after Lmmersiox in Liquid Air 



677 







Table II 



Germination* Percentages of treated and untreated Seeds in Soil 





Untreated 



Ii 



mmersed 



in Liquid Ai 



r by 





Immersed 



1 in ] 



Liquid Air by 









sudden Transition 



gradual Transition 





Orig. Seeds ■ 



6 hours 



12 hours 



24 hours 



48 b 



iours 



: 



Name of Seed 



































</5 



c/i c/i a 



c/i 



en tn tfJ 



C/3 ifk 



(A 



■A 



n 



t/3 f/i 



t/3 





>. 



>» 



■ * 



>% 



>>>>>* 



>% 



>. >, >> 



>» >> 



>s 



>> 



>% 



^■^ ' 



>» 



>% 









d CI 



~0 TJ 



-a -a 





ri ri ri ri 



-O ! td -O -a 



d ri cd 



T3 "O *U 



4 









-a 



B- 



♦ 



OS 



M 



o 





*> 



M 



A 



-*- 



M 







CO 



4 



^ 



VO 







7 



7 





VO 







M 







^nobrychis saliva 







O 



Mimosa pudica 









20 



















24 







• 



16 



4 







16 



Pin us sylvestris 









7 

































O 



Helianthus annuus 





66 8o 8o 



40 60 60 





42 42 



50 



60 60 60 20 40 40 



40 



Aicumis satwus 









o 





! i 







l 







7 7 



7 



7 





O 



vcale cereale 



20 



53 53 53 



32 



76 76 76 16 



56 6O1 60 



72 80 80 80 80 84 84 84 



'rituum sativum 



20 



86 86 86 



36 



68 88 88 16! 92 92 92 



8 12 12 8 24 36 36 



: 72 76 , 76 1 76 60 ; 76 80 So 



L i n u m usita tissim u m 





4747 47 





12 44 44 144 36 



44 48 '48 



lea A/ays 







o 



Not tested. 



























• 



O 



; Ri cin us com m un is 



T * « 









47 



< < it 









5o 

















33 



33 



WMpinus lute us 









o 



it << 

































1 C/i en opodiu m a I bum 









36 



4 



El 



a 









8 



40 







13 



27 







16 



32 





Somewhat of irregularity in the length of the day periods is 

 due to the fact that these lots were handled at different times and 

 equal intervals were not followed. 



It is not apparent to the writer that any marked unfavorable 

 effect on germinable seeds may be traced to the immersion, that is, 

 to the extremely low temperature to which they were subjected. 

 Gradations appear with respect to the results of a longer or shorter 

 operation of the cold, perhaps, more conspicuously on seeds of 

 lower vitality. With sunflower, wheat, rye, even the prolonged 

 period of 48 hours has increased if it has in any manner changed 

 the promptness of germination, comparing the more regular germi- 

 nation upon moistened filter paper.* 



The temperature of liquid air is stated at — 190 C. Certainly 

 the seeds immersed in liquid air for 48 or even 24 hours would 

 scarcely fail to come to the temperature of the surrounding me- 

 dium. Physiologists will doubtless agree that only dry seeds may 

 withstand this low temperature. For the agriculturist the ex- 

 periments of this class enforce a homely injunction to prepare in 

 advance of the winter. 



*MacDougal, Practical Text-book of Plant Physiology, 89-91. 1901 



