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Proceedings of the Royal Society of Edinburgh. [Sess. 
water level was abnormally high (fig. 111). Salix repens covers the higher 
portions of the shore in some places at the west end. 
A little to the east of Harperleas is Ballo Reservoir, both being situated 
on an upland plateau which forms the south flank of the East and West 
Lomond Hills. These reservoirs are surrounded by moor of the grass or 
heather type, or by a superior pasture-land which is due to cultivation. 
Harperleas Reservoir is treeless, but Ballo has a plantation of conifers upon 
its south-west shore (fig. 112). There are also a few plantations in the 
neighbourhood of the reservoirs, which pleasingly relieve the sameness of 
the moor, and add a picturesque charm to this pleasant, although small, 
stretch of upland country. 
Ballo Reservoir has a somewhat pear-shaped outline, with the narrow 
end towards the south-east, in both of which respects it resembles Loch 
Leven on a small scale. It is about a mile long by J mile wide at the 
broadest part. In general features it much resembles Harperleas Reservoir, 
but there is less variety in the species of plants. At the north-west end 
there is an extensive peaty-muddy flat, covered with an association of 
Juncus effusus. This flat area extends out into the loch for some distance, 
and in the dry season is exposed by the falling of the water (fig. 112). It 
is covered with Littorella lacustris, Heleocharis acicularis, and Juncus 
fluitans, all of which assume the terrestrial habit when the water has 
receded. At the same end of the loch, but nearer the north side, Hydrocotyle 
vulgaris extends over a considerable area and forms a dense sward. 
Equisetum limosum forms a zone along a portion of the north shore, as at 
Harperleas Reservoir, behind which there is a strip of boggy ground 
covered with Carex, etc., and at one place there is an association of Typha 
latifolia. The shore along the north and east is flat and peaty, and a wide 
strip of it, exposed by the falling of the water (fig. 113), was more or less 
covered with Juncus fluitans, which was reverting towards the terrestrial 
type. Time did not permit me to make use of the boat at either of these 
reservoirs ; but as the water was very low when I was there, probably there 
were few plants in the water that could not be observed by other means. 
Besides those already mentioned, the following species were more or less 
common to both lochs : — -Chara fragilis, var. delicatula, Fontinalis antipyretica, 
Myriophyllum alterniflorum, Ranunculus aquatilis, Potamogeton natans, P. 
polygonifolius, Heleocharis palustris, Polygonum amphibium, Callitriche 
hamulata, C. stagnalis, Comarum palustre, Mentha aquatica, M. sativa, 
Carex rostrata, C. Goodenovii, C. flava, Juncus supinus, J. acutiflorus, J. 
lamprocarpus, J. effusus, J. bufonius, Myosotis palustris, Caltha palustris, 
Peplis Portula, Veronica scutellata, Gnaphalium uliginosum, Ranunculus 
