340 On Metallic Minerals. 



island ; on an island in the eastern part of Neepigon Bay, 

 Lake Superior ; and at Becketts Mills, Short Hills, Niagara 

 district, and in the township of Elizabeth. 



No copperas works have yet been established ; but in the 

 United States there are several, and one at Strafford in New 

 Jersey is said to have yielded three tons of copperas in 

 two days. 



Sulphur is sometimes extracted from iron pyrites by 

 sublimation. 



Iron pyrites has been often mistaken for an ore of gold. 

 Its superior hardness and unmalleable character will distin- 

 guish them. It is true that the former does sometimes 

 contain gold, but never, I believe, in sufficient quantity to 

 render its extraction profitable. 



The sulphuret of iron is found in all formations from the 

 oldest to the newest, but the magnetic variety or proto 

 sulphuret occurs only among rocks of the primary order. 



GRAPHITE. CARBUBKT OF IRON. PLUMBAGO. 



This, as has been said, is more usually classed with 

 combustible minerals, but from its chemical name and 

 from its being found in some abundance it is here introduced 

 as a metallic one. 



According to reports there is a large supply of this 

 mineral in the township of Houghborough, also at Hull on 

 the Ottawa, where it is mixed up very plentifully with 

 magnetic iron. Between these two places it occurs fre- 

 quently disseminated through many rocks and minerals. — 

 The names of plumbago and black lead, which are so 

 frequently given to this substance, encourage an erroneous 

 opinion to prevail that it is an ore of lead, with which it 

 scarcely possesses one character in conmion. Carbon and 



