in the Pyrites. 135 



which I mean what is there called copper-ore, or 

 the pyrites rich in copper) poffefs Julpbur in fuch 

 plenty and proportion, as might almoft make it 

 looked upon, not as an incidental, but as an effen- 

 tial, constituent part thereof; and this fo conftant- 

 ly, that let a copper -pyrites -ore be ever fo arfeni- 

 cal, it is never without fulpbur* And here the 

 following remark may properly be made, namely, 

 that iron- pyrites, fo far as the white-pyrites^ on ac- 

 count of its very fmall portion of iron, may be 

 called fuch, may fooner exiil without julpbur than 

 copper-pyrites. 



In genuine won- pyrites, containing the lead, or 

 no copper at all, the julpbur \ in general, amounts 

 to between £ and f of the whole. To mention only 

 the principal forts ; that from Ehrne-Schlange gives 

 28 pounds of crude fulpbur the centner, or quin- 

 tal ; from PretzfchendorfT, 30 lb. 24 loths \ from 

 the Rautencrantz, at Johan-Georgen Stadt, 30 lb. 

 24 /. from the Halfebrucke, 36 lb. 1 61. from Braunf- 

 dorff, 25 lb. 16 1. from the Sch Ioisberg, ax Top- 

 litz, 27 lb. 16/. from Almerode of HelTe, 2 61b. ill. 

 from Alt fattel, near Egra in Bohemia, 26 lb. 16/. 

 from Boll, in the territory of Wirtembcrg, 26 lb. 

 the Jhiver kidney $ of Go(lar 3# 2 4 lb. the Swedifh py- 

 rites of Nericia, 25 lb. the pyrites-kidneys from the 

 falt-pit at Vilizka, 26 lb. the pyrites from the Ban- 

 nat of Temefwaer, 27 lb. 10/. the pyrites from 

 the three Wifemen's Levels at Schemnitz in Hun- 

 gary, 23 lb. 



And here we are to remark, (i.) That in clofe vef- 

 fels, as retorts, the above affigned proportions of crude 

 fulpbur zxe with difficulty, and commonly fcarce 

 to one fourth procurable ; but an open fire, fuch 

 as is that under the muffle, fully forces out what 



K 4 remains 



