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 3 1 An Hiftorical Account a Difcovery of the Mature of this Pefti- lence. Wherein, for Method Sake, I ftiall begin with a Defer iption of a Peftilence in general ^ and which if it doth not exa&ly agree with the Accounts given by the Ancients, yet I doubt not but it will be found, by every impartial Confiderer, to be as full and fatis£tory. THE Peftilence is a Difeafe arifmg from an Aura that is poifonous, very fubtle, deadly, and contagious, affe&ing many Per- fons at the fame Time together in one Country, chiefly arifing from a Corruption of the nitrous Spirit in the Air, attended with a Fever, and other very grievous Symptoms* EVERY one of thefe Particulars are as clear as the Light at ISIoon-day j and thefe Explications are lb obvious to be met with in the Writings of the Learned, that it would be loft Labour to infift upon any fuch Thing here *, we fhall therefore proceed to explain only what more im- mediately ftands in need of it. AND firft of all it is faid from an Aura 7 as diftinguifhing it from fuch Poifon -as