Mr, BELKNAP's Accoant of a fofil Subpance, 377. 
XVII. An Account of large Quantities of a foffl Subflance, 
containing Vitriol and Sulphur, found at Lebanon, im rhe 
State of New-Hampfhire, accompanying a Specimen. Ina 
Letter from the Reverend Jeremy BerkNaA», F. A. A, 
and Member of the Philofophical Society at Philadelphia, to 
SAMUEL WILLIAMS, L.L. D. F.A.A. and Hollis Pros 
- Llar of, Mathematics and. Philefophy in the Univerfity at 
Cambridge. - 
Dover, September 28, 1780. 
SIR, | 
ERE WITH I fend you a fpecimen of a ftone, which, 
by the efflorefcence upon it, you will fee to be rich in 
vitriol, and by the fmell, you will perceive to contain a 
proportion of fulphur. It was taken out of the cellar-wall of 
an houfe at Lebanon, in the county of York, where it had been 
placed for about fifteen years. The fame kind of ftone ís found 
in vaft quantities, for a confiderable diftance round the fpot. 
'The neighbouring people ufe it for dyes, and for blacking lea- 
ther, with as much fuccefs as the beft imported Copperas AS 
there is plenty of wood and water there, I think a 
might be eftablifhed to great advantage. You will judge hie 
ther this hint is worth communicating to your newly eftablith. 
ed Society. 
I am, Sir, ‘ , 
Your friend ET humble mea” 
JEREMY BELKNAP. 
“at 
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