1907-8.] The Temperature Changes in Fresh- Water Lochs. 17 
even at the depth of 1000 feet there was a variation in temperature during 
the year of over a degree. In Loch Ness also variations in the temperature 
Fig. 11. — Loch Ness, 6 a.m., 17th September 1904. 
at great depths were observed, such as one would expect if there were 
currents reaching to the bottom of the loch. I may instance one striking 
VOL. XXVIII. 2 
