In order to see this, we are to consider that both those substances have
specific shapes in which they concrete from the third state; the
sparry structure of the one is well known; the spherical or mammelated
crystallization of the calcedony, is no less conspicuous; this last
is, in the present case, spherical figures, which are some of
them hemispheres, or even more. The figures which we have now in
contemplation are so distinctly different as cannot be mistaken; the
one is a rhombic figure bounded by planes; the other is a most perfect
spherical form; and both these are specific figures, belonging
respectively to the crystallization of those two substances.
The argument now to be employed for proving that those two bodies had
concreted from the fluid state of fusion, and not from any manner of
solution, is this: That, were the one of those bodies to be found
impressing the other with its specific figure, we must conclude that the
impressing body had concreted or crystallized while the impressed body
was in a soft or fluid state; and that, if they are both found mutually
impressing and impressed by each other, they must have both been in
the fluid and concreting state together.
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