THE FRESH-WATER LOCHS OP SCOTLAND. 189 



little Loch an Tairbeirt Stuadhaich, which is only separated from this 

 arm of Loch Scadavay by a narrow ridge. 



Two very short streams enter Loch Scadavay, conveying the overflow 

 of Lochs nan Eun and a' Bhuird, with the higher tributary lochs. The 

 Garbh-Abhuinn, the most considerable stream in this part of the island, 

 flows eastward from the north portion of the loch to Loch Garbh- 

 Abhninn, which drains through Lochs Skealtar and nan Geireann into 

 Loch Maddy. 



When surveyed on May 24 to 30, 1904, Loch Scadavay was 16' 15 feet 

 above sea-level; the Ordnance Survey found it to be 16'8 feet on June 11, 

 1875. 



A series of temperatures taken in the deepest part, May 30, 1904, 

 showed a total range of 11. The temperature at 25 feet was only 0> 6 

 higher than at the bottom, while from 25 feet to 10 feet there was a rise of 

 4-4, and from 10 feet to the surface of 6'0 : 



Surface 63-0 Fahr. 



10 feet 57-0 



25 52-6 



50 52-0 



Loch na Garbh-Abhuinn (see Plate LXXII.). A small loch (locally 

 known as Upper Skealtar), about one-third of a mile long by a quarter 

 of a mile broad. It is divided into two nearly equal portions by pro- 

 montories which nearly meet. The northern half has a depression 

 towards the east end, with a maximum of 20 feet. The south half is 

 entirely shallow, the deepest part only 7 feet. The strait between is only 

 4 feet deep. 



Loch na Garbh-Abhuinn Ard (see Plate LXXII.). In flood this is part 

 of Loch na Garbh-Abhuinn, but when we visited it there was a strong 

 current through the narrow part, though we could detect no difference of 

 level. This loch is so shallow that a boat can with difficulty get about 

 in it. An island occupies the middle of it. In fact, these two lochs are 

 only expansions of the river leading from Loch Scadavay to Loch Skealtar. 



Loch SJceaUar (see Plate LXXII.). A fairly large loch, nearly a mile 

 in length by half a mile in greatest breadth. It is of irregular outline, 

 and has many islands, but is nevertheless a simple basin. The contours 

 are affected by the islands, so that they do not follow the shore. The 

 deepest part, with the maximum of 42 feet, is in the middle of the loch, 

 between two islands. There is a second little depression of 40 feet a 

 little further west. The burn from Loch Garbh-Abhuinn, one-sixth of 

 a mile long, enters on the west. The outflow is by a little loch, which 

 was not sounded, leading to Loch nan Geireann. Loch Skealtar was 

 8*75 feet above sea-level on May 9, 1904; the Ordnance Survey found it 

 to be 8'5 feet on June 12, 1875. 



