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 arid a Contagion. |j is is more grofs and earthy • for this is not to be confined in any Inclofure, but is fo rare, fubtle, volatile, and fine, that it infinuates into, and refides in the very Inter- ftices, or Pores of the aerial Particles - 7 whereas that which is of a more fixed Nature, is confined within certain Limits, and is incapable of fuch Progrefs. 1 T is faid to be poifonous alio, from its Similitude to the Nature of a Poifbn, both being equally deftructive to Life,; and killing Perfons much after the fame Manner, fo that they feem to differ in Degree only - for the deadly Quality of a Peftilence vaftly exceeds either the arfeni- cal Minerals, the morl poifonous Animals 6r Infe&s, or the killing Vegetables j My} the PefKience feems to be a Competition of all the other Poifons together^ as well as 'in its fatal Efficacies to excel them 5 for in this there is manifeflly joined both the Height of Putrefaction and Malignity. And as in a great many the Virulence of this Taint hath been difcoverable, fo in one Youth for Inftance it was fd remarkable^ that even in the Point of Death the whole Body changed green, Which lo alarmed the Mother, that ihe immediately hafted D id