314 
BULLETIN OF THE NATURAL HISTORY SOCIETY. 
good river for game or fish. The river is settled thickly to above- 
tile Dungarvon, and sparingly still higher, chiefly by the descend- 
ants of Irish immigrants who came here from the lower Mirami- 
chi after 1832. Above it is a wilderness which has yielded great 
quantities of lumber. 
The river falls naturally into parts as follows : 
1. From its source to North Branch Lake . — I have not my- 
self seen any portion of this section of the river except its mouth 
in the lake ; but the timber line surveys, together with sketches 
given me by Mr. Henry Braithwaite, show its course to be ap- 
proximately as indicated on the accompanying map. As will 
be shown in the next note, this valley appears to be morpholo- 
gically an extension of that part of the Tuadook valley above the 
Crooked Deadwater, and, as there is low ground to the west- 
ward of the North Branch Lake, it is altogether likely that pre- 
glacially it flowed in a direct line into the lake instead of by its 
present circuitous route. The origin of this valley will also be 
discussed in the next note. 
2. North Branch Lake . — This attractive lake (1176 feet 
above the sea) is pear-shaped, a mile in length by a half 
in breadth, rock and sand rimmed, and apparently deep.. 
It lies in a considerable basin surrounded by heavily forested 
hills, though its immediate shore has been deforested by the dam- 
ming of the lake. It exhibits two noteworthy features ; first, its 
inlet is close to the outlet and occupies a marked valley extending 
to the southeast ; second, its northwest shore is composed of ex- 
tensive ledges of mica schist,* which have a strike in the direc- 
tion of the aforementioned inlet. Since now, as will presently 
be noted, the present outlet is typically post-glacial, there is no 
question, I believe, that this lake basin emptied pre-glacially into 
the lakes to the south-east along the lower course of the present 
inlet, and the ledges mark, a part of the old valley wall. This 
* Determined from my specimens by Professor L. W. Bailey, who has kindly 
identified also the other rocks mentioned in this note. Of some huge boulder-like 
masses, some fifteen or twenty in number, of a remarkable dark granitic rock 
lying on a shoal on the southeast side of the lake, he says, they are composed of 
a mixture of horneblende mica and quartz, the dark metallic-looking constituent 
being mica, and it is probably, intrusive. Evidently these masses have not been 
brought from any great distance, if indeed they are not simply detached parts of an 
underlying ledge of this material. 
