mention’d shews in his 40.  Experiment) precipitates with oyl of Tartar per deliquium, into an Orange colour’d precipitate; nor is it less probable, that the calcination of those Vitriols by the fire, should have their particles transparent:  Thus Saccarum Saturni, or the Vitriol of Lead by calcination becomes a deep Orange-colour’d minium, which is a kind of precipitation by some Salt which proceeds from the fire; common Vitriol calcin’d, yields a deep Brown Red, etc.

A third Argument, that the particles of Metals are transparent, is, that being calcin’d, and melted with Glass, they tinge the Glass with transparent colours.  Thus the Calx of Silver tinges the Glass on which it is anneal’d with a lovely Yellow, or Gold colour, &c.

And that the parts of Metals are transparent, may be farther argued from the transparency of Leaf-gold, which held against the light, both to the naked eye, and the Microscope, exhibits a deep Green.  And though I have never seen the other Metals laminated so thin, that I was able to perceive them transparent, yet, for Copper and Brass, if we had the same conveniency for laminating them, as we have for Gold, we might, perhaps, through such plates or leaves, find very differing degrees of Blue, or Green; for it seems very probable, that those Rays that rebound from them ting’d, with a deep Yellow, or pale Red, as from Copper, or with a pale Yellow, as from Brass, have past through them; for I cannot conceive how by reflection alone those Rays can receive a tincture, taking any Hypothesis extant.

So that we see there may a sufficient reason be drawn from these instances, why those colours which we are unable to dilute to the palest Yellow, or Blue, or Green, are not therefore to be concluded not to be a deeper degree of them; for supposing we had a great company of small Globular essence Bottles, or round Glass bubbles, about the bigness of a Walnut, fill’d each of them with a very deep mixture of Saffron, and that every one of them did appear of a deep Scarlet colour, and all of them together did exhibit at a distance, a deep dy’d Scarlet body.  It does not follow, because after we have come nearer to this congeries, or mass, and divided it into its parts, and examining each of its parts severally or apart, we find them to have much the same colour with the whole mats; it does not, I say, therefore follow, that if we could break those Globules smaller, or any other ways come to see a smaller or thinner parcel of the ting’d liquor that fill’d those bubbles, that that ting’d liquor must always appear Red, or of a Scarlet hue, since if Experiment be made, the quite contrary will ensue; for it is capable of being diluted into the palest Yellow.