THE FRESH-WATER LOCHS OF SCOTLAND. 
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the maximum of 29 feet, the central one 22 feet, and the eastern one 
16 feet. In the channel at the castle the depth is only 5 feet. The 
mean depth is nearly 10 feet, the area about 113 acres, and the volume 
47 millions of cubic feet. The drainage area measures 3| square miles. 
The Sandhill burn flows in at the north-east corner of the loch. The 
outflow, at the south-west corner, has been dammed up by a bank of 
stones in order to supply a mill lade; hut there is no sluice, and the 
overflow is divided between the two streams. The surface was 268’8 feet 
above sea-level on November 6, 1906. 
The temperature at the surface was 45°*5 Fahr., and at 25 feet 45°‘3. 
