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A greater Disparity betwixt Emphatical Colours, and others, may perhaps be taken from this, that Genuine Colours seem to be produc'd in Opacous Bodies by Reflection, but Apparent ones in Diaphanous Bodies, and principally by Refraction, I say Principally rather than Solely, because in some cases Reflection also may concurr, but still this seems not to conclude these Latter Colours not to be True ones.
And next, though the Beams of Light are such subtil Bodies, that in respect of them, even Surfaces that are sensibly Smooth, are not exactly so, but have their own degree of Roughness, consisting of little Protuberances and Depressions; and though consequently such Inequalities may suffice to give Bodies differing Colours, as we see in Marble that appears White or Black, or Red or Blew, even when the most carefully Polish'd, yet 'tis plain by the late Instance of Red Marble, and many others, that even bigger Protuberances and greater Shades may likewise so Diversifie the Roughness of a Bodies Superficies, as manifestly to concurr to the varying of its Colour, whereby such Examples appear to be proper enough to be employ'd in such a Subject as we have now in hand.
II. These, Pyrophilus, are the chief things that Occurr to me at present, about the Nature of Whiteness and Blackness, which it they have Rendred it so much as Probable, that in Most; or at least Many Cases, the Causes of these Qualities may be such as I have Adventur'd to Deliver, it is as much as I Pretend to; for till I have Opportunity to Examine the Matter by some further Tryals, I am not sure, but that in some White and Black Bodies, there may Concurr to the Colour some peculiar Texture or Disposition of the Body, whereby the Motion of the Small Corpuscles that make up the Incident Beams of Light, may be Differingly Modify'd, before they reach the Eye, especially in this, that White Bodies do not only Copiously Reflect those Incident Corpuscles Outwards, but Reflect them Briskly, and do not otherwise Alter them in the manner of their Motion.
There are you know, Pyrophilus, besides those Obsolete Opinions about Colours which have been long since Rejected, very Various Theories that have each of them, even at this day, Eminent Men for its Abetters; for the Peripatetick Schools, though they dispute amongst themselves divers particulars concerning Colours, yet in this they seem Unanimously enough to Agree, that Colours are Inherent and Real Qualities, which the Light doth but Disclose, and not concurr to Produce.
We here testify and protest against the prompters to, promoters or establishers of, and against every thing that hath tended to the promoting, advancing, corroborating, or by law establishing such a wicked and ruining Union; and hereby we also declare against the validity of the proceedings of the late Parliament with reference to the carrying on, and establishing the said Union; and that their acts shall not be look't upon as obligatory to us, nor ought to be by posterity, nor any way prejudicial to the cause of God, and the covenanted work of reformation in this Church, nor to the beeing, liberty, and freedom of Parliaments, according to the laudable and antient pratique of this kingdom, the which we do not only for ourselves, but also in the name of all such as shall join or concurr with us in this our protestation, and therefore we Protest.
Likeas the Lord was so pleased to bless our land, and to beautify it with His presence, that our neighbour nations of England and Ireland, who beheld this, and were groaning under and likeways aiming at the removal and abolishing of popery and prelacy, had sought and obtained assistance from this nation to help them in their endeavours for that end, and had been owned of God with success, they likeways thought it fit to enter into a most Solemn League and Covenant with this Church and kingdom for reformation and defence of religion, wherein, with their hands lifted up to the most High God, they do bind and oblige themselves to maintain, preserve and defend, whatever measure and degree of reformation they had attained unto, and mutually to concurr, each with another with their lives and fortunes in their several places and callings, in opposition to all the enemies of the same, as may be seen at large in the Solemn League and Covenant.
And on this Occasion we may as well in Reference to something formerly deliver'd concerning Whiteness, as in Reference to what has been newly said, Subjoyn what we further observ'd touching the Differing Reflections of Light from White and Black Marble, namely, that having taking a pretty Large Mortar of White Marble, New and Polish'd in the Inside, and Expos'd it to the Sun, we found that it Reflected a great deal of Glaring Light, but so Dispers'd, that we could not make the Reflected Beams concurr in any such Conspicuous Focus, as that newly taken notice of in the Black Marble, though perhaps there may enough of them be made to meet near the Bottom, to make some Kind of Focus, especially since by holding in the Night-time a Candle at a convenient Distance, we were able to procure a Concourse of some, though not many of the Reflected Beams, at about two Inches distant from the Bottom of the Mortar: But we found the Heat even of the Sunbeams so Dispersedly Reflected to be very Languid, even in Comparison of the Black Marbles Focus.
But besides this difference of Shape, there may be divers other things that may eminently concurr to vary the forms of Asperity that Colours so much depend on. See the Discourse of the Nature of Whiteness and Blackness.
Nay, that Black Mineral Antimony it self, being reduc'd by and with the Salts that concurr to the Composition of common Sublimate, into that Cleer though Unctuous Liquor that Chymists commonly call Rectifi'd Butter of Antimony, will by the bare affusion of store of Fair Water be struck down into that Snow-white Powder, which when the adhering Saltness is well wash'd off, Chymists are pleas'd to call Mercurius Vitæ, though the like Powder may be made of Antimony, without the addition of any Mercury at all.
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