n6 RESPONSE IN THE LIVING AND NON-LIVING 



carbonate then washed off, the increased sensitiveness 

 conferred disappears gradually. Again, if we apply 

 Na 2 C0 3 solution to a fresh point, the sensitiveness 

 gradually increases. There is another further interesting- 

 point to be noticed : the beginning of response is earlier 

 when the application of Na 2 C0 3 is fresh. 



We have thus a wire held at one end, and successive 

 uniform vibrations at intervals of one minute imparted 



FIG. 68. CONTINUOUS TRANSFORMATION FROM NEGATIVE TO POSITIVE 

 THROUGH INTERMEDIATE DIPHASIC KESPONSE 



Thick dots represent the times of application of successive stimuli. 



to the wire as a whole, by means of a vibration head 

 on the other end. 



Owing to the after-effect of previous application 

 of Na 2 C0 3 the sensitiveness of B is at the beginning 

 great, hence the three resultant responses at the be- 

 ginning are negative or downward. 



Dilute solution of Na 2 C0 3 is next applied to A. The 

 response of A (up) begins earlier and continues to grow 

 stronger and stronger. Hence, after this application, 

 the response shows a preliminary positive twitch of A 

 followed by negative deflection of B. The positive grows 



