which the fix'd Salt of the Alcalizate Solution will concoagulate into a
Saline Substance differing from either of them, I shall add, that I have
taken pleasure to recover out of the slowly exhal'd Liquor, that pass'd
through the filtre, and left the foremention'd _Calx_ behind, a Body that
at least seem'd a Salt very pretty to look on, as being very White, and
consisting of an innumerable company of exceeding slender, and shining
Particles, which would in part easily melt at the flame of a Candle, and in
part flye away with some little noise. But of this substance, and its odd
Qualities more perhaps elsewhere; for now I shall only take notice to you,
that I have likewise with Urinous Salts, such as the Spirit of Sal
Armoniack, as well as with the Spirit of Urine it self, Nay, (if I much
mistake not) ev'n with Stale Urine undistil'd, easily Precipitated such a
White _Calx_ as I was formerly speaking of, out of a Limpid Solution of
Allom, so that there is need of Circumspection in judging of the Natures of
Liquors by Precipitations wherein Allom intervenes, else we may sometimes
mistakingly imagine that to be Precipitated out of a Liquor by Allom, which
is rather Precipitated out of Allom by the Liquor: And this puts me in mind
to tell you, that 'tis not unpleasant to behold how quickly the Solution of
Allom (or injected lumps of Allom) do's occasion the severing of the
colour'd parts of the Decoction from the Liquor that seem'd to have so
perfectly imbib'd them.

[25] _The Curious Reader that desires further Information concerning
Lakes, may Resort to the 7th Book of_ Neri's _Art of Glass, Englished (6
or 7 years since the Writing of this 49th Experiment) and Illustrated
with Learned Observations, by the Inquisitive and experienc'd Dr._
Charles Merret.

_Annot. II._