_And first, if some morose Readers shall find fault with my having made the Interlocutors upon occasion complement with one another, and that I have almost all along written these Dialogues in a stile more Fashionable then That of meer scholars is wont to be, I hope I shall be excus'd by them that shall consider, that to keep a due_ decorum _in the Discourses, it was fit that in a book written by a Gentleman, and wherein only Gentlemen are introduc'd as speakers, the Language should be more smooth, and the Expressions more civil than is usual in the more Scholastick way of writing. And indeed, I am not sorry to have this Opportunity of giving an example how to manage even Disputes with Civility; whence perhaps some Readers will be assisted to discern a Difference betwixt Bluntness of speech and Strength of reason, and find that a man may be a Champion for Truth, without being an Enemy to Civility; and may confute an Opinion without railing at Them that hold it; To whom he that desires to convince and not to provoke them, must make some amends by his Civility to their Persons, for his severity to their mistakes; and must say as little else as he can, to displease them, when he says that they are in an error._ _But perhaps other Readers will be less apt to find fault with the Civility of my Disputants, than the Chymists will be, upon the reading of some Passages of the following Dialogue, to accuse_ Carneades _of Asperity. But if I have made my Sceptick sometimes speak sleightingly of the Opinions he opposes, I hope it will not be found that I have done any more, than became the Part he was to act of an Opponent: Especially, if what I have made him say be compar'd with what the Prince of the Romane Orators himself makes both great Persons and Friends say of one anothers Opinions, in his excellent Dialogues,_ De Natura Deorum: _And I shall scarce be suspected of Partiality, in the case, by them that take Notice that there is full as much (if not far more) liberty of sleighting their Adversaries Tenents to be met with in the Discourses of those with whom_ Carneades _disputes. Nor needed I make the Interlocutors speak otherwise then freely in a Dialogue, wherein it was sufficiently intimated, that I meant not to declare my own Opinion of the Arguments propos'd, much lesse of the whole Controversy it self otherwise than as it may by an attentive Reader be guess'd at by some Passages of_ Carneades: _(I say, some Passages, because I make not all that he says, especially in the heat of Disputation, mine,) partly in this Discourse, and partly in some other Dialogues betwixt the same speakers (though they treat not immediately of the Elements) which have long layn by me, and expect the Entertainment that these present Discourses will meet with. And indeed they will much mistake me, that shall conclude from what I now publish, that I am at Defyance with Chymistry, or would make my Readers so. I hope the_ Specimina _I have lately publish'd of an