EFFECT OF DEPLETION OF ENERGY 313 



continuous record from the third to the sixth hour is seen 

 in fig. 142, given on page 294 ; the series of records are to 

 be read from below to above each series, lasting for one hour 

 and twenty minutes. It is seen that the amplitude is 



p IG . I5 6. — Effect of depletion of energy on the pulsation of isolated 

 specimen of Desmodium gyrans. 



practically constant ; the period is also constant in the first 

 two series, there being twenty-seven pulsations in each 

 in the course of eighty minutes. The period is, however, 



Fig. 157. — Gradual stoppage of pulsation in isolated leaflet 

 of Desmodium. 



slightly lengthened in the third series, there being twenty-six 

 pulsations in the given time. The record was continued 

 (fig. 156) during the seventh, eighth, and part of the ninth 

 hour. In these two series, the effect of the depletion of 



