Scientific Intelhgence. 437 
accompanying that communication. But on further examina- 
tion it has been found to be more extensive than was su 
posed. The texiure of the rock is coarse. Plates of mica, 
3 or 4 inches across, are common in it; and one specimen of 
a beautiful blue feldspar, the fragment only of a crystal, mea- 
sured in one direction 8 inches. 
Two circumstances in this range give it an interest in the 
eye of a geologist. The one is its proximity to sandstone and 
puddingstone; and the other, its small elevation in compari- 
son with the surrounding rocks of later formations. In some 
places no other rock could be found lying between the granite 
and puddingstone; though the soil prevented my observing 
whether there is an actual contact. But,in general there is a 
stratum of mica slate a few rods wide between these rocks, 
and not unfrequently gneiss lies between the mica slate and 
and puddingstone, five or six hundred feet higher than the 
granite. On the east, a mile or two distant, a mountain of 
sienite gradually rises to a still greater height than the pud- 
dingstone ; and on the southwest, at nearly the same distance, 
you can see an alluvial formation. . In.general this granite 
does not rise so,high-as-the adjacent rocks, whether secondary 
or primitive. os ag 
VEINS OF ORE IN THIS GRANITE. 
1. Of Galena in Leverett. 
This ore forms a narrow vein in the southwest part of the 
on land of Moses Smith, two miles from the Congre- 
The direction of the vein is nearly 
only a foot wide. The 
tewn, 
gational meeting-house. 
north and south, and where I saw it, 
gangue is sulphate of barytes. 
9. Of Galena, Copper Pyrites, and Blende. 
This vein is a little more than @ mile north of the one 
above described, and it may be @ continuation of the same 
Vol. I.....No. 4. 16 
