[ 28© ] 
So much may {office concerning fuch waters, 
wherein iulphur is the predominating ingredient; but 
there are others, wherein there are ftrong indications 
of its prefence in a fmaller proportion, and mixed 
v/ith other minerals; and indeed, perhaps, few waters 
are without an admixture of it ; for, beiide feveral 
plain -waters, efpecially luch as contain the native 
alcali, and the purging w r aters, fea-water, the brine- 
fprings, and the chalybeate waters, all which mani- 
feft a fetor by putrefadtion, and fome of them there- 
upon the like d.i (colourations of metals as die fulphu- 
reous waters, the chalybeate waters, in particular, 
manifeft a fulphureous admixture, by the cream, 
which they throw up to the furface, the various co- 
lours whereof, and its difcolouring metals, are marks 
of Iulphur. 
There are, moreover, feveral other waters, even 
fome of thofe, which otherwil'e make the neared ap- 
proach to pure element, having very little falts or 
earth, which I have mentioned in the beginning of 
this work, which alfo give ftrong fulpicions of fome 
degree of a fulphureous impregnation, by the purple 
and black fediments precipitated from them by fo- 
lution of diver ; which are eminently confirmed by 
a late examination of the celebrated Holy wells at 
Malvern, publifhed in the yoth volume of the Tranf- 
adtions, and there extolled for many cures; which, 
altho’ they do not yield quite a grain of folid contents 
from a pint upon evaporation, give three evidences of 
iulphur. 
i. The purple powder precipitated from them by 
folution of filver. 2 . In exhaling the water ilowly 
in a filver vellel, the bottom of the veil'd was tinged 
8 of 
