February] 



HOTAMCAL GAZETTE 



172 



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 ill 



Moisture and acidity in Vicia Faba shoots exposed to gravity 



Time of 

 exposure 



15 minutes.. 

 15 minutes.. 

 30 minutes.. 

 30 minutes.. 

 45 minutes.. 

 45 minutes. . 

 1 hour. . . . 



1 hour. . . . 



2 hours.. . . 



2 hours. . . . 



3 hours. . . . 

 3 hours. . . . 

 5 hours. . . . 

 5 hours. . . . 

 7 hours. . . . 

 7 hours.. . . 

 9 hours. . . . 

 9 hours .... 



11 hours.. . . 

 11 hours.. . . 

 13 hours. . . . 

 13 hours.. . . 

 17 hours.. . . 

 1 7 hours. . . . 

 21 hours.. . . 

 21 hours. . . . 



Moisture 



Upper flank 

 (percentage) 



Lower flank 

 (percentage) 



Difference 

 (percentage) 



+ O.07 



— O. 12 

 -O.85 

 + O.O0 

 + O.I7 

 + 0. IO 

 -O.O3 

 + O.O3 



+ O.I5 

 + O.32 

 + O.3O 

 + 0. 20 



— O.O7 



Acidity in cc. 0.05 N NaOH 



PER GM. FRESH WEIGHT 



Upper flank 



Lower flank 



+O.33 

 + 0.00 

 -0-35 



+ 0. 11 

 — o. 14 



-0.08 



+0.02 



+0.07 



1 .40 



1. 18 



I . IO 



0.99 

 I 05 



1 .07 



1. 16 



1 . 20 



1. 54 



i-39 

 1. 18 



1 15 

 1.23 

 1. 18 

 1 .02 

 113 

 113 

 1 25 



1 13 

 113 

 ii5 

 115 

 1 13 

 1.32 



115 

 0.97 



Difference 



15 

 18 



15 

 05 

 12 



O.94 



I 



I 



19 

 ,l6 



1.58 



i-37 



1 . 20 

 1 . 10 

 1. 17 



I . IO 



0.91 



1.08 

 1. 14 



I . 22 



III 



I. 19 



I . 12 



I 



I 



I 



-0.2: 



. 12 

 .26 



•41 



I . I I 



°-95 



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 

 ground in a mortar with sand which had been treated with HC1 

 and washed free from acid. Fifty cc. of water was added and the 

 mixture titrated to phenolphthalein with 0.05 N NaOH. Blanks 



