162 Association of American Geologists and Naturalists. 
material. It then is forced off by a strong off-shore wind, and after 
drifting still farther north is stranded again, perhaps at a long distance 
from its first anchorage. New overturns follow, fresh materials are 
accumulated, but from waste, the whole mass becoming lighter, it is 
once more floated off, and pursuing a somewhat devious course toward 
the tropics, is gradually melted away. Could that part of the ocean’s 
bed over which such an iceberg has passed be laid bare for our inspec- 
tion, what would be the appearances presented? The early progress 
of the mass would be marked by a deposition. of large angular frag- 
ments of polar rocks. Subsequent to the overturn there would be an 
interval with few or no traces of its path, till’ the rocky portion of the 
berg had resumed its original situation, when the deposition would 
continued, and these alternations would evidently correspond to the 
number of overturns. The larger masses of rock would for the most 
part be-the first to drop out, and latterly the majority of matter might 
consist of smaller and more rounded fragments, such as had been 
worn by the grinding of the ice on the beach or bottom. Prior to the . 
last, or even the first stranding, all, or nearly all the rock and earth 
originally contained in it might be deposited, when the latter portion, of 
its track would be marked by a comparatively scanty amount of ma- 
terial from its more recent halting places, perhaps confusedly mixed, 
and affording here and there some slight indications of the birth-place 
of the co in the occasional presence of a fragment of the remote 
Was dice mates asked Mr. C., in the evidences of aac queer, 
glacial action, analogous to such a mixed deposition, and irregular dis- 
tribution of materials from widely separated localities, as would result 
from the conjectural case here presented, or the actual one of the ices 
—— previously cited as fallen in with on the southern margin of the 
f Stream? Did they explain any of the obstacles and apparent 
ieee presented by the aqueo-glacial theory of the drift formation ? 
These were questions which he submitted for the decision of those 
whose attention had been more specially directed.to this subject-.. 
_ In reference to the advance and northern limits of icebergs from the 
Antarctic in the eastern hemisphere, Mr. C. could state nothing from 
his personal knowledge, farther than that they frequently occur at least 
as low as the thirty-fifth parallel of Jatitude. During his residence 7 
See Rentals, in he: summer and automa of 1839-40, (Decem- 
England , reported 
aii icebergs i in the vicinity of the Cape of Good 
Hope, Se tine Sieh on nearest southern land ; along, the 
whole of , ees — demerit sureriol from. theit 
Bie EER ee ag : 
