THE FRESH-WATER LOCHS OF SCOTLAND. 
75 
depth. The length of the loch is 298 times the maximum depth, and 
652 times the mean depth. Loch* Dochart was surveyed on April 28, 
1902, and the level of the surface of the water was determined from 
Ordnance Survey bench-mark as being 513 feet above sea-level. The 
temperature of the surface water at 11.30 a.m. on that date was 50°’ 1. 
Loch luhhair (see Plate XX.). — Loch lubhair (or Nubhair) receives 
the outflow from Loch Dochart by a river considerably less than half a 
mile in length, so that they may almost be regarded as forming one lake. 
It affords fair trout-fishing, and the scenery round about is very 
beautiful. Loch lubhair is about IJ miles in length, with a maximum 
breadth of about one-third of a mile, the mean breadth being nearly 
one-sixth of a mile, or 12 per cent, of the length. Its waters cover an 
area of about 135^ acres, or over one-fifth of a square mile, and it drains 
directly an area of about 5| square miles; but, since it receives the 
outflow from Loch Dochart, its total drainage area is over 44^ square 
miles, or 212 times the area of the loch. Over 100 soundings were taken 
in Loch lubhair, and the maximum depth observed was 65 feet. The 
volume of water contained in the loch is estimated at 147,284,000 cubic 
feet, and the mean depth at 25 feet, or 38 per cent, of the maximum 
depth. The length of the loch is 110 times the maximum depth, and 286 
times the mean depth. Loch lubhair trends in a north-east and south- 
west direction, and is rather peculiar in outline, resembling somewhat 
the italic letter /, constricted in the central portion, where a ridge crosses 
the loch with a maximum depth of 36 feet on it. The loch widens and 
deepens on each side of this constriction, the maximum depth of the 
loch having been found in the north-eastern part, where the loch is 
widest, the greatest depth observed in the south-western part being 
49 feet. The 25-feet basin is a continuous area over a mile in length, 
approaching close to the northern shore, but distant about a quarter 
of a mile from the south-west end. The area of the lake-floor covered 
by less than 25 feet of water is about 72 acres, or 53 per cent, of the 
total area of the loch ; the area between the 25- and 50-feet contours is 
about 59 acres, or 44 per cent., while the area covered by over 50 feet 
of water is about 5 acres, or 3 per cent, of the entire area of the loch. 
Loch lubhair was surveyed at the same time as Loch Dochart, on April 
28, 1902, the level of its surface being a foot lower than that of Loch 
Dochart, viz. 512 feet above the level of the sea. 
Loch Earn (see Plate XXII.). — Loch ‘Earn is situated amid lovely 
surroundings, the hills on both sides being clothed with rich woods, and 
splendid mountain scenery bounds the horizon towards the west, while 
on the south Ben Vorlich towers to a height of 3200 feet. It contains 
trout and salmon, and also Salmo ferox. It has been said that the loch 
is 100 fathoms ( = 600 feet) deep in some places, but this is disproved by 
