i82 RESEARCHES ON IRRITABILITY OF PLANTS 



6 seconds. A statement of the results of two different 

 experiments is shown in Table I. 



Table I. — Showing Difference of Times of Transmission through 

 Stem and Petiole 



Chemical stimulus. — The next record was taken under 

 the stimulus caused by the application of a drop of hydro- 

 chloric acid on the petiole, at a distance of 30 mm. from the 



Fig. 97. — Positive response followed by negative in 

 Biophytum by the application of chemical stimulus. 

 Successive dots at intervals of i second. 



responding leaflet. The record (fig. 97) shows that the 

 positive response occurred i second and the negative 

 14 seconds after the apphcation of the stimulus. 



Induction shock. — Stimulus was applied on the petiole 

 at a distance of 30 mm. The positive response took place 



