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 and a Contagion. 55^ without any Perception of either having been in this Medium* HENCE it is ftrongly conjectu- red how the peftilenti.al ^Semimum comes to be hid fo fecretly in the Poroiities of the Air, fo as to be conveyed from one Country to another, and to travel unper- ceived into very diffcant Regions. Further, as this Medium is more ftill, it is fo much the more capable to receive the pefKlential Infetlion j whereupon Places that are clofe, confined, and dark, as Prifons, and Houfes in Vallies, are much more liable to Conta- gion, than Situations upon Eminencies, where the Air is frequently agitated by Winds j for the malignant Effluvia cannot fo well fix in an Air fo tumultuoufly hurried about •, and they are like wife ren- dred lefs hurtful by a continual Mixture of frefli Air with them. THIRD LT, A fuitable Difpofition of the Subject is very neceffary for the Re- ception of the pefHlential Taint - 7 and this Difpofition refpeds either fome Fitnefs in the Pores of the Body, or a long Accu- mulation of diftempered Humours. The more open the Pores are, and the wider, $ 4 ^w