little Experimental Knowledge in Chymical Matters, that by their frequent Mistakes and unskilfull Way of Oppugning, they have too often expos'd Themselves to the Derision of their Adversaries, for writing so Confidently against what they appear so little to understand._ _And Lastly_, Carneades _hopes, he shall doe the Ingenious this Piece of service, that by having Thus drawn the Chymists Doctrine out of their Dark and Smoakie Laboratories, and both brought it into the open light, and shewn the weakness of their Proofs, that have hitherto been wont to be brought for it, either Judicious Men shall henceforth be allowed calmly and after due information to disbelieve it, or those abler Chymists, that are zealous for the reputation of it, will be oblig'd to speak plainer then hitherto has been done, and maintain it by better Experiments and Arguments then Those_ Carneades _hath examin'd: so That he hopes, the Curious will one Way or other Derive either satisfaction or instruction from his endeavours. And as he is ready to make good the profession he makes in the close of his Discourse, he being ready to be better inform'd, so he expects either to be indeed inform'd, or to be let alone. For Though if any Truly knowing Chymists shall Think fit in a civil and rational way to shew him any truth touching the matter in Dispute That he yet discernes not,_ Carneades _will not refuse either to admit, or to own a Conviction: yet if any impertinent Person shall, either to get Himself a Name, or for what other end soever, wilfully or carelesly mistake the State of the Controversie, or the sence of his Arguments, or shall rail instead of arguing, as hath been done of Late in Print by divers Chymists;_[1] _or lastly, shall write against them in a canting way; I mean, shall express himself in ambiguous or obscure termes, or argue from experiments not intelligibly enough Deliver'd_, Carneades _professes, That he values his time so much, as not to think the answering such Trifles worth the loss of it._ [Footnote 1: G. and F. and H. and others, in their books against one another.] _And now having said thus much for_ Carneades, _I hope the Reader will give me leave to say something too for my self._