l86 CHAP. XVII. WIRELESS STIMULATION 



Effect of alternating electric field on growing organs. — The 

 experiments were carried out under two different methods 

 of producing the alternating field. In the first method 

 two insulated plates are connected with the terminals of 

 the secondary coil, the plant being placed between the two. 

 The intensity of the stimulation is in this case less than 

 when the plant is placed in the interior of a spiral. 



Fig. io8. Effect of high-tension alternating field on growth. 



Acceleration (up-curve) under moderate stimulation (Wheat). 

 Record under condition of balance. Successive dots at 

 intervals of lo seconds. 



Experiment 112. — A seedling of Wheat was chosen for 

 this experiment, its rate of growth being relatively feeble 

 (0-19 ^ per second). The specimen was mounted on the 

 Balanced Crescograph, the horizontal line at the beginning 

 showing the record under condition of balance. On sub- 

 jecting the plant to the action of the alternating field of 

 moderate intensity at the point marked with arrow, the 

 balance was upset within a minute and a half of the applica- 

 tion of stimulus. There was an acceleration of growth 

 as exhibited by the up-curve (fig. 108). Another Wheat- 

 seedhng was so subtonic that growth was at a standstill, 

 the record being horizontal without balance. The high- 



