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 of pefiilentidl Difeafes. 67 pra&ifed, becaule while the Poifon is on Float in the Air, it may undoubtedly be entangled fo as to lofe its Power of acting as fuch • but then for this Purpofe fuch Things ought to be ufed as exhale very fubtile Sulphurs as the fpicy Drugs and Gums. And on this Account I fufpecl: Wood-Fires to be bad becaufe they raife into the Air a very grols and vifcid Humidity, which is not only very unfit to lay hold on, and unite with, the ex- treamly minute Agents that are to be provided againft, but alfo carry into the Lungs with the Air in Refpiration, fuch Particles, as difpofe of themfelves to VifciditieSj and fuch Changes in the Blood, as are the Production of the worft Fevers, without any other co- operating Caufe j for the Fire only forces out that Moifture, which, while a Tree, is in its Growth, naturally perfpires from it - and how an Air fo impregnated is like to be of Service againft a Peftilence, any one may foon be a Judge, who confide rs thole Kinds of Fevers which are molt commonly epidemical in wood-land Countries. SUCH Drugs however as are from a. vegetable Produclibn,and abound with fubtile, volatile Parts, are Ol Service to be exhaled into the Air. this way, both by their Fitnels to