468 



Sc u 1 ntlfic Geology. 



consists of quartz arid feldspar only, the ingredients are usually in 

 lengthened prisms, so that the cross fracture presents the appearance 

 of written characters. It is the Pegmatite of the French geologists. 

 Dr. Macculloch thinks it occurs exclusively in veins. But that is not 

 the case in this country, unless every protruding mass of granite be 

 regarded as a vein. In the coarser varieties of our granite, a portion 

 of the mass generally a small proportion is graphic : and there 

 is no well marked line of distinction between the varieties. This is 

 particularly the case in respect to the pseudomorphous granite, so 

 common in Conway, Goshen, Williamsburgh,and Westhatnpton. In 

 Goshen a few years since, I found a specimen which afforded so per- 

 fect an example of the graphic arrangement in this rock that 1 

 thought it deserved to have its surface copied. 



