Page:Researches on Irritability of Plants.djvu/66

Rh 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

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

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