256 Lead Mines, Se. of Hampshire County, Mass. 
side until it reaches the foot. At the foot, a small brook runs 
parallel with the range, and on its eastern bank, three or four 
rods distant, a ledge rises thirty feet, looking directly up the 
mountain. The vein is the ledge, and extends along the 
bank of the brook a third of a mile, or more, but sinks under 
the earth at each end. Apparently, the granite in which this 
ledge is situated has been lifted up the thirty feet, on the east- 
ern side of the vein, bringing up with it a part of the vein 
lying next to the elevated granite. How wide the vein is can- 
not be told, as the western part or side of it next the brook is 
concealed by geest. The vein or ledge contains more or less 
galena through its whole distance, and the rock or gangue 
is exceedingly tough and hard, so that it is almost impossible 
to break it with a sledge. The ledge is full of seams or fis- 
sures, which, admitting the water to freeze in them in the win- 
ter, thus project large blocks and boulders out of their beds, 
which blocks, falling away from the ledge, roll down to the 
k of the brook. On the faces or sides of thiesé detached 
blocks and boulders, and in druses, both in detached boul- 
ders and in the ledge itself, are found the pseudomorphous 
erystalizations of quartz. These crystals are in the form of 
hog-tocth spar, and in cubic projections, and were undoubt- 
edly moulded by the carbonate and fluate of lime, which, in 
some unaccountable manner, have been displaced. The 
moulds themselves are quartz, and their surface is covered 
with the most minute crystals, pointing every way. These 
erysi 
with pyramidal terminations. pon br 
moulds they are either hollow, or filled with small transpa- 
ve been lifted up twenty or thirty feet, looking down the 
> and presenting a mural front towards the south, but 
loping northerly until they sink under geest. 
4s seen the argentine. forming two veins, one 
