228 



CHAP. XXI. THE ' PRAYING PALM 



Fig. 134. Record of diurnal movement of the ' Praying ' Palm 



(Phoenix sylvestris). 



Thermographic curve for 2 4 hours, commencing at 9 in the evening, 

 is given in the upper record in which the fall of tempera- 

 ture is represented by an up-curve. The corresponding 

 diurnal curve of movement of the tree is given in the lower. 

 Successive dots at intervals of 1 5 minutes ; thick dots, 

 intervals of an hour. 



