of a part of the Saguenay Country. 187 
obvious to us, that the fine clays and marls, in which this coun- 
try abounds, are the washings of the decomposing rocks, which, 
being first suspended ia the water as an impalpable powder, 
afterwards subside at the bases and on the gently sloping sides 
of the rocks from whence they are derived. 
Mr. Nixon, upon his return, kindly furnished the following 
specimens of Rocks and Earths, with the information as to 
where they were procured: 
ROCKS, 
No. 1.—Of felspar alone, similar to all the rocks from the Grand 
Décharge to Koucouathime river.—From the second 
rapid on the Peribonea river this specimen was taken, 
and Mr. Nixon describes the same rock as extending 
from the foot of the first rapid to the foot of the 
third fall, torming rocky banks on both sides ; what 
soil there is in the distance is sandy. This rock 
was traversed by a vein of granite, the felspar in which 
was in large crystals and greatly predominating. 
2.—A detatched mass of magnetic iron near No. I. 
$.—Like No, 1—From the great falls on the Peribonea. 
4.—This is an equable mixture ot hornblende and fel- 
spar, the latter/having a glandular arrangement in the 
former bearing some resemblance to porphyry. In 
naming rocks composed of hornblende and felspar, 
we have invariably in this report called those traps 
in which the former mineral predominates, while the 
term syenite has been restricted to those in which the 
felspar is the most abundant mineral. In the present 
instance therefore ia which there is no predominancy 
of either, both terms are equally applicable, but we 
have chosen that of trap because the felspar in it, by 
its resemblance to quartz, bestows upon the speci- 
men in questiou a character ef coincidence with the 
Ss trap 
, 
