(under which I comprehend the Urinous
and Volatile Salts of Animal Substances, and the Alcalisate or fixed Salts
that are made by Incineration) have the vertue of Restoring it.

_A Corollary of the Tenth Experiment._

That this Experiment, _Pyrophilus_, may be as well Usefull as Delightfull
to You, I must mind You, _Pyrophilus_, that in the newly mention'd
Observation, I have hinted to You a New and Easie way of Discovering in
many Liquors (for I dare not say in all) whether it be an Acid or
Sulphureous Salt, that is Predominant; and that such a Discovery is
oftentimes of great Difficulty, and may frequently be of great Use, he that
is not a Stranger to the various Properties and Effects of Salts, and of
how great moment it is to be able to distinguish their Tribes, may readily
conceive. But to proceed to the way of trying other Liquors by an Infusion
of our Wood, take it briefly thus. Suppose I have a mind to try whether I
conjecture aright, when I imagine that Allom, though it be plainly a Mixt
Body, does abound rather with Acid than Sulphureous Salt. To satisfie my
self herein, I turn my back to the Light, and holding a small Vial full of
the Tincture of _Lignum Nephriticum_, which look'd upon in that Position,
appears Caeruleous, I drop into it a little of a strong Solution of Allom
made in Fair Water, and finding upon the Affusion and shaking of this New
liquor, that the Blewness formerly conspicuous in our Tincture does
presently vanish, I am thereby incited to suppose, that the Salt
Praedominant in Allom belongs to the Family of Sour Salts; but if on the
other side I have a mind to examine whether or no I rightly conceive that
Salt of Urine, or of Harts-horn is rather of a Saline Sulphureous (if I may
so speak) than of an Acid Nature, I drop a little of the Saline Spirit of
either into the Nephritick Tincture, and finding that the Caeruleous Colour
is rather thereby Deepned than Destroy'd, I collect that the Salts, which
constitute these Spirits, are rather Sulphureous than Acid. And to satisfie
my self yet farther in this particular, I take a small Vial of fresh
Tincture, and placing both it and my self in reference to the Light as
formerly, I drop into the Infusion just as much Distill'd Vinegar, or other
Acid liquor as will serve to Deprive it of its Blewness (which a few drops,
if the Sour Liquor be strong, and the Vial small will suffice to do) then
without changing my Posture, I drop and shake into the same