254 Lead Mines, &c. of Humpshire County, Mass. 
it, although blocks and masses of quartz, strongly disposed. 
to crystallization, and often containing galena, manganese 
and pyritous copper, are seen scattered at random upon the 
ground, for one-fourth or one-third of a mile, in the region 
around this mine. Sometimes I am inclined to think that 
this mine is much more extensive than it appears to be, where ~ 
the vein is discovered, and that it is covered by geest. The 
blocks are probably the gangue broken from the vein, and 
scattered about by some currents or movements of waters, 
It may indeed be supposed, that the blocks or masses may 
have been nests of quartz in mica slate, which being wasted 
away, would leave the quartz as we find it; but the fact, that 
the masses are all rounded and that they appear much abra- 
ded, would seem to militate against the last supposition. I 
have. often seen these rounded masses in the neighbourhood 
of other veins. 
_No. 6 is situated at the south-west part of Whately, on a 
high mountainous range of granite. The vein is three or 
four feet wide, and contains galena in considerable quantities, 
with a gangue of quartz. The situation of the vein is near 
No. 7 is the Whately vein, already described by Prof. 
Hitchcock. One. circumstance respecting this mine, which 
he omitted, I will notice; that is, the vein often sends off 
small veins of quartz into the granite. Some of them are 
3 ide. These veins run off in all possible direc- 
tions ; sometimes 
and then return to it again; at other times they run 
