Mineralogy and Geology. 123 
The quarries at LeRoy are in the Corniferous. Going east from the 
village about a mile, on the road to Caledonia, then turning into the first 
$ 
corals are mostly silicified, and the rock may be removed by digesting in 
chlorhydric acid, leaving them in their original perfection. 
Note.—Many of the fossils of the Hamilton shales are composed of 
carbonate of lime. When this is the case the shale may be removed, 
without injuring the fossil, by letting bits of caustic potash dissolve upon 
it. e work proceeds quite rapidly where the shale is free from impuri- 
ties, but an admixture of lime retards, though it does not altogether stop 
it. Also when very cold the potash acts slowly. R 
Mt. Morris, Aug. 26, 1865. ” 
Society, ix, 135, the author states the following among many other inter- 
esting facts.—The general surface of Chatham Island, except of that part 
posed of basaltic and doleritic rocks, and some lower hills near the sea- 
coast on the north side of the island. These hills are clothed with bush 
composed principally of basalts and tufas, and presenting, from Jenny 
Reef round to Cape Fournier, abrupt escarpments to the sea. The soil 
d 
3 & A : 
the surface, which, when sufficiently undermined, caves In, and 3s con- 
gtowth evidently far exceeding any that are now to be found on the 
islands. I was, I am sorry to say, unable to obtain any specimens, in 
ash e surface-growth (exclusive of bush) consists ] rincipally 
d sedges, with patches of fern; but I have little doubt that 
‘Partly by the constant firing of the surface by the natives, and partly by 
. Nearly the whole 
country had, in fact, been burnt shortly before my arrival. | 
“3 Notice of some new Types of Organic Remains from the Coal Meas- 
: nd A. H. N. 
ceedings of the Acad. Nat. Sci. Philad., March, 1865.—The fossils 
described are from Morris, Grundy Co., Illinois, the same with that of the 
insects ‘bed by Mr. Dana in volume xxxvi of this Journal. 
ae 
