178 



Professor Jagadis Ch under Bose 



[May 29, 



Comparison betweex Sensitiveness of Man and Plant. 



We have next to fiad some method of stimulation which will not 

 cause any mechanical disturbance to the plant. In connection with 

 this I made an important discovery which demonstrates the identical 

 characteristics of excitation in plant and animal. In the animal 

 tissue a constant electric current causes very characteristic excitations 



PiQ. 3. — Upper Part of Resonant Recorder (from a 

 photograph). Thread from clock (not shown) passes 

 over pulley P, letting down recording plate. S', screw 

 for adjustment of distance of writing-point from recording 

 plate. S, screw for vertical adjustment. T, tangent 

 screw for exact adjustment of plane of movement of 

 recorder, parallel to writing-surface. V, axis of writer 

 supported perpendicularly at centre of circular end of 

 magnet. C, reed. M, micrometer screw for adjustment 

 of length of reed. 



at the moment of " make " or " break " of the current. In most cases 

 there is no excitation during the continuation of the current. At 

 the " make " excitation takes place only at the kathode ; at the 



