I
shall now onely add, what might perhaps have been more seasonably told you
before; That the Reason why the way of Exploration of Salts hitherto
deliver'd, succeeds in the Solution of Sublimate, depends upon the
particular Texture of that Solution, as well as upon the differing Natures
of the Saline Liquors imploy'd to Precipitate it. For Gold dissolv'd in
_Aqua Regia_, whether you Precipitate it with Oyl of Tartar which is an
Alcaly, or with Spirit of Urine, or Sal Armoniack which belongs to the
family of Volatile Salts, will either way afford a Yellow substance: though
with such an Acid Liquor, as, I say not Spirit of Salt, the Body that
yields it, being upon the matter an Ingredient of _Aqua Regis_, but Oyl of
Vitriol it self, I did not find that I could Precipitate the Metall out of
the Solution, or destroy the Colour of it, though the same Oyl of Vitriol
would readily Precipitate Silver dissolv'd in _Aqua-fortis_. And if you
dissolve pure Silver in _Aqua-fortis_, and suffer it to shoot into
Crystals, the cleer Solution of these made in fair Water, will afford a
very White Precipitate, whether it be made with an Alcaly, or an Acid
Spirit, as that of Salt, whereas, which may seem somewhat strange, with
Spirit of Sal Armoniack (that I us'd was made of Quicklime) I could obtain
no such White Precipitate; that Volatile Spirit, nor (as I remember) that
of Urine, scarce doing any more than striking down a very small quantity of
Matter, which was neither White nor Whitish, so that the remaining Liquor
being suffer'd to evaporate till the superfluous Moisture was gone, the
greatest part of the Metalline Corpuscles with the Saline ones that had
imbib'd them, concoagulated into Salt, as is usual in such Solutions,
wherein the Metall has not been Precipitated.
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