J43 Intelligence and Miscellaneous Articles. 



has been examined by but one other chemist, Frick, in PoggendorfF's 

 * Annalen,' xxxi. p. 529. 



These analyses have given — 



1. By John :— 



Per cent. Atomic relations. 



Sulphur. 11-58 0-057 3 



Bismuth 43-20 0-032 2 



Lead 24-32 0-018 1 



Copper 12-10 0-031 2 



Nickel 1-58 



Tellurium 1-32 



Gold 0-79 



94-89 



2. By Frick :— 



Sulphur 16-61 0-0826 6 



Bismuth 36-45 0-0410 3 



Lead 36-05 0-0270 2 



Copper 10-59 0-0267 2 



99-70 

 The first analysis does not admit of any rational formula; but if 

 we consider the loss, more than 5 per cent., to be sulphur, we may 

 obtain by a little latitude, 



Cu2 S + PbS + Bi2 S», or 2 1 ^^^ \ + Bi^ S^, 



a formula analogous to that of the kobellite from Ilvena in Sweden, 

 analysed and named by Setterberg, and in which the electro-negative 

 atoms in the base are to the electro-negative atoms in the acid as 2 

 to 3. The following is its formula : — 



The second analysis yields also but an inexpressive and unsatis- 

 factory result. The formula, if such it can be termed, obtained 

 from it is — 



Cu« S + 2PbS + 3BiS, or otherwise Cu^ S, BiS + 2(PbS, BiS). 



I have now to enter into the details of a third analysis, executed 

 lately by myself, on a specimen kindly given to me by Colonel 

 Jackson, F.R.S., who brought it with him from Russia. The ore 

 was accompanied in the quartz by minute tufts of malachite, which, 

 together with the matrix, were carefully removed, by the aid of a 

 microscope, from the substance analysed. 



8-38 grs. of the mineral in powder were boiled in strong nitric 

 acid. 



A residue of 4-92 grs. of sulphate of lead remained, and 0-26 grs. 

 of sulphur. The 4-92 grs. of sulphate of lead (obtained, it should 

 be stated, after solution of the residue in potash and subsequent re- 

 conversion) = 3-36 grs. of lead and 0*52 of sulphur. 



Carbonate of ammonia in excess was then added to the clear so- 

 lution ; and after remaining for three hours at a gentle heat, it was 

 filtered from the precipitate, which (after being well-washed with 



