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Table IV. Senecio silvaticus, sun leaves. 



Nr. 



Date 



Area of leaf in square 

 centimeters (upper + 

 lower surface) 



Rate of air current 

 in minutes for 1 1 



p. 



M 



S 

 .2 



.2 



d 

 u 



Mean C0 2 content of 

 air in the receiver 



Tempe- 

 rature 



CO, absorbed per 

 hour per 50 cm 2 of the 

 upper surf. + 50 cm' 2 



of the lower surf. 



C0 2 absorbed corr. 

 for temperature and 

 C0 2 content 



Intensity of light 

 (Bunsen's units) 



Size of stomatal 

 openings 



1 



20 / 7 15 



8.0 









13° 



3.3 



5.4 



6.8 





2 



» 



12.0 



25 



0.66 



0.59 



13° 



2.8 



4.3 



7.5 



2 



3 



22 / 7 15 



14.0 



28 



0.72 



0.66 



16° 



1.8 



2.0 



2.1 



2 



4 



2 */ 7 15 



16.0 



29 



0.63 



0.46 



18° 



4.4 



6.0 



12.0 



2 



5 



» 



16.0 



30 



0.63 



0.59 



18° 



1.0 



1.1 



2.3 



2 



6 





16.0 



31 



0.63 



0.62 



18° 



0.2 



0.2 



0.6 



2 



7 



» 



16.0 



31 



0.63 



0.65 



18° 



^0.5 



4-0.6 



0 



2 



8 



28 / 7 15 



50.0 



31 



0.54 



0.66 



17° 



4-0.9 



-v- l.i 



0 





9 



» 



50.0 



31 



0.54 



0.62 



17° 



4-0.6 



4-0.7 



0.2 





10 



» 



50.0 



31 



0.54 



0.59 



17° 



4-0.4 



4-0.5 



0.6 





11 



» 



50.0 



30 



0.54 



0.45 



17° 



0.7 



1.0 



2.4 





12 



10 / 9 16 



40.0 



32 



0.67 



0.68 



17° 



-r 0.1 



4-0.1 



0.8 





13 



» 



40.0 



31 



0.67 



0.74 



17° 



4-0.7 



4-0.9 



0 





