'd and discover'd, divers
changes that are produc'd in Bodies either by Nature only, or by Art;
either of them being able by changing the Texture of some Concretes I could
name, to qualifie them to Operate after a New manner upon the above
mention'd Syrrup, or Solution, or both. And by this means, to tell you that
upon the by, I have been able to discover, that there may be made Bodies,
which though they run _per Deliquium_, as readily as Salt of Tartar, belong
in other respects, not to the family of Alcaliz, much less to that of
Salfuginous, or that of Acid Salts. Perhaps too, I may know a way of making
a highly operative Saline Body that shall neither change the Colour of
Syrrup of Violets, nor Precipitate the Solution of Sublimate; And, I can
likewise if I please conceal by what Liquors I perform such changes of
Colour, as I have been mentioning to you, by quite altering the Texture of
some ordinary Chymical productions, the Exploration of which is the main
use of the fortieth Experiment, which I think teaches not a little, if it
teach us to discover the nature of those things (in reference to Salt) that
are obtain'd by the ordinary Chymical Analysis of mix'd Bodyes, though
perhaps there may be other Bodyes prepar'd by Chymistry which may have the
same Effects in the change of Colours; and yet be produc'd not from what
Chymists call the Resolution of Bodies, but from their Composition. But the
discoursing of things of this nature is more proper for another place. 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-