ANALYSIS OF MAGNETIC IRON-ORE, 57 



perfectly so : magnetic iron-ore being so in a great 

 degree, since the substance distinguished by the 

 name of magnet belongs to it, is most probably 

 composed chiefly of protoxide of iron. This, at 

 least, is more likely, than that it should be a mix- 

 ture of metallic iron, and black oxide of iron, 

 the only other supposition which it is possible to 

 form. 



