398 BATHYMETRICAL SURVEY OF 



volume of water is 123 millions of cubic feet. The drainage is chiefly 

 brought by the river Loyne, only small burns contributing a share, the 

 largest entering close to the outflow. 



The prominent points on both shores, and the large island, are 

 formed by mounds of boulders and gravel. The only rock seen was 

 at the very narrow channel, with a depth of only 2 feet, at the east end 

 of the largest basin. Here rock was exposed on both sides. The river 

 flows out between an alluvial flat on the north and mounds of glacial 

 debris on the south. The height above the sea was 706' 1 feet on 

 November 4, 1904. 



The temperature of the surface was 46-6 Fahr., and at 30 feet 46'2. 



Loch an Staca (see Plate CL). Loch an Staca is a considerable 

 minor loch, of roughly triangular form, situated on the extensive 

 elevated area which stretches westward from Loch Ness, between Glens 

 Moriston and Urquhart. It is 6 miles distant from Loch Ness. Its 

 longer axis lies nearly north-east and south-west. The undulating 

 moorland rises little above the loch, except on the east, where Meall 

 na Criche, 2224 feet in height, sends a long ridge southward between 

 Lochs an Staca and na Criche. 



Loch an Staca is estimated to be 1600 feet above the sea. It is 

 a mile long by two-fifths of a mile broad, with a mean breadth of a 

 quarter of a mile. The superficial area of the loch is about 163 acres, 

 or a quarter of a square mile, and the drainage area 1J square miles. 

 The volume of water is 110 millions of cubic feet. 



Loch an Staca receives only local surface drainage, and the overflow 

 is carried into Loch Liath by a small burn. The bottom is very uneven, 

 a depth of only 9 feet being found almost in the centre of the loch, 

 with deeper water on all sides. There is a small island close to the 

 west shore. A great part of the bottom, equal to 74 per cent, of 

 the total area, is covered by less than 20 feet of water. Four little 

 depressions occur. The deepest, with the maximum depth of 51 feet, 

 is close to the east shore; another of 32 feet lieS to the south-west 

 of this ; one of 30 feet close to the west shore north of the island ; and 

 one of 30 feet in the centre of the loch, near the north end. At this 

 end is another island. The mean depth is 15J feet. 



The surface temperature (June 2, 1904) was 56'5 Fahr. ; at a depth 

 of 25 feet it was 52-0, at 50 feet 48-9, a total range of 7-6. 



Loch Liath (see Plate CL). A little roundish loch about a mile 

 to the south of Loch an Staca, on the same plateau. It is about 100 feet 

 lower than Loch an Staca, the drainage from which it receives. The 

 axis of the loch has a north-east and south-west direction. It is barely 

 half a mile long by fully a quarter of a mile broad, with a mean breadth 

 of one-fifth of a mile. The superficial area is about 61 acres, and its 



