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CHAP. IV. Of Stones.
1. IN the two preceding Chapters, having run through the Mineralia media; the Earths, Salts, Sulphurs, and Bitu∣mens; the order of Nature next requires me to descend to the Stones and Metalls, the two remaining species of the Mine∣ral Kingdom, which will be both absolv'd in this, and the following Chapter. How all stones were chiefly made out of Salts with a mixture of earths and sulphurs, was shewn in generall, in the Hi∣story of Oxfordshirea 1.1, I shall only add here the particular Method nature seems to use in the production of them, and then consider the several species worthy notice in this County. It has been an opinion that challenges no great seniority, that Stones are coagula∣tions of Salts and earths, which if finely mixt, sublim'd and perco∣lated by the means of heat, and after condensed by cold, make a transparent stone; and if but grosly mixt with little or no perco∣lation, an opake one; wherein though I cannot deny but there may be some-what of truth, yet I think it will be more particu∣lar, and more home to the business, if we further add, that this coagulum or petrification is rather made upon the meeting of the solutions of acid and Alcalizat salts; and that these doe compound transparent, semiopake, and opake stones, according as they are more or less mixt with sulphurs, and earths, of different finenesses and purifications.
2. And this I take to be very probable, because we know of no things in nature that unite so strictly as these two doe, makeing a coagulum in bodies that at first sight seem very unlikly to performe any such matter; witness the offa alba of Helmont, a thick gross substance, far from the nature of a liquid, made out of the spirits of wine and urin highly rectify'd; and another such like Offa made of the spirits of Ʋitriol and Salt, by a solution of Saturne made with distill'd Vinegarb 1.2; to which add the coagulum made out of equal quantities of spirit of Sal Armeniac and spirit of Wine mixt, and shaken together in a Viol; and all these upon union of the acids, al∣cali's, and sulphurs, or whatever other principles they be, that con∣stitute these bodies. Thus transparent stones having little or nothing of those terrestrieties the opake ones have; seem to be made of pure solutions of such like salts, and transparent Sulphurs, or Ambers,