498 
White. — The Influence of Pollination on the 
GYNAECEUMS OF AGAPANTHUS UMBELLATUS 
VAR. ALBIFLORUS , L’Herit. 
Weight of 
material in 
milligrams. 
b 
a 
jS" 
Condition of 
material. 
Tempera- 
ture. 
Vol. of air 
enclosed. 
Vol. per cent, of 
0 2 absorbed by 
material. 
Milligrams of CO 2 
produced by 1 0 
grms. of material 
per hour. 
Duration of 
experiment. 
1 t 
^ 1 
Qc; ^ 1 
2CO ; 16/3/07 
Pollinated flowers 
opened 6 days 
19*6° C. 
5 c.c. 
09 ; 
2-5 
2 hours 
•57 
I 9 ° , 16/3/07 
Unpollinated flowers 
opened 6 days 
19-6° C. 
5 c.c. 
1-7 
2-3 
2 hours 
•59 
235 j 16/3/07 
Pollinated flowers 
opened 6 days 
19-6° C. 
5 c.c. 
3-3 
2-3 
2 hours 
.36 
220 ! 16/3/07 
Unpollinated flowers 
opened 6 days 
19-6° c. 
5 c.c. 
-7 
i-6 
2 hours 
.29 
240 22/3/07 
Pollinated flowers 
opened 7 days 
1 8° C. 
5 c.c. 
3-i 1 
i*5 
| 2 hours 
• J 7 
24O 22/3/07 
Unpollinatedfl 0 wers 
opened 7 days 
i8°C. 
5cc. 
3*3 
.19 
1 2 hours 
•63 
Except in one pair of experiments in Agapanthus , in which the weight 
of carbon-dioxide evolved per gram of material was the same for the 
unpollinated as for the pollinated specimens, every result which has been 
obtained shows a distinctly marked rise in the evolution of carbon-dioxide 
in the pollinated gynaeceums, as compared with the unpollinated. 
The most strongly marked results were manifested in Pelargonium 
zonale , the amount of carbon-dioxide produced by the pollinated material 
being 5-8 times greater than the amount produced by the unpollinated. 
Pronounced differences were also observed, though to a less degree in 
Cheiranthus Cheiri , the pollinated specimens producing 2*0 times as much 
as the unpollinated, and in Antirrhinum majus the pollinated material 
evolved 2-6 times as much by weight of carbon-dioxide as the unpollinated. 
Throughout the series of experiments, with a few rare exceptions, the 
respiratory quotient in the pollinated gynaeceums exceeded that in the 
unpollinated, the principal exceptions occurring as isolated cases among 
the Monocotyledons. These irregular fluctuations, however, appeared to 
be independent of pollination, and, when they did occur, in no case did the 
respiratory quotient in the unpollinated specimens exceed that in the 
pollinated specimens to any great extent ; the most notable instance being 
found in the Canna , where the respiratory quotient in the unpollinated 
specimens in one pair of experiments was in excess of that in the pollinated 
