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



Experiment 75. 



Time. 



Postometer. 



Rate, corrected 



Porometer. 



Eate. 



A/Bate. 



A.M. 



Seconds. 





Seconds. 







10.57 



50 



21 9 









11.5 







8-7 



1149 



33 -9 



13 







7-9 



1266 



35 -6 





48 



22-4 









20 







7-2 



1389 



37 "3 



33 







7 



1429 



37 -8 



39 



Bark 











43 







6-8 



1471 



38 -4 



45 



42 



24 -7 









47 







7 



1429 



37 -8 



53 



52 



19 -2 



8 



1250 



35 -4 



57 



57 -5 



17-4 









58 







8-5 



1176 



34 -3 



P.M. 













12.4 



67 -5 



14-8 









8 







12 



833 -3 



28 -9 



11 



79 



12 -7 









18 



82 



12 -2 









26 







15 



667 -7 



25 -8 



30 



96 



10 -4 









44 







20 



500 



22 -4 



47 



110 



9-1 









56 







25 



400 



20 



58 



117 



8-5 









1.49 







66 



151 -5 



12 -3 



57 



159 



6 3 









2.0 







76 -8 



130-2 



11 -4 



3 



174 



5-7 









5 



Light 











11 







81 -3 



123 



11 -I 



12 



144 



5 9 









19 



128 -6 



6-7 









32 



56 -8 



7-3 









46 







33 -5 



298 -5 



17 -3 



47 



98 -6 



8-4 









59 







25 -4 



393 -7 



19 -8 



3.2 



115 



7-0 









12 







27 -8 



359 -7 



19 -0 



30 







45 



222-2 



14 -9 



35 







53 



188 -7 



13 -7 



46 







87 "5 



114 3 



10 -7 



49 



290 



3-0 









53 







123 



81 -3 



9-0 



The most striking departure of the stomatal curve S (the square root 

 of rate of flow) from the transpiration curve T is between 2 and 4 p.m. 

 This will he seen if the salient points in the two curves are reduced to a 

 common scale by assuming that, at one of these points (e.g., the end of 

 the dark period), both transpiration and y/ flow are equal to 1, and 

 calculating the other points on that basis. 



