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BULLETIN OF THE NATURAL HISTORY SOCIETY. 
Throughout this extent, including with the Lake Branch some 
ii miles in length and 314 feet of fall (or under 30 feet to the 
mile), the river flows always over drift, though occasionally 
washing against ledges on one or the other (usually the left) 
valley wall, and no part of the river is post-glacial. In many 
places the valley is greatly narrowed by great heaps of drift, but 
nowhere does this fill the deep valley, so that the river was able 
to cut it out without being forced from its old course. The 
country has the peneplained character, the hills, densely forested, 
being well back from the stream, especially in the upper part of 
the valley, where they are 300 or 400 feet above the river ; but they 
appear to lessen in height downwards, reaching not much over 
150 feet, at least near the river, near the Forks. The physio- 
graphic origin of this part of the river seems, therefore, plain ; 
it is in an old, pre-glacial, valley, no doubt one of the ancient 
radiating series from the central highlands. There is, however, 
an interesting possibility suggested by the curiously reentrant 
direction of McKendrick Brook, which enters the Renous in a 
pleasant basin, namely, that at one time this river emptied along 
the course of this brook, through Rocky Brook Lake and Cata- 
maran Brook into the Little South West. I was not able to test 
this possibility by further observation of those waters, but it 
would be quite in harmony with other facts in the courses of the 
rivers in this region. 
All along the river are frequent ledges, consisting above of 
the same mica schist which appears at Renous Lake, giving place, 
however, to fine-grained sandstone or quartzite lower, and some- 
what ferruginous slates still lower. In only one place did I find 
granite in situ, namely, about three miles below the Pear Lake 
Branch; while half a mile below it the same schist as above re- 
appears. The granite belt on the geological map should there- 
fore be greatly narrowed. 
6. Little South Branch . — This Branch I know only from 
hearsay. It has many small lakes at its head, which have been 
described to me by a lumberman as “ very fine lakes.” It is an 
insignificant stream at its mouth, much smaller than the North 
Branch. The general appearance of its valley here, combined 
