reach the Eye, especially in this, that White Bodies do not only
Copiously Reflect those Incident Corpuscles Outwards, but Reflect them
Briskly, and do not otherwise Alter them in the manner of their Motion. Nor
shall I now stay to Enquire, whether some of those other ways, (as a
Disposition to Alter the Velocity, the Rotation, or the Order and Manner of
Appulse so the Eye of the Reflected Corpuscles that Compos'd the Incident
Beams of Light) which we mention'd when we consider'd the Production of
Colours in General, may not in some Cases be Applicable to those of White
and Black Bodies: For I am yet so much a _Seeker_ in this Matter, and so
little Wedded to the Opinions I have propos'd, that what I am to add shall
be but the Beginning of a Collection of Experiments and Observation towards
the History of Whiteness and Blackness, without at present interposing my
Explications of them, that so, I may assist your Enquires without much
Fore-stalling or Biassing your Judgment.

* * * * *

EXPERIMENT
IN
CONSORT,
Touching
Whiteness & Blackness.

* * * * *

EXPERIMENT I.

Having promis'd in the 114, and 115. Pages of the foregoing Discourse of
Whiteness and Blackness, to shew, that those two Colours may by a change of
Texture in bodies, each of them apart Diaphanous and Colourless, be at
pleasure and in a trice as well Generated as Destroy'd, We shall begin with
Experiments that may acquit us of that promise.

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 mixtu