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That is the extreme Force of Fire: And the ultimate Effect of Fire on all Bodies is Vitrification.
Linnæus ſays, the Spar he calls Natro-ſpatoſum, ſcarce does efferveſce with Acids: And it may be added, that the Particles of that Spar are, ſcarcely at all rhombic: Spar and Cryſtal are mixt in thoſe Bodies; and they have mixt Qualities; but ſtill as there is ſome Spar, there is ſome Efferveſcence.
'Tis vain to give the Forms of Spar to Natrum; for we not only find no Natrum there, but different Spars have Forms of different Salts; and the great Patron of the Salt Syſtem allows, that fome of them affect the various angulated Figures of Alum, Sea-Salt, Vitriol, and the refſt. 'Tis true, they reſemble thoſe Forms; but they have not thoſe Forms exactly: Nor is either of theſe, or any other Salt whatever, to be found exiſting in any of them.
But whither will not the Wind of Theory blow even the ſteadieſt Judgments? The foremoſt of the Writers, who favour this Syſtem, becauſe there are in Spars certain Forms that do not, agree with thoſe of any known Salt, fancies for the Formation of theſe that there exiſt Salts, not otherwiſe known to us, but by this Operation. When Theory can reach this Heighth, it may do what it pleaſes: To create Cauſes, becauſe we ſee Effects that ſeem to us to require them, is to make all Things eaſy; and at the cheapeſt Rate.
If
