Phenomena of Gr anile Veins. 489 



(26) Granite Veins in Granite ; Southampton. 



No. 27 shows a granite vein of a little more than a foot in width, 

 crossing strata of gneiss obliquely. After this vein was injected, the 

 strata of gneiss seem to have slidden down so as to cut off the 

 vein in at least two places, and near those spots the vein is considera- 

 bly reduced in size, as if in a plastic state when the disturbance took 

 place in the gneiss. 



(27) Granite Vein in Gneiss ; Shutcsbury. 



The five next cases viz. 28, 29, 30, 31, and 32, were sketched in 

 New Bedford and Fairhaven : all but Nos. 29, and 31 on Palmer's 

 Island, in New Bedford Harbour. They all occur in gneiss. No. 

 28 is interesting chiefly on account of the peculiar form of the vein, 

 which varies in width from two feet down to six inches. It exhibits 

 the vein as it appears on the basset edges of the gneiss where the 

 strata dip to the north about 35°. 



62 



