THE FRESH-WATER LOCHS OF SCOTLAND. 
83 
readings, as a rule, were taken near shore, and the lower readings 
towards the centre of the loch over deep water. When visited on May 
28, 1903, the surface temperature at noon, about a mile from Kenmore, 
was found to be 49°*3. 
Two serial temperatures were taken beneath the surface in May, 
1902, and one series in May, 1903, as given in the following table : — 
Depth (feet). 
May 1, 1902. 
Off Ardeonaig. 
May 6, 1902. 
Between Laweis and 
Fearnan, 4 p.m. 
May 28, 1903. 
1 mile west of Kenmore, 
noon. 
°F. 
°F. 
°F. 
0 
43-8 
42 0 
49-3 
3 
47 0 
5 
43-2 
42 0 
44-5 
10 
43-2 
41-9 
44 0 
20 
42 0 
41-9 
25 
43 T 
30 
41 -9 
41 -8 
50 
41 -7 
41-8 
42-9 
100 
41-2 
41-7 
42-5 
150 
41 0 
200 
40-8 
41-2 
250 
40-5 
300 
40*3 
41-0 
350 
41 0 
It will be seen that on May 1, 1902, the temperature of the water down 
to 30 feet was higher than on May 6, 1902, while from 50 feet down- 
wards it was lower. The range of temperature between the surface and 
a depth of 300 feet on May 1 was 3°*5 (from 40°’3 to 43°*8), while on 
May 6 it was only 1° (from 41° to 42°). On May 28, 1903, the tem- 
perature of the water was found to be considerably higher from the 
surface down to a depth of 100 feet than was observed in the previous 
May, the range of temperature in the upper 100 feet of water being 6°-8 
(from 42°-5 to 49°-3). 
Loch Derculich (see Plate XXVI.). — Loch Derculich, situated in 
Strathtay amid beautiful scenery, affords good fishing, but is strictly 
preserved ; it flows by the Derculich burn into the river Tay to the 
north-east of Aberfeldy. It is surrounded by low rounded hills covered 
with heather, and there are few conspicuous boulders, but many small 
ones. To the north are high, steep hills (Farragon, &c.), with grey 
screes. The knoll forming the point at the boathouse on the south- 
eastern shore is high and planted with trees. The burn flows out of the 
loch by an artificial dam and sluice, which was open on the date of the 
survey, and the water in the loch was very low, a long gravelly point 
(not shown on the Ordnance Survey chart) appearing, and the island to 
the north was nearly, while the island to the south was quite, joined 
to the shore. Loch Derculich (pronounced Der’clich) is over half a mile 
