THE FRESH- WATER LOCHS OF SCOTLAND. 
23 
series taken in the deepest part of the loch at 3 p.m. showed that the 
water was practically uniform in temperature from surface to bottom : — 
Surface ... 
• •• 
• •• 
• •• 
. . . 
51°*4 Fahr. 
10 feet ... 
• •• 
51°-4 „ 
20 „ ... 
• •• 
51°-5 „ 
30 „ ... 
51°-5 „ 
50 „ ... 
... 
51°-5 „ 
80 „ ... 
... 
51°'2 „ 
In the nine lochs included in the foregoing table 681 soundings were 
taken, and the aggregate area of the water-surface is almost 5 square 
miles, so that the average number of soundings per square mile of surface 
is 141. The aggregate volume of water contained in the lochs is estimated 
at about 1319 millions of cubic feet. The area drained by these lochs 
is 1684 square miles, or nearly thirty-five times the area of the lochs. 
