TIME-RELATIONS OF RESPONSE 43 



course of a second after the shock. The recovery was 

 completed in the course of only 3 minutes. 



Response of Neptunia. — In marked contrast with the 

 quick reaction of Biophytum, I may cite the very slow action 



Fig. 15. — Record of response of leaflet of Biophytum. 

 Vertical marks below record indicate intervals of "5 

 minute. 



of the primary leaf of Neptunia oleracea. In fig. 16 is given 

 a record of its response under an exciting induction-shock of 

 moderate intensity. The clock-interrupter was so adjusted 

 that the successive dots should be at intervals of half a 



Fig. 16. — Response of leaf of Neptunia. Successive dots are at 

 intervals of '5 minute in the contractile portion, and 1 minute 

 in the recovery portion of curve. 



minute during contraction, and at intervals of a minute 

 during recovery. It will be seen that the maximum 

 fall was attained 3 minutes after stimulation, and the 

 recovery was not completed even after 40 minutes, which 



