1904 - 5 .] Flora of Scottish Lakes. 995 
amount of detritus brought down by this swift river, that the 
bottom of the loch opposite its delta has been silted up to the 
■extent of about 200 feet in vertical height. The large works of the 
British Aluminium Company give employment to a considerable 
number of persons. The selection of this remote spot as the site 
for an extensive mechanical industry is due to the water of the 
river Foyers affording a cheap motive power for the large turbines 
and dynamos that generate the enormous electrical force required 
for the operations of the Company. The winds carry the dust of 
cryolite from the works over the adjacent vegetation. The 
coniferous trees, by reason of their evergreen leaves, are being 
killed by this dust, the deciduous - leaved trees remaining 
apparently uninjured (fig. 25). A noted landmark of Loch Ness 
is the “ Horse-shoe,” an enormous scree of that shape on the slope 
■of Beinn a Bhacaidh, with its free ends rising from the water 
(fig. 10 ). A view taken from the middle of the loch, looking 
towards Fort- Augustus, is represented in fig. 26. This also shows 
the passage of the Great Glen between the mountains. 
Nearer Fort- Augustus is “ Corrie’s Cave,” formed by the falling 
away of a portion of the rock from the main body of the cliff, and 
said to have been the stronghold of an outlaw of that name. A 
view from this cave, looking towards Fort-Augustus (fig. 27), 
illustrates the steep and wooded slopes so common to Loch Ness. 
The nature of the shore below may be seen by fig. 28, which was 
photographed from Glen Doe pier. A little above the pier there 
is an enormous Alnus glutinosa with a bole about 17 feet in 
circumference ; the stem branches at about 9 feet from the ground. 
Growing in the fork is an ash-tree about 6 inches in diameter, 
sending its roots to earth by way of the hollow bole of the alder. 
The power of the waves to damage littoral trees is illustrated in 
fig. 29, in which the roots of Alnus glutinosa have been laid 
bare, and subsequently wounded by the rolling of the pebbles 
over them. Fig. 30 is a photograph of a transverse section of one 
of these wounded roots. Almost needless to say, no aquatic 
phanerogams can exist on such shores as recently described. Only 
in the little sheltered bays do we find a few of the common plants. 
The rocks, however, are frequently covered with algae and 
hepatics, chiefly varieties of Zygnema, Nardia, and Scapania. The 
