[ 4 62 ] 
14. Three quarts, wine-meafure, being flowly 
evaporated in a filver veffel, left not any faeces, or 
powder that could be collected, but only tinged the 
bottom of the veffel of a pale yellow colour, as if it 
had been flightly gilded. 
i£. Some of this water having been fent up to 
the very learned and ingenious Dr. Hales (whofe ge- 
nius for experiments of this kind, and veracity in re- 
lating them, are above all encomium) was by him 
examined. The following is an extract of his letter 
to the rev. Mr. Clare of Madresfield, on this fubjedt. 
Teddington, near Hainpton-court, 0 &, 25, 1750. 
SIR , 
« £ T" Have examined the Malvern-water by evapo- 
<c Jj_ rating a pound averdupoize of it to a drynefs, 
<l in a Florence flalk, cut with a red hot iron ring to 
<£ a mouth of about three inches diameter, as I have 
t£ in the fame manner examined many other purg- 
££ ing, fteel, rain and common waters ; and find, as 
tc you told me, that it is a very pure water, with lefs 
££ than a grain of fediment, afh- coloured, which does 
<£ not liquefy by ftanding, as the fediment of mod 
$£ waters does; a fign, that it has no fait in it. But 
u it was very obfervable, that when it was almoft 
<£ evaporated to a drynefs, there arofe invrfible pun- 
tc gent vapours, which fmelt much like the vapour 
“ of burning brimftone; which was- obferv'd, not 
<£ only by myfelf, but by others, who came into my 
<£ parlour. This pungency was very firong, when 
t£ my nofe was near the fialk., which was fet in a 
“ pipkin furrounded with fand. We may reafonably 
“ conclude. 
