27S Of the Vitriol 



place, both what precipitates in the boiler, and 

 what afterwards falls down before and in the ad of 

 cryftallifation, alfo what precipitates from the re- 

 cryftallifation of a vitriol; though none of thefe 

 properly deferve the name of an earth, or ochre, as 

 they ftill retain much acid fait •, and further, iuch 

 earth as fpontaneoufly precipitates from pyrites, 

 particularly the arfenical, or white fort, after cor- 

 rofion or maceration by fharp waters. The orange ', 

 or yelky yellow, is principally found in the earth 

 in chinks or clefts, under the names gur and /in- 

 ter; alfo in many fprings, particularly the medi- 

 cinal, in thermae i in vitriolic or acid waters ; and 

 from vitriol itfelf, when not burnt quite to a rednefs. 

 Hither alfo is referable, on account of the name, 

 foffile ochre, or mountain-yellow ; this yellow earth, 

 ufed for colouring, containing alfo fomething of a 

 vitriolic earth ; hence it alfo yields fome metal, but 

 iuch as is not derived from vitriol. 



As to the red earth of vitriol, it is called the c&* 

 gut mortuum of vitriol; not as if it was quite yield- 

 fefii fince it not only contains the above gilla, but 

 alfo metal, and that plentifully; but rather, as by 

 the ftrongeft degree of fire, it is deprived of its 

 faiine, fapid parts. It is now, as it was long ago, 

 called colcothar; others denominate this vitriol- 

 earthy copper-red; fo far indeed not unjuftly, as 

 vitriol is commonly called copper-water ', or as cop- 

 per appears red, tho' not fundamentally enough, 

 in regard this copper-red is often an iron-earth ; and 

 though it were a copper-earth, yet the former is 

 always a beautiful red ; the latter, on the contra- 

 ry, a dirty and black red, nay, ufually appearing 

 entirely blackifh. Further, it is called red vitriol y 

 or atr amentum rubeum, but as it is only in part, and 

 ixot entirely, it deferves not the appellation, vitri- 



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