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have been found under the bafons of that well. And 
Dr. Peter Shaw affirms, that real brimftone, even 
found to be fo by proper trials, hath been feen float- 
ing in the water like feathers, and feparable by bare 
draining: and to all this agrees the obfervation I have 
frequently made on feveral of thefe cold waters, viz. 
certain light purple-coloured pellicles are frequently 
found floating in them, which, being dried, fparkle, 
flame, and flunk, on the red-hot iron. But, to con- 
clude, the oneration and effedts of feveral of thefe 
our cold waters, altogether fimilar to thole of ful- 
phur, abundantly confirm their impregnation with 
that mineral. 
Thus it appears, that fulphur is not confined to the 
hot baths of Aix la Chapelle, and a few more abroad, 
but is found alfo in the cold waters of both England 
and Ireland ; and as thefe have, of late years, been 
fubjedted to a minute examination, I fhall fubjoin a 
brief comparifon between the one and the other from 
experiment and obfervation : thus, 
1. Is the fmell of the waters of Aix la Chapelle 
like that of the walkings of a foul gun, or like that 
of the folution of fulphur in an alcaline lye ? So is 
that of our cold waters called fulphureous. 
2. Do Aix la Chapelle waters, taken from their 
fource, turn filver of a gold -colour, and blackifh; and 
with its folution, 2nd that of fugar of lead, exhibit 
a dark-coloured precipitation ? So do our waters 
called fulphureous. 
3. Does Aix la Chapelle water, on dropping di- 
flilled vinegar into it, exhibit a milkinefs, analogous 
to lac fulphur is ? So divers of the cold waters above- 
mentioned do alfo exhibit a white cloud with other 
acids. 
4. Do 
