THE FRKSH-WATKR LOCHS OF SCOTLAND. 405 



depth, 24 J feet, and by the fact that two-thirds of the area of the loch is 

 less than 25 feet deep. Both ends are shallow beyond the two narrows 

 which constrict the loch, the deepest part in the north-east portion being 

 26 feet, and in the south-west portion 32 feet. Both the narrows are 

 20 feet deep. The central basin between the narrows is deep, and the 

 25-feet and 50-feet contours follow the shore and enter the west bay. 

 The greater part of the basin is over 25 feet deep, the 50-feet area being 

 nearly half a mile long, but narrow. The 75-feet basin is based on a 

 single sounding in 75 feet, the maximum depth of the loch. 



Loch nan Lann (see Plate XCL). A small loch of relatively great 

 depth, situated between Loch Knockie and Loch Ness, joined with Loch 

 Knockie by a short stream a quarter of a mile long. Loch nan Lann 

 lies due north and south, and is narrow towards the north and broad 

 towards the south end. There is a constriction in the middle of the 

 loch, with a small and shallow expansion to the north of it, and a broad 

 and deep basin to the south. The axis of the loch is considerably 

 curved. The east shore is wooded. The length is nearly three-quarters 

 of a mile, the greatest breadth one-third of a mile, and the mean 

 breadth about one-seventh of a mile. The superficial area is about 

 65 acres, and the contents amount to 105 millions of cubic feet. The 

 drainage area includes Loch Knockie, and amounts to 3| square miles. 

 It is fed chiefly by the burn from Loch Knockie. The outgoing stream 

 leaves the loch at the north extremity, and flows half a mile north- 

 westwards into Loch Ness. 



North of the narrows the loch is deeper close to the west shore, and 

 the greatest depth in this part is 41 feet. South of the narrows the 

 expanded portion is a regular and simple basin. The contours are 

 fairly concentric with the sides of the basin, the slope pretty uniform 

 all round, but rather more gradual from 25 to 50 feet. The narrow 

 100-feet area is an eighth of a mile long, and is a very little to the 

 south-west of the centre. The maximum depth is 109 feet. The loch 

 is approximately 645 feet above the sea. 



The temperature at the surface on April 24, 1903, was 42-0 Fahr. ; 

 at 15 feet, 41-8; at 25 feet, 41-3; at 50 feet, 41-0; and at 100 feet, 

 41-0, the whole range being 1. 



Loch Kemp (see Plate XCL). A small loch east of Loch Ness, 

 3 miles to the south of Foyers. It is of rather irregular form, roughly 

 oblong, with an arm running off to the north, and bays to the east and 

 west. The shore is entirely of rock, and it is surrounded by low hills. 

 The length is half a mile, the greatest breadth a quarter of a mile, the 

 mean breadth scarcely less (one-fifth of a mile). The superficial area 

 is about 68 acres, and the volume of water 77 millions of cubic feet. 

 The drainage area is 1J square miles. Two small burns enter to the 



