and of what Proportions of them to one another, the particular Colour to be consider’d does result.  But because to insist on the Proportions, the Manner and the Effects of such Mixtures would oblige me to consider a greater part of the Painters Art and Dyers Trade, than I am well acquainted with, I confin’d my self to make Trial of several ways to produce Green, by the composition of Blew and Yellow.  And shall in this place both Recapitulate most of the things I have Dispersedly deliver’d already concerning that Subject, and Recruit them.

And first, whereas Painters (as I noted above) are wont to make Green by tempering Blew and Yellow, both of them made into a soft Consistence, with either Water or Oyl, or some Liquor of Kin to one of those two, according as the Picture is to be Drawn with those they call water Colours, or those they term Oyl Colours, I found that by choosing fit Ingredients, and mixing them in the form of Dry Powders, I could do, what I could not if the Ingredients were temper’d up with a Liquor; But the Blew and Yellow Powders must not only be finely Ground, but such as that the Corpuscles of the one may not be too unequal to those of the other, lest by their Disproportionate Minuteness the Smaller cover and hide the Greater.  We us’d with good success a slight Mixture of the fine Powder of Bise, with that of Orpiment, or that of good Yellow Oker, I say a slight Mixture, because we found that an exquisite Mixture did not do so well, but by lightly mingling the two Pigments in several little Parcels, those of them in which the Proportion and Manner of Mixture was more Lucky, afforded us a good Green.

2.  We also learn’d in the Dye-houses, that Cloth being Dy’d Blew with Woad, is afterwards by the Yellow Decoction of Luteola or Woud-wax or Wood-wax Dy’d into a Green Colour.

3.  You may also remember what we above Related, where we intimated, that having in a Darkn’d Room taken two Bodies, a Blew and a Yellow, and cast the Light Reflected from the one upon the other, we likewise obtain’d a Green.

4.  And you may remember, that we observ’d a Green to be produc’d, when in the same Darkn’d Room we look’d at the Hole at which alone the Light enter’d, through the Green and Yellow parts of a sheet of Marbl’d Paper laid over one another.

5.  We found too, that the Beams of the Sun being trajected through two pieces of Glass, the one Blew and the other Yellow, laid over one another, did upon a sheet of White paper on which they were made to fall, exhibit a lovely Green.

6.  I hope also, that you have not already forgot, what was so lately deliver’d, concerning the composition of a Green, with a Blew and Yellow; of which most Authors would call the one a Real, and the other an Emphatical.

7.  And I presume, you may have yet fresh in your memory, what the fourteenth Experiment informs you, concerning the exhibiting of a Green, by the help of a Blew and Yellow, that were both of them Emphatical.