. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DIURNAL AND TIDAL RHYTHM INTERACTIONS 587 case seem not show any systematic variation in rate of progression but rather to progress consistently at a rate greater than that of the tides. The period calculated from the slope of the line drawn through the points is about hours. The data for animals exposed to a cycle by supplemental light periods of two hours duration are seen in Figure 5. There was less consistency between samples here than for any of the previous experiments. In a few cases the average rate o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DIURNAL AND TIDAL RHYTHM INTERACTIONS 587 case seem not show any systematic variation in rate of progression but rather to progress consistently at a rate greater than that of the tides. The period calculated from the slope of the line drawn through the points is about hours. The data for animals exposed to a cycle by supplemental light periods of two hours duration are seen in Figure 5. There was less consistency between samples here than for any of the previous experiments. In a few cases the average rate of progression of peaks over a period of 10 or more days was greater 24 20 16 < u LL L_ O O O. 8 12 16 TIME OF LOW TIDE 20 24 FIGURE 5. Time of activity peaks in relation to low tide for animals exposed during recording to cycle of hours by two-hour supplemental light. than the rate of tidal progression; in most cases the peaks occur within the six-hour period preceding low tide but with no clear pattern within that period. In Figure 6 are presented mean diurnal curves for those experiments for which two successive 15-day periods of data were available. Figure 6B shows the mean curve for animals pretreated by exposure to light from 6 AM to 6 PM for 5 days; ordinate values are per cent of hour active, along the abscissa are plotted hours of the solar day. Figure 6C presents comparable data for animals pretreated by exposure to light from 10 PM to 10 AM ; Figure 6D, the data for animals exposed. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biologi
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