick 
sheet of ice existed continuously, and at great elevation, 
in the insular or archipelagic portions of the Arctic re- 
gions. Fora full discussion of this interesting subject, 
reference is made to the paper of Dr. Claypole, above 
cited. 
It is estimated by Professor W. Upham that, in the 
- culmination of the two principal glacial epochs, the thick- 
ness of the ice-sheet on the Laurentian highlands, and 
in the basin of James Bay, and over the south part of 
Hudson Bay. was from 10,000 to 12,000 feet. 
MARCH 12, 1889—SEVENTY-FIRST REGULAR MEETING. 
The meeting was of a social and informal character, no 
paper being presented. 
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