THE FRESH- WATER LOCHS OF SCOTLAND. 323 



line a strikingly sinuous character. The 100-feet area has a length 

 of three-quarters of a mile, approaching comparatively very close to 

 the southern shore, where a sounding in 115 feet was recorded about 

 150 yards off shore. The 125-feet area exceeds half a mile in length, 

 and the small 150-feet area, based upon soundings of 151, 152, and 157 

 feet, occupies an approximately central position. Along the eastern 

 shore the slope of the bottom is in places very steep. Off Creag na 

 Luath-ghaire a sounding of 40 feet was taken about 80 feet off shore, 

 and another so'unding in 49 feet about 70 feet off shore, while off Creag 

 an Dithreibh one sounding was taken in 65 feet about 100 feet off shore, 

 and another sounding in 65 feet about 60 feet off shore. This last- 

 mentioned sounding gives an angle of slope exceeding 45, the fall 

 exceeding 1 foot per foot. The areas between the consecutive contour- 

 lines at equal intervals, and the percentages to the total area of the 

 loch, are as follows: 



to 50 feet 204 acres 42*9 per cent. 



50,, 100 150 31-4 



100,, 150 113 23-9 



Over 150 . 9 , 1'8 



476 ,, 100-0 



Temperature Observations, A series of temperatures taken in the 

 deepest part of the loch on the date of the survey gave the following 

 results : 



Surface 54'0 Fahr. 



25 feet 53'5 



50 53-0 



100 52-5 



125 - ... 48-6 



145 48-4 



This series shows a range of 5'6 from surface to bottom, the greatest 

 fall of temperature occurring beyond the depth of 100 feet a fall 

 equal to about 4 between 100 and 125 feet. 



