118 T. Sterry Hunt on Granitie Rocks. 
Potsdam sandstone, which rests upon their eroded outerops, 
and sometimes includes worn fragments of apatite derived from 
em. 
graphite. 
_ §87. The resemblance between the minerals of these Lauren: _ 
tian veinstones and the same species brought from Norway, Was 
noticed so long ago as 1827, by Dr. William Meade (this — 
Daubrée agrees with Scheerer in regarding these veinstones & 
produced by a process of secretion, in opposition to Durocheh 
