THE FRESH-WATER LOCHS OF SCOTLAND. 
117 
or two minor undulations. The axis of maximum depth lies towards the 
western shore, off which the slope is in places steep. The deepest part, 
exceeding 40 feet in depth, is situated over a mile from the upper end, 
and over half a mile from the outflow. About 28 per cent, of the lake- 
floor is covered by less than 10 feet of water, a rather larger area (about 
34 per cent.) being covered by water between 10 and 20 feet in depth. 
Temperature Observations . — -The following serials were, taken in the 
deepest part of the loch 
Surface ... 
63°*4 Fahr. 
10 feet ... 
62°-8 „ 
20 „ ... 
59^-4 „ 
30 „ ... 
58°*2 „ 
45 „ ... 
56°*0 „ 
The range from surface to bottom was 7°*4, the greatest fall being one 
of 3°'4 between 10 and 20 feet. 
Loch Dungeon (see Plate XLIV.). — Loch Dungeon lies about 6 miles 
south of Loch Doon, and a similar distance east of Dairy. Hills rise 
steeply on the south side, and rugged crags at the west end, culminating 
in Millfire (2350 feet) and Meikle Millyea (2446 feet). The general 
trend is from west to east, the loch curving round a large peninsula called 
the Point of Kingreoch. It is nearly a mile in length, with a maximum 
breadth of a quarter of a mile, the superficial area being about 88 acres. 
The loch drains an area of 2| square miles, the principal feeder being the 
Hawse burn, entering near the west end, while a few minor streams flow 
from the steep slopes of the hills to the west and south-west. The loch is 
divided into three deep basins, the deepest situated at the west end, where 
the slope is steepest, the maximum depth of 94 feet having been recorded 
less than 150 yards otf the western shore; the basin second in importance 
lies at the east end, and has a maximum depth of 45 feet, while near the 
centre of the loch is the smallest basin, having a maximum depth of 34 
feet. About 73 per cent, of the lake-floor is covered by less than 25 feet 
of water. The mean depth is estimated at 22 J feet, and the volume of 
water at 87 million cubic feet. The loch was surveyed on August 6, 1903, 
when the elevation was 1002*3 feet above the sea; a storm-beach was 
observed 4 feet above the water, which might fall about a foot lower. The 
southern and western shores are mostly of rock, with alluvial cones laid 
down by the bums. The main inflow, at the west end, cuts through a long 
sharp ridge of gravel, which abuts on the steep crags on the south, and 
joins a ridge of rock on the north. The outflow falls several feet in about 
100 yards, and passes first between and over boulders, and then over 
rock. The water in the loch had a peculiar leaden or greenish-grey 
slate colour. 
Temperature Observations . — Serial temperatures taken in the eastern- 
most basin gave identical readings of 54°*8 Fahr. at the surface, at 10 
