246 



BATHYMETRICAL SURVEY OF 



The areas between the consecutive contour-lines drawn at equal 



intervals, and the percentages to the total area of the loch, are as 

 follows : 



2632 acres 54 '4 per cent. 



9G8 ,, 20-0 



711 ,, 14-7 



484 lO'O 



45 <H 



to 100 feet 

 UK),, 200 

 200,, 300 ,, 

 300,, 400 ,, 

 Over 400 



4840 



KKVO 



This table shows that more than half of the entire floor of Loch Shiel 

 is covered by less than 100 feet of water, and about three-fourths by 

 less than 200 feet, while only 1 per cent, is covered by water exceeding 

 400 feet in depth. The slope of the bottom is on the whole gentle, but 

 in certain places deep water was found comparatively close inshore, 

 and the consequent crowding of the contour-lines indicates a steeper 

 slope than usual in these positions. 



Temperature Observations. Numerous observations were made on 

 the temperature of the surface water of Loch Shiel during the week 

 spent on the survey, the range observed being 8'2, from 54 0> 2 to 62 0> 4. 

 Three serial temperatures were taken beneath the surface, with the 

 following results : 



TABLE OF SERIAL TEMPERATURES TAKEN IN LOCH SHIEL. 



In this table the observations are arranged chronologically, but the 

 series given in the first column was taken about midway between the 

 other two series, the second column giving a series taken towards 

 the foot, and the third column a series taken towards the head, of the 

 loch. The central series in the first column was taken three days 

 earlier than the others, and is therefore not strictly comparable ; it 

 shows a higher temperature in the surface waters, and a lower tempera- 



