Mineralogy and Geology of the White Moimtains. 113 



Fig. 4. 



No. 2, one quarter of a mile east of the former, crosses the bed 

 of Bear Camp river at right angles ; course N. by E. ; one to two 

 feet wide ; inclines down stream at an angle of 40° or 50°, and 

 curves up stream like a bow ; is itself crossed in the middle of the 

 stream by a narrow granite fault or vein ; on the lower side in 

 several places, the granite, from its greater softness has been re- 

 moved by the water and the dike, being left prominent, presents 

 the appearance of a dam. This exposes, on the side of the dike, 

 a series of longitudinal light and dark gray stripes, never over two 

 inches wide, arranged horizontally in regular alternations.* The 

 river bed above, as well as below this dike, is filled with trap ruins. 



Dikes in Eaton. 



On the hill, near Mr. Eleazar Snail's, one quarter of a mile east 

 of the village, are two dikes from two to three feet wide and 

 three feet apart ; course in general N. E. by E. ,* one containing a 



* I owe this notice to the kindness of a friend. 



Vol. XXXIV.— No. 1. 15 



