142 LIFE AND WORK OF SIR JAGADIS C. BOSE 



The Resonant Recorder is shown complete and in use upon 

 the accompanying illustration (Fig. n). An actual record is 



FIG. ii. General view of the Resonant Recorder and the electrical 

 connections by which excitatory shock of a definite duration is 

 given to the plant ; duration of shock determined by metronome, 

 which completes electric circuit. 



given in the next figure which measures the time taken by 

 the plant to perceive and answer to the shock given at 



