410 
BATHYMETRICAL SURVEY OP 
50-feet area is very narrow, a quarter of a mile long, and a little east 
of the central line. 
The basin of Loch Garth, which was IJ miles long by nearly half a 
mile broad, is of irregular shape. The main part of the loch was 
oblong, but a long, curved, narrower part branched off to the south. 
The depth is now 91 feet (the maximum for Loch Mhor). The 25-feet 
contour almost coincides with the shore-line of the original loch. The 
50-feet contour encloses an area IJ miles in length, and enters the 
narrow southern branch. This area is broad for half a mile at the 
north end, but from there south it is a narrow channel. The 75 -feet 
area is one-third of a mile long, by one-fifth of a mile broad. The mean 
depth of the whole loch is 24 feet. 
T emperature Observations . — Series of temperatures were taken in 
Loch Garth on April 24, and in Loch Farraline on April 25. The 
higher temperature of Loch Farraline might be due merely to its 
being taken a day later, as the weather was warm : — 
Loch Garth, April 24, 
Loch Farraline, April 25, 
1903. 
1903. 
Surface 
42°-0Fahr. 
43° -5 Fahr. 
10 feeb... 
41°-8 „ 
43°-2 „ 
25 ,, ... 
. • . 9 9 • • * 
43°0 „ 
30 „ ... 
. . . 99 ... 
42° -4 „ 
40 „ ... 
41°*2 „ 
... 42°-0 „ 
55 „ ... 
— ,, 
42°-0 ,, ■ 
80 „ ... 
... 4r*2 „ 
• • • j i 
Loch Bran (see Plate XCI.). — Loch Bran is situated in the woods 
above Foyers, from which it is a mile distant. The shores are wooded, 
with rock showing in places a little way from the water’s edge. There 
are really two basins at the same level, separated by a narrow neck of 
land. The loch is very narrow, with the centre line strongly curved. 
Its length, measured in a straight line, is about three-eighths of a 
mile, measured round the curve, nearly three-quarters of a mile; the 
maximum breadth is one-fifth of a mile. The superficial area is about 
24 acres, and the volume of water 13 millions of cubic feet. The 
drainage area is only a quarter of a square mile; the loch receives no 
streams of any size. The east loch drains into the west loch, and that 
into the river Foyers by a burn half a mile long. The east loch is 
much the larger and deeper, but the deep area with a maximum of 
50 feet is only a little hole in the middle of the loch. The greatest 
depth in the west loch is 19 feet. The mean depth of the whole loch is 
12J feet. The temperature at the surface on April 30, 1903, was 48°*6 
Fahr. ; at 10 feet, 46°-2 ; at 20 feet, 45°*0; at 25 feet, 42°*3 ; and at 
50 feet, 42°-2. 
Loch a’ Choir e (see Plate CV.). — A little loch lying between Lochs 
