THE FRESH-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. 



Oto25 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 Araicli-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 H feet, giving a range in level of about 5 feet. 



Loch Araich-Lin is a shallow flat-bottomed basin, apparently in pro- 

 of being silted up. Along the western shore the water is shallower 



