250 SELIG HECHT 
TY DUTES 
Fig. 11 Analysis of records. Curve 7, siphon rim closure; curve 6, body 
bending. 
takes place slowly during the much longer period of the fourth 
phase. The actual time occupied by the different. periods is 
given in the accompanying table. In table 3 there is represented 
an analysis of three records of the movements of one animal 
produced under the same conditions and intensity of stimulation. 
The appearance and duration of the second and third phases of 
the record depend in the main on the intensity of the stimulus 
which produces the body contraction. The more intense the 
stimulus, the longer do the two phases last, their greater duration 
showing itself in the maintenance of the condition of maximum 
contraction. Compare, for example, the values in table 3 
(also fig. 8) with curve 6 of figure 11. Although both were 
TABLE 3 
Body Contraction. Exp. VI.23 .1 
DURATION OF PHASES, SECONDS 
1 2 3 4 
I 7.3 19.4 26.3 128.9 
II 6.8 17.3 23.6 143.5 
III 6.8 16.8 18.4 96.8 
