NATURAL HISTORY AND PHYSIOGRAPHY OF NEW BRUNSWICK. 315 " 
raises the question as to the location of the old head of the valley. 
The general morphological courses of the rivers in this section 
would imply that this old valley originally extended along the 
course of the portage to Holmes Lake, or else directly into Big 
Lake, and thence perhaps to Northwest Inlet. But the lowest 
point in the gap leading to Holmes Lake appears to be of con- 
siderable height, since the portage road rises some 150 feet above 
the lake, though of course this may be in part over drift. This 
part of the subject must await more careful study than I was able 
to give it. 
3. The Outlet of the North Branch Lake, to Pear Lake 
Stream. — This part of the Renous flows through a gap in the 
hills east of the lake, over a bed of mica schist ledges, with heavy 
rapids and small falls down to its junction with Pear Lake stream, 
a distance of a mile. It is typically and without question post- 
glacial, and is the more interesting since it is the only post-glacial 
portion of valley throughout the whole extent of the river from 
the lake to its mouth. 
4. The Pear Lake Stream. — This I have not seen above its 
mouth, but the appearance of the valley there, its precise con- 
tinuation of the course of the valley below this point, and other 
considerations given in an earlier note (No. 55), all combine to 
show that this is the true morphological continuation of the 
Renous, and that in pre-glacial times it emptied the Tuadook 
lakes into the Renous. Closer study will be needed to determine 
its precise morphological head. 
5. From Pear Lake Branch to Little South Branch. — Start- 
ing with a considerable deadwater, the river enters a boulder dis- 
trict, where it breaks up among islands and spreads out widely 
for a mile or two; it then traverses a series of deadwaters and 
pools separated by abrupt rips for a mile or more, after which it 
gradually becomes smoother with less fall and approximates to 
the gravelly type with stillwaters and pools, winding about amid 
occasional intervales, extremely pleasant to the canoeman. It 
continues to improve down to the old driving dam, where the 
boulders abruptly re-appear with much fall, making the river 
very rough ; but gradually the boulders diminish, and the river be- 
comes smoother down to the Forks of the Little South Branch. 
