PHYSIOLOGY OF ASCIDIA ATRA LESUEUR 255 
W350 1:40 50 72:00 12/0 12:20 12:30 
Fig. 13 Graphie record of occurrence of spontaneous movements. 
Comparison with the other records (figs. 13 and 14) shows 
that the complete body movements occur at intervals similar 
to their rhythmic appearance spontaneously. The significance 
of this type of experiment I believe to be as follows. After the 
Fig. 14 Records of rhythmic, spontaneous movements. The base line 
marks five minute intervals. 
SEDba is NY Ys) (9c ad Ue WW Wd Gt Dg RTGS, 
24.1 C 
1b eee tl | 
WK4A/A 
Fig. 15. Records of rhythmic, spontaneous movements. The base line 
marks five minute intervals. 
