Association of American Geologists and Naturalists. 159 
sented ; since it could not, ‘owing to the trend of the coast of Newfound- 
land; have entered the Gulf to the westward of the point designated, but 
on the contrary was likely to have done so farther eastward. Moreover, 
as it could by no possibility have reached the spot where he fell in with 
it, without having been driven across the Gulf Stream into the westerly 
eddy, it was obvious that unless the heave southwestward by the north- 
easterly wind and swell were admitted, it must have been for a much 
longer period in the Stream and finally emerged to the southward of it, 
ata point much farther south and east than he had assumed in his eal- 
culation of its course. 
That a mass of ice so considerable should remain after so long a 
sojourn amid the warm waters of the Stream, would not, he observed, 
appear surprising, when the enorntous magnitude of some of the mass- 
esthat have been encountered by voyagers in these seas was taken 
into account ; together with the fact that they produce by their disso- 
lution, carry about with them, and occasion to a great distance around 
them, a very material decrease of temperature, both in the air and 
ocean, which tended to render the operation a much more gradual one 
than we might at the first glance imagine. From the record of a jour- 
nal kept by Francis D. Mason, Esq., in June, 1810, on a passage from 
New York to Halifax, N. S., and published in Blunt’s American Coast 
_ The last iceberg of which Mr. C. was prepared to speak from per- 
sonal observation, was encountered by him on the 4th of March, 1841, 
in the Pacific Ocean, during a passage from the Hawaiian islands to 
Boston. It was of great magnitude. “Its height could not have been 
less than two hundred and eighty or three hundred feet, and its longest 
diameter two thirds of a mile. The ship sailing at the rate of seven 
miles an hour, was two hours and three quarters in coming up with it 
