236 Intdligence and Miscellaneous Aiiicles. 



1st. A quantity of liydrosulpliuric acid gas is formed during the 

 action of sulphurous acid upon steel, which is not disengaged, but 

 is decomposed as soon as formed, by the sulphurous acid, which 

 causes the separation of sulphur. 



2nd. Liquid sulphurous acid, which has been digested for a suffi- 

 cient time upon steel, contains, besides the sulphite, a portion of 

 hyposulphite of protoxide of iron, and this solution, when neutral, 

 partially reduces the proto- and per-salts of mercury. 



3rd. Concentrated liquid sulphurous acid, digested in close ves- 

 sels with excess of steel, forms small crystals of a greenish white 

 colour, which are insoluble in water, and act like a hyposulphite of 

 iron with excess of base. 



4th. The residuum which is left when steel is treated in close 

 vessels with a sufficient quantity of sulphurous acid, is not pure car- 

 bon, but consists of carbon mixed, besides sulphur, with a basic hy- 

 posulphite of iron, which is difficultly soluble in sulphurous acid, 

 and which shows that that acid is unfitted for analysing steel or 

 iron. — VInstitut. 



ANALYSES AND CHARACTERS OF MINERALS, BY M. KUDER- 

 NATSCH AND COUNT SCHAFFGOTSCH. 



The analyses of which the results are given below were per- 

 formed in the private laboratory of Prof. H. Rose. 



Tin pyrites. Analysed by M. Jos. Kudernatsch. (From Pog- 

 gendorff's AnnaleUf Band xxxix. Stiick 9.) 



Sulphur 29-61' 



Tin 25-55 



Copper 29-93 



Iron 1244 



Zinc 1-77 



Earthy matter 1*02 



99-81 

 Tlie composition of this mineral may be represented by the 

 formula 



Tennantite. Analysed by M. Jos. Kudernatsch. (From Pog- 

 gendorfF's Annalen, Band xxxviii. Stiick 2.) 



Sulphur 27-76 



A rsenic 1 9*10 



Copper 48-94r 



Iron 3-57 



Silver a trace 



Quartz 008 



The probable formula for tennantite is 

 Fe'^ 1 



99-45 



