200 
THE FRESH-WATER LOCHS OF SCOTLAND 
of the loch, break with great force upon this shore. At Dores Bay a 
similar but smaller and less stony beach may be seen. 
A few aquatic plants are found in Foyers Bay, but only such as 
are common in the loch. The bay has been formed by detrital matter 
brought into the loch by the river Foyers. So great has been the 
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 works of the British Aluminium 
Company are situated at Foyers Bay. 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. From Foyers to Borlum 
there is practically no shore flora, and where the bottom is agreeable 
to the development of submerged plants, only those species that are 
found elsewhere about the loch thrive. The submerged rocks are 
frequently covered with Algae and Bryophyta, chiefly forms of Zygnema, 
Nardia, and Scapania (see Plates V. and VL). 
Loch Uanagan is situated in the Great Glen, about a mile south- 
west of Fort Augustus ; it is about half a mile long, and is 43 feeh deep 
in its deepest part. Its shores, which enter the water at a gentle 
slope, are sandy or stony, and its water is rather peaty. The affluent 
at the south-west end has introduced a large amount of detrital matter 
into the loch ; a considerable area of shallow water thus formed is 
covered with vegetation. At the opposite end of the loch, although 
the water is shallow, there is little vegetation, owing to the erosive 
power of the waves caused by the prevailing westerly winds. The 
general features of the aquatic and marsh flora are similar to what is 
found in the shallow water and marshes of Loch Ness ; there are, 
however, differences. Here we have a colony of Scirpus lacustris, the 
largest specimens of which rise 5 feet above the surface of water 
7 feet deep. There is an abundant bottom carpet of Characeas — 
Chara fragilis, var. delicatula, from the margin to 20 feet deep, and 
Nitella opaca from 10 to 30 feet deep. A considerable variety of 
other species occurs in this loch. From the north-west shore of the 
loch rises a considerable hill ; this is covered with coniferous trees 
extendino; beyond the lenscth of the loch and over the hill to the bank 
of the Caledonian Canal. 
Passing along the Canal from Fort Augustus to Loch Oich, we 
encounter, in places where the Canal has been made through small and 
shallow lochs, a very abundant aquatic flora. The submerged sides 
of the Canal are also well clothed. All the plants, however, are those 
quite common to the waters of the district, and call for no special 
comment, except that Coiltry Loch is in parts simply filled with five 
