
REPORTS ON EXCURSIONS. 283 
On the western side, or from S.W. round to N., the ridge 
between Loch Long and the valley almost parallel to it, up which 
the railway has come, does not rise beyond 928 feet above sea- 
level. Consideration of these facts suggests that the water in 
flowing to Loch Lomond has lost its road, an idea apparently sup- 
ported by the curious course of the northern branch of the 
Douglas Water. Rising on the north slopes of Tullich Hill, and 
flowing at first north, it soon veers round circularly till it runs a 
little south of west, then abruptly turns southward when it 
reaches the valley parallel to Loch Long, where it shortly again 
tends farther to the west, but on nearing the deeper hollow of 
Glen Douglas it circles to the S.E., and meeting the short branch 
from the south-west, the united stream flows E. and E.S.E. to Loch 
Lomond. But it is really more likely that the watershed of what 
is now the drainage area of Loch Lomond once extended to the 
west of Loch Long, and that the hollow occupied by this arm of 
the sea is of more recent origin than Glen Douglas. 
Mr. Peach, of the Geological Survey, says that an anticlinal 
axis passes a little to the east of this point, running N.E. and 8.W., 
that the strata between this point and Arrochar are very much 
altered and twisted, more so than those to the north and to the 
south, that the main joints in the rocks run north and south, thus 
determining the direction of the deep northern part of Loch 
Lomond, and that the dip to the westward of the anticline is 
toward Loch Long. The directions of the dip and of the joints, 
combined with the steep slope of the hillside above Loch Long, 
account for the fissures and slips noticed on our previous visit, 
and recorded in the report published in these Z’ransactions, Vol. 
IV., N.S., p. 360. The party was informed that observations 
show that a slow movement of the ground towards the loch 
is still in progress, to the extent of three-quarters of an inch 
during the last eighteen months. 
From the railway on the hillside above Loch Long splendid 
views are obtained of the loch and of the hills on the farther 
side, the principal summits being—The Brack, fully 2,500 feet ; 
Ben an Lochain, 2,955 feet; Ben Arthur, or The Cobbler, 2,891 
feet, most picturesque of all; Ben Narnain, 3,036 feet; and Ben 
Crois, 2,785 feet. 
- Nothing special falls to be recorded about the plants in the 
