494 
Delf. — Transpiration and Behaviour of 
and 6 p.m. there was also fitful sunshine, but the observations were then 
made at longer intervals of time. At the end of the experiment the Sedum 
and Salicornia appeared fresh, but very slightly perceptibly flaccid, whilst 
the Vicia was very much withered and indeed almost brittle. These figures 
are shown graphically in Fig. 9. 
TABLE VII 
Loss in Weight of Salicornia , Vicia, and Sedum forgiven Time Intervals , 
per too sq. cm. 
Time. 
Temp. 
Humidity. 
Sedum spurium. 
Sal. annua. 
Vicia cracca. 
Water. 
9.40 a.m. 
io j, 
19.8° C. 
20 ,, 
57 % 
55 >> 
0-084 grin. j 
0.075 grm. 
1 0-057 g rm - 
0.234 grm. 
10.20 „ 
so „ 
55 „ 
0.063 33 
0-058 „ 
0*028 ,, 
0-206 ,, 
10.40 ,, 
20.1 „ 
56,, 
0.049 ,, 
0.067 33 
0.017 „ 
0.184 „ 
11 » 
20-2 „ 
55 35 
0*046 „ 
0.067 ,, 
0.017 „ 
0-259 „ 
11.20 „ 
20 . 3 ,, 
55 >3 
, 0.046 „ 
0.058 „ 
0-013 „ 
0-253 „ 
11.40 » 
20.8,, 
57 33 
0.049 ,, 
0.042 ,, 
0-009 ,, 
0-235 33 
12.40 p.m. 
20.3,, 
62 „ 
0-115 „ 
0.091 „ 
0018 ,, 
0.684 „ 
6.5 ,, 
21 „ 
5*33 
0.699 „ 
1 1.099 33 
0-109 ,, 
0.746 „ 
6.30 „ 
21 „ 
65 3 3 
0.038 „ 
I 0.042 „ 
0-005 33 
0-655 33 
Surface Areas 
14.32 sq. cm. 
5.96 sq. cm. 
50.54 sq. cm. 
25.49 sq. cm. 
Fresh Weight 
0-932 grm. 
0-432 grm. 
0-487 grm. 
I 
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Fig. 9. Curves showing loss of water by weight per 100 sq. cm. in Salicornia , Vicia , and 
Sedum for first two hours of withering. Abscissae represent time intervals of 20 minutes ; ordinates 
represent loss in weight in grammes. Figures taken from Table VII. 
It will be seen that there is a striking resemblance between the be- 
haviour of the two succulent types, and that the transpiration of both of 
these considerably exceeds that of the mesophytic type. It should, how- 
ever, be observed that in the case of both Sedum and Vicia, the leaves used 
