412 Mr. F. Kidd. TJie Controlling Influence of 



Table I. — The Effect of Increased Partial Pressures of COo on Barley 

 {Hordeum vulgare) in Retarding and Inhibiting Germination, and the 

 Eesumption of Normal Activity on Removal of these Increased Partial 

 Pressures. 



Actual percentage 

 of CO; in air as set. 

 (By analysis.) 







Germinations. 









In presence of raised 

 C0 2 pressures. After 



In air after removal of raised 

 CO; pressures. After 



"Pinal 



TtPTPPTlt'.n IT A 

 ' L tiOl ILALLiG/ 



42 hrs. 



70 hrs. 



118 hrs. 



20 hrs. 



44 hrs. 



70 hrs. 



Final 

 12 days. 







7 



9 



10 











100 



(air with KOH) 



















6-0 



7 



8 



9 











90 



12 -0 



9 



9 



9 











90 



17 -3 



5 



8 



8 











80 



23 -5 



3 



6 



6 



8 



9 



9 



9 



90 



29 -5 



3 



3 



5 



8 



9 



9 



9 



90 



35 -0 . 







1 



8 



10 



10 



10 



100 



37 5 









5 



7 



8 



8 



80 



43 -5 









1 



2 



3 



6 



60 



96 -0 





















Temperature, 20' C. thermostat. 10 seeds in each experiment. 



Table II. — The Effect of Increased Partial Pressures of C0 2 on Peas (Pisum 



sativum) in Retarding and Inhibiting Germinations and the Resumption 

 of Normal Activity on the Removal of these Partial Pressures. 



Approximate 

 percentage of 

 C0 2 in air as set. 

 (By analysis.) 



Germinations. 



Final total 

 germinations out 

 of five seeds in 

 each case. 



In presence of raised 

 pressures of CO». 

 After 



In air after removal of 

 raised pressures of C0 2 . 

 After 



44 

 hrs. 



68 

 hrs. 



96 

 hrs. 



7th 

 day. 



8th 

 day. 



9th 

 day. 



11th 

 day. 



20th 

 day. 



(air) 



1 



1 



5 



5 











5 



6 







2 



3 



4 











4 



12 



1 



3 



4 



5 











.5 



18 





1 



5 



5 











5 



24 









1 



5 











5 



30 





2 



4 



4 



5 



5 



5 



5 



5 



50 











3 



4 



5 



5 



5 



70 











2 



4 



4 



4 



4 



100 















1 



2 



3 



3 



Temperature, 20° C. thermostat. Five seeds in each case. 



