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 6 4 The Caufes and Cure to join with, and cover thofe venomous SpicuU that are on float-, and to mix with the Ani- mal Fluids by Refpiration and Inlinuation into the Pores, whereby they convey, as it were, an Antidote, wherefoever the Poifon is able to penetrate,. and which groifer Va- pours can by no means do. O F this kind are chiefly Storax, Benjamin^ Franhncenfe, and all the Aromatick Roots and Woods ; and amongft them all, I cannot think the Smell of Tar, Pitch, &c. is inferior in any Refpect.s,where its Scent is not particular- ly ofrenfive. And thefe Things fhould be burnt at fuch Difxances of Time from each other, that the Air may be always fenfibly impreg- nated with them. BUT as lome have fad Apprehenfions from the Air being ftill, and as it were ftag- nant at fuch Times, and not without good Reafbn, as it favours the Collection of poifo- nous Effluvia, and aggravates an Infection ; for the Prevention of whichj it is propofed at certain Intervals to fire off great Guns, and the like : I cannot but imagin, that for this End, it would be much more effectual to let off fmall Parcels of the common Pulvis Ful- minans i in iuch Openings of a large Town, a s ) Squares