256 
THE FRESH-WATER LOCHS OF SCOTLAND 
plants are practically absent. A few leaves of Littorella lacustris, 
that had been cast upon the shore, were the only evidence of sub- 
mersed aquatic plants that I could discover without the aid of the boat, 
which at the time of my visit was out of repair. Possibly there are 
plants upon its bottom, but so far as I could find, this loch is devoid 
of botanical interest. 
Black Loch is a small sheet of water about a mile west of Loch 
Glow, and is surrounded by hills. The water is somewhat peaty, and 
there is scarcely any shore, save a few stony places here and there, as 
the grassy moor terminates in a bank at the water's edge. There is a 
thin association of Phragmites communis stretching along the south 
shore. Carex rostrata and Equisetum limosum occur in patches 
about the margin, Nymph^iea intermedia grows at the west end, 
whilst Potamogeton rufescens, var. spathulifolius, grows there, and at 
other parts of the loch as well, in great abundance. A number of 
common plants were also noticed at this loch. 
Loch Dow is a small oval sheet of water, situated in a hollow of 
the grassy moor, half a mile north-east of Loch Glow. The water is 
slightly peaty, and the stony or rocky shores on the north and east 
are narrow, with a sparse vegetation, or the moor meets the water 
without the intervention of a shore. Extending around the south 
and west sides there is an extensive bog, mostly occupied by Carex 
rostrata, which advances into the water on the one hand and merges 
into the grass formations of the moor on the other hand. A number 
of other common plants occur here. 
Loch Larg is a few hundreds of yards north of the last-mentioned, 
and is very similar to it, excepting that its eastern shore is more 
stony. There is a flat, boggy area along the west side, which is 
covered, near the water, with Carex rostrata. Adjoining the moor 
this bog is overgrown with Calluna vulgaris, Polytrichum commune, 
P. gracile, Sphagnum cymbifolium, S. intermedium, etc. A slight 
but sudden rise of the ground causes an abrupt termination to the 
vegetation just mentioned, and in its place associations of grass-like 
plants, amongst which Scirpus csespitosus is dominant, extend towards 
the moor. The line of demarcation between the Calluna and the 
grass-like formations is quite sharp, and probably marks the original 
extent of the loch. A number of plants commonly found at hill 
lochs occur here, including several Bryophytes which flourish at the 
two foregoing lochs as well. 
Harperleas Reservoir is situated on the L.omond Hills, at an 
elevation of 848 feet above sea-level. It is about half a mile long, 
and is of an irregular shape, with clear but somewhat peaty water. 
It has been formed by the construction of a long dam at the east 
end. The south shore is either stony or muddy, and at some places 
