m 



[ArfALYSIS OF IRON ORES, &C. 



VI. ExarrAnadon of the bar iron of Dramhon and Peames,. 



Colt! short iron Mr. Vauqnelin dissolved 5 gram. [77*2 grs.] of cold short 

 ""^^^ • iron of D'-arabon in sulphuric acid diluted with five parts of 



Hidiogen gas. water. He collected the hidrogen gas, that was evolved of 

 during the dissolution, and found it to have exactly the 

 same smell as that of the gas from the pig iron, but not 

 quite so powerful. 

 Jtesidirtim. The Tesiduum left by these 5 gram, was much less co- 



pious than that of the pig iron, and appeared likewise nnt to 

 be of so deep a black. While it was wet it emitted a vety 

 strong fetid smell, analogous to that of hidrogen gas. It 

 weighed 1.5 cent. [2*3 grs.], amounting to 3 per cent. The 

 solution of the iron had the sau>e smell, which was not dis- 

 sipated but by evapo-wtion. 

 Thiosphorus. A few particles of this residuum, thrown on a burning 

 coal, emitted a white vapour, with a SHiell resembling that 

 of arsenic and phosphorus. Heated red hoi in a silver cru- 

 cible, it burned>^with flame, and left beiiiud a yellowish 

 powder. This was mixed with a little caustic potash, cal- 

 cined, and lixiviated. The liquor being filtered, saturated 

 with nitric acid, and subjected for a few minutes to heat, 

 limewater was added, which threw down a white flocculeiit 

 precipitate, consisting chiefly of phosphate of lime, but 

 with an atom of silex and perhaps of alumine. 



It is certain from these experiments, which Mr. Vauque- 



lin repeated several times, that the iron of Drambon, 



though it is considered as of pretty good quality, contains 



very perceptible traces of phosphorus. He likewise found 



some slight traces of it in the solution by sulphuric acid. 



IronofPesmPs The iron of Pesmes atibrded nearly the same results. 



of better quali- The residuum however was less by one half, amounting only 



^* to 1| per cent; and it contained less phosphorus. This 



iron is very tough, and is reckoned one of the best in 



Franche-Comte. 



VII. Of the hidrogen gas. 



The fetid hi- Various experiments, which Mr. Vauquelin made by the 

 drogen gas. ]^elp of oxigenized muriatic acid on the hidrogen gas evolved 



ftom 



