242 
THE FRESH-WATER LOCHS OF SCOTLAND 
adjoining Mochrum Loch has such an abundant aquatic flora. Mr 
David M'Dowall, the keeper, informed me that he had never seen any 
plants upon the net when netting the loch. The water was remark- 
ably free of plankton organisms, the tow-net gathering extremely 
little (end of August), but Mr M'Dowall told me that in early summer 
the water is thick and green with some organism that dies away to- 
wards the end of July. Perhaps the presence of this organism in the 
spring accounts for the absence of plants in the water. The scanty 
vegetation of the rocky shore was of no particular interest, being 
similar to that of Mochrum Loch, but less abundant. Lythrum 
Salicaria and Phalaris arundinacea were the most plentiful species. 
On Anabaglish Moss, to the north-west of Castle Loch, there are 
a number of small lochans of some interest, because of the abundance 
of their vegetation, which includes some unusual species — Cladium 
Mariscus, Schoenus nigricans, and Hypericum elodes being abundant. 
[Monreith Lake, near Port William, is entirely surrounded by 
wood, affording shelter to many rare species of water-fowL In 
addition to the usual marsh and aquatic plants, which grow here very 
luxuriantly, this lake is becoming choked up with Anacharis Alsinas- 
trum.— J.'M'A.] 
[Dowalton Loch, near Sorbie, was once an extensive sheet of water, 
but about sixty years ago it was almost emptied by cutting a deep 
outlet at its eastern end. Since then it has become overgrown with 
a dense growth of marsh plants, but cannot yet be said to be of much 
use agriculturally. — J. M'A.] 
[South of Whithorn are numerous small lochs becoming gradually 
overgrown with vegetation, amongst which several uncommon species 
of Carex may be found. Further south, and to the west of the Isle 
of Whithorn, there are several small lochs in which grows the beauti- 
ful Chara polyacantha. — J, M'A.] 
Barhapple Loch is four miles east of Glenluce, on an extension 
of the same moor as Castle Loch is on, from which it is distant about 
four miles. It is a circular loch, about a quarter of a mile across, 
with dirty, peaty water. The north side is bordered by a dense 
association of Phragmites communis, whilst the same plant occurs 
scattered over the peaty and muddy south shore. On the west side 
there is a considerable extent of marsh, dominated by Carex rostrata, 
C. filiformis, etc. On the east the shore is peaty or gravelly, and is 
bordered by a bank of peat 4 to 6 feet high. Interesting forms 
of Juncus bufonius, J. supinus, and Peplis Portula occur on the south 
side. There were very few mosses and no hepatics about the shores 
of this loch. 
Loch Dernaglar, half a mile south of the last-mentioned, is 
somewhat circular in outline, and about a third of a mile across. The 
