This oyle hath been long used by Chirurgions, for they have with a feather applyed it to wounds almost uncurable, to separate impurities, for the acceleration of the cure, that afterwards other medicaments being applyed may the better operate. But it is better if it be mixed, with spirit of Salt, for they are easily mixed and it is made more mild thereby, and the too great corrosive faculty thereof is mitigated. Neither is there any other besides the spirit of Salt, with which this oyle can be mixed, unless it be the strongest spirit of Nitre, for the weak spirit of Nitre precipitates the butter of Antimony, as you may see in the preparation of _Bezoardicum Minerale_. But the strongest spirit of nitre dissolving this butter, makes a red solution of wonderfull Vertue in Chymistry, of which we are not to treat in this place; and if this be drawn off again by distillation, it leaves behind the first time a fixed Antimony, and Diaphoretical, which otherwise must be drawn off twice, or thrice, _viz._ if it be weak, and not able to dissolve the butter without precipitation. Now this _Bezoardicum_ is the best, and safest Diaphoretick in all diseases that require sweat, as in the plague, French pox, feavers, scorbute, leprosy, _&c._ if it be given from 6. 8. 10. to twenty grains in proper vehicles; it penetrates the whole body, and evacuates all evil humours by sweat and urine. _The Oyl of =Arsenic= and =Auripigmentum=._ As the spirit of salt doth not easily work upon Antimony by reason of the abundance of crude sulphur, unless it be reduced into flowers, in the preparation whereof, some part of its sulphur is burnt; so also _Arsenic_ and _Auripigmentum_ are hardly dissolved with spirit of salt, unless they be reduced into flowers, and the spirit of salt be very strong, which may be able to work upon it. These may be distilled by retort like Antimony into a thick heavy oyl; which being used in cancrous eating ulcers, exceeds that of Antimony in mortifying, mundifying, and purging those evils. After the same manner may corrosive oyls be made out of all the realgars being ordained for outward uses. _Oyl of_ Lapis Calaminaris.