THE FRESH- WATER LOCHS OF SCOTLAND. 407 
head of the glen, 6 miles south of Loch Killin, is Loch na Lairige, which 
was not visited. The height above sea-level is about 1044 feet. 
Loch Killin is of very moderate depth, with a flat bottom. More 
than half the area of the loch (58 per cent.) is covered by less than 
25 feet of water. The area over 25 feet in depth is all south of a 
little rocky point on the west shore, and is fully half a mile long, the 
contour following the shore closely. The area over 50 feet in depth, 
a quarter of a mile long, approaches close to the foot of the cliffs on 
the west, and the maximum sounding of 67 feet is not far from shore. 
The mean depth is 24 feet. 
FIG. 64. LOCH KILLIN, LOOKING SOUTH-EAST. 
(Photograph hy Mr. O. West. From “ Proc. Roy. Soc. Edin.,” by permission of the Council.) 
The temperature on April 24, 1903, was almost uniform throughout 
— surface, 36°-9 Fahr. ; 50 feet, 36°*8. 
Loch nan Losganan (see Plate CIII.). — A mere shallow pond with 
a maximum depth of 7 feet. It is narrowly triangular, its axis curved, 
and is narrow and elongate to the west. It lies about 4 miles south of 
Foyers on Loch Ness, and is connected by a small burn with the river 
Foyers. Though from its elongate form it is not quite the shortest 
in the Ness basin, in all other respects it is the smallest. In length 
it is nearly one-third of a mile, and its greatest breadth is one-tenth 
of a mile. The superficial area is only about 7 acres, its volume only 
1 million cubic feet, and its drainage area a quarter of a square mile. 
The temperature of the water on April 21, 1903, was 42°-8 Fahr. 
