1904.] Notes on the Statolith Theory of G-eotropism. 



479 



Thus " scattered and apical " means that the starch is to a great 

 extent diffused through the cells, but that in a good many cases the 

 starch has accumulated at the apical ends of the cells. On the other 

 hand "apical and scattered " means that the starch is apical rather than 

 scattered. 



Table T. 



Plant. Centrifugal 

 force. 



Temperature. 



Position of starch. 



I 



g- 



Setaria ! -02 



„ . , -02 



m | 0-02 



„ ! 0-02 



... -02 



i 



°C. 

 14 

 16 

 17 

 17 



20 



Scattered and apical. 



Scattered, apical, and some basal. 



Scattered. 



Scattered, some apical, also some 



basal. 

 Apical and scattered. 



The general conclusion to be drawn is that with 0*02 g. there is a 

 tendency, though a very slight one, for the starch to move radially and 

 accumulate in the apices of the cells. 



In Table II, the seedlings were placed both apex outwards and apex 

 inwards ; the period of exposure was about 22 hours. 



Table II. 



Plant. 



Centrifugal 

 force. 



Temp. 



Apex. 



Starch. 





g- 

 0-03 



°C. 

 22 -0 



Out 

 In 



Two specimens, basal and 

 scattered ; one specimen, 

 many cells apical. 



Scattered and basal. 







0-03 



18-5 



Out 

 In 



Scattered and apical. 

 Scattered and basal. 







0-04 



13—18 



Out "1 

 In ; 



No distinct difference. 



Sorghum and 



0-04 



16—20 



Out 



More apical than basal. 



Setaria 



(about) 





In 



Scattered and basal. 





0-04 



18—21 



Out 



Apical and scattered. 

 Basal and scattered. 





In 





0-05 



21-0 



Out 

 In 



Scattered, many cells apical, 



but bavsal in parts. 

 Much scattered. (Not very 



distinct difference between 



" out" and "in.") 





Thus out of six experiments there was only one in which there was no 

 difference between the starch in the seedlings pointing outwards and in- 



2 L 2 



