PHYSICAL ann LITERARY. 359 
which has been difcovered to contain fuch a 
falt. 
In the Philofophical Tranfactions, N° 245. 
mention is made of two mineral waters, 
which yielded a real fixed vitriol of iron, one 
near Eglingham in Northumberland, the other 
near Haigh in Lancafmre; but thefe waters 
were found by Dr Czy, who made gparticu- 
lar inquiry into the matter, not to be mine- 
ral fprings, but drifts made for the draining 
of coal-pits; and that the vitriol found in 
thefe waters, was owing to their running o- 
ver marcafite beds which had been expofed 
for fome time to the air. I was fufpicious 
that fomething of this kind had communica- 
ted the vitriol to the Hartfell Spaw; but Mr 
Williamjon; who difcovered the fpring, affured' 
me, that the water, on which I mace the pre- 
ceeding experiments, had run over nothing at 
all, after its exit from the fpring, but was ta- 
ken up by himfelf immediately, as it iffued 
out of the rock. Dr ames Hunter, Phy- 
fician in Moffat, afterwards fent me fome 
of the fame water, which he recejved into 
bottles, by applying their mouth to the ori- 
fice of the vein, in the rock from which it if- 
fued; and from it I obtained cryftals of vitri- 
olum 
