468 
Darwin . — On the Growth of 
The vegetable marrow on which the above observations 
were made was finally placed on the druggist’s balance on 
Sept. 23, when it weighed 1460 grams ; on Sept. 6 it weighed 
EXPERIMENT IX.— Sept. 17, 1892. V2. 
Time. 
Reading. 
Rate. 
Temp. C°. 
mm. 
Mgr. per min. 
8.6 a.m. 
286 
12.5 
Sun : shading taken 
8.15 „ 
287 
15-5 
off. 
8.45 ^ 
291.5 
-47 
t 9-5 
Bright sun. 
9-45 
307'5 
-89 
25 
Shading replaced. 
10.15 „ 
3 ii 
-39 
19 
Shading increased, 
10.21 „ 
3 i 4 
Sun. [door opened. 
10.59 » 
319 
—61 
18.3 
11.46 ,, 
322-5 
-25 
19-5 
Sun. 
12.0 
322.5 
12.35 p.m. 
326 
-24 
19-5 
Sun. 
» 
328 
- 16 
20 
2.0 „ 
329 
D -5 
Bright sun. 
2 3 ° „ 
330 
-9 
T 9 
3-30 „ 
331 
-6 
18 
Bright sun. 
4.0 „ 
33 1 
0 
*7 
( Sun nearly off : sha- 
4 -i 5 
332 
— 22 
18 
‘ ding removed. 
5 -o „ 
329 
+ 22 
15-5 
5 -io » 
326 
14 
Sun off. 
5-25 » 
320 
13-5 
5-35 » 
3 i 9 
+ 95 
13-5 
6.5 „ 
304-5 
+ 161 
12 
7*5 » 
283.5 
+ ii 7 
9-5 
8.10 „ 
262 
+ no 
9-5 
9-30 
244 
+ 75 
8-5 
704 grams, so that in 16 days it gained 756 grams, or about 
33 mg. per minute. 
Increase and Decrease in the size of Cucurbita Fruits . — The 
observations were made with the apparatus designed by 
Mr. H. Darwin and used by Miss Anna Bateson in her 
paper on the change of shape in turgescent pith 1 . A ver- 
tical micrometer screw graduated to o-oi mm. carries at its 
lower end a vertical needle. The micrometer is supported 
on a strong retort-stand, and is so arranged that the 
needle-point is over the centre of the gourd, which rests on 
a firm support. A minute ebonite vessel, 3 or 6 mm. in 
1 Annals of Botany, Vol. IV. 
