THE FRESH-WATEE LOCHS OF SCOTLAND. 
67 
Temperature Observations , — Serial temperatures were taken in the 
deepest part of the loch at noon on August 19, 1904, with the following 
results ; — 
Surface ... 
59°-5 Fahr. 
25 feet ... 
59°-0 „ 
50 „ ... 
57°-0 
56 „ ... 
54°-0 „ 
62 „ ... 
52°-6 „ 
75 „ ... 
50°-2 „ 
110 „ ... 
... 
48° -5 „ 
The total range from surface to bottom was 11°, the greatest fall being 
one of 3° between 50 and 56 feet — a fall equal to half a degree per foot 
of depth. 
Loch Tehrnait (see Plate XXV.). — Loch Tearnait (or Ternate) lies 
about 4 miles south-east of Loch Arienas, and less than 3 miles east of 
the head of Loch Aline. The loch trends almost east and west, and is 
nearly three-quarters of a mile in length, with a maximum breadth of over 
one-third of a mile. Its waters cover an area of about 106 acres, and the 
drainage area exceeds 4 square miles. The volume of water is estimated 
at 75 million cubic feet, and the mean depth at 16 feet. At the east end 
there is a small island at the entrance of the main inflow, and near the 
middle of the loch there is another small island. The deepest part of the 
loch lies to the west of this island, the maximum depth of 39 feet having 
been found about midway between it and the west end. To the east and 
south-west of this island soundings in 24 to 28 feet were taken. The loch 
was surveyed on August 18, 1904, but the elevation above the sea could 
not be determined; judging from spot-levels it is apparently about 460 
feet above sea-level. Temperatures taken in the deepest part of the loch 
showed a range of less than 2° Fahr. from surface to bottom : — 
Surface 59°;5 Fahr. 
25 feet 58°-0 „ 
37 „ 67°-6 „ 
