❧Of the Potentialle Cauteryes, & how we ought to make them. Chap. 3.
* 1.1THe potētiall Cauteryes are tho∣se, vvhich through theire intol¦lerable, & extream heate, being vvith their forces set to vvorke together vvith the benefites of our naturall caliditye, burne as it vveare a fyer in that parte, vvherone they are applyed, leavinge behinde them an Escara, or crust: Of the vvhich the matter of the Corrosi∣ve is in great number, and hot, vnto the fourth degree: Amōgst the vvhich ther ar som, vvhich are extreame hott, & a little gentler, accordinge as their operatione is tardive. Amongst them are numbred, the Cantharides, the Tartre, the common Vitrioll, or the calcined, the vnslissed lims, the Auripigment, the Arsenicvm, the su∣blimate, the Aqvafortis, the Oyle of Vitriolle vvith more others) the vvhich vve novvadayes, doe seldome vse, in such sorte as they are, vvith out praeparinge, or mixinge of them, to make any Fontanelles, because that experience, hath taught vs some, vvhich are farre more conve∣nient, & lesse daungerouse.
* 1.2The actuall Cauterye, is much conveniēter▪ then the Potentiall, vvhether it be vve consider on the nature & substāce, on the healthfullnes festinatione, and certayntye, in operatione: for the fyer, is a simple element, havinge noe other forces then by the heate therof, & exsiccation, vvithout havīge associated vnto it anye venou∣mousnes, vvherfore the operatione therof is festivous, certayne, & healthfull, pearcing dee∣per therine vvhen vve please, vvithout causing anye accidentes in the circumiacent partes, al∣thoughe, that thervvith vve chaunce to touch them, & that because of the subtilenes therof, and consideringe the virtues of his substance. It is an enimye vnto all corruption, vvherfor, it freethe alsoe from all covruptione, & putre∣factione, yea it consumeth all venoumouse matter, & qvallityes, vvhich in that parte might lye occulted, and hidden, consumeth also all su∣perfluouse humidityes, and correcteth alsoe all vntemperate coulde, and moysture.
VVher on the contrarye, the matter,* 1.3 vvherof the Potentiall cauteryes are made, are oftenti∣mes venoumouse: And hovv soever they be praepared, yet ther operatione, & actione, is vn∣certayne, retardate, and slovve, and sometimes alsoe daūgerouse, vvithout simplye knovvinge the vittues therofe, & hovve to limite his ope∣ratione: Because somtimes it spreadeth it selfe broader, then our meaninge is it shoulde, and causeth more detriment, and harme in corrosi∣one, then vvillinglye vve vvoulde, it shoulde, because it doth not only combure & burne the place vvhereone it is applyed: But beinge vni∣ted, vvith our naturalle caliditye, it extendeth, and pearceth alsoe deeper in the fleshe then is necessarye it shovlde, vvherthroughe that par∣te beinge by little, and little calefyed, and vvar∣med, it imprinteth not onlye one that place his venoumouse nature, but extendeth it self far∣ther, throughe the circumiacent vaynes, & Ar∣teryes, & Synnues, in the vvorthye partes, spoy∣linge, & oftentimes burninge, the good, & vvel disposed complexion of that parte, out of the vvhich commonlye follovve verye badde acci∣dentes, and vlcerations, vvhich therafter verye difficultlye vvilbe cured, yea also some times a Gangraena.
Notvvithstandinge althoughe the Chyrur∣gians novveadayes, are boulde enoughe in the application of actuall Cauteryes, novvithstan∣dinge most commōlye they vse the potentialle consideringe the feare, & affrightednes, vvhich the Patientes conceave therofe, soe that the ac∣tuall Cauteryes are allmost therthroughe re∣lapsede into oblivione: It is right true,* 1.4 that the Potentiall Cauteryes vvhich novve adayes vve vse are indeede of velvet, & verye excellēt, & vvhere of I never as yet knevve anye badde accident to follovve, throughe the longe vse vvherof, vve have learned the certayntye hovve to make them.
VVe must note, that in the Potentiall Caute∣ryes, or Ruptoryes, vve adde nothinge, vvhich hath any venoumouse nature or qvallitye: Be∣cause they, cōsidering their virtues, are through our naturall calliditye compelled to doe their operation, vvhich by little, & little suscitateth, the redormitinge, & soporiferouse forces ther∣of, soe that it is not possible, but that of necessi∣tye, this venoumouse nature, must imprint so∣me parcell of her venoumousnes in that parte, if soe be at the least ther be any venoumousnes mixed thervvith: vvherfore most commonlye one this sorte vve praepare it, that immediatlye it might shevve forth his operatione.
VVe make novve adayes Cauteryes in form of Trociskes, of divers kīdes of Ashes, Saultes,* 1.5 & limes. The ashes are made of Oackē vvood,