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CHAP. II. Of the causes of the Plague. (Book 2)
THose sicknesses which are contagious and pestilent (euen as al other kinds of in∣firmities) haue their causes. For nothing may produce without an efficient cause that bringeth the same to effect: The Plague then hath his originall & produ∣cing causes, from whence shée taketh ori∣ginall beginning: and is engendred by a certaine and more secret meanes then all other sicknesses. For, for the most part the causes of priuate sicknesses which are not in∣fectious, are either to great repletion, or a generall deprauati∣on of the humours which are in the body, or obstruction, or binding, or putrifaction, as Galen in his Booke, (Of the Causes of sicknesses) hath very learnedly written. But the Plague hath none of these aboue mentioned causes, but only contagious and pestilent: yet notwithstanding together with these causes of repletion, Cachochimie, obstruction, & putrifacti∣on, the Plague may bée annexed and vnited; but yet in such sort, as they be not the proper reputed causes which ingender the Plague, for then if yt should follow, all sicknesses accompa∣nied with such like causes might be reputed pestilentiall, which were both vntrue and absurde: It behooueth vs therefore, to finde out a proper and continent cause of the Plague, and such like contagious infirmities. Let vs then conclude with Ga∣len, in his Booke Of Treacle, to Piso, and Pamphilianus, that all pestilentiall sicknesses, as from the proper cause, are ingendred from the ayre, depraued and altered in his sub∣stance, by a certaine vicious mixture of corrupted and strange vapours, contrary to the life of man, and corrupting the vi∣tall spirit: which vnkindly excretion sowed in the ayre, and infecting the same, communicateth vnto vs by our conti∣nuall alteration of the same, the venome which poysoneth vs.