Dr. Allen on W. est River Mountain. 75 
The rock, through which the workmen have passed in 
making the shaft, i is mica slate, passing into granular quartz. 
In some instances, however, the quartz is found crystalized, 
but it is neither frequent nor elegant. 
aving the shaft, and ascending to the op of this cliff, 
on “the west side, you observe a descent of one. hundred 
feet perpendicular, and from the bottom of this the rocks 
are scattered in huge broken masses, in such a manner, that 
an inclined plane over the whole would form an angle of 
about 45°, for the distance of ten or twelve rods where it 
intersects the western section oe or mountain. 
be discovered. How then, it may be asked, are we to ac- 
count forthe +e eated reports heard at Fort Dummer? 
Could they be imaginary ?- Re ee ee: 
“We have no right to’ coutlade they Were, on the fects 
were related by persons whose testimony would net have 
been doubted on other occasions, and why should they be 
called in question in this? It is asserted in Bruce’s Jour- 
nal, that the reports were caused “ by the wind’s oe 
through the clift of the mountain near the shaft.” If so 
why are not the same noises heard at the present time? 
Then to what cause shall we attribute these noises like 
on the mountain? ‘The most probable conclusion 
is, ‘that they were produced by the falling of the immense 
masses of rocks from the western side of the eastern cliff. 
By this conclusion every difficulty is removed. Go to the 
spot, and there you will find evidences in favour of this 
ps i stronger than language can describe,—but search 
for voleanoes; and you will find nothing dedarviniy your no- 
tice. 
In determining the geological character of the Wisep-siane 
mountain, I am happy to acknowledge the assistance of the 
Rev. Edward Hitchcock, A. M, of Deerfield, Mis. ses 
in filament ents—that it exhaled arsenic, by blow- ibe, and wag. not 
eae me aire. acid till the arsenic bad been expel then dissolved 
readily was precipitate ie white by muriate vot s o Seeman 
phat we "plete , does not aitiste arsenic, but n oar cichoe contetas 
arsenic—such is that at Mr. pues mine in Hantington El 
