304 
BATHYMETRICAL SURVEY OF 
Loch an Lagain (see Plate LXX.). — Loch an Lagain (or Laggan) 
lies about miles to the north-east of Bonar Bridge. It receives the 
outflow from Loch Laro (which was not sounded), and its superfluent 
waters are carried by the river Evelix, after a long winding course, 
into the Dornoch firth. It is a small, comparatively shallow loch, 
trending almost east and west, one mile in length, with a maximum 
width towards the western end of nearly a quarter of a mile, narrowing 
gradually towards the eastern end. Its waters cover an area of about 
68 acres, and it drains a lelatively large tract of country, the area of 
which exceeds 8 square miles — an area 74 times greater than that of 
the loch. The maximum depth of 18 feet was observed near the centre 
of the loch, but towards the northern shore. The volume of water 
is estimated at 23 million cubic feet, and the mean depth at feet. 
The loch was surveyed on September 25, 1902, but the elevation 
of the lake-surface above the sea could not be determined ; the 
Ordnance Survey officers levelled the loch on November 23, 1869, and 
found the elevation to be 446*2 feet above sea-level. The lake-floor 
is quite simple in conformation, with no irregularities, the deeper water 
approaching nearer to the eastern than to the western end ; the area 
covered by less than 10 feet of water is about 49 acres, or 71 per cent, 
of the total area of the loch. The temperature of the surface water was 
53°*0 Fahr., and a reading at a depth of 9 feet gave 52°*9. 
Loclb Buidhc (see Plate LXX.). — Loch Buidhe (or Buie) lies amid 
moorland hills about 5 miles to the north-east of Bonar Bridge, the road 
from that place to Golspie running along its southern shore. It receives 
the outflow from Lochs Cracail Mor and Cracail Beag (which were not 
sounded), and flows, as already stated, into the head of Loch Fleet. It 
is a good trout loch, but an attempt to introduce salmon failed. The 
loch trends east and west, and is 1| miles in length, with a maximum 
breadth of nearly a quarter of a mile. Its waters cover an area of about 
133 acres, and it drains an area of about 8| square miles — an area over 
40 times greater than that of the loch. The maximum depth of 36 feet 
was observed approximately in the centre of the loch. The volume 
of water is estimated at 68 million cubic feet, and the mean depth at 
11| feet. The loch was surveyed on September 25, 1902, when the 
elevation of the lake-surface above the sea was found to be 528*45 feet ; 
when visited by the officers of the Ordnance Survey on May 21, 1870, 
the elevation was 527*3 feet above sea-level. By means of the sluice 
at the east end of the loch the level of the water may be raised 4 or 
5 feet, but it is seldom, or never, used ; according to the keeper, the 
water may fall 2 feet below the level on the date of the survey. 
Loch Buidhe is quite simple in conformation, the bottom sinking 
gradually on all sides from the shore to the deepest part, which occupies 
a central position. The area of the lake-floor covered by less than 10 
