340 



LIFE MOVEMENTS IN PLANTS 



the resulting response is recorded by means of the 

 Oscillating Recorder (Fig. 123). 



Fig. 123. — The Oscillatiny Recorder (From a. photograph). 



The first record was obtained under a given intensity, 

 and the second, under an intensity twice as great, The 

 tropic etl'egts are seen to increase with the intensity 



