428 THE CANADIAN NATURALIST. [Vol. VIU. 



is distinguished by its minerals from the ordinary veins of Oe- 

 degarden, in as much as only its western part consists, as usual, 

 of phlogopite and apatite, whereas in the eastern portion the 

 phlogopite is replaced by hornblende. In contact with the 

 -country rock the hornblende is finely granular, but becomes 

 coarsely crystalline towards the centre of the vein which is occu- 

 pied by apatite. 



Hornblende occurs also in several other veins of Oedegarden, 

 sometimes replacing the phlogopite, and at other times accom- 

 panying it ; in the stringers raven-black and finely-granular, but 

 brown and coarsely crystalline in the veins. 



No. 6, which gave the best specimens of hydrous enstatite, 

 and No. 7 are both slightly-dipping veins of phlogopite, apatite 

 and enstatite, arranged in bands, as usual. 



In contact with the country rock the phlogopite is always in 

 fine scales and often speckled with small grains of apatite. The 

 individual scales are usually grouped without system ; but some- 

 times there can be observed traces of a parallel structure, whose 

 direction lies at an angle with the edges of the veins. Towards 

 the middle of the veins the phlogopite becomes always more 

 coarsely crystalline: we have seen plates at least half a foot 

 square. These are often crumpled, twisted and broken, and 

 sometimes are surrounded by apatite. 



No. 8 is an ordinary mica-vein, bearing apatite, and is visible 

 on the surface for a stretch of 60 feet. Where the vein wedges 

 out in its continuation towards the west there occurs a zone of 

 ■•'' sandrock" 86 feet long representing the vein, which still con- 

 tinues underground — as has been proved by pits. 



No. 9 has yielded the greatest quantity of apatite of all the 

 veins of Oedegarden up to the present time. It has been traced 

 300 feet in length, and 120 feet in depth ; its dip is 25° at the 

 surface, but lower down is 30°. Above ground the vein has alto- 

 o-ether disappeared for a length of more than 60 feet, whilst under- 

 ground the connection has been proved. Of all the veins this is 

 ,the most regular ; for the apatite, which occupies the middle of 

 ,the vein, and is separated from the country rock by a usually 

 ithin zone of phlogopite and hydrous enstatite, has occurred 

 partially in bunches, but generally in sheets. The thickness of 

 the vein has varied a good deal. 



A profile of the strike of this vein would closely resemble 

 those of the other veins of Oedegarden . 



