518 



LIFE MOVEMENTS IN PLANTS 



Effect of variation of iem2Je mature : Experiment 201. — 

 iSpecial arrangement was made for gradual variation of 



Fig. 187. — Simultaneous record (a) of variation of temperature, (6) of 

 up or down movement of leaf of Mimosa, and (c) of variation of torsion. Rise 

 of temperature is attended by fall of leaf and diminution of torsion, fall of 

 temperature .inducing the opposite effent. , 



temperature in the plant chamber. Two rectangular metallic 

 vessels each 50 x 30 x (i cm. were placed on opposite sides 



