172 



BOTANICAL GAZETTE 



[FEBRUARY 



as bending proceeds the convex flank contains more water. The 

 same difference is indicated in the time of exposure set, but because 

 of irregularities in the response of the nodes, it is not so obvious. 



The results with Vicia Faba shoots are given in table III. 

 The fresh samples weighed about 1 gm. They were dried to con- 

 stant weight at 100-102 C. The differences are so small and so 



TABLE III 



Moisture and acidity in Vicia Faba shoots exposed to gravity 



Time of 

 exposure 



IS 

 15 



30 

 45 



45 



1 



1 

 2 



2 



3 

 3 

 5 

 5 



7 



7 



9 



9 

 11 



11 



13 



13 



17 



17 

 21 



21 



minutes, 

 minutes, 

 minutes, 

 minutes, 

 minutes, 

 minutes, 

 hour. . . 

 hour. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours . . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. . . 

 hours. , . 

 hours. . . 

 hours. . . 

 hours. . . 



Moisture 



Upper 



flank 



Lower flank 



(percentage) 



(percentage) 



93-35 



93 35 



93 



33 



93 



33 



92 



43 



92 



5o 



93 



25 



93 



13 



92 



.48 



9i 



63 



92 



67 



92 



73 



93 



02 



93 



19 



92 



.40 



92 



So 



9i 



53 



9i 



5° 



93 



00 



93 



03 



92 



5° 



92 



65 



92 



13 



92 



45 



92 



50 



92. 



80 



92 



95 



93 



15 



92 



.70 



92 



63 



92 



.60 



92 



.60 



92 



37 



92 



.70 



92 



.87 



92 



93 



92 



35 



92 



.00 



92 



65 



92 



65 



92 



.69 



92 



.80 



92 



.87 



92 



73 



92 



97 



92 



89 



92 



•25 



92 



.27 



91 



.60 



9i 



.60 



93 



00 



93 



.07 



Difference 

 (percentage) 



+O.07 



— O.I2 

 -O.85 

 +O.06 

 +O.17 

 +O.10 

 -O.03 

 +O.03 

 +O.15 

 +O.32 

 +O.30 

 + 0. 20 



— 0.07 



+0 33 

 +0.06 



-o 35 



+0.11 

 —0.14 

 -0.08 

 +0,02 



+0.07 



Acidity in cc. 0.05 iV XaOH 



PER GM. FRESH WEIGHT 



Upper flank Lower flank 



1.40 



1. 18 

 I. IO 



99 



1.05 

 1 .07 



1. 16 



1.20 



1 54 



i-39 

 1. 18 



ii5 

 1.23 



1. 18 

 1 .02 



i- r 3 



1 13 



125 



1 13 



1 13 



1 15 



115 



1. 13 

 1.32 



0.97 



1.1 



1 .1 



115 

 105 



1. 12 



0.94 



1. 19 



1. 16 



158 



1.37 



1 .20 



1 .10 



1. 17 

 1. 10 



0.91 



1.08 



1. 14 



Difference 



025 



I 

 I 

 I 

 I 

 I 



22 

 II 



19 

 12 



12 



1.26 



1. 41 

 I .II 



o-95 



+0.05 

 -f-0.06 

 +0.07 



—0.13 



+0.03 



—0.04 

 +0.04 

 —0.02 

 +0.02 

 —0.05 

 —0.06 

 -0.08 



— 0.11 



— 0.05 

 +0.01 

 —0.03 



— 0.02 



+0.06 



— 0.03 



— 0.03 



+0.13 

 +0.09 



— 0.04 



— 0.02 



irregular as to be insignificant. At the periods from i to 9 hours the 



convex side seems to contain, in general, a little more moisture, but 



the differences are too slight to serve as a basis for any conclusions. 



For the determination of titration acidity the samples were 



mortar 



from 



the 



mixture titrated to Dhenok)hthalein with o.ck N NaOH. Blanks 



