I will not
here tell you what I have try'd, that I may be able to deprive at pleasure
the Precipitate that one of the Sulphureous Liquors had made, by the
copious Affusion of the other: Because I found, though this Experiment is
too ticklish to let me give a full account of it in few words, I shall
therefore tell you, that it is not only for once, that the other
above-mention'd Experiment may be made, the same Numerical parcels of
Liquor being still imploy'd in it; for after I have Clarify'd the Orange
Colour'd Liquor, by the addition of as little of the Oyl of Viriol as will
suffice to perform the effect, I can again at pleasure re-produce the
Opacous Colour, by the dropping in of fresh Oyl of Tartar, and destroy it
again by the Re-affusion of more of the Acid _Menstruum_; and yet oftner if
I please, can I with these two contrariant Liquors recall and disperse the
Colour, though by reason of the addition of so much new Liquor, in
reference to the Mercurial particles, the Colour will at length appear more
dilute and faint.
_An improvement of the fortieth Experiment_.
And, _Pyrophilus_, to confirm yet further the Notions that led me to think
on the propos'd Experiment, I shall acquaint you with another, which when I
had conveniency I have sometimes added to it, and which has to the
Spectators appear'd little less Odd than the first; And though because the
Liquor, requisite to make the Trial succeed well, must be on purpose
prepar'd anew a while before, because it will not long retain its fitness
for this work, I do but seldome annex this Experiment to the other, yet I
shall tell you how I devis'd it, and how I make it.
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