492 



Scientific Geology. 



foot. It will be seen that the general dip of the strata is 35o; and 

 that this is increased to 40 on the lower side of the vein. This is 

 one of those cases which would be apppealed to in proof that veins 

 were filled from above. The disturbance of the strata, however, 

 proves that it was not filled by crystalization from aqueous solution. 

 The lower edge of the section coresponds to high water mark. The 

 spot can be well examined only in a boat. 



(32) Granite Vein in Gneiss : Palmers Island N. Bedford Harbor. 



No. 33 was sketched from a bowlder of gneiss in the south part of 

 Tolland. It is traversed by a vein of granite a foot wide. The only 

 object is to show the change in the direction of the strata on different 

 sides of the vein. 



(33) Granite Vein in Gneiss ; Tolland. 



For No. 34, taken in the northeast part of Williamsburg, I am in- 

 debted to Mr. Alanson Nash, a, a, appears to be the oldest vein of 

 granite in mica slate ; and is only two inches wide : b, b, is a second 

 vein; as is proved by its cutting through a, a, and is of the same 



