420 



LIFE MOVEMENTS IN PLANTS 



with the earth (Fig. 153). The distance between the trans- 

 mitting and receiving aerial was about 200 meters, the 

 maximum length permitted by the grounds of the Institute. 



MECHANICAL RESPONSE OF MimOsa. 



Experiment 159. — One of the leaves of Mimosa was 

 connected with the aerial by means of a chin tinsel of 

 loose wire, which did not interfere with the free move- 

 ment of the leaf. This latter was attached to the recording 

 lever. Wireless signals induced a responsive fall of the 

 leaf (Fig. 154) which was gradual as under action of 

 light, and not so abrupt as under a meciianical blow. 



Fig. 154. 



Fig. 155. 



Fig. 154. — Mechiinical response of leaf of Mimosa to electric wave. 

 Fig. 155. — Electric response of Mimosa pudica to wireless stimulation. 



THE ELECTRIC RESPONSE. 



Experiment 160. — The leaf of Mimosa was in this 

 experiment held securely, and two electrical connections 

 made, one with the less excitable upper and the other 

 with the more excitable lower half of the pulvinus. The 



