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Of the causes and reasons of spagiricke pre∣parations of simple purgations.
HYpocrates, in his booke de natura humana doth write, that purging medicines doe drawe vnto them the humors which are vn∣naturall in the body, not by a common mingled quallitie, but by the simillytude or property of the whole substance, and an in∣grafted famillyaritie. Whose sentence Galen confirmeth against Asclepiadem and Erassistratum, who thought that purging medicynes, could not drawe any one humor, * 1.1but whatsoeuer they touched, they could conuert & turne it into their owne nature, and so indifferently like leaches or boxes, to draw the sharpe thinne humors as is most apt to purge, rather then grosse and thicke: But whereas al al∣terations are done either by force of heate, or by driuing away the emptie, or by a similitude of the whole substance, that onely (as Galen writeth) is done with the Sim••athiae of quallities, or els with the likenes of the whole essence: which things though I haue plainely shewed them, yet they cannot be expressed with wotdes, and the Greekes call it 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, that is a propertie, which can∣not be declared. So the Amber doth draw strawes, and the loadstone Iron: by which reason it is saide that Rhabarbe expelleth coller, Agaricke fleame, and Senna blacke chol∣ler, although besides this peculier power of purging, e∣uery one of them haue a certaine generall facultie to drawe other humors, which is to be iudged by the com∣position of many medycines, with which we vse to purge diuers humors, which alone would not suffice to purge by themselues, if those simples did not worke together, with naturall helpe to euacuate, & with a common force did prouoke the expulsiue power. It is ment (saith Galen) that the simples mingled together doe agree and not dif∣fer * 1.2in any thing. Amongst these medicines some bee dy∣gestiues of choller which cheifly euacuate yellow choller▪ some of fleagme, that euacuat fleame, some of mellan∣cholly