THE FRESH-WATER LOCHS OF SCOTLAND. 
Ill 
take a boat. The smaller western portion is mostly overgrown by weeds, 
with a very little open water, and never entirely freezes over, owing 
probably to the existence of numerous springs. Monk Myre is over 
half a mile in length, with a maximum breadth of over one-seventh of a 
mile, the mean breadth being about one-thirteenth of a mile, or 14 per 
cent, of the length, and its waters cover an area of about 25 acres. Over 
30 soundings were taken, and the maximum depth observed was 12 feet. 
The volume of water is estimated at 5,552,000 cubic feet, and the mean 
depth at 5 feet, or 42 per cent, of the maximum depth. The loch is 
a shallow basin with rather uneven floor ; the deepest part is towards 
the northern shore, where neighbouring soundings of 10 and 12 feet 
were taken, the remaining soundings being under 10 feet. The area 
of the lake-floor covered by less than 10 feet of water is equal to 98| 
per cent, of the total area. Monk Myre was surveyed on June 20, 1903, 
but its elevation above the sea could not be ascertained. Temperatures 
taken at 7 a.m. gave 55°*8 at the surface and at a depth of 10 feet. 
Long Loch and Pitlyal Loch form the headwaters of the Dighty 
burn, which flows eastward and enters the estuary of the Tay at 
Monifieth ; a burn flows from Long Loch to Pitlyal Loch. 
Long Loch (see Plate XXX.). — The Long Loch is bordered on the 
west by steep, grassy hills, while the eastern shore is low and wooded. 
No burns of any size enter the loch, but there are many springs on 
the hillside to the west. It contains pike and perch. The outflow is 
artificial, by dam and sluice ; but at the time of the survey the water 
was very low, and very little water was flowing out at the sluice. The 
dotted line on the map shows approximately the shore-line on the date 
of the survey, and the water would have to rise 4J feet to reach the 
overflow. Long Loch trends in a north-east and south-west direction, 
and is very peculiar in outline, presenting a close resemblance to a dog’s 
body and head without legs, the portion represented by the dog’s nose 
being filled with weeds. It is nearly three-quarters of a mile in length, 
with a maximum breadth of over a quarter of a mile, the mean breadth 
being one-sixth of a mile, or 24 per cent, of the length. Its waters 
cover an area of about 74 acres. Over 50 soundings were taken, the 
maximum depth observed being 42 feet. The volume of water contained 
in the loch is estimated at 31,893,000 cubic feet, and the mean depth 
at 10 feet, or 24 per cent, of the maximum depth. The length of the 
loch is 88 times the maximum depth, and 373 times the mean depth. 
Generally speaking, the loch forms* a simple basin, with a few minor 
undulations of the bottom, and the slope is steeper off the western 
than off the eastern shore. The maximum depth of 42 feet was observed 
near the centre of the loch, but considerably nearer the western than 
the eastern shore. In this locality the slope is moderately steep, a 
sounding of 12 feet being recorded about 50 feet from the shore, giving 
