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 My re 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 



