168 BATHYMETRICAL SURVEY OF 



in length, the maximum breadth towards the northern end exceeding 

 a mile, while the mean breadth exceeds half a mile. Its waters cover 

 an area of nearly 2 square miles, and the area draining into it, in- 

 cluding Loch Ceo-Glas, is about 8J square miles. The maximum depth 

 of 205 feet was observed about a mile from the southern end, but 

 an isolated sounding in 200 feet was recorded about half a mile farther 

 north, with shallower water between these two deep soundings. The 

 volume of water contained in the loch is estimated at 4599 millions 

 of cubic feet, and the mean depth at 84J feet. The soundings indicate 

 generally a gentle shore-slope, the steepest gradient being observed off the 

 south-eastern shore at the widest part near the foot of the loch, where a 

 sounding in 66 feet was recorded about 120 feet from shore. The floor of 

 the loch is somewhat irregular, the contour-lines being in places sinuous 

 in character, and the cross lines of soundings, especially in the northern 

 half of the loch, show several undulations. Thus the third line of sound- 

 ings from the northern end, proceeding from the south-eastern shore, shows 

 a deepening of the water to 65 feet, then a shoaling to 4G feet, then a 

 deepening to 70 feet, before finally rising towards the opposite shore. 

 The fourth line of soundings from the northern end, across the widest part 

 of the loch, proceeding also from south-east to north-west, shows that the 

 water deepens to 115 feet, then shoals slightly to 112 feet ; deepens again 

 to 127 feet, shoals again to 96 feet ; deepens slightly to 99 feet, shoals 

 again to 65 feet ; and then deepens to 76 feet before finally rising on 

 approaching the shore. The next line of soundings (the fifth from the 

 northern end) shows a shoaling near the middle covered by 105 feet, the 

 water deepening on both sides to 122 feet and 140 feet respectively. The 

 next line of soundings (the sixth from the northern end) shows a shoaling 

 towards the south-eastern shore covered by 60 feet, the water deepening to 

 86 feet between it and the shore. The next line of soundings (the seventh 

 from the northern end) reveals a shoaling towards the middle of the loch, 

 which is the more conspicuous because it is in close proximity to one of 

 the deepest soundings in the loch. Proceeding from the south-eastern 

 shore, the soundings deepen gradually to a depth of 154 feet, then a 

 slight shoaling to 143 feet was recorded, followed by soundings in 179 feet 

 and then 200 feet, when the bottom rises towards the north-western shore. 

 The following table, giving the approximate areas between the contour- 

 lines and the percentages to the total area, shows a larger area in the zone 

 between 100 and 150 feet than in the shallower zone between 50 and 100 

 feet, 40 per cent, of the lake-floor being covered by more than 100 feet of 

 water : 



Feet. Acres. Per cent. 



Oto 50 441 ... 35-3 



50 100 310 ... 24-8 



100 150 317 ... 25-4 



150 200 180 ... 14-4 



Over 200 1 ... 0-1 



1249 100-0 



