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îf
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cR? iV B' y ." t". r ; t
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Gi ' k i 1 i B '-■■■■ 1 kl
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and have obtained in the firft cafe à
fixed glafs, and in the fecond one,
which, in diftblving, yielded a common
liquor filicum. The glafs o f the
cruftated ftone is o f a more yellowiili
brown than that of the cryftallizations ;
and this difference is caufed by the
greater quantity o f irony particles.
2. Tlie porous cruftated ftone or
iinter, which is found in the moor
iurrounding the border o f the bafon,
is light, whitiiii, and here and there
fpotted with a ruft colour ; it is evidently
an incruftation upon mofs and
fimilar fubftances, that have decayed
by length of time, and left thofe cavities.
In regard to its compoiition,
it is o f a filiceous a nature as the preceding,
and alfo perfeéily iimilar in
refpecl to fire and diifolvents.
I have already mentioned the folu-
tion o f the flint in fal fodæ with the
blow-pipe ; and as I iliall hereafter have
frequent occaiion to refer to it, I will in
this place relate the whole procefs. The
late dirertor o f the mines (bergmajiare)
Mr. Gronftedt makes mention of this
fait in his Mineralogy, but it is very
feldom ; and he confiders it as lefs
proper for uiing with the blow-pipe,
becaufe it is too foon imbibed by the
coals. It certainly does not afford a
very good folution upon coals, and I
therefore made ufe o f a iilver fpoon
made on purpofe ; by which method I
have been able to make good ufe of the
fal fodae, which in his examinations o f
the different kinds o f earth in this
manner, is very ferviceable, and even
iiidifpenfably neceftary, as I ihall hereafter
prove more at large, in a little
differtation on the blow-pipe, and its
proper ufe.
1 have frequently inferted a fuppofi-
tion in my printed works, that though
the filiceous earth cannot be diffolved
in the ufual manner in water, yet it
might with the help o f a great degree o f
heat; and that this really happened at
the Geyier, is evidently proved by the
above defcribed cruftated ftone. The
hot water forms of itfelf the large iili-
ceous bafon from which it iifues
put o f the fubftance, that is in a
dhfolvcd
m