Take of the Roots of Jalap, that is ponderous, black and bright, beaten somewhat thick * 1.1 lb j. of Spirit of Wine lb iij. digest them close and hot for two or three days, then put the tinged [or died] spirit into a glassen Cucurbit [or Gourd] a Chymical Vessel so called] and draw it off [or let it evaporate] till the fourth part onely remains; into which if you put or instill cold Water, the Rosin will sink to the bottom of the Vessel, which when you have washed from the dregs and dried it, you may keep for your use. The Dose of the Powder thereof is gr. vj. to xij. or xiv.
In this Preparation the Spirit of Wine extracts or draws forth the sulphureous parti∣cles * 1.2 of that substance, and so much the easier, in as much as these were before hand, of themselves, separated and gathered together in the mixed body; as you may con∣clude from the Veins which are rosiny and shine. Whilest the sulphureous part is extracted, some quantity also of the saline seems to be joined with it; and that is the reason that this Rosin which smells very strong, and is sharp to the taste, purges vio∣lently, and is easily set on fire. This works stronger, and in a less quantity than the mixed body it self when it is whole, for as much as all the active particles are united together, and the dull ones removed.