226 BATHYMETRICAL SURVEY OF 



Surface 55'5 Fahr. 



5 feet 55-5 



10 55-3 ,, 



20 55 -3 



30 ,, 55-2 ,, 



50 55'l 



60 ,, 54 C> 3 ,, 



70 ,, 50 0> 9 ,, 



This series shows that the temperature was practically constant 

 down to 50 feet, the fall being less than J, thence a fall of 0-8 between 

 50 and 60 feet, and then a rapid fall of 3 0> 4 between 60 and 70 feet. 



Loch Kernsary (see Plate XL VII.). Loch Kernsary is situated to 

 the north-east of Inveran, at the foot of Loch Maree, into which it 

 drains through the little Loch Poll Uidhe a' Chro' and the Inveran 

 river. There was no boat passage into Poll Uidhe a' Chro', and it was 

 found impossible to carry the boat across. The ground around Loch 

 Kernsary is low, except to the north, where Meall an Leathaid Dharaich 

 rises to over 400 feet. The island near the south-western shore in the 

 main portion of the loch is an artificial crannog, but nothing is known 

 of its history N 



Loch Kernsary was surveyed on July 25 and 26, 1902 ; the elevation 

 of the water-surface above the sea was determined, by levelling from 

 Loch Maree, as being 68'0 feet. The keeper stated that the water would 

 rise 2J feet above, and fall 1 foot below this level, but a drift-mark 

 was observed 8-4 feet above the surface of the water. 



Loch Kernsary is about 1 J miles in length, with a maximum breadth 

 of nearly half a mile, the mean breadth being about 350 yards. Its 

 waters cover an area of about 200 acres, and it drains directly an area 

 of nearly 7| square miles, but since it receives the outflow from Loch 

 Ghiuragarstidh, its total drainage area is over 8J square miles an area 

 27J times greater than that of the loch. The maximum depth of 93 

 feet was observed about 250 yards from the north-western extremity of 

 the loch. The volume of water is estimated at 333 million cubic feet, 

 and the mean depth at 38 feet. The breadth of the loch at the position 

 of the deepest sounding is ten times the depth. The shore development 

 is 2*51, and the insulosity 0*008. 



The floor of Loch Kernsary is rather irregular, there being two 

 25-feet areas and four 50-feet areas. The main 25-feet area extends 

 throughout the greater part of the loch, while the smaller one lies in 

 the south-western part of the loch. Three of the 50-feet areas are 

 enclosed by the main 25-feet area : the north-western one containing 

 the deepest water in the loch, the central one having a maximum depth 

 of 66 feet, and the south-eastern one a maximum depth of 69 feet, 

 therefore falling just below sea-level; the fourth 50-feet area, based 



