210 
BATHYMETEICAL SUBVEY OF 
(August 11, 1903) the surface was 95-2 feet above sea-level. The tempera- 
ture was uniform at 58°' 0 Fahr., identical readings being recorded at the 
surface, 20 feet, and 40 feet. 
Loch Cuil AiridJi n’ Flod (see Plate LXXX.) is a small narrow loch of 
irregular form, being really an inlet from Loch Troalaval on its south 
side. It is nearly a mile in length, and a quarter of a mile in maximum 
breadth. It is shallow, with a maximum depth of 9 feet and a mean depth 
of 4J feet. ^ The superficial area is about 61 acres, and the volume of 
water 12 millions of cubic feet. The drainage area, including Loch 
Airidh na Ceardaich, is scarcely 1 square mile. At the north end it joins 
Loch Trealaval by a broad channel, and is connected with Loch Airidh na 
Ceardaich, which is very slightly higher in level, at the south end. 
Loch Airidh na Ceardaich (see Plate LXXX.) is a small loch to the 
south of Loch Trealaval, with which it communicates through Loch Cuil 
Airidh a’ Flod. It is of very irregular shape. The length is scarcely 
two-thirds of a mile, and the greatest breadth a quarter of a mile. The 
maximum depth is 22 feet, and the mean depth 6 feet. The area is about 
36 acres, and the volume 9 millions of cubic feet. The area drained 
measures one-fifth of a square mile. When surveyed, the surface was only 
an inch higher than Loch Cuil Airidh a’ Flod, with which it is connected 
at the south-western extremity. 
Loch nan Deaspoirt (see Plate LXXX.) is a small triangular loch 
between Balallan and Laxey, on the north shore of Loch Erisort. To 
north and south many little hills rise from 100 to 200 feet above the 
loch. The length from north-west to south-east is three-quarters of a 
mile, and the greatest breadth, at the extreme south end, a quarter of 
a mile. It is a simple basin, increasing in depth from north-Avest 
to soAith-east, to the maximum of 56 feet, a quarter of a mile from the 
lower end. The depth continues over 40 feet to close to the south end. 
The mean depth is 21 feet, the area about 55 acres, and the volume 50 
millions of cubic feet. The drainage area, including Loch Dhomhnuill 
Bhig, is a little over a square mile. A small burn, a quarter of a mile 
long, comes ^ from Loeh Dhomhnuill Bhig, and a similar burn goes east 
to the head of Loch Valtos. The level was 59*2 feet on August 14, 1903. 
The temperature at the surface was 58°*0 Fahr., at 25 feet 58°*0, and at 
48 feet 57°'0, 
Loch Dhomhnuill Bhig (see Plate LXXX.) is a , small narrowly tri- 
angular loch, about 1 mile to the north of Loch Erisort. The low hills 
bordering the loch rise to between 200 and 250 feet, or over 150 feet above 
the surface. The length from north-west to south-east is a little over half 
a mile, the maximum breadth, at the south end, a quarter of a mile. The 
loch is shallow, being 4 feet in the middle, and deepening to 8 feet near 
