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 of peftilential Difeafes. 5 J in their natural Texture, and the more^ rigid and faline Parts, by a Combination with the venomous Spicula, changed into Difpofi- tions deftru&ive of that ConfHtution they were before deftined to preferve. Whofo- ever then confiders what muft be the neceiTa- ry Coafequences of fuch an immediate De- pravation and Change in that Fluid, which is an abfolute Requifite to all animal A£Hon, will not at all wonder at any of the Affe- ctions whxh are commonly enumerated as the Concomitants of a Contagion * y and a tole- rable Acquaintance with the O Economy, by the Help efpecially of the Authors before referred too, on Fevers and Poifons, will enable any one to account fever ally for their Pro- duction, THIS then beins the Cafe of a Contagion. that a Perfon having a Fever, critically throws off poifonous Effluvia, which were generated during fuch irregular Motion* of the animal Fluids, infomuch as to diffufe for fome Di- jftance round, what will infe£t other. Perfons within their Reach and that fo many have got this Infection, that no Part of the Air, for fome Trad of the Country together, is free from them the poifonous Atmospheres, if they may be fo termed, of the infected, D 4 ex-