which is dissolv'd in Water or Wine, but Sack_ (he affirms) _is the best to
preserve the Colour from Starving, (as they call it) that is, from
Decaying, and make it hold fresh the longer. The third Colour (where of
none_ (says he) _that I can find have made mention but only_ Tragus_) is a
Purplish Colour, which is made of the Berries suffer'd to grow upon the
Bushes untill the middle or end of_ November, _that they are ready to drop
from the Trees._

And, I remember (_Pyrophilus_) that I try'd, with a success that pleas'd me
well enough, to make such a kind of Pigment, as Painters call Sap-green, by
a way not unlike that, deliver'd here by our Author, but I cannot now find
any thing relating to that matter among my loose Papers. And my Trials were
made so many years ago, that I dare not trust my Memory for Circumstances,
but will rather tell you, that in a noted Colour-shop, I brought them by
Questions to confess to me, that they made their Sap-green much after the
ways by our _Botanist_ here mention'd. And on this occasion I shall add an
Observation, which though it does not strictly belong to this place, may
well enough be mention'd here, namely, that I find by an account given us
by the Learned _Clusius_, of _Alaternus_, that ev'n the Grosser Parts of
the same Plant, are some of them one Colour, and some another; For speaking
of that Plant, he tells us, that the _Portugalls_ use the Bark to Dye their
Nets into a Red Colour, and with the Chips of the Wood, which are Whitish,
they Dye a Blackish Blew.

_EXPERIMENT XXX._

Among the Experiments that tend to shew that the change of Colours in
Bodies may proceed from the Vary'd Texture of their Parts, and the
consequent change of their Disposition to Reflect or Refract the Light,
that sort of Experiments must not be left unmention'd, which is afforded us