THE FRESH- WATER LOCHS OF SCOTLAND. 173 



is not quite so simple in conformation as the eastern one, the 100-feet 

 area having a central constriction in its outline with deeper water on 

 both sides. The 50-feet area is 1J miles in length, approaching to 

 within 200 feet of the western end of the loch. The 100-feet area is 

 nearly a mile in length, with a depth of 103 feet in the central con- 

 striction, deepening to 130 feet to the west, and 146 feet to the east, 

 of the constriction. The areas between the consecutive contour-lines, 

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



to 50 feet 352 acres 43 '6 per cent. 



50,, 100 306 ,, 38-0 



100,, 150 145 18-0 

 Over 150 , 4 , 0*4 



807 100-0 



Loch Lurgain was surveyed on September 5 and 9, 1902. The 

 elervation of the lake-surface above the sea could not be determined, 

 but when levelled by the Ordnance Survey officers on August 9, 1870, 

 the level was found to be 173-0 feet. 



Temperature Observations. Temperature observations were taken 

 in the deepest part of the loch at 3 p.m. on September 9, 1902, with 

 the following results: 



Surface 56'l Fahr. 



50 feet 55-5 ,, 



100 , 52-0 



140 50-3 



This series shows a range of temperature amounting to 5 0- 8, there being 

 a fall of 3-5 between 50 and 100 feet. The range was greater than 

 that observed in any other loch in the district, even in Lochs Assynt, 

 Skinaskink, and Bad a' Ghaill, which are all deeper than Loch Lurgain. 



Lock Bad a' Ghaill (see Plate XLI.). Loch Bad a' Ghaill (or 

 Baddegyle) lies immediately to the north-west of Loch Lurgain, with 

 which it is connected by the little Loch Bada na h-Achlaise, and about 

 1J miles to the south-east of Enard Bay. The ground to the north and 

 west is comparatively low, An Stac and An t-Sail rising to the east and 

 south. The loch is over 2 miles in length, with a maximum breadth of 

 three-quarters of a mile, the mean breadth being nearly half a mile. 

 Its waters cover an area slightly exceeding one square mile, and it 

 drains directly an area of 4| square miles, but since it receives the 

 outflow from Loch Lurgain its total drainage area is over 17 square 

 miles. Over 150 soundings were taken, the maximum depth observed * 

 being 180 feet. The volume of water is estimated at 1,767,582,000 

 cubic feet, and the mean depth at 62 feet. Loch Bad a' Ghaill is cut 



