For, when it were even
admitted that every solid body is crystallised, we thus know no more of
the geology of this earth, or understand as little of the general theory
of mineral concretion, as we did before;--we cannot, from that, say
whether it be by the operation of solution or of fusion which had
produced the perceived effect.
[Note 37: Journal de Physique; Avril 1753.]
M. de Carosi has wrote a treatise upon certain petrifactions[38]. In the
doctrine of this treatise there is something new or extraordinary. It
will therefore be proper to make some observations on it.
[Note 38: Sur la Generation du Silex et du Quartz en partie.
Observations faites en Pologne 1783, a Cracovie.]
The object of this treatise is to describe the generation of silex and
quartz, with their modifications or compositions, formed within mineral
bodies of a different substance. The natural history contained in this
little treatise is well described and sufficiently interesting. But It
is chiefly in order to examine the means which, according to the theory
of this treatise, are employed in petrifying bodies, that I consider it
in this place.
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