\ 



On Metallic Minerals. 341 



iron are alone its constituents, the former at the rate of 

 from 91 to 96 per cent. 



Besides its other well known uses, graphite has been 

 lately employed to diminish the friction of wheel work, &c. 



ORES OF MANGANESE. 



In the state of an oxide, manganese is almost as univer- 

 sally distributed over the globe as iron, though mines of 

 the former are much more rare than those of the latter. — 

 It exists in variable proportions in the garnet, schorl, 

 epidote, augite, &c. &c. but particularly in the brown and 

 sparry iron ores; also in bog ore. In this country it has 

 not been frequently noticed, and only, as I am aware, in 

 the lower province; but I believe that it has been often 

 overlooked, as it is not |)robable that it will be found to be 

 rare in a country abounding so much in iron, its constant 

 associate elsewhere. 



EARTHY OXfDB OF MANGAXESK, — WAD 



One sub species of the earthy oxide only, has been 

 observed, that provincially named wad. It occurs, as bog 

 ore often does, on the banks of a small stream, and is 

 evidently a recent alluvial formation. — (Xote /•) 



The oxide of manganese, is more frequently found in 

 primary and transition rocks, than in secondary, but the 

 earthy variety is probably forming daily. 



ORES OF SILVER. 



Reports have been received frecjuently respecting the 

 diHcovrry of silver ores, but 1 believe them all to have 

 been erroneous. Silver, indeed, has l)een found in the 

 galena from St. Paul's Bay in sulTuiiiit (piantity, as it is 

 •aid, to be worth txiracting ; but admitting iliis fo be llie 



