Marsh , and its Relations to Evaporation , 299 
This depth was chosen because the roots of the majority of species rarely 
penetrate, in this wet soil, to a much greater depth than this. 
TABLE III. 
Temperatures, 1907 (Series 1 to 4). 
Position . 
Mean daily 
tempera- 
tures. 
Mean of 
daily 
maxima. 
Mean of 
daily 
minima. 
Mean 
diurnal 
range. 
Absolute 
extremes. 
A. 
16.5° c. 
22*1 
6.6 
i 5*5 
25*5 
2*0 
B. 
— 
23-0 
— 
— 
26.8 
— 
C. 
14.1 
18-0 
7 -i 
10.9 
21.2 
2-5 
D (soil). 
11.8 
1 2-4 
1 1.2 
1.2 
14.7 
9.2 
TABLE IV. 
Temperatures, 1907 (Series 2 and 3 only). 
Position. 
Mean daily 
tempera- 
tures. 
Mean of 
daily 
maxima. 
Mean of 
daily 
minima. 
Mean 
diurnal 
range. 
Absolute 
extremes. 
A. 
17.0 0 C. 
23*4 
7-5 
15*9 
25*5 
2.8 
B. 
17.2 
24.4 
7.2 
17.2 
26.3 
2-5 
C. 
14.7 
18.8 
8-5 
10.3 
20.2 
3-6 
D (soil). 
12.7 
13-3 
I 2*2 
11 
T 4*7 
10.5 
TABLE V. 
Temperatures, 1908. 
Position. 
Mean daily 
tempera- 
tures. 
Mean of 
daily 
maxima. 
Mean of 
daily 
minima . 
Mean 
diurnal 
range . 
Absolute 
extremes. 
A. 
16*2° C. 
23*5 
8*5 
15.0 
28.5 
3 ‘i 
B. 
16.3 
25.6 
6.0 
19-6 
3 i -7 
1*2 
0 . 
14.9 
22-2 
6.9 
1 5-3 
29.5 
1.8 
D (soil). 
14.8 
I 5*3 
14-3 
1*0 
156 
12-8 
Perhaps the most striking of the results shown in the above tables 
is the relatively wide range of temperature recorded for position B, Almost 
