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IT is a wonder of Nature, that the very same thing which causes in Man such extremities of torture, ••••ould become to the same disease so good and certain a remedy: this is experimented in the Stone of the Bladder, which without any other preparation than being reduced to small Powder, may be administred from ℈ i. to ʒ i. in white Wine, or decoction of Burredock Roots and red Nettles, to dissolve the Stone in the Bladder, and expel gra∣vel and slime from it and from the Kidneys: but those Re∣medies being heightened by Chymical preparation, are much more efficacious, and do act with a much greater quickness.
Take then a parcel of these Stones, reduce them to powder, and joyn with 2. pintes of Beach Goal pulverised, and thus be∣ing put in a well luted Crucible, calcine it with a circular or rever∣beratory fire, the space of five or six hours; and being cooled, grind your matter upon a Marble, and, with some diuretical Wa∣ter make a Lye thereof; o••, with Phlegm of Salt-Peter, or Al∣lom, filtrate and evaporate till it skins; then in a cold place draw your Crystals, and so continue to do, till you have extracted all the Salt; which if you find not yet sufficiently cleansed, put it again in a Crucible, and let it grow red-hot in the fire without fusion, then purifie by reiterated solutions, filtrations, evapora∣tions and crystallizations, until you like it. You must keep this Salt well dryed, in a Glass Viol well stopt, lest by the attra∣ction of Air, it should contract moisture. The dosis is from iv. grains to viij. in appropriated Liquors, to facilitate the excreti∣on of Urin, dissolve and expel the gravel and slimy matter in the Reins and Bladder, which most commonly are the occasional cause of generating the Stone.
But if you will have an Essence or Elixir out of it much more efficatious then this Salt, calcine the Stone with equal weight of well purified Salt-Peter in a Crucible with a circular fire, the space of six hours; then extract the Salt from the matter calcinated, with Spirit of Wine, filtrate, evaporate, and draw your Crystals, and when they are well desiccated, put them to digest in a double Vessel in Baelnei vapore, with rectified Spirit of Wine: then co∣ver