318 Scientific Intelligence. 
a hard siliceous granitoid gneiss, varying into true granite, form- 
ing the eastern foot of Mount Willard, to the east of the Mount 
Willard poser in the Notch; ae ‘continuing southward, but 
at first a little westward, andalusite slate , Meeting the Mount 
Willard granite parallel with its “per eae s if conformable to it, 
and extending southward to the top of Bot Willey; then, on 
the southeast side and foot of Mount Willey, the Mount Willard 
granite again, which becomes, five miles south of the Notch, at 
: : 
ebster; and a this, far up t the s ides of this mountain, the 
“ Montalban schists”. (feldspathic mica schist chiefly), the charac- 
terizing rock of the Mount Washington range. The rocks of the 
region and of Mount Washington dip, with some local exceptions, 
to the westwar 
a acare facts respecting the rocks are here cited from the 
rt, as an introduction to a point of very PIOmSnEDY interest-— 
e 
«1,200 feet ee the Spe ae Going southward in the gorge 
“ster, at a "height nae to that of the top of esd Willard, where 
it has a thickness of two hundred to three hundred os Its 
sient coches from. "the Notch, “is not in a right line, on 
sesiaid to the writer’s observations at the place, the granite becomes sye- 
nos ne a substitution of hornblende for black mica (biotite). The other ingredi- 
ents are precisely the same—gray feldspar and gray quartz, so that the two rocks 
are iden tu apieon one. It is an interesting example of the abrupt transition 
“betwee two rocks, and is well worthy of a visit from those who are inter- 
‘and lower parts of one’ original, stration br succeshite strata was consi 
without finding reason to sustain it. 
