Silver. 255 



alkali, which will take up the horn filver, 

 and leave the vitreous ore. The iron, if 

 any, fhould be precipitated from the firft 

 folution, by the P ruffian alkali, after the pre- 

 cipitation of the barofelenite. 



Uncertain Mineralizations. 



SPECIES XVI. 

 Goofe-dung Ore. 



33. This is of a greenifli colour, mixed 

 with yellow and red ; it is faid to contain 

 about 6 per cent of lilver. Some think it a 

 mixture of red filver ore, and calx of nickel, 



SPECIES XVII. 



Fotiaceous Silver Ore. Silberartrges, Berg- 

 zunder, Blatter erz. 



34. Its colour is mortdore. It is thought by 

 fome to be native filver, by others a mixture 

 of galena, ochre, and filver, it is found in 

 mountain cork, it is fo light, that it fwims on 

 water. It contains but one ounce of filver 

 per quintal. See Lehman's Experiments, 



Berl 1758, 



SPECIES XVIIL 



