408 
Proceedings of the Royal Society 
The distribution in series Nos. 2, 3, and 4 is graphically repre- 
sented in fig. 2, and it will be seen that the curves have a marked 
summer character. The steepest gradients are between 10 and 15 
fathoms. At Culness (No. 3) the fall of temperature is 6° *9 in this 
interval, or 1 0, 38 per fathom. The least steep gradient is on the 
northmost station, No. 4, indicating greater mixture of the layers 
Table II . — Observations in Loch Lomond , 5 th September 1885. 
Name of Basin, 
Luss. 
Tarbet. 
Ardlui. 
Locality, j 
Ross 
Rowar- 
Stuck- 
Cul- 
Inver- 
Donne 
Mill. 
dennan. 
gowan . 
ness. 
snaid. 
Farm. 
Miles from Bal- ) 
loch Pier, . ) 
74 
9 
11 
12f 
14 
17 
Depth at Station, 
33 
37 
87 
100 
100 
34 
Hour of day, 
11 A.M. 
Noon. 
1 P.M. 
2 P.M. 
8 P. M. 
4.20 p.m. 
No. of Station, . 1 
5 
6 
7 
8 
9 
10 
Depth. 
Fathoms. 
No. of 
Thermo- 
meter. 
Temperature (Fahr. )'. 
o 
o 
o 
o 
o 
* 0 
0 
' 56*2 
56-5 
56-4 
56-0 
56-5 
5 
9 
55-9 
55-1 
55-3 
55-8 
56-3 
10 
80 
55 75 
54-8 
54-8 
55-75 
55*75 
15 
79 
49-1 
51-25 
49-0 
49-8 
48-1 
20 
47 
48-3 
45-6 
45-8 
45-6 
46-5 
30 
21 
47-0 
43*2 
43-5 
43-2 
45-25 
35 
47 
42-4 
42-7 
40 
79 
42-5 
45 
79 
42-15 
42 2 
50 
9 
42-05 
65 
9 
41*85 
41-8 
70 
80 
42*0 
80 
47 
41-75 
85 
80 
41 ‘-8 
41 : 7 
S S 87 
21 
41-8 
£ j 100 
21 
41 -8 
41-8 
0 to 30 mean, 
53-93 
51-23 
50-87 
51-32 
51-57 
Steepest \ 
gradient, f 
Degs. pei 
fathom, 
Depth, 
’ | 1-33 
13 
1-13 
16 
1-16 
13 
1-19 
15 
1-53 
13 
of water towards the head of the loch. The curves show also, in a 
remarkable manner, the difference in temperature of the water at 
the same depth in different localities. The greatest difference is 
found at 10 fathoms, at which depth the temperature at Rowar- 
dennan exceeds that at Rob Roy’s Cave by 2 0, 55. Although the 
