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1016 Proceedings of Royal Society of Edinburgh. [sess. 
hamulata, and Juncus fluitans ; none of them abundant. The 
littoral plants were merely isolated specimens of the commoner 
species here and there among the rocks. 
Loch Knockie much resembles Loch Kemp in general features. 
Its water is less peaty, and vegetation rather more plentiful, 
Car ex rostrata, Equisetum limosum, and Phragmites communis 
being abundant in sheltered bays. The photic zone extends to 
about 25 feet. No unusual features nor any but ordinary plants 
were observed. The loch, which is about 1^ miles long, is shown 
in fig. 92. 
Loch nan Lann possesses great natural beauty ; its shores are 
mostly stony and its water peaty. The aquatic flora is fairly 
abundant, but quite of the ordinary type and needs no comment. 
The features of this loch are similar in every respect to its 
neighbour, Loch Kemp. Fig. 93 represents the north end of the 
loch, the larger portion being obscured by the point projecting 
into the loch on the left. 
Loch Tarff is 956 feet above sea level ; its shores are mostly stony 
and rocky, and its water peaty. It has several small islands, the 
largest of which is the breeding place of a large number of gulls. 
This island is overgrown with stunted birch, alder, and willow, 
with an undergrowth of Calluna, etc. The branches of the trees 
are thickly invested with the lichen Alectoria j ubata, giving them 
a fantastic appearance. Another island has an undergrowth of 
Epilobium angustifolium and Capnoides claviculata ; a third has 
an abundance of Cnicus heterophyllus : yet none of these plants 
appear to be abundant anywhere else near the loch. Ranunculus 
hederaceus occurs sparingly on the shore, probably a mere casual, 
as I have not seen it at any other loch of this area. Menyanthes 
trifoliata, Carex rostrata, C. aquatilis are abundant in shallow 
bays. Littorella, Lobelia, and Isoetes carpet the bottom. Chara 
fragilis, var. Nitella opaca, Myriophyllum alterniflorum, Juncus 
fluitans, Callitriche hamulata, Utricularia vulgaris, Sparganium 
minimum, Potamogeton natans, P. lucens, Fontinalis antipyretica 
are all abundant as usual. Equisetum limosum not abundant. 
Wet rocks are frequently covered with Blindia acuta, Nardia 
compressa, and Zygnema Yaucherii. Ranunculus Flammula, 
Caltha palustris, Juncus effusus, Heleocharis palustris, Eriophorum 
