well, if made with Oyl of Vitriol, as if made only by Refrigeration and
length of Time. From this 'twas easie to deduce this Experiment, that if
you put into one Glass some of the freshly Impregnated and Filtrated
Solution of Antimony, and into another some of the Orange-Colour'd Mixture,
(which I formerly shew'd you how to make with a Mercurial Solution and Oyl
of Tartar) a few drops of Oyl of Vitriol dropp'd into the last mention'd
Glass, would, as I told you before, turn the Deep Yellow mixture into a
Cleer Liquor; whereas a little of the same Oyl dropp'd out of the same Viol
into the other Glass would presently (but not without some ill sent) turn
the moderately cleer Solution into a Deep Yellow Substance, But this, as I
Said, succeeds not well, unless you employ a _Lixivium_ that has but newly
dissolv'd Antimony, and has not yet let it fall. But yet in Summer time, if
your _Lixivium_ have been duly Impregnated and well Filtred after it is
quite cold, it will for some dayes (perhaps much longer than I had occasion
to try) retain Antimony enough to exhibit, upon the Affusion of the
Corrosive Oyl, as much of a good Yellow Substance as is necessary to
satisfie the Beholders of the Possibility of the Experiment.

_Reflections upon the XL. Experiment Compared with the X. and XX._

The Knowledge of the Distinction of Salts which we have propos'd, whereby
they are discriminated into _Acid, Volatile,_ or _Salfuginous_ (if I may
for Distinction sake so call the Fugitive Salts of Animal Substances) and
_fix'd_ or _Alcalizate_, may possibly (by that little part which we have
already deliver'd, of what we could say of its Applicableness) appear of so
much Use in Natural Philosophy (especially in the Practick part of it) that
I doubt not but it will be no Unwelcome Corollary of the Preceding
Experiment, if by the help of it I teach you to distinguish, which of those
Salts is Predominant in Chymical Liquors, as well as whether any of them be
so or not. For though in our Notes upon the X. and XX. Experiments I have