of a part of the Saguenay Country. 97 
cal term stunning, and of which the result is a disagreeable 
opaque white mark, generally in the very place where the 
deepest shade is wanted.” 
It is hoped that the foregoing digrssion will be excused, as 
it affords information not generally before the public, by which 
the means of estimating the white marbles of Canada are rea- 
dily obtained ; as well those whose localities are already ascer- 
tained as others that will eventually be so. P 
The rocks on both sides of the Saguenay, as high up as La 
Buole, (a mountain which stretches out into the river from the 
north eastern side, ina remarkable manner) are probably gra- 
nitic, and form a continuation of the same series met with in 
the more immediate neighbourhood of Tadousac. They have 
sometimes the appearance of being stratified and of dipping 
to the S. E. at an angle whichis nearly vertical. These rocks 
rise with almost perpendicular scarps to a considerable height, 
and their summits are barren, and in some places totally bare, 
in which latter case, the whitened surface of the rock, owing 
to the incipient decomposition of its felspar, resembles that of 
some limestones ; they are often also of a smoked or blackened 
appearance; nearly @ fleur d’eau, ared ferruginous baud cha- 
racterises these rocks. Their outline is rounded and mamillary, 
a character they lose asthe river is ascended, 
It was in the La Boule that we observed for the first time 
those singular masses of trap, sometimes under the form of veins 
or dykes, sometimes under the form of interfering and uncon- 
formable beds or strata, but most frequently as isolated patches 
both rounded and angular, the whole so deserving the attention 
of the geologist. As these trap appearances are chatacteristic 
of almost all the rocks we saw, it is necessary to describe the 
mineral contents of that aggregate to which we have applied 
this term, part cularly as without such a description it is almost 
unintelligible, owing to the loose and indefinite manner in 
N which 
