766 
H. E. KNow.ton 
Storage experiments with Antirrhinum pollen 
Influence of temperature 
The investigation of pollen storage, in 1915, consisted only of a study 
of the effect of different temperatures on pollen longevity. Both the 
germinative power on artificial media and the ability to actually fertilize 
TABLE 7. ANTIRRHINUM PoLLEN StorEeD aT 40°C. 1915 
Sugar con- | 
centration 
ae Seed Greatest | in which Average 
Age linated capsules | germina- | maximum length of 
poe developed tion germina- pollen tubes 
tion 
resulted 
Days Number Number Per cent Per cent 
LOU Sy Ssceh es crest neers cet nr | Ravan ot een et Ie Meets Aa 60 15. > eras cone 
ie EPA eras eee Ng ar a 1 1 80 774 | UR Vises icin Sicha 
Sis Se eae Pas On ce te 2 0 42 30 Short 
ICD ERE ee i eae as Gee aera rah 5 1 54 25 Short 
11g Ee ee eet mer enn 4th oR 5 0 AT 30 Short 
DOI ea eae ei AVR Ree eter | 3 0 65 20 . Short—medium 
ets ears Ameer Ao een ores 7 1 60 25 Short—medium 
7: VIEL Ak Vaan nee neaeRe 3 0 30 20 | Shore 
i 
TABLE 8. ANTIRRHINUM POLLEN StTorED aT 30°C. 1915 
| | Sugar con- 
centration 
Thies Seed Greatest | in which Average 
Age were. | capsul ina- length of 
g ollinated | C@Psules | germina- | maximum eng 
P | developed tion germina- pollen tubes _ 
tion 
resulted 
Days Number Number Per cent Per cent 
Sys Bis Cees teed Mae ee 3 5 Ee |! 2 on oso uma sac 
A ea rtars Sak de ages ce re 6 2 35 25 Short—medium 
LOS ae ees rots es ae nut Soo 3 0 2 25 Short 
Ae ee AAP Pre Uren Mh) 6 a 0 .. | 22k. 58 deere 
CL oy SO eA OR | US 5 0 QO | oa ot SE eerste sce 
DS Re 5 Se eR eae ee 3 0 O° | Sao eres 
