464 
Darwin. — On the Growth of 
temperature curves in Fig. 1 must depend on the fact that in 
a greenhouse the air is, roughly speaking, drier when the 
temperature rises and damper when it falls. Fig. 1 also shows 
the afternoon rise and the nocturnal fall in growth. 
EXPERIMENT IV.— Sept. 12, 1892. V2. 
Time. 
Reading. 
Rate. 
Temp. C°. 
mm. 
Mgr. per min. 
6.0 a.m. 
117 
14-5 
•30 > ) 
m -5 
— 60 
14-8 
113 
+ 17 
15-5 
30 „ 
ii 4-5 
+ 17 
16.5 
8.0 „ 
115 
+ 6 
19 
•30 » 
H 2-5 
— 28 
20 
9 -o » 
109 
-39 
2 i -5 
•30 „ 
m -5 
+ 28 
20.5 
• 5 ° » 
114 
+ 41 
20 
No sun. 
10.20 „ 
”7 
+ 33 
•50 „ 
122 
+ 56 
19-5 
Half sun. Blind down. 
11.20 ,, 
123-5 
+ i 7 
23-5 
Cloudy. 
.50 „ 
128 
+ 50 
22.5 
Ditto, blind up. 
12.32 p.m. 
130 
+ 16 
23-5 
1.42 „ 
•133 
+ 14 
24-2 
Sun. 
2.13 „ 
133-5 
+ 53 
24-3 
Sun. 
•55 „ 
135 
+ 12 
22 
Sun. 
3*35 „ 
138 
+ 25 
22.5 
4 -i 3 „ 
142 
+ 35 
Altered weights. 
4-25 „ 
118 
21.5 
5-25 „ 
124 
+ 33 
. 21 
6.25 „ 
133-5 
+ 53 
*9 
7-25 „ 
147 
+ 75 
17-5 
8.25 „ 
162 
+ 83 
i 7 
9- 2 5 „ 
174-5 
+ 70 
16-5 
Altered 
weights. 
9-37 » 
85-5 
10.0 „ 
87 
+ 22 
IO -37 
9 i -5 
+ 41 
i<5-5 
Fig. 2 represents Exp. 4. The same general character is 
shown ; namely loss of weight or diminution of rate, as the case 
may be, occurring with rises of temperature. The evening rise 
is as usual followed by a decrease in rate of growth. 
Exp. 5 (represented in Fig. 3) is worth giving on account 
of the long continued loss of weight ; the fruit does not begin 
