44 Miscellaneous Notices of American 
Satin spar was observed by Mr. Morse at Glenn’s falis ¢ 
it is in thin, delicate, but extensive veins, principally in the 
fallen rocks below the bridge; generally it is of a brilliant 
white, but sometimes it is black, although still retaining its 
fibrous structure. Crystals of Bitterspath, well defined and 
glistening in the black lime stone, occur at Glenn’s falls. 
Compact dove-coloured limestone, apparently of the trans- 
ition class, forms ledges at the head of Lake George, and 
count for,) there are numerous holes worn into the solid 
rock, sometimes shallow and irregular, but frequently deep 
and cylindrical, and bearing a very exact resemblance to 
those which are common in the ledges upon which cataracts 
fall ; they appear as if they were produced by the same 
cause, namely, the wearing agency of water aided by small 
stones which it impels, in incessant vortiginous revolutions. 
If one were to judge from appearances, he would infer that 
a torrent of water once swept, with great impetuosity, 
through this defile, and wore these rocks as we now see 
‘them ; this supposition has perhaps nothing to support it 
except these appearances, and if we relinquish it, we have 
no agent to which we can attribute them, but the ordinary 
wearing effects of atmospheric influences, which appear alto- 
gether incompetent to the production of these results. 
Quartz crystals in the islands of the south end of Lake 
George —These are commonly obtained by visitors; they 
are now become much more rare than formerly, and those 
which are procured are small, although still very limpid and 
beautiful. On visiting the island called Diamond Island, 
three or four miles from the village of Caldwell, and which 
has afforded most of these crystals, we found them occur-_ 
ring in the same compact limestone which forms the ledges 
at the head of the lake. This small island, scarcely cov- 
ering the area of a common kitchen garden, is inhabited by 
a family, who occupy a small but comfortable house, and 
constantly explore the rocks for the crystals. These are 
found lining drusy cavities, and forming geodes in the lime- 
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