THE FEESH- WATER LOCHS OF SCOTLAND. 7 
officers on June 10, 1870, the elevation of the lake-surface was found to 
be 770*0 feet above sea-level. 
Loch Leum a’ Chlamhain consists of two deep basins placed respectively 
towards the two ends of the loch, separated by shallower water near the 
central part of the loch. The separation does not, however, coincide with 
the narrowest part of the loch, in which a depth of 30 feet was found, but 
occurs farther to the south, where the greatest depth recorded was 24 feet. 
The 10-feet and 20-feet contour-lines enclose continuous areas, but the 
deeper contours enclose the two deep basins referred to. The smaller 
but deeper basin lies near the southern end of the loch, the deepest 
sounding of 51 feet having been recorded about 350 yards from the 
southern shore, while the larger basin lies towards the northern end, the 
greatest depth therein (50 feet) having been recorded about 600 yards 
from the northern shore. The areas between the consecutive contour- 
lines, and the percentages to the total area of the loch, are as follows : — 
Feet. 
Acres. 
Per cent. 
0to25 
254 
72-7 
25 „ 50 
90 
25-7 
over 50 
6 
1*6 
350 
100*0 
Temperature observations on the date of the survey gave identical 
readings of 46°*0 Fahr. at the surface, at 10 feet, at 20 feet, and at 40 feet. 
Loch Araich-Lin (see Plate II.). — Loch Araich-Lin (or Arichlinie or 
Ari-cliny) is situated about three-quarters of a mile to the south-west of 
Loch an Euathair, and about 3j miles to the south-east of Loch Leum a’ 
Chlamhain. It contains trout and char, but the fishing is preserved. It is 
a shallow lake, trending nearly north and south, and three-quarters of a 
mile in length by one-third of a mile in maximum breadth, while the mean 
breadth is a quarter of a mile. Its waters cover an area of about 117 
acres, and it drains directly an area exceeding 10 square miles, but since it 
receives the outflow from Lochs Leum a’ Chlamhain and Coire nam Meann, 
its total drainage area is about 15 square miles — an area eighty times 
greater than that of the loch. The maximum depth of 7 feet was observed 
in several places in the southern portion of the loch and along the eastern 
shore. The volume of water is estimated at 23 million cubic feet, and the 
mean depth at 4| feet. The loch was surveyed on October 3, 1902, when 
the elevation of the lake-surface was found by levelling from bench-mark 
to be 451*8 feet above the sea; when visited by the Ordnance Survey 
officers on July 27, 1869, the elevation was 451*4 feet above sea-level. The 
highest drift-mark observed on the date of the survey was about 3j feet 
above the surface of the water, and the local boatman stated that the 
water might fall about ll feet, giving a range in level of about 5 feet. 
Loch Araich-Lin is a shallow flat-bottomed basin, apparently in pro- 
cess of being silted up. Along the western shore the water is shallower 
