THE FRESH-WATER LOCHS OF SCOTLAND. 
273 
0 to 50 feet 
482 acres 
42*7 per cent. 
50 „ 100 ,, 
385 „ 
34*1 
>5 
100 „ 150 „ 
208 „ 
18-4 
>> 
Over 150 ,, 
54 „ 
4-8 
J ? 
1129 „ 
1000 
5 5 
Temperature Observations . — The following table gives the results of 
observations taken in Loch Luichart by Mr. Clark on August 25, 1901, 
and by the Lake Survey on August 16, 1902 : — 
Depth in feet. 
August 25, 1901 
(R. M. Clark). 
August 16, 1902, 
5 p.m. 
Deepest part of loch 
in 152 feet. 
August 16, 1902, 
6 p.m. 
Near N.W. end in 
93 feet. 
° Fahr. 
° Fahr. 
° Fahr. 
0 
60-6 
55*9 
56 0 
10 
60-0 
20 
59-6 
55 -8 
40 
59-1 
50 
54-8 
56-0 
60 
57 -2 
70 
56-0 
75 
51 ‘6 
' 
80 
50-9 
90 
48*5 
100 
50-5 
48-4 
150 
48-0 
The range of temperature shown by the 1901 observations amounts 
to 10°, while that shown by the 1902 observations amounts to 8°. The 
temperature of the upper 60 feet of water was higher in 1901 than was 
observed in 1902, as was also the case at a depth of 100 feet, but a 
lower reading was recorded at 80 feet in 1901 than at 70 and 75 feet in 
1902. The two serials taken in 1902 show the effect of the strong wind 
which was blowing up the loch at the time of the survey, the maximum 
temperature observed extending down to a depth of 70 feet near the 
head of the loch, whereas 1^ miles further down the loch the temperature 
was always lower, amounting to a difference of l°-2 at 50 feet and 4°*4 
at 70 feet, beyond which depth a much larger fall of temperature was 
observed towards the head of the loch than was recorded farther down 
(equal to a fall of 7°*5 in the interval of 20 feet between 70 and 90 feet 
in the former case, and a fall of 3°-2 in the interval of 25 feet between 
75 and 100 feet in the latter case). 
Loch Bea7vnachan (see Plate LVIII.). — Loch Beannachan (or Ben- 
nachran) is situated at the head of Strath Conon, amid wild moorland 
scenery. It trends in a west-north-west and east-south-east direction, 
T 
