THE FRESH- WATER LOCHS OF SCOTLAND. 
269 
From the table on page 268 it will be seen that in the ten lochs under 
consideration 2593 soundings were taken, and that the aggregate area 
of the water-surface is 29J square miles, so that the average number of 
soundings per square mile of surface is 88. The aggregate volume of 
water contained in the lochs is estimated at 93,410 millions of cubic feet. 
The area drained by these lochs is 318 square miles, or eleven times the 
area of the lochs. 
