THE FRESH-WATER LOCHS OP SCOTLAND. 
343 
intervals of 50 feet, and the percentages to the total area of the loch, 
and indicates the flat-bottomed character of the basin, the comparatively 
large area of the lake-floor covered by more than 150 feet of water 
being noteworthy : — 
0 to 
50 feet 
298 acres 
39 per cent, 
50 ,, 
100 ,, 
228 „ 
30 „ 
100 „ 
150 ,, 
121 „ 
16 „ 
Over 
150 „ 
109 „ 
15 „ 
756 „ 
100 „ 
Temperature Observations . — The following series of temperatures, 
taken at 4.30 p.m. on the date of the survey in the western basin, 
shows that the water was nearly uniform in temperature, the extreme 
range from surface to bottom being only 1° Fahr., the readings down 
to a depth of 50 feet being identical; — 
Surface 
10 feet 
25 „ 
50 „ 
100 „ 
150 „ 
50° -0 Fahr. 
tj\j \j i: cuj 
50° -0 ,, 
50° -0 „ 
50° -0 ,, 
49° -5 „ 
49° -0 „ 
Loch Sealhhag (see Plate LXXX.). — Loch Sealbhag lies to the east 
of, and is, as already stated, practically a continuation of Loch Mullar- 
doch. It trends in a north-east and south-westerly direction, and is 
two-thirds of a mile in length, with a maximum breadth towards the 
west end of nearly a quarter of a mile, whence it narrows gradually 
towards the north-east. Its waters cover an area of about 68 acres, and 
it drains directly an area of square miles, but since it receives the 
outflow from Lochs Lungard and Mullardoch, its total drainage area 
is nearly 54 square miles — an area nearly 500 times greater than that 
of the loch. The maximum depth of 56 feet was observed in the 
widest part of the loch towards the western end, and comparatively 
near the southern shore. The volume of water is estimated at 61 
million cubic feet, and the mean depth at over 20J feet. The loch 
was surveyed on October 5, 1903, but the elevation above the sea could 
not be determined. 
The wide western portion of Loch Sealbhag includes a deep basin 
exceeding 30 feet in depth, which approaches comparatively close 
to the western end, and is over a quarter of a mile in length. To 
the north-east of this basin the bottom rises, and falls again on 
approaching the outfall to a depth of 31 feet, the depth on the rise 
being 16 feet. The area of the lake-floor covered by less than 20 feet 
of water is about 39 acres, or 57 per cent, of the total area. The 
temperature of the surface water on the date of the survey was 
50°*5 Fahr. 
