Intelligence arid Miscellaneous Articles. 477 



M. Ebelman determined the state of oxidation of the uranium in 

 pechblende, by a modification of a process which he has described in 

 the sixteenth volume of the Annates des Mines, and the results of his 

 analyses are — 



Black oxide of uranium 75*23 



Sulphuret of lead 4*82 



Protoxide of iron 3*10 



Protoxide of manganese 0*82 



Silica 3-48 



Lime 524 



Magnesia 2*07 



Soda 0-25 



Carbonic acid 3*32 



Water 185 



100-18 

 Ann. de Ch. et de Phys., Aout 1843. 



ON THE COMPOSITION OF WOLFRAM. BY M. EBELMAN. 



Until lately wolfram has been considered as a compound of tung- 

 stic acid with the protoxides of iron and manganese ; but recently, 

 M. Schaffgotsch {Ann. de Ch. et dePhys. ii. p. 532) has stated that it 

 contains the oxide of tungsten and not the acid. He has deduced this 

 from the results of his analyses, which all gave an excess of five or 

 six hundredths when the tungsten was estimated as tungstic acid. 

 M. Wohler arrived at the same conclusion from the action of chlorine 

 on wolfram. 



M. Ebelman remarks, that an experiment which is easy of execu- 

 tion appeared to him to be sufficient to decide the question : wolfram 

 is acted upon by hydrochloric acid when boiling, and leaves a residue 

 which is evidently tungstic acid. 



The mean of five experiments on wolfram from the environs of 

 Limoges gave the following results : — 



Tungstic acid 76*20 



Protoxide of iron 19*19 



Protoxide of manganese 4*48 



Magnesia 0*80 



100*67 

 The mean of two experiments made upon fragments of a large 

 crystal of wolfram from Zinnwald, gave 



Tungstic acid 75*99 



Protoxide of iron 9*62 



Protoxide of manganese 13*96 



Lime 0-48 



100*05 

 Ann. de Ch. et de Phys., Aout 1843. 



ON THE PRODUCTS OF THE DECOMPOSITION OF AMBER BY 

 HEAT. BY MM. PELLETIER AND PHILIPPE WALTER. 



The authors remark, that the phsenomena of the distillation of 

 amber have been observed with the greatest attention by MM. Robi- 



