WORK OF THE SHOOT 



99 



the stomata. Some idea of this force may be obtained 

 from the following experiment (Fig. 61). Take a long,, 

 thick-walled glass tube fitted at one end with a rubber 



Fig. 60. Experiment 

 to show the pressure 

 of Exudation (Jost). 



Fig. 6i. Experiment to 

 demonstrate the Suction 

 Action of Transpiration 



(Jost). 



stopper. Through a hole in the centre push the end of a 

 Laurel shoot, selecting one thick enough to fit tightly. 

 Then fill the tube completely with water and, placing the 

 thumb over the open end to prevent escape of water, put 

 this end into a trough of mercury. Remove the thumb and 



G 2 



