92 BATHYMETRICAL SURVEY OF 



Allt na Breaclaich. It trends in a north and south direction, and is 

 extremely simple in outline and conformation ; it is oblong in outline, 

 and of nearly uniform width throughout. It is nearly three-quarters 

 of a mile in length, and over one-eighth of a mile in maximum breadth, 

 the mean breadth being one-tenth of a mile, or 14 per cent, of the 

 length. Its waters cover an area of about 47 J acres, and it drains an 

 area 16 times greater, or about 1J square miles. Over 40 soundings 

 were taken, the maximum depth observed being 39 feet. The volume of 

 water is estimated at 22,682,000 cubic feet, and the mean depth at 11 

 feet, or 28 per cent, of the maximum depth. The length of the loch is 

 99 times the maximum depth, and 350 times the mean depth. The 

 northern portion of the loch is shallow, and water deepening gradually 

 on proceeding southwards until the maximum depth is encountered 

 about one-eighth of a mile from the southern end, thence the water 

 shallows rapidly towards the south end. The 10-feet basin is about half 

 a mile in length, extending from near the south end to within one-sixth 

 of a mile from the north end. The 2 5 -feet basin is contained in the 

 southern half of the loch, and is about a quarter of a mile in length. 

 The area of the lake-floor covered by less than 10 feet of water is over 

 29 acres, or 62 per cent, of the entire 'area of the loch, while that covered 

 by more than 10 feet of water is over 18 acres, or 38 per cent., of which 

 8 per cent, exceeds 25 feet in depth. Lochan na Lairige was surveyed 

 on June 16, 1903 ; the surface of the water was estimated at about 1595 

 feet above the level of the sea. 



Lochs Daimh and Giorra. Lochs Daimh and Giorra, situated in the 

 wilds of Glenlyon, amid grand and mountainous scenery, are good 

 trouting lochs, but strictly preserved. Loch Daimh flows into Loch 

 Giorra by a short river, and the outflow from both lochs is carried into 

 the river Lyon by the Allt Conait. To the south, on the flanks of 

 Stuchd an Lochain, lies the small Lochan nan Cat, at an elevation of 

 over 2000 feet above the sea, which flows into the river between Lochs 

 Daimh and Giorra. It being reported that this little lochan was frozen 

 over a few days before the date of the survey of Lochs Daimh and 

 Giorra, it was visited in the hope of taking soundings through holes in 

 the ice, but the ice had disappeared. It was apparently shallow all 

 round the shore, except where there are screes from the cliffs, and, if 

 at all deep, it must be over a very limited area. The temperature of 

 the water was 53-0 Fahr., while a reading taken close under the crags 

 beside the snow gave 49- 8. 



Loch Daimh (see Plate XXVII.). Loch Daimh (or Damh) trends 

 in an east-and-west direction, being widest and deepest towards the west 

 end, narrowing and shallowing towards the east end. It is nearly a 

 mile in length, and nearly one-third of a mile in maximum breadth, 

 the mean breadth being nearly one-fifth of a mile, or 19 per cent, of 



