THE FRESH- WATER LOCHS OF SCOTLAND. 
273 
portion of the loch between Port-in-Sherrich and Inistrynich — a stretch 
of over 12 miles in length — is less than 200 feet in depth, the deepest 
sounding recorded between these two places being 196 feet. The 300- 
feet contour encloses an area about Ij miles in length, less than 5 miles 
from the head of the loch, two soundings at the maximum depth of 307 
feet being recorded about half a mile apart. 
The following table, giving the approximate areas between the contour- 
lines drawn in at intervals of 100 feet, and the percentages to the total 
area of the loch, shows that considerably more than one-half of the lake- 
floor is covered by less than 100 feet of water : — 
Feet. 
Acres. 
Per cent. 
0 to 100 
5474 
57-6 
100 „ 200 
.. , ... 2900 
30-5 
200 „ 300 
1017 
10-7 
Over 300 
114 
1-2 
9505 
100-0 
Temperature Observations . — During the progress of the survey four 
series of temperatures were taken, which showed a total range throughout 
the whole body of water of only Fahr., as given in the following 
table : — 
Serial Temperatures in Loch Awe. 
Depth 
in feet. 
May 11, uortli-east of 
Rudha Gainmheine, 
ill 160 feet. 
May 21, between Port- 
sonachaii and Tay- 
clireggau, in 158 feet. 
May 9, off Lean 
Mara, in 153 feet. 
May 20, between Badan 
Tomain and Innis Cho- 
naiii, ill 163 feet. 
° Fahr. 
° Fahr. 
1 ° Fahr. 
° Fahr. 
0 
45-2 
46-1 
45-2 
47-1 
5 
— 
_ 
1 45-0 
— 
10 
— 
46-0 
44-4 
— 
15 
— 
— 
44-1 
— 
25 
— 
45-8 
44-1 i 
46-8 
50 
43-8 
45-6 
44-1 
45-1 
100 
43-8 
45-2 
43-9 
44-8 
150 
43-6 
— 
43-8 ' 
— 
155 
— 
44-9 
— i 
— 
160 
■ — ■ 
— 
44-4 
Duhli Locliaii (see Plate CXXYI.). — The name Dubh Lochan is applied 
to four little lochs lying about a mile south-east of Kingshouse. They 
are all weedy, and only the one lying farthest to the south-east was 
surveyed. It takes the form of a V with one limb pointing to the north, 
the other to the north-west. The length is a little over a quarter of a 
mile, and the superficial area about 17 acres. The maximum depth of 
10 feet was found about 150 yards from the end of the north limb. The 
volume of water is estimated at 2 million cubic feet, and the mean depth 
at nearly 3 feet. Dubh Lochan was surveyed on May 21, 1903, hut the 
level could not be determined ; the elevation given on the Ordnance Survey 
T 
