PULSATIONS OF DESMODIUM GYRANS 297 



average rate being -44 mm. per second. The maximum rate 

 of the up movement was -56, and the average rate '3 mm. 

 per second. 



In fig. 144 is shown a record of two successive pulsations 

 obtained with a different specimen. The amplitude is 



Fig. 144. — Records of two pulsations of a different specimen of Desmodium 

 reduced to f. Successive dots are at intervals of 2 seconds. 



reduced to two-thirds in the diagram and the successive dots 

 are at intervals of 2 seconds. A detailed account is given 

 in the accompanying table of the rates of movement 

 exhibited by the two specimens : — 



Table showing Rates of Movement at Different Phases of 

 Pulsation of Desmodium 



I give another series of records obtained with a vigorous 



