the Sulphur Wells at Harrogate, 1 8 j 
both the black fediment, and the white fcum, gave clear Indi- 
cations, on a hot iron, of their containing fulphur : I know 
not whence it has come that his accuracy has been queftioned 
in this point; certain I am, that on the repetition of his expe- 
riments I found them true. The white fcum alfo, which is 
found flicking on the grafs over which the water flows, being 
gently dried, burns with the flame and fmell of fulphur*. 
From what has been faid it is clear, that fulphur is found at 
Harrogate, flicking to the bafon into which the water fprings ; 
fublimed upon the ftones which compofe the edifice furround- 
ing the well; adhering to the fides of the tubs in which the 
water ftands ; fubfiding to the bottom of the channel in which 
the water runs; and covering the furface of the earth, and 
of the blades of grafs, over which it flows. It is unneceffary to 
add another word on this fubjedl ; it remains that I ri(k a con- 
jecture or two, on the primary caufe of the fulphureous im- 
pregnation obfervable in thefe waters. 
In the Chemical Effay before referred to, I have fhewn, 
that the air feparable from the lead ore of Derbyfhire, or from 
Black-Jack, by folution in the acid of vitriol, impregnates com- 
mon water with the fulphureous fmell of Harrogate water; 
and I have alfo (hewn that the bladder focus or fea-wraek, by 
being calcined to a certain point, and put into water, not only 
gives the water a brackifh tafte, but communicates to it, with- 
out injuring its transparency, the fmell, tafte, and other pro- 
perties of Harrogate water, Profeffor Bergman impregnated 
water with a fulphureous tafte and fmell, by means of air fepa- 
rated by the vitriolic acid from hepar fulphuris, made by fufioo 
©f equal weights of fulphur and pot-afhes, and from a mafs 
made of three parts of iron filings melted with two of ful- 
phur ; and he found alfo, that Black-Jack and native Siberian 
l 
iron. 
