497 
Respiratory Activity of the Gynaeceum . 
In experimenting with Monocotyledons, irregularities in both C0 2 
production and 0 2 absorption were found to be of more frequent occurrence 
than in Dicotyledons. 
Also the respiratory activity of the gynaeceum was in each case much 
feebler than in the Dicotyledons. 
From the data given for the experiments on Lilium candidum it will 
be seen that it was necessary to leave the material enclosed in the tube 
for many hours before any appreciable change in the enclosed air was 
observed. 
GYNAECEUMS OF CANNA INDICA, L. 
Weight of 
material in 
milligrams. 
Date. 
Condition of 
material. 
Tempera- 
ture . 
Vol. of air 
enclosed. 
Vol. per cent, of 
0 2 absorbed by 
material. 
Milligrams of CO 2 
produced by 10 
grms . of material 
per hour. 
Duration of 
experiment. 
Resp. quotient 
C 0 2 
— — - volume. 
o 2 
290 
13/3/07 
\ Pollinated flowers 
opened 7 days 
19-6° C. 
5 c.c. 
, 9 | 
2-0 
1-7 hours 
■57 
205 
1 3/3/07 
Unpollinated flowers 
opened 7 days 
19-6° C. 
5 c -c. 
3-2 
•5 
1-7 hours 
.62 
270 
20/3/07 : 
Pollinated flowers 
opened 5 days 
16.5° C. 
5 c.c. 
2.7 
1.6 
1 2 hours 
•36 
320 
20 /3/07 
Unpollinated flowers 
opened 5 days 
16-5° c. 
5 c.c. 
3-o 
• 1 
2 hours 
•03 
240 
20/3/07 
Pollinated flowers 
opened 5 days 
i6-5° C. 
5 c.c. 
3.2 
3*9 
2-2 hours 
.72 
300 
20/3/07 
1 
Unpollinated flowers 
opened 5 days 
16-5° C. 
5 c.c. 
2.4 
•6 
2.2 hours 
• 20 
The principal fact noted here was that the carbon-dioxide given 
off was markedly less than in the experiments previously given on other 
flowers. 
The ratio of the carbon-dioxide evolved by the pollinated to that 
7 5 
evolved by the unpollinated specimens was — 
The respiratory quotient of the former was to that of the latter as o*55 
is to o-s8. 
