_
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
shown you a way by means of the Tincture of _Lignum Nephriticum_, or of
Syrrup of Violets, to discover whether a propounded Salt be Acid or not,
yet you can thereby only find in general that such and such Salts belong
not to the Tribe of Acids, but cannot determine whether they belong to the
Tribe of Urinous Salts (under which for distinction sake I comprehend all
those Volatile Salts of Animal or other Substances that are contrary to
Acids) or to that of Alcalies.
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