On Metallic Minerals. 337 



an abundance of ore of a good quality in the neighbourhood, 

 which I cannot, however, take upon myself to say there is, 

 it well deserves! the notice of government, or that of some 

 monied company or individual. I have been informed that 

 with very little expense, the river might be rendered 

 navigable from the head of these falls to the Rideau. 



BROWN OXIDE OF IRON. 



I have not seen any other variety of this species than the 

 ochrey or yellow ochre and umber. The first is, like the 

 red ochre, found always associated with other ores of iron, 

 from which, like rust from malleable iron, they seem to 

 have had their origin. As a stain upon rocks the two 

 oxides are often seen here as elsewhere. There appears, 

 however, to be an independent bed of it at St, Augustin, 

 Lake Calvaire, L. C. and in the parish of I'Ancienne 

 Lorctte. — (see 1st vol. Transactions, p. 44.) 



Captain Bayfield noticed " brown iron ore crystallized 

 and otherwise," on the islets of Gargantua, Luke Superior. 



Umber, which is a variety of this species, is so named 

 from the circumstance of its having been first noticed in 

 the dutchy of Spoletto, anciently called Umbria. It has 

 been found at Beauport, near Quebec, on land belonging 

 to Sheriff Sewell. 



Umber has been sometimes classed with earthy minerals 

 very erroneous!), I think, as it contains 48 per cent, of 

 iron, and 20 per cent, of manganese. Its use as a pigment 

 is well known, and for that purpose it is brought princi- 

 pally from the Isle of Cyprus, where it occurs in beds. 



AHCILLACKOUS OXIDK OK lUON. 



The argillaceous oxide of iron, which is next in abun •• 

 dauce in thib country to the magnetic oxide, and from 



