THE FRESH- WATER LOCHS OF SCOTLAND. 5 



acres, or 13 per cent, of the area of the loch, while the area between the 

 coast-line and the 50-feet contour is nearly 550 acres, or 18 per cent, 

 of the area of the loch, so that 82 per cent, of the floor of the loch is 

 covered by over 50 feet of water. 



Loch A r filet (see Plate IV.). Loch Arklet drains into Loch Lomond, 

 but the corporation of the city of Glasgow have power, by the erection 

 of a dam at its west end, to divert the waters into the catchment- 

 basin of Loch Katrine, in order to increase the supply of water to the 

 city. The surface of this little moorland loch is, according to the 

 Ordnance Survey maps, 455 feet above sea-level. It has a total length 

 of over a mile, and a maximum width near the east end of nearly half 

 a mile. The mean breadth is about one-third of a mile, or 587 yards, 

 being 33 per cent, of the length. Its waters cover an area of about 

 210 acres (0'3 square mile), and it drains an area about sixteen times 

 greater, or about 3400 acres (5J square miles). The number of sound- 

 ings taken in Loch Arklet was 135, the average depth of these being 

 21 feet, and the greatest depth observed being 67 feet (11 fathoms). 

 The mass of water in the loch is estimated at 222,000,000 cubic feet, 

 and the mean depth at 24 feet, or 36 per cent, of the maximum depth. 

 The length of the. loch is 79 times the maximum depth, and 218 times 

 the mean depth. 



The wide eastern portion of Loch Arklet is shallower than the 

 narrower western portion. The 50-feet depression extends little more 

 than halfway towards the eastern end of the loch, and is slightly under 

 half a mile in length, the greatest depth (67 feet) being approximately 

 near the centre of the depression, and nearer the western than the 

 eastern end. The area of over 50 feet in depth is estimated at about 

 19 acres, or 9 per cent, of the area of the loch, while the area between 

 the 50-feet line and the shore is about 191 acres, or 91 per cent, of the 

 entire superficial area. 



Two small islands appear on the chart in the shallower part of the 

 loch towards the north-eastern end. 



Loch Achray (see Plate V.). This pretty little lake is situated at 

 the entrance to the Trossachs, and immediately before the windows of 

 the Trossachs Hotel. Loch Achray, the surface of which is, according 

 to the Ordnance Survey maps, 276 feet above sea-level, has a total 

 length of about 1J miles, with a maximum width of nearly one-third of 

 a mile. The mean breadth is about a quarter of a mile, or 458 yards, 

 being nearly 21 per cent, of the length. Its waters cover an area of 

 about 205 acres (one-third of a square mile), and the area draining into 

 it is twenty-two times greater, or about 4500 acres (7 square miles). 

 The number of soundings taken in Loch Achray was 171, and the average 

 depth of these was 36J feet, the maximum depth recorded being 97 



