1920] 



PHILLIPS— GEO TROPISM 



177 



to be impo! 

 of bending. 



same may 



Summary 



Definite moisture changes accompany geotropic bending in corn 

 nodes. During the early stages of bending there is a greater 

 percentage of moisture in the concave flank. When the process 



TABLE VI 



Analyses of Vicia Faba shoots exposed to gravity 



(in percentage of fresh weight) 



Time of 

 Exposure 



30 minutes. . 



1 hour. . . . 



2 hours 



4 hours. . . . 



Upper 

 flank 



Lower 

 flank 



Difference 



Glucose 



2.16 



I 47 

 I.56 



1-37 



2.15 



1 .40 



1.67 



1. 41 



— o 

 — o 



+0 

 +0 



01 



07 



II 



04 



Upper 

 flank 



Lower 

 flank 



Difference 



Sucrose 



O.450 

 O.187 



0.22T 

 0449 



I 



30 minutes. . 



1 hour. . . . 



2 hours. . . . 

 4 hours. ... 





Total sugars 





2.61 



1.65 



1.78 

 1.82 



2.43 

 1 .69 



1 94 



1.70 



-0.18 

 +0.04 

 +0.16 

 —0. 12 



0.279 



0.287 



0.269 



0.289 



— 0.171 

 +O.IOO 

 +0 048 



—0.160 



M oisture 



30 minutes.. 



1 hour. . . . 



2 hours. . . . 

 4 hours. . . . 



Soluble nitrogen 



O.294 

 O.261 

 O.279 

 O.264 



O.301 

 0.259 



O.258 



+0 



— o 

 — o 



007 

 002 

 026 

 006 



91.57 



92 54 

 91 .62 



9i 93 



9239 

 92.46 



91.82 

 92.13 



+0.82 

 -0.08 

 +0. 20 

 +0.20 



Insoluble nitrogen 



O.302 



0303 

 0.3H 

 0.349 



0.284 



0.306 



0.296 



0.324 



—0.018 



+0.003 



—0.018 



-0.025 



has developed the percentage of water is greater in the convex 

 flank. 



Although titration acidity is greater in the convex flank, the 

 differences are very slight. The results on hydrogen ion concen- 

 tration, although uniform in direction, are not numerous enough to 

 serve as a basis for conclusions. 



It is impossible, with the data obtained, to correlate the geo- 

 tropic bendinff of etiolated Vicia Faba shoots with differences in 



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