NATURAL RHYTHM. 



153 



of the seorments than in that of others. I therefore 

 observed the segments over five-minute intervals, 

 instead of one- minute intervals as on the previous 

 day. The following is a sample of several observa- 

 tions, all yielding the same general result. 



I now transferred all the segments to fresh sea- 

 water, with the following results : — 



Rhythm during first quarter of an hour immediately after trans- 

 ference, in five-mill ute intervals. 



Time. 



First 5 minutes. 

 Second 5 minutes 

 Third 5 minutes. 



Segment i. 



139 (irregular). 





 100 (regular). 



Segment J. 











39 (irregular). 



Segment i A. 



83 (regular). 

 68 



Segment | B. 



20 (irregular). 

 75 (regular). 

 69 



