EHYTHMIC PULSATION 



327 



85 



^ 



Sec. 



zo 



30 



3 5° 40° C. 



Temperature. 



Fig. 22 Holothuria captiva. Relation of pulsation rate, in the intact animal, 

 to temperature. The numbers on the curve indicate the succession in which 

 the observations were taken. 



a temperature of, say, 10°, produced an anaesthetised-like con- 

 dition which persisted for a considerable time after its removal 

 to some higher temperature and thermal equihbrium had in all 

 probability been reached. By way of illustration: 



Experiment 39.2. June 24. Stichopus moebii, 27 cms. long; 78 sec- 

 onds for 10 pulsations at 25.0°; slowly cooled. 



Experiment 34-1 June 21. Stichopus moebii, 29 cms. long; 76 sec- 

 onds for 10 pulsations at 25.0°; cloaca amputated; during the following 

 18 minutes, slowly heated up to 30°; held at 30° for 10 minutes, with 

 the following results. 



