Take then what Quantity you please of Fair Water, and having Heated it, put
into it as much good Common Sublimate, as it is able to Dissolve, and (to
be sure of having it well glutted:) continue putting in the Sublimate, till
some of it lye Untouch'd in the bottom of the Liquor, Filter this Solution
through Cap-paper, to have it cleer and limpid, and into a spoonfull or two
thereof, (put into a clean glass vessel,) shake about four or five drops
(according as you took more or less of this Solution) of good limpid
Spirits of Urine, and immediately the whole mixture will appear White like
Milk, to which mixture if you presently add a convenient proportion of
Rectifi'd _Aqua Fortis_ (for the number of drops is hard to determine,
because of the Differing Strength of the liquor, but easily found by tryal)
the Whiteness will presently disappear, and the whole mixture become
Transparent, which you may, if you please, again reduce to a good degree of
Whiteness (though inferiour to the first) onely by a more copious affusion
of fresh Spirit of Urine. _N_. First, That it is not so necessary to employ
either _Aqua Fortis_ or Spirit of Urine about this Experiment, but that we
have made it with other liquors instead of these, of which perhaps more
elsewhere.
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