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 from a Teftilencel 2 of Corruption of Air ^ but of this we have faid enough already •, and as howfoever this Matter is, a Purgation of the Air is by- common Confent called for on all Sides in thefe Cafes, we mall confider this Matter, chiefly in thefe two Refpetts. FIRST, That the peftilential Semimum be diflodged} and to this Purpofe contri- bute brisk Winds, efpecially from the North , and the frequent Explofions of great Guns, in the Morning and Evening chiefly ^ be- caufe fuch Concuilions agitate the poifbn- ous Miafmata y and not only help to diilipate them, but to change and alter them in thofe particular Configurations whereby they become fo noxious - and it hath been attefted by Experience, that an intimate Combination of Nitre and Sulphur greatly alters the faline Qualities of the peftilen- tial Taint* SECOND LT, The utmoft Diligence is to be ufed to prevent the peftilential Par- ticles from taking Effect. } which is fuccef- fully done by proper Fumigations. Hif* ' pocrates y the Oracle in Phyfick, hath left it to Pofterity, to kindle Fires in the pub- lick Streets - 7 and thefe fometimes I con- ceive