ELECTRIC RESPONSE I29 



one with the midrib and the other with a distant in- 

 different point on the lamina. Radio-thermal stimulation 



Fig. 71. Diagrammatic representation of electromotive response 

 to indirect stimulation of effectively increasing intensity. 



was successively applied, the point of application being 

 gradually brought nearer from S to S2 (fig. 71). When the 



Fig. 72. Positive, diphasic, and negative electric responses 

 (Bryophyllum calycinum). 



