250 THE FRESH-WATER LOCHS OF SCOTLAND 
Potamogeton pusillus, P. filiformis, Zannichellia palustris, \ai\ 
brachystemon, Myriophyllum spicatum, Callitriche aiitnmnalis, 
Ranunculus circinatus, R. Baudotii, Chara aspera, etc. In many 
places large masses of Cladophora flavescens and Enteromorpha 
intestinalis were floating about at the surface. There are a few 
common bog mosses, but such are not abundant, as favourable situa- 
tions are scarce. It should be mentioned that Polygonum amphibium 
and the two species of Ranunculus cover a large area of the loch, and 
when in flower present a unique spectacle. 
Halton Reservoir is a small irregularly shaped sheet of water 
situated about two miles north of Largo. It has been formed by the 
widening of the natural gorge of the Halton Burn, and by the con- 
struction of a dam at the lower end. At the time of my visit the 
water had fallen about 12 feet below the full water-level, leaving 
upon the exposed mud the remains of a number of aquatic plants. 
Some of these were growing in terrestrial form upon the mud, 
e.g. Myriophyllum spicatum. Polygonum amphibium, Ranunculus 
peltatus, Potamogeton natans, Callitriche stagnalis, etc. Chara 
fragilis is extremely abundant, and Gnaphalium uliginosum forms a 
sward upon the sides near the full water-level. When the water is 
low this is not a very attractive place, because it has the appearance 
of a flooded quarry with a scanty vegetation upon its sides. 
Clatto Reservoir is situated about three miles south of Spring- 
field, in an upland district of which Clatto Hill is the highest point. 
It is a narrow sheet of water about three-quarters of a mile long, 
made by building a dam across the east end of the valley through 
which flows the Ceres Burn. The water is clear and not peaty, and 
is bordered in many places by a zone of marsh, or a narrow strip of 
stony shore may intervene between the water and the grassy banks. 
A plantation of coniferous trees skirts a portion of the south shore, 
otherwise the surrounding country is of the agricultural type. 
At the south-east end an arm to the reservoir has been formed by 
constructing a dam across an adjacent valley and excavating a con- 
nection. At the west side of this arm there is a large marsh similar 
in its features to one at the west end of the main body of water. A 
considerable number of plants occur at this reservoir, but I did not 
notice anything of particular interest. 
Carriston Reservoir is a circular sheet of water, a quarter of a 
mile across, situated two miles north-east of Markinch, in a rich 
agricultural district. It was formed bv the construction of a long 
dam across a valley through which flowed a tributary of the river 
Leven. The water is clear and not peaty. The dam occupies most 
of the west side, and there is not much shore on the south, as a bank 
which is faced with stone- work frequently enters the water. On the 
