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of peftikntial Vi/eafes. f T O this Caufe, 'tis very probable, is owing the Frequency of the Plague at Grand Cairo in Egypt, and in the bland of Sardinia, as Taufanias and others relate : Although indeed Proffer Alfinus (a) charges a great deal of the Caufe of that at Cairo, upon their continual Commerce with fuch Nations as are feidom without fuch infe&ious Difeafes. And for this Reafon it is, that we find all thole Countries, which mofl abound with Swamps and Standing Waters, to be moil unheal thful, efpecially in the hotter!. Seafbns^ except, as in feveral Parts of Italy, fuch Lakes have any Communication with the Sea, or fome large Rivers. To this Purpole Pifi (b) frequently obferves thole Places to be moix fubjecl to fuch Calamities, where there are conftant Heat and fettled Calms, as fuch a Temperament of Air moft difpofes Bodies to Putrefa&ion and Corruption, as in St. The* mas JJland, and Guinea : And, On the con- trary, that notwithftanding the Intenfenefs of Heat, if the Fluids are but agitated by Winds, Tides, and Currents, there is little. Danger, of fuch Difeafes } and the lefs ftill, the more regular and conftant the Seafons are upon (a) DeMedicin. Egypt. Lib i. Cap. 15. (*) Hift. India and BrafiL