[ 121 3 



Nitrous acid difengages alfo the 

 phlogiflon from the iron, but does 

 not allow it to pafs in the air difen- 

 gaged from it, fp as to make it iiir 

 flammable. It feems to keep this 

 phlogiflon to itfelf ; for it is, after 

 the folution, no more to be found 

 in the diiTolved iron, when precipi- 

 tated in the form of ochre ; but the 

 fame fpirit of nitre, when difibl ving 

 iron in a very diluted ftate, leaves 

 the molt part of the phlogiflon with 

 £he metal, and rifes in the form of 

 partly fixed air, common air, and 

 what is called phlogifticated air, as 

 was faid above ; and by this method 

 iron may be reduced to the moft 

 impalpable powder, all obedient to 

 the magnet, which is a method of 

 making JEtbiops Martialis of great 

 importance for medical ufes, and 

 was difcovered by an apothecary of 



Paris, 



