THE FRESH- WATER LOCHS OF SCOTLAND. 277 



Surface 55-9 Fahr. 



5 feet 55-0 



10 50-5 



15 49-5 



25 47-0 



50 45-l 



75 45-0 



100 44-8 



180 44-l 



The range from surface to bottom was 11'8, the greatest fall being one 

 of 4-5 between 5 feet and 10 feet, or nearly 1 per foot of depth. 



Loch an Leoid (see Plate CXXIII.) lies about 2 miles north-west of Loch 

 Awe at Kilchrenan, and drains into the neighbouring Loch an Droighinn, 

 and thence into Loch Awe by the Kilchrenan burn. It is separated from 

 Loch Nant, distant about half a mile to the west, by a very low-lying 

 divide, little more than 100 feet above the lochs at its highest part. Loch 

 an Leoid is almost rectangular in outline, and trends in a north-east and 

 Bouth-wesfc direction, the length being half a mile, the maximum breadth a 

 quarter of a mile, and the superficial area about 73 acres. The greatest 

 depth of 84 feet was recorded near the southern end. The volume of 

 water is estimated at 114 million cubic feet, and the mean depth at nearly 

 36 feet. The loch was surveyed on May 22, 1903, the elevation on that 

 date being 602-2 feet above sea-level, nearly identical with that observed 

 by the Ordnance Snrvey officers on August 27, 1864, viz. 6U2'1 feet. The 

 basin is rather irregular ; across the centre of the loch there is a slight 

 shallowing, with deeper water both to the north and south, a sounding in 

 79 feet being recorded about 300 yards from the northern shore, and the 

 deepest sounding in 84 feet about 200 yards from the southern shore. 



Temperatures taken in the deepest part show a range of 2'2 Fahr. from 

 surface to bottom, the greatest fall being observed between 50 and 

 75 feet : 



Surface 48'5 Fahr. 



25 feet 48-2 



50 47'6 



75 46-3 



Loch an Droighinn (see Plate CXXIII.). Loch an Droighinn (or Loch 

 Wren) lies immediately to the east of, and runs parallel with, its neigh- 

 bour, Loch an Leoid. It is over half a mile in length, and covers an 

 area of about 50 acres. The maximum depth of 48 feet is centrally 

 placed, but rather nearer to the north end. The volume of water is esti- 

 mated at 32 million cubic feet, and the mean depth at nearly 15 feet. 

 The loch was surveyed on May 25, 1903, when the elevation was 601*65 

 feet above sea-level ; when determined by the Ordnance Survey officers 

 on August 27, 1864, the elevation was 601-0 feet above the sea. There 

 are two 20-feet basins, the one to the south of the central island having 



