Phenomena of Granite Veins. 



497 



No. 40 is in the same town. a-, a, is a granite vein cor- 

 responding nearly in direction with the layers of mica slate; the two 

 parts of which are separated by mica slate several feet and one extrem- 

 ity is not as wide as the other. The two parts arealso shifted later 

 ally by the two fissures b, b. I confess myself unable to give any 

 satisfactory solution of the anomalies of this case. 



I 



(40) Granite Vein in Mica Slate ; Conway. 



No. 41 was sketched from a bowlder in Conway, merely on ac- 

 count of the peculiar form of the granite vein which traverses mica 

 slate. The widest part of the vein is only an inch across, and this 

 is reduced to half an inch at the other extremity. I neglected to 

 sketch the direction in which the layers of slate run. 



(41) Granite Vein in M. Slate ; Conway. 



No. 42 appears to be an example of the mechanical effects upon the 



layers of mica slate, of a protruding vein of granite. It occurs at 



Narrymore's quarry in the west part of Goshen ; where the layers of 



rnica slate are arranged with remarkable regularity. The dip there 



63 



