230 
BATHYMETEICAL SURVEY OF 
Loch an t-Slagain (see Plate L.). — Loch an t-Slagain lies to the east 
of Slaggan bay, at the entrance to Loch Ewe, into which it flows by 
the Allt an t-Slagain, It is surrounded by low hills, and receives the 
outflow from several small lochs lying to the east and south. It 
was surveyed on August 11, 1902 ; the elevation above the sea was 
determined by levelling to be 103’5 feet; when visited by the officers 
of the Ordnance Survey on May 5, 1875, its elevation was 102 -6 feet 
above sea-level. The height of the highest drift-mark observed was 
2-3 feet above the surface of the water on August 11, 1902, so that the 
range of level is probably between 3 and 4 feet. The loch trends in a 
north-west and south-east direction, and is two-thirds of a mile in 
length by one-third of a mile in maximum breadth. Its waters cover 
an area of about 77 acres, and it drains an area 17 times greater, or 
over 2 square miles. The maximum depth of 55 feet was observed 
comparatively very near the south-eastern shore. The volume of water 
is estimated at 55 million cubic feet, and the mean depth at 16^ feet. 
Loch an t-Slagain is of simple conformation, the 10-feet area being 
continuous from end to end, but the deeper water is cut into two 
portions by the shallower water around the central islands. To the 
north-west of the islands two soundings of 25 feet were recorded, 
while the deepest part of the loch lies to the south-east of the islands. 
The areas between the consecutive contour-lines, and the percentages 
to the total area, are as follows: — 
0 to 10 feet 
27 acres 
35 ’3 per cent. 
10 „ 25 „ 
39 „ 
50-6 
25,, 50 „ 
8 „ 
10-6 „ 
Over 50 ,, 
3 „ 
3*5 ,, 
77 „ 
100 0 
Thus 86 per cent, of the lake-floor is covered by less than 25 feet of 
water, and the major portion is covered by water between 10 and 25 
feet in depth. 
Loch Sguocl (see Plate L.). — Loch Sguod lies less than half a mile 
from the western shore of Loch Ewe (opposite the Isle of Ewe), into 
which it flows by the Uidh Chro. It drains the higher ground to the 
west and south-west by several streams flowing through the low peat 
bogs which surround the loch on all sides. It was surveyed on August 
15, 1902, but its elevation above the sea could not be determined; the 
water may rise 2 feet above its level on the date mentioned. Loch 
Sguod is nearly three-quarters of a mile in length, with a maximum 
breadth of nearly half a mile, the mean breadth being a quarter of a 
mile. Its waters cover an area of about 107 acres, and it drains an 
area 26 times greater, or square miles. The maximum depth of 
