. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 82 FRANK A. I'.K'MU \", JR. AND YOUNG H. PARK RESULTS In Figure 1A is plotted the mean response of the worms relative to that of the ones during the 15 minutes of exposure to the experi- mental fields, as a function of phase of moon. A monthly variation is clearly sug- gested, with a maximum difference occurring over full moon and minimum, even possibly a reversal of the difference, over new moon. The comparable variations of relative paths in the two field-strengths with phase of moon during the fi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 82 FRANK A. I'.K'MU \", JR. AND YOUNG H. PARK RESULTS In Figure 1A is plotted the mean response of the worms relative to that of the ones during the 15 minutes of exposure to the experi- mental fields, as a function of phase of moon. A monthly variation is clearly sug- gested, with a maximum difference occurring over full moon and minimum, even possibly a reversal of the difference, over new moon. The comparable variations of relative paths in the two field-strengths with phase of moon during the first 15 minutes following removal of the experimental field, and during the last 10 minutes after removal, are shown in Figures IB and 1C, respectively. A monthly variation appears to persist for a time hut to have disappeared nearly completely by 20 to. NM FM NM PHASE OF FM NM MOON FIGURE 2. Variation in mean path of the worms (controls) with phase of moon during their initial 10-minute period while in the natural ambient geophysical field. The mean monthly cycle is repeated. 25 minutes after the field removal. The rate of the disappearance of the monthly variation in this difference strikingly coincides with the rate of loss of the general after-effect reported earlier (Brown and Park, 1965). The results pertaining to general after-effects which have been described pre- viously had suggested that during this 7-month study a mean, overall response to the two experimental field strengths occurred chiefly for the reversed one. However, evidence was advanced to indicate that the worms also displayed a very definite response to the reversed field but that the character of the response varied with time more strikingly than did response to the field, even changing in sign. The results suggested an annual variation. From the present study it became evident upon examining separately the responses to the two strengths of the magnetic fields, together with
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