MOVEMENTS OF PLANTS 45 



transmission of an influence from the percipient 

 to the motor region. 



Transmission of a stimulus has long been known 

 in Mimosa, but, in the far more important curvatures 

 which we are now considering, it was not known to 



Fig. 3. — Narcissus flowers. 



exist before the publication of the Power of 

 Movement in Plants. There is an experiment of 

 Rothert's^ which we make in class-work at Cam- 

 bridge, and which only differs from my father's 

 classical experiment in the fact that a much more 

 perfectly adapted plant is employed. The plant 

 in question is a grass, Setaria, which has a remark- 



^ Cohn's BeitrAge, 1894. 



