. The Biological bulletin. Biology; Zoology; Marine biology. RHYTHMS IN MAGNETIC RESPONSE 383 more than one series was recorded for any single hour of a given day, these were combined to yield a single average value. The average direction and amount of turning of the snails as a function of hour of the lunar day is indicated in Figure 1 for the control snails, those in the artificially augmented N-S magnetic field and those in the E-W field. Each of the three differently treated groups is dealt with here as a separate sample. Not only is there a clear mean lunar-day cycle of. Z-8 Z4-7 NADIR ZE
. The Biological bulletin. Biology; Zoology; Marine biology. RHYTHMS IN MAGNETIC RESPONSE 383 more than one series was recorded for any single hour of a given day, these were combined to yield a single average value. The average direction and amount of turning of the snails as a function of hour of the lunar day is indicated in Figure 1 for the control snails, those in the artificially augmented N-S magnetic field and those in the E-W field. Each of the three differently treated groups is dealt with here as a separate sample. Not only is there a clear mean lunar-day cycle of. Z-8 Z4-7 NADIR ZENITH LUNAR DAY NADIR Figure 1. The mean paths of snails in the E-W magnetic field (broken line), N-S magnetic field (solid line), and control snails solely in the earth's field (dotted line) as a function of hours of the lunar day. Standard errors of means at two selected times are depicted. turning, but the three samples exhibit a considerable similarity in the form of the mean cycle despite relatively wide differences between values for the three samples within individual series of 60 (See Brown, Brett, Bennett and Barnwell, 1960). Not only is the mean lunar-day cycle of turning of essentially the same ampli- tude as the comparable, previously described solar-day one, but displays a general similarity to it in gross form, though appearing to mirror-image the daily one in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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