It is with the greatest Pleasure we enter upon the Method of _preventing_, tho’ not of _curing_ this _insidious_ Enemy of Mankind, which very justly has filled the World with Fear and Horror. For this Reason, and that Matters may proceed not only in greater Order, but also with greater Truth, Dr. _Mead_ has gone through much _Philosophy_ and _Theory_ in _Medicine_, with great _Labour_ and _Fatigue_; even to _fainting_ away, _despairing_ often in doing any thing to his own Satisfaction, knowing by much Experience, that the World is not so hard to please. And therefore, he begins this second Part, by telling us, how great a _Satisfaction_ it is, _to know that the Plague is no Native of our Country_. I hope he is satisfy’d with this Conceit, but I am afraid few People find any new Assurance, and Courage, springing up in them, upon this Assertion; or that they can have a better Heart to face the Plague more boldly, if it should be our Misfortune to have a Visit from it at this time. But in what Page does this Demonstration lie? He has only told us, hitherto, that the _pure_ Air is only _infected_ with _pestilential Steams_, that rise out of Bogs; or out of Men that have died of the Plague; or else that these Steams were packed up in Goods, and with them carried from one Country into another: and tho’ this be bravely told, without any Reason assigned for it; yet we know not where they first have their Origine, and of what Country they are Natives. We have seen an Original English Plague, that came from no Place in the World, and took up its Abode altogether here; and whether all the rest, that have afflicted our Island, are Natives or Foreigners, is nothing so clear, as to build any great Satisfaction upon. And therefore, I do think, with the Doctor, that all Means should be found out to _keep our selves clear from it_; tho’ we can find no great _Encouragement_ from what he yet has told us. This Caution, as he tells us, consists of two Parts: _The preventing its being brought into our Island_; and, _The putting a stop to its spreading among us_. But, as the Doctor has a very ill Memory, and seldom performs what he promises, give me leave to put him in mind of a Promise, in his Preface; that _his Method will be different from that taken in former times among us, and from what they commonly do abroad_: Tho’ we have no Encouragement to think, that _it will prove agreeable to Reason_.