. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GEOTROPISM OF THE MARINE SNAIL, LITTORINA LITTOREA. 59 possibly to fatigue. The same individuals could be used only for four or five trials. Ten individuals, sometimes II or 12 (with anticipation of falls), were used for each trial of a series of experiments. As will be seen in the tables, however, very often less than 10 individuals were left on the support for observation, the rest having fallen down. 2. Methods.—Loeb's method (8) modified by Davenport and Perkins (2) and by Frandsen (3), of the different angles of in- cli
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GEOTROPISM OF THE MARINE SNAIL, LITTORINA LITTOREA. 59 possibly to fatigue. The same individuals could be used only for four or five trials. Ten individuals, sometimes II or 12 (with anticipation of falls), were used for each trial of a series of experiments. As will be seen in the tables, however, very often less than 10 individuals were left on the support for observation, the rest having fallen down. 2. Methods.—Loeb's method (8) modified by Davenport and Perkins (2) and by Frandsen (3), of the different angles of in- clination of a support, on which the animals are to be placed, was adopted with variations. The support was a plain glass plate about 22 x 19 cm., marked off on one side into squares of one sq. cm. each, whereby it could be readily determined how far the animals moved from their original places. The support, or plate, was placed in an apparatus by which it could be held at any ten-degree angle between the horizontal and vertical (see Fig. i).. FIG. i. G. P. = a plain glass plate. The rest of the apparatus is all wood. The animals were placed on the unlined side of the plate, moistened and held upside down at an inclination, say 10° to. 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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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
