Marsh , and its Relations to Evaporation , &c. 
295 
TABLE II. 
Date 
1908 
Recorded at Wicken Fen. 
Recorded at Cambridge. 
Tota 
in c.c 
A 
l evapor 
1 for 
periods. 
B 
ation 
-hour 
G 
Maximum 
mum temp 
degrees C 
A 
and n 
eratur 
entign 
B ! 
tim- 
es m 
ade. 
C 
Wind 
direction, 
and 
velocity 
( estimated 
acc. to the 
Beaufort 
scale). 
Relative 
humidity. 
Rainfall 1 
in inches. 
Number 
of hours 
sunshine. 
July 31 
67.6 
4°* I 5 
12.85 
max. 24.5 
min. 12-4 
26-7 
9.0 
24.0 
9-5 
W. 
1 to 3 
9 a.m., 64 
9 p.m., 71 
0 
10-41 
August 1 
64.05 
34*7 
10.3 
22*8 
5-5 
26.0 
2-3 
20.3 
3 -o 
N.W. 
0 to 3 
64 
76 
0 
11.58 
n 2 
70*3 
43-35 
12-8 
23-4 
4.1 
25-3 
1.6 
21.8 
2-4 
N. 
0 to 3. 
58 
84 
0 
12.50 
J5 3 
64.7 
34-85 
7*45 
28-5 
3-i 
3 1 ' 2 
1.2 
2 9-5 
1.8 
W.toN.W. 
0 to 2 
67 
76 
0 
12.08 
» 4 
60.35 
30-05 
8-3 
26-9 
8.2 
30.0 
5-6 
27.7 
5-5 
W.toN.W 
1 to 2 
65 
78 
0 
i 7.00 
» 5 
22.9 
9.4 
2.95 
15-7 
11.8 
15.7 
10-4 
14.8 
10.6 
W. to N. 
3 to 4 
76 
92 
0-01 
0-16 
„ 6 
46.7 
27.8 
5-95 
21-4 
12-4 
22.0 
1 2-2 
19-8 
12.5 
N. 
3 to 4 
75 
85 
0.15 
1.91 
„ 7 
62-0 
39-05 
9-5 
23-7 
12.3 
25-5 
7-7 
23.8 
IO-I 
N.W. 
0 to 4 
8i 
93 
0 
9-00 
„ 8 
1 5*7 5 
8.0 
2-6 
20.6 
7-7 
21.8 
5-4 
18.3 
7-5 
Calm. 
0 
1 9 1 
99 
0 
| 0.50 
» 9 
58-5 
3i-9 
5-8 
27-5 
7.6 
3i-7 
5-2 
22.5 
6-5 
N.W. 
0 to 1 
63 
81 
0 
8.91 
The results of the 1908 observations show that shoots at, or just below, 
the general vegetation level are exposed to transpiration conditions little 
more than half as severe as those which exist at a level well above the vege- 
tation. Also, although the herbage is only about two feet in height, its 
lower strata have an atmosphere which on the average is about four times 
as humid as that of the upper strata, and seven times that two feet above 
the vegetation. 
It will be noted that evaporimeters B and C recorded, on the whole, not 
only relatively, but actually, much greater water-loss in 1908 than in 1907. 
This is to be accounted for partly by the differences in the character of the 
1 These are the corrected readings; see Appendix, p. 313. 
2 Note that the 24-hour periods in this table are reckoned from 8 p.m. to 8 p.m. On the other 
hand, the Cambridge rainfall readings are taken at 9 a.m. each day. From notes made at Wicken 
I think part of the rainfall on August 6th should be credited to the 5th. 
