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'l at a depth of 7 feet. 



