1906.] 



On the Transpiration Current in Plants. 



51 



traversed in one hour, while the abscissae indicate the pressures, considering 

 a head equal to the length of the branch as unity. 



Table IV. 



9° 



So 



6o 



Head 



Time 



Velocity per hour 





traversing 3 cm. 



at unit head. 



centimetres. 



minutes. 



centimetres. 



30 



2 



9-0 



30 



3-0 



6-0 



27 



2-0 



10-0 



27 



2 5 



8-0 



24 



3 75 



6-0 



24 



3-5 



6-4 



24 



3 5 



6-4 



21 



4-5 



5-7 



18 



5-25 



5-7 



18 



4-5 



6-6 



18 



4 75 



6-3 



15 



4-5 



8-0 



15 



4-5 



8-0 



12 



5 5 



8-2 



12 



7-0 



6-3 



12 



5-5 



8-2 



9 



10-25 



5-8 



9 



7-75 



7-7 



9 



9-5 



6-3 



6 



12-75 



7-0 



6 



13-0 



6 9 



3 



25-5 



7-0 







1 | 











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p 



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