THE FRESH -WATER LOCHS OF SCOTLAND. 
171 
shallow water. The 2 5 -feet contour-line follows approximately the 
outline of the arm, and the 50-feet area is considerable, the maximum 
depth being 66 feet in the eastern part of the basin. 
The areas between the consecutive contour-lines, and the per- 
centages to the total area of the loch, are as follows : — 
0 to 50 feet 
672 acres 
50-2 per cent. 
50 „ 100 „ 
422 „ 
31*7 „ 
100 „ 150 „ 
m „ 
12-7 
150 ,, 200 ,, 
68 „ 
5-0 
Over 200 ,, 
5 ,, 
0*4 „ 
1338 ,, 100-0 
Loch Skinaskink was surveyed on September 19 to 23, 1902. The 
elevation of the lake-surface above the sea on commencing the survey 
on September 19, 1902, was determined, by levelling from bench-mark, 
as being 245-1 feet; when levelled by the Ordnance Survey officers on 
August 13, 1870, the elevation was 242*7 feet above sea-level. The 
highest drift-mark seen was 3| feet above the surface of the water. 
T emperature Observations . — ^Temperature observations taken in the 
deepest part of the loch at 4 p.m. on September 20, 1902, gave the 
following results : — 
Surface 
10 feet 
25 „ 
50 ,, 
100 ,, 
125 „ 
150 ,, 
170 
54 ' 
54° 
54° 
54° 
53° 
50° 
50° 
49' 
2 Fahr. 
2 „ 
0 ,, 
0 
3 „ 
1 ,, 
This series shows a range of temperature amounting to 4°-6, the greatest 
fall being one of 3°-2 between 100 and 125 feet. 
