32 ANALYSIS OF IRON ORES, &:C. 



ceived to be furnished by the nitric acid; but if ttiis be ad- 

 mitted (and I have no doubt from experience, that the nitric 

 acid actually does coinmunicute oxi^en), it is ;lifficult to 

 see how the constituents of oxalic acid could be deter- 

 mined by any such decomposition, unless the quantity of 

 oxigen furnished by the nitric acid were accurately ascer- 

 tained. 



(To he conchtded in our next.) 



V. 



Anah/sls of some Iron Ores in Bu7\!r?tvdi/ and Franche- 

 Comte, to vfiick is added, an Examination of the Pig 

 Iron, Bar Iron, and Scoria', produced from them. By 

 Mr. Vauquelin*. 



Ores, iron, SCO- IVJlR. Vauquelin, in the year 1805, haviiio- visited various 



ris, and fluxes, . i • t» j " n a_ i i 



coiiectf,d for ''^^'^ works m burgundy, collected several specunens of 



examination, ores, pig iron, bar iron, scoriae, and fluxes, for the purpose 

 of subjecting them to chemical analysis, in order to ascer- 

 tain, whether it were possible to know from a comparison 

 of their composition, what takes place in the processes, to 

 •which iro^i ores and cast iron are subjected. We shall give 

 here the leading results of this able chemist's labours, and 

 the particulars of some of the processes he employed to ob- 

 tain these results. 



I. Chemical examination of some fiuor spars. 



Fluor spar em- "^^^ ^P^^" employed as a flux at the mine of Drambon, in 



ployed as aflux the department of Cote-d'Or, is of a yellovyish white, and 



at Drambon. toleitibiy hard. It dissolves with effervescence in nitric 



acid, and leaves a yellowish residuum, amounting to about 



a fifth of its weight, which is composed chiefly of fine 



* Journal des Mines, No. 119, p. S82. The whole of the paper, 

 of which this an abridgment, will be found in the Memoirs of the Na- 

 tional Institute. 



sand. 



