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( 49 ) ^nd as deep as they can, the circumjacent Earth falls in, and fills them up again ; and in the Space of ten or fifteen Years at mo ft, they work thofe Mines again, and thence draw out abundance of Metal, which this new Earth hath been converted into ; many do think the fame happens in the rich Hill in Potoji; at the leaft all of us know, that the Stones, which divers Years we have left be hind us, thinking there was not Plate enough in them to make it worth our Labour, we now bring home, and find Abundance of Plate in them, which can be attributed to nothing but to the perpetual Generation of Silver. ’ The Alchymifts, a Name grown odious, y Rcafon of the Multitude of ignorant Pre tenders to that Art, with more profound and Pta&ical Philofophy have anatomiz’d the Mix- tures of Nature, and reduc’d them from their hr/t 1 rinciples.; and concerning the Matter of Metals, do difcourfe in the Manner fol- towrng The Sim, ,;hey fpy, and all the Stars rin L, g r,1 V or borrow’d, con- J nually going rduhd thp Earth, doth heat he fame, and with their fubtil Ravs penc- frate through it’s Veins ;.and we’ fee things ”>ng burnt in the Fire, are converted into . 'her terene Subftances, as Wood and Store Lime and Afhes; fo in like manner the an,[ft C ; ll< I inCc1 b >;' he CeItfliaI B ^i«, mingled other°' I . cd w ‘th Water, changes itfelf into the fom„n ° f S P cc,es > Biat contains in itfelf lum "v® 0<: Bie Subftancc of Salt and A- the T , y I)a y wc fee the fame Effedts in oes made of Lime, A Ores, Sweat ani E> Urine,