THE FRESH-WATER LOCHS OF SCOTLAND. 
165 
where human remains were found in 1866. The loch is sub-elliptical in 
outline, trending in a south-west and north-east direction, and exceeds 
2 miles in length. It is widest in the northern portion, where the maximum 
breadth is two-thirds of a mile, narrowing towards the southern end, the 
mean breadth exceeding one-third of a mile. Its waters cover an area of 
about 540 acres, and it receives the drainage from about 12 square miles of 
the surrounding country. The maximum depth of 51 feet was observed 
over half a mile from the northern end and towards the western shore, 
but the mean depth is only about 12 J feet, nearly one-half of the lake-floor 
being covered by less than 10 feet of water. The deeper water (over 20 
feet in depth) lies in the wide northern portion of the loch, to the north 
and west of the island. The volume of water is estimated at 291 million 
cubic feet. 
The loch was surveyed on May 20, 1904, when the elevation was 
found to be 968*6 feet above the sea; the level determined by the 
Ordnance Survey officers on ApTil 4, 1866, was 969*4 feet above sea-level. 
The temperature of the surface water was 49°*6 F^ahr. 
Loch Allan (see Plate LXII.) lies about IJ^ miles to the north of 
Lochindorb, and is peculiar in outline, consisting of three distinct basins, 
separated by two narrows. The southernmost basin is the largest and 
deepest, having a maximum depth of 29 feet ; the central basin has a 
maximum depth of 7 feet, with a comparatively large island near the 
middle ; while the northernmost basin has a maximum depth of 10 feet, 
with a small island near the middle. The length of the entire loch is 
about half a mile, the southern and central basins trending nearly north 
and south, while the northern basin trends nearly east and west, its waters 
covering an area of about 22 acres, the volume of water being estimated at 
10 million cubic feet, and the mean depth at 10 J feet. The loch was sur- 
veyed on May 23, 1904, the elevation being estimated at about 900 feet 
above the sea. The surface temperature w^as 52°*0 Fahr. 
Loclian Tutacli (see Plate LXII.) lies about a mile north-west of Loch 
Allan, and about 2 miles north of Lochindorb. It is subcircular in out- 
line, and about a quarter of a mile in maximum diameter, with a superficial 
area of about 19 acres. The volume of water is estimated at 4 million 
cubic feet, and the mean depth at nearly 5 feet. The loch forms a simple 
basin, the deeper water (exceeding 10 feet) occiq^ying a central position, with 
a maximum depth of 1 6 feet. The bottom is covered with peaty mud and 
decomposing vegetable matter, from wffiich a strong smell emanates. The 
loch was surveyed along with Loch Allan on May 23, 1904, the surface 
temperature being 51°*6 Fahr. 
Loch Dallas (see Plate LXII.) lies about 8 miles south of Forres, at an 
elevation of over 1000 feet above the sea. It is nearly half a mile in 
length from north to south, by a quarter of a mile in maximum breadth. 
