Bodies, if they be so Small that they cannot Singly or apart be discern'd
by the Eye, and if they be sufficiently Thick set by one another, may by
their confus'd beams appear to the Eye One White Body. And why it is not
possible, that the like may be done, when a Multitude of Bright and Little
Corpuscles being crowded together, are made to send together Vivid beams to
the Eye, though they Shine but as the Planets by a Borrow'd Light?


11. But to return to our Experiments. We may take notice, That the White of
an Egg, though in part Transparent, yet by its power of Reflecting some
Incident Rays of Light, is in some measure a Natural _Speculum_, being long
agitated with a Whisk or Spoon, loses its Transparency, and becomes very
White, by being turn'd into Froth, that is into an Aggregate of Numerous
small Bubbles, whose Convex Superficies fits them to Reflect the Light
every way Outwards. And 'tis worth Noting, that when Water, for instance,
is Agitated into Froth, if the Bubbles be Great and Few, the Whiteness will
be but Faint, because the number of _Specula_ within a Narrow compass is
but Small, and they are not Thick set enough to Reflect so Many Little
Images or Beams of the Lucid Body, as are requisite to produce a Vigorous
sensation of Whiteness: And partly least it should be said, that the
Whiteness of such Globulous Particles proceeds from the Air Included in the
Froth; (which to make good, it should be prov'd that the Air it self is
White) and partly to illustrate the better the Notion we have propos'd of
Whiteness, I shall add, that I purposely made this Experiment, I took a
quantity Fair water, & put to it in a clear Glass phial, a convenient
quantity of Oyl or Spirit of Turpentine, because that Liquor will not
incorporate with Water, and yet is almost as Clear and Colourless as it;
these being Gently Shaken together, the Agitation breaks the Oyl (which as
I said, is Indispos'd to Mix like Wine or Milk _per minima_ with the Water)
into a Multitude of Little Globes, which each of them Reflecting Outwards a