ee 
: = 
Lead Mines, &. of Hampshire County, Mass. 26% 
2d. In the drifi to the a age glen bees bt fees of cal- 
careous spar are ‘seen in druse ses, in gre undance, in the 
solid granite, as the pas vein is cached I am fur- 
with the rocks in which they were situated, from the fact that 
the mica slate, in the immediate vicinity of the galena veins, 
often has veins of quartz in it, much disposed to crystaliza- 
tion ; and when this is the case, it is a pretty sure indication 
that a galena vein is nearby. Sometimes the nests of quartz 
n mica slate, near galena veins, have this tendency to erys- 
talization, and m may occasionally include a little galena or 
copper pyrites. he galena veins of this Ss region sometimes 
cut through mica slate, but their real place seems to be in 
granite, below the mica slate, and they only now and then 
run into the mica slate above. Whenever they do run thus 
into the mica slate, they invariably grow narrower as the stra 
tum of mica slate grows thicker, and are soon lost to our 
view. ‘These galena veins seem all to have been exposed 
by the wearing away of the superincumbent rocks, and 
we may with propriety suppose that many more are con- 
ead by the Packie them, est he adiesaies tertiary for- 
mation 
It is worthy of remark, that the surfaces of the galena 
veins of this region, especially when the gangue is quartz, 
the a of water. In the vicinity ne gale os are 
found blocks of their gangue, contai 
These blocks are loose, detached masses, Ca rounded 
and polished, and were undoubtedly broken from the veins 
and scattered about by the agency of water, whence, by 
sitions they have aequired their rounded and smooth sur- 
fac 
of this region seem to inet beak eat 
The galena ie outs ain ae ccna ae 
ay vast quantities of rocks down 
to granite. All these vems, except that at Hatfield, 
seem disposed to follow the granite ges which stretch 
along the borders of the Connecticut valley, , 
east and south-west. They follow these ranges in a longi- 
