286 RESEARCHES ON IRRITABILITY OF PLANTS 



shown the multiple responses obtained in Averrhoa carambola 

 under a single stimulation caused by strong induction-shock. 

 Here there are six responses in the course of 15 minutes, 

 the average period of a single pulsation being 2-5 minutes. 

 We have also seen multiple responses induced in Bio- 

 phytum under the action of constant current (cf. fig. 124). 

 Multiple responses also take place in Biophytum and in 

 Averrhoa under the action of constant light. I give a 



Fig. 138. — Multiple response under the action of single strong 

 thermal shock. 



record (fig. 137) in which is seen the occurrence of five 

 multiple-responses in the course of 8 minutes under the 

 continued action of light from an arc-lamp. 



I have also obtained multiple responses under other 

 forms of strong stimulation. In fig. 138 is given a record 

 of multiple responses induced by the action of a strong 

 thermal stimulus. In certain other cases I obtained with 

 Biophytum as many as sixteen recurrent responses under a 

 single thermal shock. 



In fig. 139 is seen a series of multiple responses induced 

 by strong chemical stimulation. This was caused by 



