NATURAL RHYTHM. 



157 



was less than that of the larger as regards the de- 

 privation of nutriment, it was greater than that of 



^^.ls performed on tho same specimen as the one mentioned in 

 the text to show the general I'elationship between the duration of 

 the pauses and that of swimming bouts. (See last foot-note.) 



Immediately after bisection. 



Twenty-four hours after the operation. 



But althnngh in the case of Sarsia the lesser endurance of the 

 smaller segment than of the larger cannot be regarded as a 

 general rule, it may be so regarded, as already stated, in the cas9 



