C 4 5° 3 
there afeended Plenty of invifible volatile fait Fumes, 
1 q pungent that the Nofe could not bear them. 
Hence we may reafonably conclude, that the Waters 
which abound moft with purging Salts, fuch as thgfe 
of JeJfop’s Well , fhould be proportionably preferable 
to weaker Waters, which are ftrengthened by boiling- 
half away; whereby not only the more fubtil a&ive 
Parts are evaporated ; and thofe that are left are de- 
compounded, and formed into new grofler Combi- 
nations } as arc alfo the calcarious Particles, which 
arc lo fine as to pafs the Filter before Evaporation, 
but not after it. This was the Reafon which in- 
duced me to examine, by various repeated Trials, 
and to give an Account of the fuperior Strength of 
Jejfop’ s Well Water, above all others that I have 
examined or heard of. 
When JfJptp’? Well was cleaned, 061 . 16, 1749. 
after a conliderable Quantity of Rain, after about 
half a Foot Depth of black muddy Filth was taken 
out, then the natural fat fandy-colour'd Clay-Bottom 
appear’d ; thro’ fcveral Parts of which the Water 
ouzed up at the Rate ot 160 Gallons in 24 Hours. 
The Water which then came frefh from the Spring 
gave a weak Blufh with Galls; but when put into 
Bottles it did not do fo next Day ; a Sign that there 
is fome Degree of Steel in it. 
It was very obfervable, that the Man who flood 
about three Hours bare-legg’d in this Well-Water 
to clean it, was purged fo fevcrely for a Week, 
that he faid he would not venture, on any account, 
thus to clean the Well again. And it was the fame 
with another Man, who cleaned the fame Well about 
twelve Years fince. And I am credibly informed 
by 
