Mercury. 311 



matrix fliould firft be diflblved in nitrous 

 acid, and the cinnabar being difengaged 

 fhould be boiled in 8 or I o times its weight 

 of aqua regia, compofed of 3 parts nitrous 

 and i of marine acid ; the mercury may then 

 be precipitated from the folution in its run- 

 ning form by zinc. 



9. In the dry way the mercury is obtained 

 in its running form by diftilling the cinnabar 

 with -J- of its weight of filings of iron, or 

 even without iron, if the matrix of the cin- 

 nabar be calcareous. 



SPECIES V. 



Mineralized by Sulphur 'with Copper. 

 Black Ore of Mercury. 



i o. According to Cronfled and Linneus this 

 ore is of a blackifh grey colour, glafly tex- 

 ture, and decrepitates flrongly when heated ; 

 the cinnabar is volatilized, and the copper 

 remains, and may be diftinguiflied by the 

 Vifual tefts. 



SPECIES VI. 

 Pyritous Mercurial Ore. 



n. Mr. Monnet relates, that he found in 

 Daufhine a grey or whitifh friable fubftance, 



X 4 ioo 



