150 
ECONOMICAL MINERALOGY. 
It is a spring which issues from the earth in sufficient volume to turn a light grist mill. Such 
an immense laboratory of sulphuric acid is here conducted by nature, that all the water which 
supplies this perennial stream possesses acidity enough to give the common test with violets, 
and to coagulate milk. Besides the above, there are said to be several other sour springs in 
this vicinity.* 
I have particularly examined both the liquid acid, and the brownish vegetable matter sub¬ 
jected to its action. 
The liquid is transparent and colourless; and in the specimen upon which I operated, had 
a specific gravity of 1.11304 at 60° F. It reddens litmus powerfully, has an intensely sour 
taste, causes a dense precipitate when added to muriate of barytes, but is not affected by 
nitrate of silver. When ammonia is added to the liquid to saturation, a slight precipitate of a 
reddish colour is the result, and the clear solution is afterwards also slightly affected by oxa¬ 
late of ammonia. The oxide of iron and lime indicated by the two latter tests are, however, 
in very small proportion; as is evident from the fact, that when the liquid is evaporated, it 
leaves only a trifling residuum. It is a nearly pure, though dilute, sulphuric acid, and not a 
solution of acid salts, as has been supposed; for the bases are in too minute proportions to . 
warrant the latter opinion. 
The brownish matter, or acid earth, is principally vegetable matter, charred by the action 
of the acid; but it also contains some silica and alumina, with a minute quantity of lime and 
oxide of iron. When this matter is boiled in water, a solution is obtained which possesses 
all the properties of the liquid just described. When heated for some time in a crucible to 
redness, the acid and vegetable matter disappear, and there remain a little sulphuret of cal¬ 
cium formed by the decomposition of the acid and the lime, a trace of iron, together with the 
earthy matters above mentioned, I could not detect, either in the liquid or in the solution of 
the earth, any other salt than those which I have already enumerated; unless, indeed, there 
should be some sulphate of alumina present. 
The occurrence of sulphuric acid in nature, in any thing like the pure form which it here 
possesses, is of great interest; only a few localities, and these rather doubtful, being hitherto 
known. In most of these, too, the acid is quite dilute ; and the occurrence is, moreover, 
principally confined to volcanic districts.! An earth, somewhat similar to that found in Byron, 
is said to exist in great quantities at a village called Daulakie, in the south of Persia, between 
three and four days journey from Bushire on the Persian Gulf. The natives employ it as a 
substitute for lemons and limes, in making their sherbets, of which considerable quantities 
are drank, they being prohibited the use of wine. On analysis, the acid was found to be the 
sulphuric, and this was united to iron ; the solution in boiling water, when evaporated, yielding 
crystals which seemed to be the acid sulphate of that metal.| 
Acid springs or wells are also found in the town of Bergen, in this county. 
f See G air drier on Mineral and Thermal Springs. 
* Eaton. American Journal of Science, XV. 239. 
% Philosophical Magazine for 1824. 
