462 Darwin. — On the Growth of 
added on a series of days ; also the number of millimeters 
through which the index moved, and the calculated value 
in millimeters of one gram. 
In calculating my results I have taken 1 gram as equal to 
3 mm. on the scale. 
The instrument when used for other purposes, for instance 
for transpiration, is fairly accurate, but when, as in the present 
instance, it is hampered by the springlike, and probably 
varying, effect of the branch on which the fruit is borne, it 
is but a rough apparatus. I believe, however, looking at my 
results as a whole, that the errors are not sufficient to cast 
serious doubt on the general conclusions deducible. 
We have seen in Exp. 1 that the fruit which I describe in 
my notes as V2 was continuously increasing in weight from 
Sept. 6 to Sept. 9. The following table shows the remarkable 
fact that a loss of weight may occur. Later observations 
show that this is common, and that it is accompanied by 
a diminution in volume 1 . The change in weight is given in 
milligrams per minute ; when the figures in the third column 
EXPERIMENT II.— Sept. 10, 1892. V2. 
Time. 
Reading. 
Rate. 
1 1.6 a.m. 
mm. 
89 
Mg. per minute. 
12.2 ,, 
9 1 
+ 12 
12.55 „ 
98 
+ 44 
2.1 „ 
117 
+ 95 
2-33 „ 
no 
-73 
3-15 „ 
114 
+ 31 
4* I 5 „ 
119 
+ 3° 
5- 2 ° „ 
128 
+ 46 
6 „ 
136 
+ 66 
7 » 
148 
+ 66 
8 „ 
163 
+ 83 
9 
173 
+ 55 
10 „ 
181 
+ 44 
1 1 p.m. 
188 
+ 33 
are preceded by + there is a gain in weight, while a minus 
sign means loss in weight. 
1 Kraus, loc. cit., has described the shrinking of various fruits. 
