( 4*0 ) 



too Parts. Tin. 



Black tin ore 80 tin, fome iron. 

 Red ditto more of iron than of tin. 

 Sulphurated tin 40 per cent, fulphur, a little 

 copper, the remainder tin. 



100 Parts. Lead. 



White lead ore a little iron, argill or calca- 

 reous earth, 80 to go of tin. 



Red ditto more iron, argill, 80 or 90 of 

 lead. 



Green ditto ftill more iron, feldom copper. 



Bluifh ditto a little copper. 



Vitriol of ditto about 70 of lead. 



Galena from 15 to 25 of fulphur, from 

 0,0 1 to 1,5 or 2 of filver, from 60 to 85 

 of lead, befides quartz and iron. 



Antimonial lead ore antimony, from 0,08 to 

 0,16 filver, and from 40 to 50 of lead. 



Pyritous lead ore pyrites, 18 to 20 of 

 lead. 



Red leadfpar realgar, a little filver, and 43 

 of lead. 



100 



