I want proper Words to
express them in our Language, and had not when we made the Tryals, the
Opportunity of consulting with a Painter, who perchance might have Suppli'd
me with some of the terms I wanted.

I know not whether it will be requisite to subjoyn on this Occasion, what I
tried concerning Reflections from Colour'd Glasses, and other Transparent
Bodies, namely, that having expos'd four or five sorts of them to the Sun,
and cast the Reflected Beams upon White Paper held near at hand, the Light
appear'd not manifestly Ting'd, but as if it had been Reflected from the
Impervious parts of a Colourless Glass, only that Reflected from the Yellow
was here and there stain'd with the same Colour, as if those Beams were not
all Reflected from the Superficial, but some from the Internal parts of the
Glass; upon which Occasion you may take notice, that a Skilfull Tradesman,
who makes such Colour'd Glass told me, that where as the Red Pigment was
but Superficial, the Yellow penetrated to the very midst of the Plate. But
for further Satisfaction, not having the Opportunity to Foliate those
Plates, and so turn them into Looking-glasses, we Foliated a Plate of
_Muscovy_ Glass, and then laying on it a little Transparent Varnish of a
Gold Colour, we expos'd it to the Sun-beams, so as to cast them upon a Body
fit to receive them, on which the Reflected Light, appearing, as we
expected, Yellow, manifested that Rebounding from the Specular part of the
_Selenitis_, it was Ting'd in its return with the Colour of the Transparent
Varnish through which it pass'd.

_EXPERIMENT XIV._

After what we have said of the Composition of Colours, it will now be
seasonable to annex some Experiments that we made in favour of those
Colours, that are taught in the Schools not to be Real, but only Apparent
and Phantastical; For we found by Tryals, that these Colours might be
Compounded, both with True and Stable Colours, and with one another, as
well as unquestionably Genuine and Lasting Colours, and that the Colours
resulting from such Compositions, would respectively deserve the same
Denominations.

For first, having by the Trajection of the Sun-beams through a Glass-prism
thrown an Iris on the Floor, I found that by placing a Blew Glass at a
convenient distance betwixt the Prism and the Iris, that part of the Iris
that was before Yellow, might be made to appear Green, though not of a
Grass Green, but of one more Dilute and Yellowish. And it seems