236 Elements of Mineralogy. 



12. In the dry way, Mr. Bergman eflfays 

 thefe ores, by mixing 2 parts of the ore, well 

 pounded and wafhed, with one and a half of 

 litharge, and 3 of glafs, covering the whole 

 with common fait, and melting it in a fmith's 

 forge, in a covered crucible ;~ he then opens 

 the crucible, puts a nail into it, covers it, and 

 heats it again, and continues to do fo until 

 the iron is no longer attacked. The lead is 

 thus precipitated, and contains the gold which 

 is feperated by cuppellation, Scheff. 239. i An- 

 merk. 



SPECIES HI. 



Mixed 'with Arfenical Pyrites'. 



1 3. Found at Salzbergh in Tyrole, in moun- 

 tains of quartz and fhiftus; the quintal affords 

 only about 25 grains. It is feparated by 

 lotion, and affords a profit of between 4 and 

 foe/, per an. 2 Jars. 78. 



SPECIES IV. 



Mixed 'with a white, red, or Vitreous Silver 

 Ore. 



1 4. Near Cremnitz and Scb&ttnifz in Hun- 

 gary, 2 Jars. 165, 195. 



SPECIES 



