The Authors constant Absence from the Presse, whilst the former Treatise was Printing, and the Nature of the Subject it self, wherewith ordinary Composers are not wont to be at all acquainted, will, 'tis hop'd, procure the Readers Excuse, till the next Edition, if the _Errata_ be somewhat numerous, and if among them there want not some grosser mistakes, which yet are not the only Blemishes these lines must take notice of and acknowledg; For the Author now perceives that through the fault of those to whom he had committed the former Treatise in loose Sheets, some Papers that belonged to it, have altogether miscarryed. And though it have luckily enough happen'd, for the most part, that the Omission of them does not marr the Cohaerence of the rest; yet till the next design'd Edition afford an _opportunity_ of inserting them, it is thought fit that the Printer give notice of one Omission at the End of the first Dialogue; and that to these _Errata_ there be annex'd the ensuing sheet of Paper, that was casually lost, or forgotten by him that should have put it into the Presse; where it ought to have been inserted, in the 187. printed Page, at the break, betwixt the words, [_Nature_] in the 13th. line, and [_But_] in the next line after. Though it is to be noted here, that by the mistake of the Printer, in some Books, the number of 187 is placed at the top of two somewhat distant pages; and in such copies the following addition ought to be inserted in the latter of the two, as followeth.