Lucid Image, make the Imperfect Mixture of the two Liquors appear Whitish;
but if by Vehemently Shaking the Glass for a competent time you make a
further Comminution of the Oyl into far more Numerous and Smaller
_Globuli_, and thereby confound it also better with the Water, the Mixture
will appear of a Much greater Whiteness, and almost like Milk; whereas if
the Glass be a while let alone, the Colour will by degrees Impair, as the
Oyly globes grow Fewer and Bigger, and at length will quite Vanish, leaving
both the Liquors Distinct and Diaphanous as before. And such a Tryal hath
not ill succeeded, when insteed of the Colourless Oyl of Turpentine I took
a Yellow Mixture made of a good Proportion of Crude Turpentine dissolv'd in
that Liquor; and (if I mis-remember not) it also Succeeded better than one
would expect, when I employ'd an Oyl brought by Filings of Copper infused
in it, to a deep Green. And this (by the way) may be the Reason, why often
times when the Oyls of some Spices and of Anniseeds &c. are Distilled in a
Limbec with Water, the Water (as I have several times observ'd) comes over
Whitish, and will perhaps continue so for a good while, because if the Fire
be made too Strong, the subtile Chymical Oyl is thereby much Agitated and
Broken, and Blended with the Water in such Numerous and Minute Globules, as
cannot easily in a short time Emerge to the Top of the Water, and whilst
they Remain in it, make it, for the Reason newly intimated, look Whitish;
and perhaps upon the same Ground a cause may be rendred, why Hot water is
observ'd to be usually more Opacous and Whitish, than the same Water Cold,
the Agitation turning the more Spirituous or otherwise Conveniently
Dispos'd Particles of the Water into Vapours, thereby Producing in the Body
of the Liquor a Multitude of Small Bubbles, which interrupt the Free
passage, that the Beams of Light would else have Every way, and from the
Innermost parts of the Water Reflect many of them Outwards. These and the
like Examples, _Pyrophilus_, have induc'd me to Suspect, that the
Superficial Particles of White bodies, may for the Most part be as well
Convex as Smooth; I content my self to say _Suspect_ and _for the most