> 
60 : Proceedings of the British Associa tic gee: 
the masses of ice, not being there confined between two sides of 
a valley, their movements were in some respects different,—the 
boulders not being connected in continuous ridges, but dispersed 
singly over the Jura at different levels. Prof. A. conceives that at 
a certain epoch, all the North of Europe, and also the North of Asia 
and America, were covered with a mass of ice, in which the ele- 
phants and other mammalia found in the frozen mud and gravel 
of the arctic regions, were imbedded at the time of their destruc- 
tion. He thinks that when this immense mass of ice began 
quickly to melt, the currents of water that resulted, transported 
and deposited the masses of irregular rounded boulders and gravel 
which fill the bottoms of the valleys; innumerable boulders hav- 
ing at the same time been transported together with mud and 
gravel, upon the masses of the glaciers then set afloat. Prof. A. 
announced that these facts are Pxplained nt length in the work 
which he has just published, ‘ Etudes sur les Glaciers de la Suisse,’ 
illustrated by plates. ; 
Mr. Jeffreys detailed an experiment he had made on a very great 
scale, to decide the question, whether silicious matter could be 
dissolved largely by water, or what is the same thing, by its va- 
por. ‘This experiment formed the subject of a paper, read some 
months ago before the Royal Society, and by the experiment a 
solution of more than 200 lbs. of silica was effected in steam, at @ 
heat exceeding that of fused cast-iron. ‘The steam was not un- 
der pressure, but was conducted into a large kiln used for stone 
pottery. The silica was not only dissolved, but carried away in 
the vapor, and some pounds weight of it were deposited from the 
vapor, before it issued from the kiln, like ahoar frost, upon some ar- 
ticles in the kiln, where the temperature was not above a red heat. 
The following papers were also read, but our limits permit us 
te, ive only their titles. 
1 the relative level of — and sea, at on the alteration of the east coast of 
bared, by Mr. Steven 
“ the superficial beds in the neighborhood of Glasgow ; by Mr. Smith of Jordan 
: on the Geology of Canada; by Capt. Baddeley. 
On the Silurian rocks of ae ge 53 on a rr of igneous rocks on the 
east re of the Berwyn range} 
neient sea cliffs and needles in ihe chalk of the valley of the Seine, in ae 
euindy “. Charles Lyell. ~ 
On the geology of the island of Arran; by A.C. sig" 
On the So of Castle Hill, seen | by tele: 
On the value of topographical maps an s, ae a map of the county of 
Mayo, in Ireland; by Mr. Bald. 
* ~*~» Si 
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