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 48 7be Caufes and Cure fiances are changeable into a poifonous Na- ture, which before were not only inoffenfive, but ufeful to the Purpofes of Life. Some Minerals, whofe faline Parts in their Pro- duction are naturally blended with good Quantities of Sulphur, are harmlefs, and ufe- ful Alterants, but when by any Means thofe Principles are feparated, the faline Parts be- come ftrong Emetich and Cathartich, even to the Degree of a Poifon. Who does not know that Antimony may be taken crude in large Quantities without any manifefi: Effecl, but that the Chymift can take fomewhat from it, that in few Grains fhall operate beyond the Power or. a fh*ong Constitution to bear ? THOSE Arrows of Death therefore that make fiich dreadful Slaughter in a Contagion., are the animal Salts of infected Per fb 11s, fet loofe from their natural Combi- nations, and fjbtilized into the higheft De- gree of Volatility, by the Agitation and fer- mentative Motion of a Fever. And the Buboes, Carbuncles, <&c* in a ? eft Hence, are nothing elfe but Collections of Particles, or Coalefcences, formed in fiich irregular Mo- t'ons, and thrown out of the Courfe of Cir- culation by thofe necefTary Laws whereby every