THE FRESH-WATER LOCHS OF SCOTLAND. 
389 
area of over 200 feet to the west of this is three-quarters of a mile long, 
and has a maximum depth of 220 feet. The larger area of over 200 
feet is 2 miles long, and extends from just west of the narrows 
eastward. The area of over 250 feet lies well down the loch, coming 
to within 1^ miles of the outflow, and includes the maximum depth of 
the loch, 281 feet. The mean depth of the loch is 104 J feet. The 
proper basin of the loch terminates three-quarters of a mile from the 
lower end of the loch. At this point there is a bend at right angles to 
the main axis, and there extends a broad, tortuous, shallow section of 
the loch, with a greatest depth of only 43 feet, and numerous small 
islands. 
As is shown by the narrowness of the areas enclosed by the deeper 
contours, there is no marked indication of the U-shaped section of 
valley lochs excavated by glaciers. The promontory opposite the river 
Quoich, occurring where a great bend of the axis takes place, must 
have caused a narrowing here before the delta of the Quoich was laid 
down. 
On May 6, 1903, the difference of temperature between the surface 
and 150 feet was under 1° : — Surface, 41°-9 Fahr. ; 50 feet, 41°-2; 150 
feet, 41°-0. 
Loch Poulary (see Plate XCIV.). — ^A long, irregular, narrow loch 
running east and west in Olen Garry, between Loch Garry and Loch 
Quoich, about 4 miles distant from the former and 2 miles from the 
latter. It is little more than a series of expansions of the river Garry, 
and its limits are accordingly not easy to define. The portion surveyed 
begins at Eilean Dubh, extends eastward for 1 mile as a narrow channel 
varying from 9 feet to 23 feet in depth, and then expands into a little 
basin half a mile long by one-fifth of a mile in greatest breadth. The 
length of the whole loch is 1|^ miles, and the mean breadth one-tenth 
of a mile. The area of the surface is about 91 acres, and the drainage 
area, which includes Loch Quoich, is 82 square miles. The volume of 
water is 39 millions of cubic feet. The Allt a’ Ghobhain, a considerable 
stream, and some small burns, enter on the north shore. From spot- 
levels on the shores, the height of the loch above the sea was estimated 
to be 320 feet. The greater part of the loch is shallow, but in the 
eastern basin there is deeper water in the centre, forming, however, 
only a narrow channel. The maximum depth is 47 feet, the mean 
depth 10 feet. 
There was a difference of only 1° in temperature between the 
surface (53°-8 Fahr.) and a depth of 40 feet (52°-8) on September 28, 
1903. 
Loch Garry (see Plate XCV.). — Loch Garry is one of the most 
important lochs in the basin, being inferior in size only to Loch Ness 
