THE FRESH-WATER LOCHS OF SCOTLAND. 261 



LOCHS OF THE LINNHE BASIN. 



IN the paper dealing with the lochs of the Lochy basin published in 

 the Geographical Journal in December, 1906, two lochs on the shores of 

 Loch Linnhe, Loch Lun da Bhra and Loch nan Gabhar, were included. 

 When sounding Loch nan Gabhar the surveyor was enabled to sound two 

 little lochans lying about 2 miles to the east, near the Corran narrows at 

 Ardgour, which proved to be relatively very deep. 



Lochan na h-Eaglais (see Plate CXX.). Lochan na h-Eaglais (or Church 

 Loch) is the smaller and shallower of the two, and sub-circular in outline, 

 about one-sixth of a mile in maximum diameter, and covering an area 

 of about 10 acres. It forms a simple deep basin, with a maximum depth 

 of 43 feet, the mean depth being estimated at 23 feet, or more than half 

 the maximum depth, and the volume of water at 10 million cubic feet. 

 The loch was surveyed on May 12, 1903, but the elevation could not be 

 determined. The following temperatures taken in the deepest part show 

 a range of only 2^o Fahr. : 



Surface 50 -0 Fahr. 



10 feet ; 48-5 



20 47-8 



40 47-5 



Lochan Eton Mhic Alastair (see Plate CXX.) is also sub-circular in out- 

 line, and a quarter of a mile in maximum diameter. There is a deep central 

 basin with a maximum depth of 74 feet near the south-eastern end, where 

 the slope is steep. The volume of water is estimated at 45 million cubic 

 feet, and the mean depth at nearly 40 feet, or more than half the maximum. 

 Considering its small area the loch is very deep, about 57 per cent, of the 

 lake-floor being covered by more than 40 feet of water. The loch was 

 surveyed on May 12, 1903, but the elevation could not be determined. 

 The floods of the previous February had left a drift-mark 5J feet above 

 the level at the time of the survey, when the water was near its lowest 

 level. The following temperatures taken in the deepest part of the loch 

 show a range from surface to bottom of 3'5 Fahr. : 



Surface 47 C '0 Fahr. 



10 feet ... 46-8 



25 46-3 



50 45-0 



65 43--5 



It is said to freeze over very seldom, aud then only in extremely frosty 

 weather. 



