COLLECTION OF MINERALS. 3o3 



the stage is a considerable mass of sulphuret of 

 silver from Bohemia, and, below the same stage, 

 a beautiful group of crystals of antimoniated sul- 

 phuret of silver. 



Mercury rarely presents itself in its native state 

 or as quicksilver, such as we see it in the thirty- 

 eighth case. It is more commonly found in the 

 state of cinnabar, or in combination with sulphur. 

 The thirty-ninth case contains an interesting se- 

 ries of specimens of sulphuret of mercury from 

 the famous mines of Almaden in Spain, and Idria 

 in the Frioul. 



(Fortieth case.) Lead is one of those metals 

 which present themselves in the most varied 

 combinations of form and colour. We should 

 particularly remark the beautiful groups of cubic 

 crystals, which belong to sulphuret of lead or 

 galena, which were given to the Museum by 

 M. Heuland. In the following case, under a glass, 

 is a rare variety of carbonate of lead in acicular 

 crystals of a dazzling white. In the forty-second 

 case are several specimens of lamelliform molyb- 

 date of lead, from Bleiberg in Carinthia, and green 

 phosphate of lead, from Brisgaw. 



After having glanced at the specimens of the 

 nickel ore, a metal which is of no use in the arts, 

 let us pause before the two cases in which are 

 the different varieties of copper. We should 



