ANALYSTS OF IRON ORES, &C. 39 



y. Examinafiov of the pig iron of Dramhon^ 



Mr. Vauquelin having found oxide of manganese, chrome, P'g non of 

 phosphoric acid, and earths, in the scoriae of the refining 

 furnace, it was natural for him to infer, that he should find 

 the same substances in the pig iron ; since it is this, that 

 furnishes these scoriae, at least for the most part, in the 

 process of refining. Tl^ls fact was fully confirmed by ana- 

 lysis. 



He proceeded in the following vvay. Ten gram. [154"5 Analysed. 

 gvs.] of gray pig ivoii of Drainbon reduced to filings were 

 dissolved in sulphuric acid diluted with six parts of water. 

 The hidrogen gas evolved during the solution was collected. A. very fetid 

 It had an extremely fetid smell, very much resembling that *' *" * ' 

 of rotten garlic ; but still more that of phosphuretted hidro- 

 gen gas, though it had a certain pungency, which the phos- 

 phuretted hidrogen has not. The nature of this gas will be 

 noticed presently. 



The residuum was of a very deep black, and diffused an Residuum. 

 extremely strong smell of phosphorus. It weighed 53 

 cent. [8*2 grs.] or a little more than a twentieth of the iron 

 employed. 



The upper part of the bottle in which the solution was Oil formed. 

 made, and the tube through which the hidrogen had passed, 

 being so greasy that water would not adhere to them, Mr. 

 Vauquehn suspected, that oil had been formed ; a fact first 

 announced by Mr. Proust a few years ago on a similar oc- 

 casion, and vvhich Mr. Vauquelin adds he had himself ob- 

 served before that, v/hen dissolving certain kinds of tin. 



To know whether any of this oil remained in the resi- I^esiduum 

 duum of the pig iron dissolved in the sulphuric acid, ^1^110^3100110/ 

 boiled it with highly dephlegmated alcohol, and filtered the 

 liquor hot. 



This alcohol became milky on the addition of water ; and more oil ob- 

 being exposed to a gentle heat, drops of oil separated from 

 it as the alcohol evaporated. This oil was clear and trans- 

 parent ; it had a slight yellow tinge ; and its tasie was hot 

 and a little pungent, it appenved to be of a middle kind 

 between the volatile and fat oils. 



After 



