On Metallic Minerals. 369 



hand shore of Crow or Marmora lake, near to the entrance 

 into it from the works, and a (ew hundred yards back in 

 woods. There have been deposited two species of ores — 

 the magnetic oxide, and the argilUiceous oxide, (bog ore.) 

 The principal spot where the magnetic oxide of iron 

 comes to day, a term en)ploycd by miners, to express its 

 appearing on the surface, is on the summit of a hill. Here 

 it may be seen forming a bed of about twenty feet long, by 

 about three or four feet wide. Whether the rock be a true 

 greenstone, in a geological sense, or not, I cannot deter- 

 mine, as it appears to be rather coloured by epidote than 

 hornblende; it is, however, very tough, compact, and 

 possesses no appearances of stratification. This bed of ore 

 has a position nearly due north and south, as regards its 

 longitudinal direction, and a moderate dip to the north. — 

 The walls of the bed appear to be vertical, and may proba- 

 bly sink to the level of the base of the hill, as fixed masses 

 of the same ore, in the direction of this bed are found there, 

 according to Mr. Manahan. This ore belongs to that 

 sub species of the magnetic oxide, called native magnet, 

 as it possesses not only strong attractive magnetism, but as 

 strong a repulsive one also ; and it is worthy of remark 

 that in this instance, as in some others which have been 

 noticed by other individuals, the position of the poles in the 

 ore, corresponds with that of the bed ; thus I invariably 

 found, after trying llie experiment repeatedly, that that 

 portion of a fragment which had a northern position in the 

 mass before it was removed, relatively to the opjmsite 

 portion, attracted the south pole of the magnet, and rejiclU-d 

 the north, while the opposite portion possessed an influ- 

 ence upon the magnet, directly the reverse. 



