THE FKESH-WATER LOCHS OF SCOTLAND. 179 
line along the centre line to near both ends. The temperature on June 30, 
1904, had a range of 3°-2, viz. — 
Surface 59°-2 Fahr. 
20 feet 58°-2 „ 
35 „ 56°-0 „ 
Loch Hermidale (see Plate LXVIII.). — Loch Hermidale is the middle 
loch of the chain of three lochs which were surveyed in the Haka basin. It 
is of irregular form, broadest in the middle and tapering to each end. Its 
long axis, somewhat curved, runs nearly north and south. It is surrounded 
by low moorland and has rocky shores. It receives the burns coming from 
Loch Aiiscot and from many little lochs to east and west, and overflows 
into Loch na Deighe fo Dheas. It is fully three-quarters of a mile long, 
a quarter of a mile broad, and one-eleventh of a mile in mean breadth. 
The broad central part of the loch forms a simple basin, with the 
maximum depth of 41 feet; a lesser basin to the north is 1(3 feet deep in 
the centre ; the long narrow part running south towards Loch Aiiscot is 
irregular, with islands and boulders, and has various holes of from 15 to 18 
feet deep. The mean depth is 12| feet. The superficial area is 54 acres, 
and the volume 29 millions of cubic feet. The drainage area, which 
includes Loch Aiiscot and many smaller lochs, is just about a square mile. 
On June 30, 1904, the surface was 8*7 feet above the sea. The tempera- 
ture was almost uniform throughout, viz. — 
Surface 59°’2 Fahr. 
20 feet 59°-0 „ 
35 „ 58°-8 „ 
Loch na Deighe fo Dheas (see Plate LXVIII.) is the northernmost 
loch of the Haka basin surveyed, lying close to the base of Kueval, the 
highest hill in Benbecula, on its east side. It is of comparatively simple 
oblong form, its long axis running north and south. There is a consider- 
able inflow from lochs both to north and south. The outflow is by a 
stream half a mile long, issuing from the east side into the Oban Haka, a 
branch of Loch Uskavagh. The surrounding country is low moorland, 
except where Rueval rises to the west, the shores almost entirely rock, here 
and there covered by mounds of gravelly debris with boulders. The out- 
flowing stream is bounded by rocks on both sides The loch is fully half 
a mile long by a quarter of a mile broad, with a mean breadth of one- 
eighth of a mile. The basin is a simple one, with the maximum depth of 34 
feet near the centre, and the bottom sloping gently to the centre. The 
southern bay is nearly flat and about 8 feet deep. The long inlet running 
north has a depth of 9 feet at its mouth and 18 feet within. The mean 
depth is 10| feet. The area of the surface is 52 acres, and the volume of 
water 24 millions of cubic feet. The drainage area is 1| square miles. 
On June 30, 1904, the surface was 7‘5 feet above the sea. The tempera- 
ture varied only 0°*2 of a degree from the surface, which was 59°*7 Fahr., 
to a depth of 30 feet. 
