OF CORNWALL. 35 
that they, are mofi kindly diftributed into every corner almoft of the 
world. But it muft not be imagined that they can do no hurt : 
like all other medicines, they have their ill tendencies, when im- 
properly applied, or ufed to excefs ; and therefore the time of tiling 
them, the neceflary correctives in particular cafes, as well as the 
quantity and time of omitting them, are furely belt learned from a 
phyfician. 
There are many other Wells of this kind in Cornwall f ; Iron, 
being more eafily diffolved and imbibed by running Water than 
any other mineral, which is the rcafon that there are more Chaly- 
beate, than Salt, Sulphurous, or Aluminous Springs ; but the 
delcription of more than one, as the effects of all are fo very like, 
would be needlefs, unlefs there was fome remarkable cure, and 
peculiar property afcribed, neither of which has in any of them as 
yet reached my notice. 
Many Naturalifts have endeavoured to give us the analyfis of thofe 
Waters: In all, the ingredients difcovered are much the fame (falts 
only excepted ) ; and it is the different quantity of particular ingre- 
dients, and the proportion they bear to the Water, which is their 
vehicle, that makes them ftronger or weaker. Our Spas in Eng- 
land are not fo fpirituous and pungent as the celebrated ones of 
Germany ; yet, in many cafes, they may be of great and extenfivc 
ule ; and, if I am well informed, the Spas of our own country may 
in moll cafes fupply the place of the other, though more famous 
foreign waters. 
As to faline, aluminous, hot, bitter, or fulphurous Waters, 
which deferve ftriCtly to be fo called, I have not been able to learn 
that there are any fuch in this County. 
I have feen a letter from the late Mr. Vallack (an apothecary of 
character in the town of Plymouth, and among thofe of his bufinefs 
noted for his fkill in chemiftry), in which he affirms, that Carn- 
Kei Water, near Redruth, is impregnated with tin. His words are 
thefe, in a letter, dated January 5, 1741 - 2 : “ I have not only read 
in Mr. Boyle’s Hiftory of Mineral Waters, but have feen the Water 
at Keyrn-Key, near Redruth, which I found impregnated both 
with iron and tin. It is the only Water I ever read of, or met 
with fo mixed. This is very rare, but not improbable. I have 
had no opportunity of trying this Water myfelf, and therefore can 
neither confirm nor difprove what is faid ; but as tin is frequently 
found intimately connected with iron ore, I apprehend that the 
Scarlet Well, near Bodman, was once much many colours like that of a Rainbow. (Carew, 
frequented, and is faid to be much heavier than page 127.) At prefen t it is fcarce known where 
other Water, and will keep without alteration of this Well is to be found, 
cent or talle moft part of a year ; reprefenting 
