208 THE FKESH-WATER LOCHS OF SCOTLAND 
hamulata, Polygonum amphibium, Sparganium natans, Glyceria 
fliiitans, Carex rostrata, C. Goodenovii, C. aquatilis, C. flava, Heleo- 
charis palustris, Eriophorum polystachion, Comarum palustre, 
Menyanthes trifoliata, Caltha palustris, Triglochin palustre, Pedicu- 
laris palustris, Cardamine pratensis, Ranunculus Flammula, Spiraea 
Ulmaria, Hydrocotyle vulgaris, Scapania undulata, Nardia emarginata, 
Conferva, Zygnema, Batrachospermum, etc. 
An Dubh Lochan is a small loch near the last-mentioned. It is 
entirely surrounded by a wide swamp, owing to which the water is 
almost unapproachable. The plants are those usual to .the district. 
Loch a' Choire is situated a little to the north of Loch Ruthven, 
at an elevation of 865 feet above sea-level. The water is not very 
peaty. The south-east shore is flat, mostly sandy, and merges 
gradually into moorland. Otherwise the shores are rocky or stony, 
excepting for sandy bays here and there. Abruptly from its north- 
west shore there rises a considerable hill, the upper portion of which 
ends in a bold, perpendicular escarpment. The scanty vegetation 
consists of a few of the species common to the district. 
Loch Dunmaglass is partially an artificial loch, the original one 
having been extended by the construction of a dam at the north- 
east end. Meall Nochd rises almost perpendicularly from its western 
shore, and the flank of Beinn Dubh-choire, on the east, is also steep. 
Being closed in by precipitous and bare rocky mountains, having but 
little peat, its water is clear and only slightly peaty. The scenery 
is very wild. It is remarkable for being the only loch in the Ness 
Area in which I found Hippuris vulgaris, but only the submerged 
shoots occurred. The other plants of the loch are of the species 
usual to the district. 
Loch Mhor. — In this large loch I found not a trace of any living 
plant. It is over 600 feet above sea-level, and the water is extremely 
peaty. Originally there were two lochs on this site, Loch Farraline 
and Loch Garth. In order to secure a constant and efficient supply 
of water for their turbines, the British Aluminium Company at 
Foyers, who own the lochs, undertook operations by which the two 
lochs were joined. By this work the level of the lower loch was 
raised some 20 feet, by means of a dam, whereby one large loch was 
formed having a total length of about five miles ; and this was 
named Loch Mhor. The Company's turbines utilise an enormous 
amount of water ; consequently, in accordance with the rainfall, the 
surface level of the loch is continually changing, the difference 
between maximum and minimum being about 22 feet. Now, the 
water of this loch is so dark that, reasoning from other cases, I 
should imagine no plants could exist at a greater depth than 10 or 
12 feet. The consequence, therefore, of an extra 20 feet of this 
