489 
Respiratory Activity of the Gynaeceum. 
having inferior ovaries, such as the Fuchsia , it was impossible to retain the 
style and stigma throughout the experiment, so that the ovaries alone 
were taken. 
The gynaeceums or ovaries were then weighed, the experiments being 
performed in pairs, pollinated and unpollinated alternately, the weights 
of material employed in each pair of experiments being as nearly equal 
as possible. 
The gynaeceums were put into a glass tube graduated into cubic 
centimetres over mercury, and an almost imperceptible quantity of water 
was passed up to the air space containing the gynaeceums, to avoid any 
deleterious effects which might be produced by the mercury vapour. 
The tubes were placed upright with their open ends immersed in 
a dish of mercury and left for a certain time, during which they were 
covered with black cloth to prevent any complications due to carbon- 
dioxide assimilation. The gynaeceums were necessarily placed in a small 
volume of air in order to obtain sufficient carbon-dioxide for analysis in 
a short time, the general time during which they were left in the tubes 
being two hours. 
The detailed results of the experiments are given below in tabulated 
form. In every case the weight of carbon-dioxide produced was calculated 
from the volume after correction to normal pressure and temperature. 
GYNAECEUMS OF EUCALYPTUS CALOPHYLLA , R. Brown 
Weight of 
material in 
milligrams. 
1 
I 
Bate. 
Condition of 
material. 
Tempera- 
ture. 
Vol. of air 
enclosed. 
Vol. per cent, of 
0 2 absorbed by 
material. 
Milligrams of C0 2 
produced by 10 
grins, of material 
per hour. 
Duration of 
experiment. 
•G ft 
^ a 
§ 
•skrio 
625 
7 / 3/07 
Pollinated flowers 
opened 4 days 
. 19 - 3 ° C. 
5c.c. 
14. L 
2-5 
2 hours 
•62 
625 
7 / 3/07 
Unpollinated flowers 
opened 4 days 
r 9 - 3 °C. 
5 c.c. 
x 7-5 
1.6 
2 hours 
•33 
6 75 
7 / 3/07 
Pollinated flowers 
opened 4 days 
T 9 ' 3 ° C. 
5 c.c. 
16.5 
2.4 
2 hours 
•52 
705 
7 / 3/07 
Unpollinated flowers 
opened 4 days 
I 9 , 3 ° C. 
5 c.c. 
13-2 
1.6 
2 hours 
•37 
775 
8 / 3/07 
Pollinated flowers 
opened 5 days 
18*2° C. 
5 c.c. 
13-4 
1.8 
2 hours 
•38 
665 
8 / 3/07 
Unpollinated flowers 
j opened 5 days 
i8. 2 °C. 
5 c.c. 
9.0 
1*0 
2 hours 
•39 
The high percentage of oxygen absorbed by the pistils of Eucalyptus 
N n 
