THE FRESH-WATER LOCHS OF SCOTLAND. 
155 
Ordnance Survey on August 26, 1870, the elevation was found to be 
73’7 feet above sea-level. The boatman stated that the water may rise 
2 feet above its level on September 20, 1902, and fall 3 feet lower, 
giving a range of 5 feet. Temperature observations gave 50°*5 at the 
surface, and 50°T at a depth of 7 feet. 
