3& 



Manganese, 

 alu mini, and 

 lime. 



Component 

 parts of the 

 scori*. 



All these were 

 in the pig iron. 



ANALYSIS OF IRON ORES, &C. 



ammonia, and added to the filtered solution oxalate of am- 

 monia, which formed in it a pretty copious precipitate, that 

 •was oxalate of lime. 



The iron, while still morst and in an attenuated state, 

 was treated with acetous acid, the mixture evaporated to 

 dryness, and the residuum redissolved in water. In the 

 clear and colourless liquor were detected by different means 

 the presence of oxide of mans^anese, and of alufnine, 

 which had escaped the action of the alkali in the first ope- 

 ration, and of a pretty large quantity of lime, which the 

 volatile alkali had precipitated* with the help of the oxide of 

 iron. 



From these experiments, and the results they furnished, 

 it is evident, that the dross or scoriae of the refining furnace, 

 on which they were made, are formed of, 1st, a large quan- 

 tity of iron oxlded at a minimum ; 2d, oxide of manganese ; 

 3d, phosphate of iron; 4th, chrome, probably in the state 

 of oxide; 5th, silex ; 6th, alumine; 7th, lime, part of 

 which is perhaps combined with phosphoric acid. 



It can scarcely be doubted, that all these matters were 

 contained, at least in part, in the pig iron that furnished 

 the scoriae : the charcoal might have imparted to them at 

 most some lime, silex, and manganese; l>ut the analysis of 

 the ores, and of the pig iron itself, will soon instruct us what ' 

 we ought to think on this point. 



Ores examin- 

 ed. 



Bog ores of 

 Drambon, 



III. Examination of the bog ores. 



The ores subjected to analysis by Mr. Vauquelin were, 

 Ist, those employed at the forge of Drambon. These are 

 in spherical nodules of different sizes, and some irregi^lar 

 fragments of limestone are observed among them. 2d, 

 Chamfont,and those of Chamfont and Grosbois. These much resemble 

 the former. Those of Grosbois contain a pretty large quan- 

 tity of limestone. 3d, that of Chatillon-sur-Seine. This 

 is of an ochry yellow colour, in grains as small as millet 

 seed, and no limestone is seen among it, but it contains a 

 pretty large quantity of clay. 



Mr. Vauquelin gives at large his analysis of the ore of 



Grosbois. 



principles, though in different proportions; at the same 



time 



