Errata

the Earth, be scorched up and wither'd, nor pass into the pores of Plants: Sixthly, he delivers the Artificial manner of Extracting and Refining of Niter; after he had first inform'd his Reader, How it may be known, whether a place be impregnated with Niter or no? Seventhly, he giveth the Vertues and Uses of Niter; first in Physick; where he affirms it to be not only Cooling, at least by removing hot humors, whereby the Body may become cooler; but also Resolving, Purgative and Diuretical: Upon the score of all which properties 'tis used not only in Burning Fevers, in the form of the Lapis prunella; (the preparation of which he describeth;) but also in those Diseases, in which are to be discharged by siege and Urine, hot, sharp, choleric and obstructive humors. Having dispatched this Medicinal use, he proceeds next to the use of Niter in Chemistry; where he observeth that by it may be made a pleasant and cooling Acid; or a hot and burning Corrosive: that sometimes it revives the Vomitive and Purgative vertue of Antimony, sometimes it kills the Vomitive, and reviveth only the Purgative; and sometimes it destroyes both, and quickens neither the Diuretick or Diaphoretick, &c. besides that it Calcineth, Sublimeth and Dissolveth Minerals and Metals. Thirdly, he adds the Use of Niter in Artillery; where he discourses of the reason of the Composition and Force of Gun-powder, together with the Use and Office of every Ingredient of the same. Fourthly and lastly, he sets down the Uses of Niter for Refiners, Dyers and Cooks. ADVERTISEMENT. The Author of the Discourse concerning Mineral waters, in Numb. 60, beginning p. 1074, desireth, that these lines may be inserted p. 1081, after the word Dysenteries, l. 19. viz. Neither do I think this water any thing the worse because of the Alone, but much the better for it in Hypochondriack maladies: For by its adstringency it defends the Tone of the Liver and the other natural parts, which otherwise are apt to be debilitated by purging and penetrating medicines; it being, according to Galen's advice, ever necessary to intermix some Adstringents with Hepatick remedies; in Art. Med. c. 95. to which agree very good writers, antient and modern. Errat. p. 1096. l. 2. r. if he hit. LONDON, Printed by T.R. for John Martyn, Printer to the Royal-Society. 1670.