THE FRESH- WATER LOCHS OF SCOTLAND. 321 



LOCHS OF THE KINLOCH BASIN. 



THERE are two lochs to be dealt with here, viz. Loch Chaluim and 

 Loch an Dithreibh, the superfluent waters of which are carried into 

 the Kyle of Tongue by the Amhainn Ceann Locha (or Kinloch river). 

 Loch Chaluim is the only one of several small lochs in the basin which 

 could be sounded, and it flows by the Allt an Dithreibh into Loch an 

 Dithreibh. The two lochs form a complete contrast in outline and 

 conformation of the bottom. 



Loch Chaluim (see Plate LXXVI.). Loch Chaluim lies on the 

 south-western flank of Beiun Laoghal, little more than a mile from Loch 

 Cuil na Sithe in the Borgie basin. It is most irregular in outline and 

 in conformation, with one comparatively large island, and with weeds 

 obstructing many of the bays. Measured in a south-west and north- 

 east direction, it is about three-quarters of a mile in length, with a 

 maximum breadth of half a mile, its waters covering an area of about 

 96 acres. The maximum depth of 30 feet was observed in the extreme 

 western portion of the loch, the mean depth being estimated at 8 feet, 

 and the volume of water at 33 million cubic feet. The loch was 

 surveyed on September 29, 1902, but the elevation of the lake-surface 

 above the sea could not be determined. 



Loch Chaluim is on the whole shallow, only three soundings exceed- 

 ing 20 feet having been recorded in the most westerly expansion of the 

 loch. There are two 10-feet basins, the principal one extending from 

 the extreme west end of the loch to beyond the island, filling up the 

 south-western expansion of the loch to the south of the island, and 

 enclosing the deepest part of the loch, the smaller one lying in the 

 eastern and south-eastern expansions of the loch, and having a maximum 

 depth of 17 feet. The greater part of the lake-floor is covered by less 

 than 10 feet of water, equal to about 69 acres, or 72 per cent, of the 

 total area. 



Temperature Observations. A series of temperatures was taken in 

 the deepest part of the loch, with the following results : 



