Table I. Sinapis alba. 



Nr. 



Date 



Area of leaf in square 

 centimeters (upper + 

 lower surface) 



Rate of air current 

 in minutes for 1 1 



C0 2 in air in mg per 1 



Mean C0 2 content of 

 air in the receiver 



Tempe- 

 rature 



C0 2 absorbed per 

 hour per 50 cm 2 of the 

 upper surf. + 50 cm 2 



of the lower surf. 



C0 2 absorbed corr. 

 for tempeiature and 

 C0 2 content 



Intensity of light 

 (Bunsen's units) 



Size of stomatal 

 openings 



1 



i/a 16 



14.4 



25 



0.58 1 ) 



0.61 



? 



-5-1.0 



-5-1.0 



1.5 





2 



» 



14.4 



26 



0.58 



0.45 



? 



4.2 



5.1 



9.0 





3 



3 /s 16 



14.0 



26 



0.57 



0.53 



18° 



1.3 



1.5 



3.8 





4 



» 



14.0 



29 



0.57 



0.53 



18° 



1.2 



1.5 



3.8 





5 



5 / 8 16 



10.0 



26 



0.56 



0.52 



? 



1.9 



2.0 



9.0 



2 



6 



» 



16.0 



27 



0.56 



0.55 



? 



0.3 



0.3 



1.5 





7 



7 / 8 16 



40.0 



27 



0.59 



0.59 



18° 



0.0 



0.0 



2.1 



2 



8 



» 



40.0 



27 



0.59 



0.60 



18° 



-f-O.l 



-5-0.1 



1.2 



2 



9 



» 



40.0 



29 



0.59 



0.65 



18° 



-.-0.6 



-5-0.7 



0 



2 



10 



10 / 8 16 



16.2 



*28 



0.63 



0.54 



21° 



2.4 



2.3 



6 



2 



11 



» 



16.2 



27 



0.63 



0.56 



20° 



1.9 



1.9 



3.8 



2 



12 



» 



6.0 



27 



0.63 



0.55 



20° 



5.9 



5.9 



17.0 



2 



13 



19 / 8 16 



16.6 



30 



0.72 



0.59 



20° 



3.1 



2.9 



7.5 



2 



14 



» 



16.6 



30 



0.72 



0.67 



20° 



1.2 



1.0 



2.7 



2 



15 



» 



16.6 



30 



0.72 



0.64 



20° 



1.9 



1.6 



4.5 



2 



16 



» 



9.5 



28 



0.72 



0.62 



20° 



4.5 



4.0 



13.5 



2 



17 



22 / 8 16 



8.4 



27 



0.61 



0.48 



26° 



6.9 



5.5 



37 





18 



4 / 9 16 



40.6 









16° 



-f-0.5 



-5-0.7 



Ö 





19 



5 / 9 16 



66.2 









15° 



-5-0.4 



-5-0.6 



0 





20 



6 / 9 16 



64.0 









20° 



-=-0.5 



-5-0.5 



0 





21 



9 / 6 17 



34.0 



32 



0.57 



0.40 



16° 



1.9 



3.4 



5.4 



1—2 



99 



» 



34.0 



33 



0.57 



0.47 



ID 



1.1 



1.7 



1.7 



1—2 



23 



» 



34.0 



32 



0.57 



0.67 



16° 



-5-1.1 



-5-1.4 



0 



1-2 



24 



"/e 17 



12.0 



25 



0.54 



0.43 



ca. 25° 



4.2 



4.0 



7.5 



l-(2) 



25 



» 



6.4 



24 



0.54 



0.43 



ca.25° 



8.6 



8.1 



18 



l-(2) 



26 



12 / 6 17 



14.0 



28 



0.58 



0.41 



24° 



5.2 



5.5 



48 



2 



27 



» 



14.0 



26 



0.58 



0.42 



25° 



5.2 



5.1 



20 



2 



28 



» 



14.0 



25 



0.58 



0.44 



24° 



4.8 



4.7 



10 



2 



29 



13 /e 17 



4.4 



26 



0.54 



0.47 



24° 



7.4 



6.7 



54 



2 



30 



» 



35.6 



26 



0.54 



0.60 



24° 



-5-0.8 



-5-0.6 



0.7 



2 



31 



25 /6 17 



19.8 



30 



0.55 



0.47 



23° 



1.6 



1.5 



4.2 



2 



32 



» 



9.8 



29 



0.55 



0.48 



24° 



3.0 



2.7 



9.0 



1 



l ) Concerning the values for the C0 2 content of the air cf. page 227. 



