408 : Miscellanies. 
ed by receiving samples of the more remarkable ones, carefully cork- 
ed and sealed on the spot, and in quantity not less than a pint. ‘They 
may be addressed to the Chemical Laboratory, Broad-street, Oxford, 
for, _ Sir, your obedient humble servant. 7 
HARLES DavuBeny, 
Professor of Chemistry, Oxford. 
10. Diluvial Furrows and Scratches. 
Extract ofa letter from David Tho omas, Esq. one of the chief Engineers of the Erie 
Canal to Professor J. Griscom, dated Greatfield, 9 mo, 0, 1829 
In a late number of the Journal of Science, there is a notice of in- 
formation laid before the New York Lyceum, relative to the worn 
appearance of rocks in situ, with parallel scratches, (such as heavy 
harrows might make in soft slate,) and the writer speaks of them as 
being in a southeasterly direction. 
Appearances precisely similar, occurred in excavating the Erie 
Canal above Lockport, on hard limestone, with a direction of the 
lines about north 25° east. 
“Similar marks were found on uncovering hard sandstone in the 
Erie Canal not far from Brockport, and nearly eighty feet below the 
former level. At my request, Dr. Whippo, oe cer engineer, 
ascertained the direction of the lines north 80° 
N early on. the same level with the last, on ea east side of the Gen- 
esee river, and also on the line of the Erie Canal, similar scratches 
occurred on the hard limestone, but I know not the direction. 
I have also found similar traces on the Montrose and Milford turn- 
pike, south of the Great Bend of the Susquehanna, in Pennsylva- 
nia, probably 1000 feet above any of the before mentioned localities, 
and in all cases on hard rock tn situ. 
I see no difficulty in referring this attrition of the surface of rocky 
strata, to the Deluge,—a period when all the loose matter of the 
globe appears to have been in violent commotion; but on the cause 
of lines so regular and so, deeply engraved, I have bothing to offer. 
11. Economical Process for Chlorate of Potash, by 4. A. Hays-— 
Add to a quantity of chloride of lime, or bleaching powder, four times 
its weight of rain water, and agitate it occasionally ; after two hours, 
decant the clear liquor, and repeat the operation twice on the undis- 
=. _ Solved perl using one half the quantity of water; mix and measure 
ms. Prepare a solution of pearlash, rs adding six parts of 
7 decanting the clear liquor, and washing the residue with 
