172 BATHYMETRICAL SURVEY OF 



75 feet of water, while only 15 per cent, is covered by water between 50 

 and 75 feet in depth. 



Serial temperatures taken in the position of the deepest sounding on 

 August 12, 1904, showed a range from surface to bottom amounting to 

 15 Fahr., the fall between 25 and 50 feet being equal to about half a degree 

 per foot of depth, the readings being : 



Surface 62 0> 5 Fahr. 



10 feet 62-4 



25 61-5 



35 ... 56-5 



50 49-3 



88 47'5 



Kilcheran Loch (see Plate LXV.) is half a mile in length, and covers 

 an area of 28 acres. At the northern end there is a narrow prolongation, 

 which could not be sounded because it was found impossible to get a boat 

 through the reeds at the narrows. The main body of the loch forms a 

 simple basin, the water deepening gradually on proceeding from the 

 southern end until the maximum depth of 60 feet is met with about 

 a quarter of a mile from the two ends. The mean depth is estimated at 

 21 feet, and the volume of water at 26 million cubic feet. Temperatures 

 taken on August 13, 1904, gave the following results : 



Surface 59-4 Fahr. 



10 feet 59-8 



30 59-5 



60 50-5 



There was heavy rain at the time, and for 10 hours previously, which 

 may account for the uniform temperature from the surface to 30 feet ; 

 between 30 and 60 feet a fall of 9 was recorded. 



Loch Fiart (see Plate LXV.) is nearly two-thirds of a mile in length, 

 and covers an area of about 33 acres. The maximum depth of 58 feet was 

 recorded less than a quarter of a mile from the southern end. The longitu- 

 dinal line of soundings shows a slight irregularity of the lake-floor, for, 

 proceeding from the northern end, the water deepens gradually to 48 feet, 

 then shoals to 36 feet, whence the water deepens again to the point of 

 maximum depth. The volume of water is estimated at 34 million cubic 

 feet, and the mean depth at 23 feet. 



