STUDIES IN POLLEN, WITH SPECIAL REFERENCE TO LONGEVITY 767 
TABLE 9. ANTIRRHINUM POLLEN StToRED aT 21°C.. 1915 
Sugar con- 
centration 
Seed Greatest | 1 which Average 
Age Flowers | capsules | germina- | ™aximum length of 
pollinated | developed tion cermin pollen tubes 
ion 
resuited 
Days Number Number Per cent Per cent 
Bie coo Bot Hig aL eee 4 3 32 10 Short-long 
Det. alo oatee CeO eee aa ae 7 HAN TD ich ML aa ee LAE | ae AL op oe UN 
IOs 2 A! syscall Seana 1 gs 1183 15 Short-medium 
I reer ce ee ere Garnier 1th 5 6 1 8 20 Short-medium 
igen ne Penman ne ae te. 3 2 9 15 Short 
Se ee Ds eek 4 IL rack 27 25 Short 
AD) ret che ie toes, 4 Op ly nh i eccrine EUS Meal Vek Sc kea Lee Sae dae 
TABLE 10. Antrrruinum PoLien Strorep at 0°C. 1915 
{ 
Sugar con- 
centration 
Fl Seed Greatest | in which Average 
Age irene d capsules | germina- | maximum length of 
Bornate developed tion germina- pollen tubes 
tion 
resulted 
Days Number Number Per cent | Per cent 
Bospadovoel Cea 7 5 9 15 Short-medium 
Dasooe lcdnec ete U 4 40 25 Medium-long 
11Q; Job eo cleo pee eee 4 4 72 20 Medium-long 
4b. 3 yal diate Geo Oe Gree 3 Dy cai ii ae rete ioisecee Iie recanetc avian | Land aetna fe 
Be 66 OOS le 5 ond eae 9 2 56 20 Short-lIcng 
4O}.3 cic BGS Se Be Ee ae 6 2 12 25 Short 
"3 So.0.0.¢.¢.o0 0:b10, 0:00 ORO CARE a nena eee Oe a Neeeeees BeeceGran! (iain A teats ota) 
were used as tests of viability. Since concentrations in which maximum 
germination took place varied on successive days and with different 
samples of pollen, six concentrations of cane sugar were used for each 
test. Slides were examined after twenty-four hours. Pollen was stored 
in small stoppered bottles, one for each withdrawal. 
