NATURAL RHYTHM. 157 
was less than that of the larger as regards the de- 
privation of nutriment, it was greater than that of 
was performed on the same specimen as the one mentioned in 
the text to show the general relationship between the duration of 
the pauses and that of swimming bouts. (See last foot-note.) 
Immediately after bisection. 
3A, z B. 
Numberofpu | seconds of rest, |] Number ot PU | seconds of rest 
56 10 82 180 
150 150 51 20 
68 335 14 60 
130 3 13 50 
46 45 46 Be 
a4 10 38 65 
99 66 18 45 
103 360 23 60 
12 t 35 = 
105 70 
Pauses now become longer, and 
swimming bouts shorter. 
Twenty-four hours after the operation. 
yA, $ B. 
Number of pul- Seconds of rest. Number of pul- | seconds of rest. 
sations. sations. 
2 363 50 20 
12 362 81 25 
4 666 37 101 
25 300 2400 60 
But although 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 case 
8 
