152 Dr. F. Darwin and Miss D. F. M. Pertz. [June 15, 



Experiment 59p; October 25, 1910. — Tropseolum (in pot). At a south 

 window exposed to dull light, no sunshine. 



Time. 





E. 



A E. 



A.M. 



Seconds. 







10.45 



15 



66 



8-1 



50 



15 







57 



13 



76 



8-7 





11 









10 



100 



10 





9-8 

 8-5 



118 



10 -9 



12 



Cut petiole low down. Greased the cut end. 



12 5 



7 



142 



11 -9 



13 



6-5 







1 ^ 



5-2 



192 



13 9 











21 



3-5 



286 



16 -9 



2 >7 



3 









2 



500 



22 -4 





1 -8 



555 



23 -6 



40 



2 



500 



22 -4 



50 



2 



500 



22 -4 





1-8 



555 



23 6 



P.M. 









12.8 



1 -1 



909 



30 -1 



14 



1 -25 







18 



1 



1000 



31 -6 



43 



1-4 



714 



26 '7 



50 



1 3 



769 



27 -7 



1.0 



1 -5 



666 



25 -8 



3.27 



25 "4 





6-2 



53 



48 



20 



4-5 



12 2 3 



Fig. 9.— Experiment 59p. Cutting the leaf-stalk of Tropoeolum. The curve is 

 constructed from the square root of the rate of flow. 



The result must be considered as somewhat rough, since when the fall 

 of the water column is so rapid as at 12.18, it is not possible to time it with 

 accuracy. Nevertheless, we may safely assume that the rate of now 



