or Deep; and then, whereas it has been already said, that the Caeruleous Colour was by Acid Salts abolished, this Yellowish one surviv’d without any considerable Alteration, so that unless our Author’s Words be taken in a very Limited Sense, we must conclude, that either his Memory mis-inform’d him, or that his White Nephritick Wood, and the Sadder Colour’d one which we employ’d, were not altogether of the same Nature:  What he mentions of the Cup made of Lignum Nephriticum, we have not had Opportunity to try, not having been able to procure pieces of that Wood great enough, and otherwise fit to be turned into Cups; but as for what he says in the Title of his Experiment, that this Wood tinges the Water with all Sorts of Colours, that is much more than any of those pieces of Nephritick Wood that we have hitherto employ’d, was able to make good; The change of Colours discernable in a Vial full of Water, Impregnated by any of them, as it is directed towards a place more Lightsome or Obscure, being far from affording a Variety answerable to so promising a Title.  And as for what he tells us, that in the Dark the Infusion of our Wood will resume a Caeruleous Colour, I wish he had Inform’d us how he Try’d it.

But this brings into my mind, that having sometimes for Curiosity sake, brought a round Vial with a long Neck fill’d with the Tincture of Lignum Nephriticum into the Darken’d Room already often mention’d, and holding it sometimes in, sometimes near the Sun-beams that enter’d at the hole, and sometimes partly in them, and partly out of them, the Glass being held in several postures, and look’d upon from several Neighbouring parts of the Room, disclos’d a much greater Variety of Colours than in ordinary inlightn’d Rooms it is wont to do; exhibiting, besides the usual Colours, a Red in some parts, and a Green in others, besides Intermediate Colours produc’d by the differing Degrees, and odd mixtures of Light and Shade.

By all this You may see, Pyrophilus, the reasonableness of what we elsewhere had occasion to mention, when we have divers times told you, that it is usefull to have New Experiments try’d over again, though they were, at first, made by Knowing and Candid Men, such Reiterations of Experiments commonly exhibiting some New Phaenomena, detecting some Mistake or hinting some Truth, in reference to them, that was not formerly taken notice of.  And some of our friends have been pleas’d to think, that we have made no unusefull addition to this Experiment, by shewing a way, how in a moment our Liquor may be depriv’d of its Blewness, and restor’d to it again by the affusion of a very few drops of Liquors, which have neither of them any Colour at all of their own.  And that which deserves some particular wonder, is, that the Caeruleous Tincture of our Wood is subject by the former Method to be Destroy’d or Restor’d, the Yellowish or Reddish Tincture continuing what it was.  And that you may see, that Salts are of