14. Salt of many Virtues.
℞ Pure Nitre, Sulphur, a. ℥ viij. beat them into very fine pouder, sift them and mix them together; which done, put of the mass by spoonfuls into a Crucible red-fire-hot, upon a good fire, and let the matter burn till it becomes grey or reddish; this dissolve in boiling Water, filter thro' Paper, and evaporate to driness; so will you have a white Salt, which keep for use.
It is a famous thing in Agues, powerfully opening, if it be put into the ordinary Drink of the Sick; it purges serous Hu∣mors by Stool, and sometimes by Urine. Dose, ʒ j. at a time, in Beer or Water; or two or three drams, in a quart of Wa∣ter, that it may be made like to the Medicinal Waters at Tunbridge, &c. it cools, and notably opens Obstructions.