RESPONSE OF ISOLATED VEGETAL NERVE 



477 



normal negative response. The distance was next reduced 

 still further, namely, to -5 cm., with the result that the 



FIG. 287. Photographic Record of Conversion of the Abnormal 

 Diphasic into Normal Negative, after Tetanisation, T, in Nerve of 

 Fern 



FIG. 288. Photographic Record showing how the Abnormal Positive 

 Response is converted through Diphasic into Normal Negative, by 

 the Increasing Effective Intensity of Stimulus, due to Lessening the 

 Distance between the Responding and Stimulated Points 



responses now became normal negative (fig. 288). It is thus 

 seen that there is a continuity of response in the same 



