420 
Proceedings of the Royal Society 
Table IX. — Gain and Loss of Heat above and below the Depth corresponding 
to the intersections of each pair of Curves for the Station in Luss Basin 
(1885). 
Dates. 
Sept. 5. 
Sept. 22. 
Sept. 5. 
Oct. 15. 
Sept. 22. 
Oct. 15. 
Oct. 15. 
Nov. 14. 
Interval, days, . 
17 
40 
23 
30 
Depth of inter- ) 
section, fathoms, j 
13-5 
16 
19-5 
none. 
Mean temp, of') 
water above in- V 
tersection, j 
55°-7 
53° -45 
55° -0 
49°-2 
52° -89 
49° T 
49° -03 
46° -30 
Heat in fathom-} 
degrees in water f 
above intersec- ( 
tion, . . ) 
780 
748 
880 
787 
1031 
957 
1716 
1620 
Loss of heat in ) 
interval, . . j 
32 
93 
74 ' 
96 
Mean temp, of 1 
water below in- > 
tersection, . J 
46° -28 
47° -85 
47° TO 
48° -90 
48° -07 
48°-95 
Heat in fathom-} 
degrees in water f 
below intersec- f* 
tion, . . ) 
995 
1028 
895 
929 
745 
759 
Gain of heat in ) 
interval, . . j 
33 
22 
14 
Percentage of') 
heat passed V 
downwards, . f 
100 
24 
19 
0 
Heat passed into ) 
the air per day, j 
0 
1-78 
2*61 
3-2 
Heat passed ") 
down to water V 
per day, . . j 
1-94 
0-55 
0-61 
0 
Mean temp, of ) 
the 35 fathoms, j 
50°-7l 
59° -71 
49° *03 
1 
46° -30 
The points of intersection of the curves indicate depths where the 
temperature of the water was found to be the same on both days. 
Although the temperature of the water at this depth has risen and 
fallen in the interval, it has returned to the same thermal state at 
the end of the interval as at the beginning. In Table IX. the dis- 
tribution of heat in the water above and below these points is indi- 
