which the corrosive Spirit does give to the Camphire in its dissolution; but by rea∣son this preparation is never given inwardly, those scruples are caussess; Medicines much more acrimonious than this are commonly used, and yet esteemed without peril: and considering the uses it is put to, the Spirit of Nitre seems to be of absolute necessity, for the Oyl does so much the more and better, cleanse and scale rotten Bones, and foul Ulcers, and cause them to heal. § 7. This Oyl is only a dissolution of Camphire in Spirit of Nitre; for if you mix Water with it, and so destroy the force of the Spi∣rit, it will return into Cam∣phir as before: And of all the Rosins, this is the only one that will dissolve with Spirit of Nitre: from Camphire ℥iij. you will have of Oyl ℥iv. the Spirit of Nitre losing an Ounce in the dissolution. § 8. This dissolution is made with∣out ebulition, or sensible heat, for Acids mixing with Sul∣phur never make any ebuli∣tion, because Sulphurs always submit without any resist∣ance; and Camphire consist∣ing of thin disunited parts, the Acids softly enter among them, and make an easie se∣paration: § 9. Le Febure has a compound Oyl of Cam∣phire, which is made after this manner: ℞ Camphire in gross Pounder ℥vj. Spirit of Ni∣tre lbxij. put them into a Ma∣trass, which stop with another, the neck of the one going into the other; lute the Juncture with a Bladder and Whites of Eggs, and digest in B. V. till the Camphire is dissolved and become an Oyl, swimming a∣bove the Spirit: separate the Oyl, and add thereto rectified Oyl of Amber, Oyl of Juniper Berries, A. ℥iv. digest till they are united, then distil in a glass Retort in Ashes, cohobating three times; after which, re∣ctifie upon Colcothar of Vitriol, till the Oyl comes forth clear, depurated, and fluid, the Cam∣phire being made incorphoreal, and perfectly turned into an Oyl. § 10. This Oyl is Su∣dorifick, and of mighty force to expel the malignity of the Plague, or Pestilence, Spotted Feaver, Measles, and Small∣pox, and Poyson itself. It is also a Preservative Remedy in time of Plague, being both inwardly taken, and outward∣ly applied. Inwardly, let it be taken, reduced into a dis∣soluble Balsam, with double or treble refined Sugar in Pouder: Dose three or four drops in a Glass of Wine: Outwardly, let the Nostrils,