THE FRESH-WATER LOCHS OF SCOTLAND. 
115 
Surface ... 
10 feet ... 
20 „ ... 
30 „ ... 
59°-2 Fahr. 
59°-2 „ 
59°-2 „ 
59°-0 „ 
Loch Grennoch (see Plate XLIV.). — Loch Grermoch lies about 7 miles 
south-west of New Galloway. The hills are steep and high on both sides, 
especially to the west at the south end. Rock is exposed all round the 
loch, with many boulders and scanty patches of vegetation. The loch 
trends nearly north and south, and is 2 miles in length, with a maximum 
breadth of over one-third of a mile, the mean breadth being nearly a quarter 
of a mile. Its waters cover an area of about 290 acres, or nearly half 
a square mile, and it drains an area of over square miles. The 
maximum depth of 68 feet was found towards the southern end. The mean 
depth is estimated at 21 feet, and the volume of water at 263 million cubic 
feet. The elevation was 690*7 feet above the sea when the loch was 
surveyed on July 24, 1903, almost identical with that observed by the 
Ordnance Survey on September 7, 1894, viz. 690*6 feet. A drift-mark 
was observed 3 feet above the water, which might fall a foot lower. The 
loch forms a simple basin, the deeper water occupying the southern half ; 
the slope is steep in places, especially off the western shore near the 
southern end. About 70 per cent, of the lake-floor is covered by less than 
25 feet of water. Several streams drain into the loch, the principal ones 
being the Cuttiemore burn and the Ciittie Shallow burn, entering on the 
western side. The Pullaugh burn, flowing out at the northern end, is 
a broad quiet stream with a very gentle fall for a couple of miles. 
Temperature Observations . — The following serial taken in the deepest 
part of the loch showed a riinge from surface to bottom of only 4°*2 Fahr., 
the greatest fall being one of 1°*3 between 10 and 20 feet : — 
Surface ... 
60°-2 Fahr. 
10 feet . . . 
59°-8 „ 
20 „ ... 
58°-5 „ 
30 „ ... 
58°-0 „ 
40 „ ... 
57°*3 „ 
50 „ ... 
56°-8 „ 
65 „ ... 
56°-0 „ 
Loch Skerrow (see Plate XLIV 
). — Loch Skerrow lies between Loch 
Grennoch on the west and Woodhall Loch on the east, being about 2 miles 
distant from both, and 7 miles north of Gatehouse. The shores are 
rocky, with numerous scattered boulders, and the islands are mostly 
of rock, while stones are plentiful, especially towards the south ; a few 
small patches of yellow sand occupy the bays. The surrounding hills are 
low and bare, with much rock exposed, and strewn with boulders. The 
loch is subtriangular in outline, with the apex pointing south, and is 
nearly three-quarters of a mile in length, with a maximum breadth at the 
north end of half a mile, the mean breadth exceeding a quarter of a mile, 
