^6 ANALYSIS OP IRON ORES, &C. 



solution being evaporated to dryness left a blackish matter, 

 . • wiiich gave a very tine green colour to borax. 



Oij r^^atiiig- afterward witii sulpbuiic acid, and precipi- 

 tating by liiuewuter, Mr* Vauquelin obtaiiied 1-5 percent 



Magnesia of inagiusiii. Though this earth was found in the pig iron 



from each of the tive bog ores, he does uoi: venture to as- 

 sert, that it exists in all : but he observes he has much jnore 

 reaaou to think, that chrome and phosphoric acid are con* 

 stantiy louad in it. 



Similarity cf Kefleciing, that oxide of manganese, chrome, and mag- 



the^eorcsto u^sia,- which he had just obtained, were found hkewise in 



meteoric . J ' 



stouts: aeroiiles, or meteoric stones, he questioned whether it were 



not possible for iron ores, to have contribuied in some way 

 or oilier to the formation of these stones. This idea led him 

 but no nickel to exafni..e, whether nickel likewise did not occur in bog 

 in thein. ores; but his lesearches vv'ere fruitless. 



Component Froin what has been said it follows, that the bog ores ana- 



parts ot the lysed were composed of, Ibt, iron; 2d, manganese: 3d, 

 bog oies. •' , ^ 



phosphoric acid ; 4th, chrome; 5th, magnes,ia; Gth, si Tex ; 



7th, alumine; and Sth, lime. The chrome, phosphoric 

 acid, and magnesia, had not before been noticed in these 

 ores. 



IV. Examination of the iron, that siiL'imes and collects in the 

 chimneys of the refining furnace. 



Iron sublimed This iron is found adhering to the sides of the chimneys 



into thechim- ^ ^^^^ refining furnace in the shape of stalactites, which are 

 neysof thelur- _ ^ _ ' ' _ ^ 



naces, sometimes more than a foot long and three or four inches \x\ 



diameter. They are formed of agglutinated grains, red ill 

 ^ their fracture, leaving great intervals between them, an4 



having but a slight action on the magnet. 



We shall not give the particulars of IV^r. Vauquelin's ana- 

 lysis, but he concludes it with the follov/ing words. 

 contains o-AiAe " In this sublimed iron then, there are oxide of ftianga- 



'it '^^^"J-'^"'!f^' nese, siVex, phosphoric acid, and above all a great deal of 



£i! X, nos ho- V "^ . - ° _ 



lie <icid,- and chrome. These matters therefore have been volatilised by 



much chrome, ^i^^ p.jioric, either by bdng dissolved in this fluid, or by 



yielding to the impulse of the current of air; but in either 



case they have issued from the pig iron, during the process 



of refining." 



V. 



