THE Matter likewise of this Composition in some Measure bespeaks its Usefulness for these Purposes on other Accounts, besides its _Elastick_ Force, because it diffuses into the Air great Quantities of that nitrous Salt, which is known to add much to its Serviceableness in Life: And whosoever considers how much cheaper this is to be procured, and how much easier practised than the firing off Guns, especially in the Middle of great Towns, cannot but be desirous to try it, in Case of such Calamities as are now with too much Reason feared; it may not therefore be unacceptable to give its Composition here. ℞ _Sal. Nitri Partes +iij.+ Sal. Tartari P. +ij.+ Sulphuris P. +j.+ optime misceantur in Mortario, parùm tepefacto, & servetur ad usuum vase bene obturato._ THIS is order’d in a warm Mortar, and to be kept close, because the _Salt of Tartar_ is apt to imbibe a Moisture from the Air, which hinders its Explosion. A Drachm or two put in as close a Heap as possible upon an Iron Plate over any Fire, will in a little Time go off with a Report and Concussion beyond that of any Gun whatsoever; so that in a calm Season, and an infected Air, great Services may undoubtedly be had from its frequent Practice. AS to the curative Part in such a terrible Visitation, it cannot be expected that Rules can be given suitable to every one’s Case but by such as attend upon them; and the most that can be in general laid down to this Purpose, may be collected from the preceding Treatise of Dr. _Hodges_. Although as to the Choice of _Alexipharmicks_, they are certainly best that are most subtile, and capable of being carried by the Course of Circulation into the finest Recesses of the Constitution, whereinto it is manifest the extream Subtilty of the pestilential Poison is capable to enter: And amongst all of this Class, I take _Camphire_ to be much the more preferable; which therefore I would propose not only to be repeated in proper Doses to an infected Person, till a due _Crisis_ is obtained, but also now and then given to those who are well, by way of Prevention. And because some Persons, notwithstanding what has been before said, will be pleased with some general _Formulæ_ to these Purposes, the following are offered to be complied with, or varied, at every one’s Discretion, who is a Judge of such Matters. ℞ _Conserv. Rutæ, Flor. Rorismar. ana +℥ j.+ Species diambræ sine odoratis +ʒ j.+ Balsam. è Mechâ +ʒ [ss.]+ pulv. Croci angl. +℈ j.+ Syr. Balsam. q. s. ut F. Electuarium, cujus sum. quantitatem N. M. omni mane, & horâ somni superbibendo Haustulum Vini albi Lisbonensis, vel Hispanici, tepefacti._ To the Night Dose of this, may be added sometimes 2 or 3 Grains of _Camphire_, especially if a Person feels any Indisposition that requires a breathing Sweat, some may perhaps like the following better.