178 Of the Arsenic 



matter, if, for the greater perfpicuity (till, be add- 

 ed the epithets, ccarfe, mock-ieady, and poor. 



Now in fmehing-furnaces, where the arfenical 

 matter fkims off, or rather evaporates from the 

 metal defigned to be procured, I know" of nothing 

 elfe, which, as an arfenic form, fliould here deferve 

 a place ; all to be found there, and referable hither, 

 being either poifon-meal and hut-fume^ or poifon- 

 Jlone, that is, furnace- fragment. For the external 

 images appearing in many places in cluflers, or 

 flakes, and the like beautiful confections on this and 

 the other furnace- fragment , according to the de- 

 fcriptions of the ancients, and bare copyings of the 

 moderns, are very rare with us at Friberg, nay, 

 they are not at all obfervable, and are, properly, 

 fomething procurable rather from actual calamy- 

 works, than from ore-fmeltings, feeing they ap- 

 pear in all manner of zinky flowers, and the like 

 efflorefcences, in the courfe of brafs-making. 



We are not, however, to fuppofe arfenic, like 

 fulphur, to be entirely diflipated in roafting-hearths, 

 and in furnaces, for more than a little of it fluxes in a 

 metallic form along with any thing capable of re- 

 taining it •, fettling together with the metal, as in 

 a regulus, in the fore hearth ; bearing the being 

 tapped off therewith; not mingling, 'tis true, with 

 the metal, but parting from it, floating a-top, and 

 bearing, after cooling a little, to be heaved off 

 From it, like a cake. Yet, in the method of 

 crude-working we obferve, that what of it remains 

 unvolatilifed, goes into that regulus ufually called 

 crude-ftone^ without being able to appear in the 

 above feparated form •, becaufe the metal, whether 

 lead or copper, which fhould, and does repel it, is 

 not yet arrived t® its due metallic body, but is ftill 



greatly 



