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( 5° ) Urine, all which by boiling, get the Tafte of Salt. This firft Matter, or Foundation of the Generation of Metals in Vitriol, which is caficr to believe, fince we fee that all of them by Art may be reduced thereunto, and the Manner of reducing fome of them Ihall be declar’d hereafter. This Vitriol by the Heat of fubterranean Fire, and Attra&ion of the heavenly, fends forth two Fumes or Vapours ; the one earthy, fubtil, and undtuous, and fomething digefted, which the Philolophers call Sulphur, bccaufe it hath the Qualities thereof: The other Vapour is moift, waterifh, flimy, and mingled with very fine Earth ; and this is the next Matter, whereof Quickfilver is made. If thefc two vaporous Exhalations do find a free and wide Paflage out of the Earth, then being carry’d up into the Region of the Air, they are con- verted into Comets, Clouds, Snow, Hail, Thunder, and other Things that appear there. But if the aforcfaid Exhalations chance to be included between hard Rocks, in firait and narrow Places, whence it cannot get out, or the Place be already full of Minerals, the faid Vapours will thicken, and be turn’d into thofe they call half Minerals. If thefe Fumes penetrating the Rocks, do not meet with a kind of clarify’d Brimftone, that fhines like Silver, and is fomething like unto the Fire-ftone, which the Spaniards call Marcafita (without which no Metal can be cngendred) they will ftain the Rocks with fe - veral forts of Colours; if thefe Vapors afcend- jnsr, and endeavouring to get out meet with vunes fo hard as they cannot penetrate thenb