80 BATHYMETRICAL SURVEY OF 



15 and 20 feet a fall of 5'4 in the 5 feet of water, or more than 1 per 

 foot of depth. 



Loch a' Ghaoruinn (see Plate XXXI.) is a small shallow loch, lying over 

 half a mile to the south-west of Loch Dnbh-mor ; weeds are abundant, and 

 the bottom is covered by a peaty mud. The loch is irregular in outline, 

 trending east and west, and one-third of a mile in length, with a maximum 

 breadth across the middle of one-seventh of a mile. The area is about 

 18 acres, of which 60 per cent, is covered by less than 10 feet of water. 

 The eastern portion is shallow, the deeper water lying in the western half, 

 two soundings at the maximum depth of 20 feet being recorded, one in 

 a central position, and the other near the west end. The volume is 

 estimated at 7 million cubic feet, and the mean depth at 9^ feet. The 

 elevation could not be determined, but is apparently about 860 feet above 

 the sea. On June 5, 1903, the surface temperature was 59'2 Fahr. 



Loch a' Phearsain (see Plate XXXL). Loch a' Phearsain (variously 

 spelt Phearson, Pearsan, or Fearsan, or Parson's Loch) is situated close to 

 Kilmelfort, at the head of Loch Melfort, and is nearly rectangular in 

 outline, with a slight curve in the eastern shore-line, which causes a 

 narrowing near the middle, where a shallow ridge crosses the loch. It 

 trends almost north and south, and is nearly half a mile in length, with a 

 maximum breadth of a quarter of a mile. The central ridge divides 

 the loch into two basins, the maximum depth of 53 feet being found 

 in the southern basin towards the eastern shore, the maximum depth 

 in the northern basin being 41 feet. The superficial area is about 61 acres, 

 of which about 36 per cent, is covered by less than 10 feet of water, while 

 10 per cent, is covered by more than 40 feet of water, the mean depth 

 being 19 J feet. The loch lies in a rock-basin, and contains about 

 52 million cubic feet of water, the area draining into it being about 3J 

 square miles. The loch was surveyed on May 30, 1903, when the eleva- 

 tion was found to be 226-0 feet above the sea. The temperature of the 

 surface water was 60'2 Fahr. 



Loch nan Druimnean (see Plate XXXI.). Loch nan Druimnean (or 

 Drimnin) is situated near the head of Loch Melfort, less than half a 

 mile to the west of Loch a' Phearsain. It is a narrow loch, trending 

 nearly north and south, and exceeding half a mile in length, its waters 

 covering an area of about 37^ acres. The maximum depth of 59 feet was 

 observed near the middle of the loch. The volume of water is estimated 

 at 26 million cubic feet, and the mean depth at 15^ feet. The loch was 

 surveyed on May 30, 1903, when the elevation was 169*3 feet above the 

 sea ; when visited by the Ordnance Survey officers on October 5, 1864, the 

 elevation was 170'1 feet above sea- level. A shallow ridge crosses the loch 

 towards the northern end, dividing it into two deep basins, the smaller 

 basin at the north end having a maximum depth of 30 feet, while the 



