]76 
BATHYMETKICAL SURVEY OF 
of the cross lines of soundings towards both ends of the loch indicate slight 
undulations of the lake-floor. 
The following table, showing the approximate areas between the 
contour-lines, and the percentages to the total area of the loch, indicates a 
larger area, and consequently on the average a gentler slope, between 25 
and 50 feet than between the shore and the 25-feet contour : — 
Feet. 
Acres. 
Per cent. 
Oto 25 
211 
27-2 
25 „ 50 
263 
33-9 
50 „ 75 
156 
20-1 
75 „ 100 
93 
12-0 
Over 100 
52 
6-8 
775 
lOO'O 
Temperature observations in the deepest part of the loch on August 16, 
1904, showed a nearly uniform temperature from surface to bottom, 
probably brought about by a heavy gale which had been blowing during 
the three previous days accompanied by much rain ; the readings indicated 
a range of only half a degree Fahr. : — 
Surface ... 
20 feet . . . 
50 „ ... 
122 „ ... 
eo'^-o Fahr 
59°-7 „ 
59^-7 „ 
59°-5 „ 
