222 
BATHYMETRICAL SURVEY OF 
area 10 J times greater, or nearly square miles. The maximum 
depth of 93 feet was observed about 300 yards from the eastern shore. 
The volume of water contained in the loch is estimated at 228 millions 
of cubic feet, and the mean depth at 35 J feet. The breadth of the 
loch at the position of the deepest sounding is sixteen times the depth. 
The shore development is 2-15, and the insulosity 0’014. 
The 25-feet area is continuous, passing to the north of the large 
island. The 50- and 75-feet areas lie in the eastern part of the loch, 
though there is one sounding of 50 feet in the extreme west. The 
50-feet area has a length of nearly half a mile, and extends to within 
40 yards of the eastern shore, while the 75-feet area is a quarter of 
a mile in length. The areas between the consecutive contour-lines, 
and the percentages to the total area of the loch, are as follows : — 
0 to 25 feet 
67 acres 
45 ’4 per cent. 
25 ,, 50 ,, 
42 „ 
28-3 „ 
50 ,, /5 ,, 
20 „ 
13-8 „ 
Over 75 ,, 
19 ,, 
12-5 
148 ,, 
100-0 
The temperature of the surface water in Loch Garbhaig at 4 p.m. 
on July 25, 1902, was 54°*9 Fahr., or nearly 4° warmer than that 
observed in Lochan Fada, which lies at the same elevation; no serial 
temperatures were taken. 
Loch Glair (see Plate XLIX.). — Loch Clair is situated about three 
miles to the south-west of Kinlochewe, at the head of Loch Maree. The 
ground to the north and west rises to the heights of Beinn Eighe and 
Sgurr Dubh, the lower ground being covered by moraines. It was 
surveyed on July 24, 1902, and the elevation of the water surface above 
the sea was determined by levelling from bench-mark as being 303T 
feet. 
Loch Clair is over IJ miles in length, with a maximum breadth Of 
about 600 yards, the mean breadth being about 300 yards. Its waters 
cover an area of about 160 acres (a quarter of a square mile), and it 
drains directly an area of 6J square miles, but since it receives the 
outflow from Loch Coulin its total drainage area is 20J square miles 
— an area 83 times greater than that of the loch. The miaximum 
depth is identical with that observed in Loch Garbhaig, viz., 93 feet, 
and occurs about 150 yards from the eastern shore off Creag naHianaich. 
The volume is estimated at 287 millions of cubic feet, and the mean 
depth at 42 feet. The breadth of the loch at the position of the deepest 
sounding is sixteen times the depth. The shore development is 2*01, 
and the insulosity very small (O’OOl), there being only two small 
islands in the loch. 
