232 



CHAP. XXI. THE ' PRAYING PALM 



Palm was very much less than that of the Faridpore, presum- 

 ably because its angle of incUnation to the vertical was very 

 much smaller, and the tree was therefore less effectively 

 subjected to the stimulus of gravity. 



Fig. 135. Record of the Sijbaria Palm from noon for 24 hours. 

 Successive dots at intervals of 15 minutes. 



It will be shown in the next chapter that a unidirec- 

 tional movement cannot take place under diffuse stimula- 

 tion which acts on all sides of an organ, unless it has been 

 rendered anisotropic. There are reasons to beheve that 

 the stimulus of gravity is effective in inducing anisotropy. 



The next question is — Is the diurnal movement confined 

 only to the Date Palm or do other Palms exhibit similar 

 movements ? 



Diurnal Movement of Kentia Palm 



In answer to this question I planted in the grounds of 

 my Institute a Kentia Palm at a considerable inchnation 



