222 BATHYMETRICAL SURVEY OF 



area 10J times greater, or nearly 2 square miles. The maximum 

 depth of 93 feet was observed about 300 yards from the eastern shore. 

 The volume of water contained in the loch is estimateU at 228 millions 

 of cubic feet, and the mean depth at 35| feet. The breadth of the 

 loch at the position of the deepest sounding is sixteen times the depth. 

 The shore development is 2*15, and the insulosity 0*014. 



The 25-feet area is continuous, passing to the north of the large 

 island. The 50- and 75-feet areas lie in the eastern part of the loch, 

 though there is one sounding of 50 feet in the extreme west. The 

 50-feet area has a length of nearly half a mile, and extends to within 

 40 yards of the eastern shore, while the 75-feet area is a quarter of 

 a mile in length. The areas between the consecutive contour-lines, 

 and the percentages to the total area of the loch, are as follows : 



to 25 feet 67 acres 45 '4 per cent. 



25,, 50 42 28-3 



50 75 20 13-3 



Over 75 , 19 , 12'5 



148 , 100-0 



The temperature of the surface water in Loch Garbhaig at 4 p.m. 

 on July 25, 1902, was 54 0> 9 Fahr., or nearly 4 warmer than that 

 observed in Lochan Fada, which lies at the same elevation; no serial 

 temperatures were taken. 



Loch Glair (see Plate XLIX.). Loch Clair is situated about three 

 miles to the south-west of Kinlochewe, at the head of Loch Maree. The 

 ground to the north and west rises to the heights of Beinn Eighe and 

 Sgurr Dubh, the lower ground being covered by moraines. It was 

 surveyed on July 24, 1902, and the elevation of the water surface above 

 the sea was determined by levelling from bench-mark as being 303' 1 

 feet. 



Loch Clair is over 1J miles in length, with a maximum breadth of 

 about 600 yards, the mean breadth being about 300 yards. Its waters 

 cover an area of about 160 acres (a quarter of a square mile), and it 

 drains directly an area of 6J square miles, but since it receives the 

 outflow from Loch Coulin its total drainage area is 20J square miles 

 an area 83 times greater than that of the loch. The maximum 

 depth is identical with that observed in Loch Garbhaig, viz., 93 feet, 

 and occurs about 150 yards from the eastern shore off Creag naRianaich. 

 The volume is estimated at 287 millions of cubic feet, and the mean 

 depth at 42 feet. The breadth of the loch at the position of the deepest 

 sounding is sixteen times the depth. The shore development is 2*01, 

 and the insulosity very small (O'OOl), there being only two small 

 islands in the loch. 



