( 5 5 > ) 
VI. Since our Experiments difcover, that thofe Things 
which are of a fweetning Alkjilifate Nature, do fo very 
well agree with thefe Mineral Waters, it will appear by 
the following Experiment that Acids do very much 
difagree. 
1. I put but one drop of Oil of Vitriol to a large 
Glafs full of ftrong Spa-Waters , which before the addi- 
tion of this Acid did give a deep purple to the Solu- 
tion of Galls; but now would not give the leaft Tin- 
cture, tho’ I put in four times as much of the Galls. 
From hence I conclude, that the Virtues of the Chaly- 
beat Ingredienrs, which I take to be the Life and Soul 
of thefe Waters, were fo far bound up or deftroy’d as 
to have loft their Cordial or corroborating Faculty ^and 
that the Bile or Gall in the Humane Bowels could not 
be able to feparate the Chalybeat (''which are the only 
Medical) Particles, and mix them with the Chyle, in 
order to anfwer any End in Phyfick. 
Let this be a caution to thole that defign to make thefe 
Waters pafs better by Urine, that they do not make 
ufe of any Acids 5 it being a common Pra&ice co ufe 
Spirit of Vitriol, Spiritus Nitri dulcis , &c. as a Diuretick : 
XIolefs it fhould fo happen that they have a de- 
fign to take off, and diveft them of their warm cordial 
or altering Power, and fo to bring them near to com- 
mon Water 5 which I muft confefs we are forc’d to do, 
efpecially in the ufe of Bath Waters, in fome hot Inflam- 
matory Cafes. 
2. I Ihall conclude with one fhort Experiment in 
favour of our Alkalis $ That if you put any Alkali Salt, 
volatile cr fix’d, fuch as Volatile Salt of Hartfhorn, or 
of Sal Armon'mc , or fix’d Salt of Tartar, of Wormwood, 
or any other true Alkali, you will then deftroy the a- 
bove-nam’d Acid Spirit, recover the virtue of the Wa- 
ters, and difpofe them to give their- Tin&ure as they 
ufed to do in their Natural State. 
K k 2 
XXVII. Part 
