; 
4 
Conglomerates with Gneiss, Talcose Schists, &e. 391 
The result is, a conviction that the facts which ve given 
respecting the conglomerates, are only another phase of the phe- 
nomena Ti b ese eminent geologists. If the facts 
of most of the rocks, correspond with those which I have ex- 
pressed. If I am wrong, then, I have the consolation of being in 
good company. : ; 
Prof, Tyndall, in his recent work on the Alpine Glaciers, has 
referred to an interesting specimen in London, analogous to the 
conglomerates of Rhode Island and Vermont. 
n the museum of the Government school of Mines, he says, 
“we have a collection of quartz stones placed there by Mr. 
Salter, and which have been subjected to enormous pressure, in 
the neighborhood of a fault. These rigid pebbles, have in 
some cases, been squeezed against each other so as to luce 
&.mutual flattening and indentation, Some of them have 
yielded along planes passing through them, as if one hal: 
slidden over the other; but the reattachment is very strong. 
Some of the larger stones, moreover, which have endured pres- 
sure at a particular point, are fissured radially around the point, 
In short, the whole collection is 2 most instructive example of 
the manner and extent to which some of the most rigid substances 
Am. Jour. Sctr—Szconp Serms, Vou. XXXI, No. 93.—May, 1861. 
51 
