THE FRESH-WATER LOCHS OF SCOTLAND. 
105 
Temperature Observations . — Temperature observations taken at 
6.30 p.m. in the deepest part of the loch gave the following results : — 
Surface 
5 feet 
10 „ 
15 „ 
25 „ 
50 ,, 
65 „ 
62° -3 Fahr, 
62° -0 ,, 
54° -2 „ 
52° -4 „ 
49° -0 ,, 
47° -4 „ 
47° -2 ,, 
This series shows a range of temperature from surface to bottom 
amounting to 15°T, the greatest fall being one of 7°*8 between 5 and 10 
feet, there being a further fall of 3°*4 between 15 and 25 feet. 
Loch of Drumellie (see Plate XXX.). — The Loch of Drumellie (or 
Marlee Loch) lies about a mile to the east of the Loch of Clunie, and is 
surrounded by cultivated ground, the fields sloping gently up on all 
sides. Its shores are stony or weedy, and the narrow portion leading 
to the outflow is quite choked up with weeds, except for an artificial 
channel about 4 feet deep leading to the landing-stage, where the burn 
flows out over a weir. Large yellow masses of decaying vegetable matter 
were floating everywhere. The loch is about seven-eighths of a mile in 
length, with a maximum breadth of nearly half a mile, the mean breadth 
being nearly one-third of a mile, or 37 per cent, of the length. Its waters 
cover an area of about 175 acres, or over a quarter of a square mile, and 
it drains directly an area of over square miles, but since it receives 
the outflow from the Loch of Clunie and from Hae Loch, its total 
drainage area is about 23 J square miles — an area 86 times greater than 
the area of the loch. Over 70 soundings were taken, the maximum depth 
observed being 58 feet. The volume of water contained in the loch is 
estimated at 221,902,000 cubic feet, and the mean depth at 29 feet, or 
50 per cent, of the maximum depth. The length of the loch is 78 times 
the maximum depth and 156 times the mean depth. The Loch of 
Drumellie forms a flat-bottomed basin, the bottom sinking in two 
places below the 50-feet line, with shallower water between. The 
south-eastern 50-feet basin is based upon two soundings of 51 feet, 
while in the north-western one the maximum depth of 58 feet was 
observed, situated less than a quarter of a mile from the west end 
of the loch. The average slope of the bottom is gentle, the steepest 
slope observed being about midway along the southern shore, where 
a sounding of 20 feet was taken about 100 feet from the shore, giving 
a slope of 1 in 5. The area of the lake-floor covered by less than 
25 feet of water is about 72 acres, or 41 per cent, of the total area of 
the loch ; that covered by water between 25 and 50 feet in depth is 
about 83 acres, or 47 per cent. ; and that covered by more than 50 feet 
of water is about 20 acres, or 12 per cent, of the entire area of the loch. 
