THE FRESH- WATER LOCHS OF SCOTLAND. 337 



loch (221 feet) on the other. Another line of soundings, about three- 

 quarters of a mile further east, shows a shoaling in deep water, where 

 a depth of 122 feet was recorded between a depth of 130 feet on one 

 side and 159 feet on the other. With these exceptions, the various 

 lines of soundings show a regular bottom, with a steep offshore slope 

 in some places along both the northern and southern shores. Thus, 

 proceeding along the northern shore from the east end of the loch, the 

 first line of soundings gave a depth of 40 feet at a distance of 20 feet 

 from shore; the fourth line of soundings gave a similar depth at a 

 similar distance ; the fifth line gave a depth of 28 feet at 10 feet from 

 shore; the ninth line gave 47 feet at 30 feet; the next line gave 21 

 feet at a distance of 20 feet ; the next line 84 feet at 60 feet distance ; 

 the next 35 feet at 25 feet distance; and the next line 36 feet at 30 

 feet distance. In like manner, proceeding along the southern shore from 

 the east end, the sixth line of soundings gave a depth of 76 feet at a 

 distance of 50 feet from shore; the next line gave 31 feet at 20 feet 

 distance; the next line 47 feet at 15 feet distance; the next line 33 

 feet at 20 feet distance ; and the next line 34 feet at 30 feet distance. 

 All these figures indicate a slope exceeding 1 in 1, and in one case a 

 slope exceeding 3 in 1. The following table gives the areas between 

 the consecutive contour-lines at intervals of 50 feet, with the per- 

 centages to the total area of the loch, the flat-bottomed character of 

 the basin being indicated by the larger zone on the deeper side of the 

 100-feet contour than on the shallower side: 



to 50 feet 195 acres 37 per cent. 



50,, 100 ,, 89 ,, 17 



100,, 150 125 24 



150,, 200 70 13 



Over 200 ,, 47 9 



526 , 100 ' 



Temperature Observations. A series of temperatures taken at 3 p.m. 

 on October 6, 1903, in the deepest part of the loch, gave the following 

 results : 



Surface 49-2 Fahr. 



10 feet 48-9 



25 48-6 



50 48-0 



100 47'0 



150 45-6 



200 44-8 



The extreme range shown by these observations is only 4-4 from 

 surface to bottom, the fall of temperature being very gradual. 



