312 BATHYMETRICAL SURVEY OF 



shows how the bottom rises and falls on proceeding from one end of 

 the loch to the other. The 25-feet contour-line is discontinuous opposite 

 the entrance of the Allt Gruama Beag, where the deepest sounding was 

 24 feet, the water deepening both to the east and to the west. The 

 50-feet contour is continuous, enclosing an area nearly 4 miles in length, 

 distant from the east end about 1| miles, and approaching to within 

 one-third of a mile from the west end ; within this area, however, the 

 bottom rises in two places, where soundings of 40 and 43 feet were 

 taken. There is a small isolated 75-feet area opposite Carn Gruama 

 Beag, based on soundings of 76 and 80 feet, separated from the principal 

 75-feet basin by an interval of over a quarter of a mile, in which the 

 greatest depth is 62 feet; the main 75-feet area is 2J miles in length, 

 and approaches to within three-quarters of a mile from the west end. 

 There are two very small 100-feet areas, based upon isolated soundings 

 of 100 and 108 feet, the former opposite Gruamamor, the latter farther 

 up the loch west of Reidhachaisteil. A short distance to the west of 

 the deepest sounding (108 feet) is a rise of the bottom covered by 40 

 feet of water already mentioned, and to the north-east near the northern 

 shore is a bank covered by only 1 foot of water surrounded by much 

 deeper water. Off the southern shore at Coill Ach' a' Chuil, towards 

 the east end of the loch, is another bank with 6 feet of water on it, 

 in close proximity to a sounding of 30 feet. The following table gives 

 the areas between the consecutive contour-lines and the percentages 

 to the total area of the loch : 



to 25 feet 551 acres 38 '1 per cent. 



25,, 50 425 29-4 



50,, 75 301 20-8 



75,, 100 ,, 167 11-6 



Over 100 , 2 . O'l 



1446 . 100-0 



Temperature observations taken on September 24, 1902, gave 

 readings of 54 Fahr. at the surface, at 25 feet, and at 50 feet; while 

 at 80 feet the temperature was 53'5. 



Loch a' Bhealaich (see Plate LXXIII.). Loch a' Bhealaich (or 

 a-Vellich, or Vealloch) lies about 4J miles to the south of the western 

 portion of Loch Naver, with Ben Klibreck rising between them. It is 

 almost continuous with the larger Loch Coir' an Fhearna, the connect- 

 ing stream between them being only about 200 yards in length, and the 

 difference in level less than 2 feet. To the north of the two lochs 

 Ben Klibreck slopes gently up to over 3000 feet, while the ground to 

 the south is not so high, but much steeper ; so steep is that around 

 Loch a' Bhealaich (which lies in a very fine corrie) that even at noon 



