8 THE CANADIAN NATURALIST. [Feb- 



Green amygdaloid vein 19 feet. 



Trap 98 « 



Albany and Boston vein 7 H 



Trap 45 " 



Epidote or Mesnard vein 23 " 



Trap 20 " 



Fluckan 1 " 



Conglomerate 31 " 



Sandstone 6 " 



506 feet. 

 The general strike of these strata is N. 38° E. and the dip 55° 

 northwestward. The two beds above denominated as the Green 

 amygdaloid vein and the Mesnard vein are also found on the 

 Quincy property, where the first named bears a general resem- 

 blance to the rock of the Pewabic lode. The matrix is perhaps 

 darker coloured, and contains grains and crystals of feldspar as 

 well as amygdules of green-earth and calcspar, the latter containing 

 copper in fine grains. The rock of the Mesnard vein is dark 

 brown, with a bluish tint. The minerals of the amygdules are 

 principally green-earth, quartz and metallic copper. This bed is 

 also called the Epidote vein but the green-earth has probably 

 been mistaken for epidote. 



The trap which overlies the conglomerate in the Albany and 

 Boston Mine is a fine grained mixture of dark green delessite, 

 (in grains less distinctly isolated than in the rocks already des- 

 cribed) greenish-grey feldspar, and reddish-brown mica, some of 

 the laminae of the latter shewing ruby-red reflections. Its sp. gr. 

 is 2.81, and the smallest trace only of its powder is attracted by 

 the magnet. The colour of the powder is greenish-grey, which 

 changes on ignition to brown, a loss of 4.19 being sustained. 

 Nitric acid dissolves from it 24 . 52 p. c, which consist of 



Alumina 5.96 



Peroxide of iron 14.78 



Lime 3.41 



Magnesia 0.37 



These figures agree pretty closely with the quantities of bases 

 dissolved from the rocks already described, but the quantities of 

 lime and magnesia are a little smaller. The residue consists of a 

 dark coloured, heavier, and a reddish-white coloured lighter part, 

 the latter about twice as large in quantity as the former. The 



