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. Now, that I might avoid all the Objections of this kind, by exhibiting an Experiment that might by ocular proof convince those whom other reasons would not prevail with, I provided me a _Prismatical Glass_, made hollow, just in the form of a Wedge, such as is represented in the tenth _Figure_ of the sixth _Scheme_. The two _parallelogram_ sides ABCD, ABEF, which met at a point, were made of the clearest Looking-glass plates well ground and polish’d that I could get; these were joyn’d with hard cement to the _triangular_ sides, BCE, ADF, which were of Wood; the _Parallelogram_ base BCEF, likewise was of Wood joyn’d on to the rest with hard cement, and the whole _Prismatical_ Box was exactly stopt every where, but onely a little hole near the base was left, whereby the Vessel could be fill’d with any liquor, or emptied again at pleasure.