176 Of the A r s e n 1 c 



be limited, efpecially if we would not confound it 

 with that I am now to fpeak of, and from which 

 it differs not a little. But, as is already faid, it 

 contains the leaft arfenic poflible, difcoverable 

 upon roafling it, rather by the nofe than by the 

 eye ; but it partakes of fulphur in a greater pro- 

 portion, as appears alfo from the roafling, and as 

 may eafily be conjectured from the ground-mix- 

 tion of this zinky matter. In a word, it fmells 

 partly arfenical, partly fulphureous ; as fulphur 

 may, intangled in fuch calamy admixtures, re- 

 fill the hotted glow, fo much more may arfenic, 

 which commonly yields not fo eafily to the fire as 

 fulphur does. 



Underneath, and behind this, there lies, lower 

 on the fides of the furnace, a floney, hard, heavy, 

 black matter, not properly to be clafied for its ar- 

 fenic, but rather, on account of its order of place. 

 Many a one might take it for a ilag, or fcoria, 

 than which it is nothing lefs, as appears upon 

 breaking it ; feeing it does not appear glaffy, 

 fmooth, and mining, as genuine flag does. Ex- 

 ternally this matter is often, as it were, glazed 

 over, but internally has a quite different appear- 

 ance, namely, that, notwithstanding its hardnefs, 

 which indeed, in refpecl of the abovementioned 

 calamy- furnace- fragment, is confiderable, yet it 

 may be ground fmall, fo as to become like a footy 

 duft to fmut the hands, which flag never does, 

 unlefs reduced, in the mofl careful manner, to the 

 finefl meal. Here and there, internally, it alio often 

 appears flaggy, and run ; nor can it be otherwife, 

 confidering the floney nature of the ores employed 

 in the crude-fmelting, and the fiercenefs of the 

 fire. This effete matter contains but little arfenic ; 

 but taking of what is glittering, and in texture 



often 



