358 Scientific Intelligence. 



as the cerite from Bastnaes in Sweden. — {Notice of Sir Alexander Crick* 

 ton' 8 Cabinet, p. 22.) 



29. Analysis of Zinkenite and Jamesonite. — Professor Henry Rose of 

 Berlin gives the results of one analysis of Zinkenite, and three of Jameson- 

 ite, as follows : 



Zinkenite. Jaraesonite. 



Sulphur, 



Lead, 



Lead, containing traces of 



zinc and iron, 

 Copper, 



Iron, - - - 

 Antimony, 



The material of the Zinkenite was communicated to him by Professor Gus- 

 tavus Rose, who described the species ; with the specimens of Jamesonite, 

 first described by Mr Mohs, he was furnished by Mr Haidinger. Pro- 

 fessor Henry Rose considers the first to be a compound of one atom of 

 sulphuret of lead, and two atoms of sulphuret of antimony, expressed by 

 the formula Pb S 2 + 2 SbS^, while the second is a compound of three 

 atoms of the sulphuret of lead, and four of the sulphuret of antimony, the 

 formula being 3 Pb S 2 + 4 SbS 3 . The contents of iron, zinc, and copper, 

 he considers accidental, there being no example of iron and lead forming 

 ingredients of the same chemical mixture, neither as oxides nor as sulphu- 

 rets. Professor Rose did not find sulphuret of lead in any of those grey 

 copper ores which contained sulphuret of iron, even though they were im- 

 bedded in lead-glance. The analysis of the two species, mentioned above, 

 form part of an extensive series of analytical researches on the minerals 

 usually named Fahlerz, or Grey Copper, with which Professor Henry Rose 

 has been occupied for several years past. An account of them is in a con- 

 siderable state of forwardness for publication. — (Poggendorf s Annalen der 

 Physik.) 



30. Professor Mohs. — We feel particular gratification in announcing to 

 our readers, the appointment of Professor Mohs to a mineralogical chair at 

 Vienna. The chair has been established for the occasion in consequence 

 of the peculiar interest evinced by the present Emperor of Austria for 

 promoting the useful sciences. In order to render the lectures more ef- 

 fectual, the professor has been entrusted with the care of arranging sys- 

 tematically the Imperial cabinet, and to adapt it, at the same time, to the 

 purpose of lecturing. For many years every occasion was seized, and con- 

 siderable sums expended to enrich this collection. Under the management 

 of Professor Mohs, it now bids fair to become an ample source of minera- 

 logical information. 



31. Pyrochhre, a New Mineral Species.— Jts forms belong to the tes« 



