318 



BATHYMETRICAL SURVRY OP 



of the bottom between the two deep basins. The cross-section G-H 

 is taken at the position of the deepest sounding, and shows a slight 

 rise of the bottom off the western shore from 80 to 75 feet. This 

 section shows a steep offshore slope at both sides of the loch, but more 

 especially off the eastern shore, where a sounding in 78 feet was taken 

 about 80 feet from shore, and this steep slope off the eastern shore 

 is continued to the northward, where a sounding in 48 feet was taken 

 about 60 feet from shore. The soundings taken on the rise between the 

 two deep basins indicate a rather uneven floor; for instance, one line 

 of soundings from west to east shows that the bottom sinks gradually 

 from the western shore to 86 feet, then rises to 60 feet, sinks to 

 75 feet, rises to 30 feet, sinks slightly again to 32 feet, and then rises 

 towards the eastern shore ; a little farther south a sounding was taken 

 in 40 feet between two deeper soundings (54 and 57 feet). 



The following table gives the approximate areas between the 

 consecutive contour-lines, and the percentages to the total area of 

 the loch : 



Oto 50 feet 

 50,, 100 

 100,, 150 ,, 

 150,, 200 ,, 

 Over 200 , 



612 acres 

 522 

 246 

 200 

 49 



1629 , 



38 per cent. 

 32 

 15 

 12 

 3 



100 



Temperature Observations. Many observations of the temperature 

 of the surface water in Loch Laoghal were taken on September 26, 27, 

 and 29, 1902, and two serial temperatures were taken on September 29, 

 one in each of the two deep basins. The surface temperature varied 

 from 52-5 to 53'6 Fahr. The serials gave the following results : 



