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 29^ 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 93,41 o millions of cubic feet. 

 The area drained by these lochs is 318 square miles, or eleven times the 

 area of the lochs. 



