Silk in reference to the Eye, may notwithstanding their
having each of them a Colour of its own, make one part of their Aggregate
appear far Darker than the other; For I have near Great Towns often taken
notice, that a Cart-load of Carrots pack'd up, appear'd of a much Darker
Colour when Look'd upon, where the Points of the Carrots were Obverted to
the Eye, than where the Sides of them were so.

7. Fourthly, In a Darkned Room, I purposely observ'd, that if the
Sun-beams, which came in at the Hole were receiv'd upon White or any other
Colour, and directed to a Convenient place of the Room, they would
Manifestly, though not all Equally, Encrease the Light of that Part;
whereas if we Substituted, either a piece of Black Cloth or Black Velvet,
it would so Dead the Incident Beams, that the place (newly mention'd)
whereto I Obverted the Black Body, would be Less Enlightned than it was
before, when it received its Light but from the Weak and Oblique
Reflections of the Floor and Walls of a pretty Large Room, through which
the Beams that came in at the Hole were Confusedly and Brokenly Dispers'd.

8. Fifthly, And to shew that the Beams that fall on Black Bodies, as they
do not Rebound Outwards to the Eye, so they are Reflected towards the Body
it self, as the Nature of those Erected Particles to which we have imputed
Blackness, requires, we will add an Experiment that will also confirm our
Doctrine touching Whiteness; Namely, that we took a Broad and Large Tile,
and having Whitened over one half of the Superficies of it, and Black'd the
other, we expos'd it to the Summer Sun; And having let it lye there a
convenient time (for the Difference is more Apparent, if it have not lain
there too long) we found, as we expected, that whilst the Whited part of
the Tile remained Cool enough, the Black'd part of the same Tile was grown
not only Sensible, but very Hot, (sometimes to a strong Degree.) And to
satisfie some of our Friends the more, we have sometimes left upon the
Surface of the Tile, besides the White and Black parts thereof, a part that
Retain'd the native Red of the Tile it self, and Exposing them to the Sun,
we observ'd this Last mention'd to have Contracted a Heat in comparison of
the White, but a Heat Inferiour to that of the Black, of which the Reason
seems to be, that the Superficial Particles of Black Bodies, being, as we
said, more Erected, than those of White or Red ones, the Corpuscles of
Light falling on their sides,