241 



3. It Is often diffufed through fandr 

 hd ochre, alfo in grey lime-ftone in Lower 

 Aujtria^ and in a greenifh clay near Schem-* 

 nitz, or miked with ochre, clay and cakiforra. 

 faickel. 



4. It is feldom found pure* being gene- 

 tally alloyed with copper, and fometimes 

 with a fmall proportion of gold, iron, or re- 

 gulus of antimony *, and fometimes about 5 

 percent, of arfenicf ; it is f-parable from 

 gold and regulus of antimony by folution in 

 nitrous acid, and from copper and iron by 

 precipitating it by the marine acid , an4 

 from arfenic by torrefaftion. 



100 gr. of the horn filver contain 75 of 

 real filver ; it is reducible by triturating it 

 with about its own weight of fixed alkali 

 with a little watery then melting the whole in 

 a crucible, whofe bottom is covered with mi- 

 neral alkali well prefled, and covering the 

 mafs of horn filver alfo with the mineral 

 alkali. 



5. The native filver found near Konigfoerg 

 contains fo much gold as to acquire a yellow 

 colour from it, 



. i 



* Bergm. Sciag. ,154. [ 13 Roz, Supplem.ip. 56. 

 t A more perfect manner of feparating it from copper 

 toill befeen N- 21* 



R SPECIES II. 



