[ 2 79 ] 
4. Do the waters of Aix la Chapelle and Borfel 
contain an alcaline fait ? So do many of our cold 
waters above enumerated. 
5*. Is diver, borne in the pockets during a courfe 
of Aix la Chapelle waters, tarnifhed ? The like ef- 
fect hath been obferved in feveral of our cold wa- 
ters. 
6 . Do the waters of Aix la Chapelle yield flowers 
of fulphur ? and do fome of the fprings of Borfel pre- 
cipitate a magiflery of fulphur ? The like hath been 
obferved in fome of our cold waters above enume- 
rated. 
7. Are the baths of Aix la Chapelle of known 
efficacy in the cure of the itch, impetigo, vitiligo, and 
ulcers ? So are the cold waters above enumerated, as 
appears from the fignal fucceffes, which have attended 
their ufe, even in fome of the moft inveterate and 
rebellious diforders of this kind. 
Is there any rafhnefs then in concluding, that thefe 
our cold waters do alfo contain fulphur fubftantially 
diflolved in them, and differ from the hot ones of 
Aix la Chapelle and Borfel in nothing but heat, and 
the different proportions of impregnating minerals of 
the fame quality ? 
Hence appears the great ufefulnefs of examining 
mineral waters in concert ; for as various accidental 
circumilances give occalion to different 'appearances, 
the examination of a competent number and variety 
of them, helps to fupply the defeats in the hiftories 
of fome of them. And, if this were further profe- 
cuted, I doubt not but fulphur in fubflance might 
be obtained from feveral of them, as well as from 
Aix ; which is therefore recommended to phyficians 
and naturalifls. 
So 
