The _Panacæa_ is made of sweet Sublimate, and the later of corrosive Sublimate: To make the corrosive Sublimate, put sixteen Ounces of _Mercury_ reviv'd from Cinnabar, into a Matrass, pour upon it eighteen Ounces of Spirit of Nitre; place the Matras upon the Sand, which must be somewhat hot, and leave it there till the Dissolution be effected: Then pour off this dissolved Liquor, which will be as clear as Water, into a Glass Vial, or into a Stone-Jug, and let its Moisture evaporate gently over the Sand-Fire, till a white Mass remains; which you may pulverize in a Glass Mortar, mingling it with sixteen Ounces of Vitriol calcin'd, and as much decrepited Salt: Put this Mixture into a Matras, two third parts of which remain empty, and the Neck of which hath been cut in the middle of its height; then fix the Matras in the Sand, and begin to kindle a gentle Fire underneath, which may be continu'd for three Hours; afterwards let Coals be thrown upon it till the Fire burn very vehemently, and a Sublimate {177} will arise on the top of the Matras; so that the Operation may be perform'd within the space of six or seven Hours. Let the Matras be cool'd, and afterward broken; avoiding a kind of Flower or light Powder, which flyes up into the Air as soon as this Matter is remov'd; whereupon you'll find nineteen Ounces of very good corrosive Sublimate; but the red _Scoria_ or Dross which settleth at the bottom must be cast away as unprofitable. This Sublimate being a powerful _Escarotick_, eats away proud Flesh, and is of singular use in cleansing old Ulcers. If half a Dram thereof be dissolv'd in a Pint of Lime-Water, it gives a yellow Tincture; and this is that which is call'd the _Phagedonick-Water_.