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and a Contagion. 45 A S to the fpreading of a Contagion from one to another, and fo on to Thou- fands, there is nothing can be poflibly more fvvift in the Progrefs of Fire^ and it exceeds even Antimony in the Retention of its Properties, though that lofes them not in a thoufand Infufions : But the in- jftantaneous Progrefs of this Enemy to Man- kind is beft illuftrated by the Rapidity of Light, which is not greater. But more of this we pafs by till we come profeffedly to fpeak of a Contagion. SECONDLY, The particular Nature of the peftilential Miafmata, may be known from their peculiar Influence upon the faline Particles in a humane Body -, for nothing a£ls with more Efficacy and Ener- gy upon a faline Body, than another par- taking of the fame Quality • and nothing is more plain than that this nitrous Spirit is of more Efficacy than the Alkaheft it felf, as by it the fibrous Parts of the Blood are immediately corroded and diflolved ^ and therefore after dangerous Hemorrhages, very little Coagulation can be obtained in the extravafated Blood, unlefs by its be- ing expofecl to the Cold} but as often