OBSERVATION BY RHEOTOME ON ELECTRIC RESPONSE 53 



We thus see that there is a rhythm in these multiple 

 responses, the successive maxima being here found to 

 occur at periods which constitute multiples of '15 second. 

 The third of these rhythms may be presumed to be missing, 

 owing to the fact that no observation was taken at -45 second, 

 as, at the time when these experiments were carried out, 

 I was unaware of the existence of such rhythmicities. It was 

 by the curves plotted from these data that my attention was 

 first drawn to their occurrence. 



It will thus be seen that the electro-motive variation is 

 initiated practically simultaneously with the impact of 

 stimulus on the organ. With moderate stimulus, the maxi- 

 mum variation is reached within two-tenths of a second, or 

 this period may be made still shorter by the employment 

 either of a more quickly reacting tissue, or of a greater 

 intensity of stimulus. Strong stimulation is apt to give rise 

 to rhythmic multiple responses. 



