248 
BATHYMETRICAL SURVEY OF 
0 to 25 feet 
25 „ 50 „ 
Over 50 ,, 
78 acres 55 "4 per cent. 
49 „ 34-3 
15 ,, 10-3 
142 „ 100 0 
T ernperature Observations .- — The following serial temperatures were 
taken at 3 p.m. on July 8, 1902, in the deepest part of Loch Dilate : — 
Surface 
10 feet 
20 „ 
25 „ 
30 „ 
50 ,, 
62°*3 Fahr. 
62° -3 „ 
62° -3 ,, 
61°-5 ,, 
55° -3 „ 
53 '3 ,, 
This series shows a constant temperature from the surface down 
to a depth of 20 feet, a slight fall of 0°-8 between 20 and 25 feet, then 
a very rapid fall of 6°-2 between 25 and 30 feet (a fall exceeding 1° per 
foot of depth), and a further fall of 2° between 30 and 50 feet, the 
extreme range of temperature being 9° Fahr. 
