322 Intdligence and Miscellaneous Articles, 



coal it yielded white fumes, which strongly affected the eyes. 

 Sulphuric acid decomposes it, and converts it into iodoform. This 

 process is equally applicable for procuring broraal and chloral, which 

 may be readily obtained bv heating the solutions — V Institute Feb. 

 1st, 1837. 



ON THE OXIBROMIDES AND SOME OTHER COMPOUNDS OF 

 TUNGSTEN. 



M. Bonnet states that he has obtained two oxibromides of tung- 

 sten by passing the vapour of bromine over tungstic acid mixed 

 with charcoal and strongly heated. At a red heat, with a moderate 

 current of bromine, an oxibromide was obtained, which yielded 



Oxygen 603 



Bromine 48-00 



Tungsten 45-97 100* 



The composition of which gives W^ 0% W^ Br'o, which is equiva- 

 lent to an atom of blue oxide of tungsten and one atom of bromine. 

 At a higher temperature than in the preceding case, and with the 

 bromine passing more rapidly, a second oxibromide of tungsten was 

 procured, which yielded 



Oxygen 30 



Bromine 60* 



Tungsten 37' 100- 



The formula of which is W O^ W^ Br'-, which is equivalent to 

 an atom of tungstic acid with 2 atoms of perbromide of tungsten, 

 and which ought to be called tungstate of perbromide of tungsten. 



Passing chlorine over the same mixture, instead of bromine, an 

 oxichloride of tungsten was obtained, corresponding to the tungstate 

 of perbromide of tungsten j this tungstate of perchloride of tung- 

 sten yielded 



Oxygen 4*8 



Chlorine 40-0 



Tungsten 55-2 100- 



This composition corresponds with the formula WO^, W^ Ch'», 

 tungstate of perchloride of tungsten. 



The tungstates of perbromide and perchloride of tungsten act 

 upon water as indicated by their composition, but the case is not 

 the same with the oxibromide W- O', W^ Br'". The analysis of 

 these compounds was very difficult to perform. — Vlnstitut, Feb. 8, 

 1837. 



ON CHLOROFORM AND CYANOFORM. 



M. Bonnet obtained with great facility a large quantity of chloro- 

 form by heating chloride of lime and acetate of lime in an earthen 

 retort. It is purified by precipitating the liquor with water, then 

 distilling the lower stratum of the liquid, which is chloroform, from 

 chloride of calcium. 



Prussian blue or cyanide of mercury was substituted for chloride 

 of lime, and a liquid was obtained which M. Bonnet supposed to be 



