. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 356 J. E. G. RAYMONT The results of experiments with (a) two upper eyes only functional and (b) two lower eyes only functional were similar. The beetles were always positively phototropic when they were light-adapted. They were usually still positively phototropic after dark adaptation of less than two hours duration, but became negatively phototropic after dark adap- 8 8. FIG. 1. Tracings of paths followed by Dinentes (Individual X) May 19, 1938, in 8 successive trials after dark adaptation for seven hours. The upper eyes w
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 356 J. E. G. RAYMONT The results of experiments with (a) two upper eyes only functional and (b) two lower eyes only functional were similar. The beetles were always positively phototropic when they were light-adapted. They were usually still positively phototropic after dark adaptation of less than two hours duration, but became negatively phototropic after dark adap- 8 8. FIG. 1. Tracings of paths followed by Dinentes (Individual X) May 19, 1938, in 8 successive trials after dark adaptation for seven hours. The upper eyes were functional. The numbers refer to the order of trials. L. indicates light source. tation of more than two hours duration. However, the actual period of dark adaptation necessary to bring about the change in phototropic sign showed considerable individual variation; in a very few cases, even one hour was sufficient. A beetle which had been dark-adapted for a period sufficient to be-. 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 Biological Laboratory
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