. Contributions. Biology. The Reactions of Planarians to Light 65 in the hood of the apparatus already described in Fig. i, the minghng of their rays being prevented by the insertion of a ver- tical diaphragm (Fig. 3, C), which extended from the region betw^een the hghts dow^n to the surface of the aquarium. In order to place the diaphragm in position it was, of course, necessary to remove the heat screen (Fig. i, C), the presence or absence of which, however, would not have affected the results sought since the water in the aquarium itself was nearly 2 cm. deep and thus. Fig. 3 A, stationary
. Contributions. Biology. The Reactions of Planarians to Light 65 in the hood of the apparatus already described in Fig. i, the minghng of their rays being prevented by the insertion of a ver- tical diaphragm (Fig. 3, C), which extended from the region betw^een the hghts dow^n to the surface of the aquarium. In order to place the diaphragm in position it was, of course, necessary to remove the heat screen (Fig. i, C), the presence or absence of which, however, would not have affected the results sought since the water in the aquarium itself was nearly 2 cm. deep and thus. Fig. 3 A, stationary light; B, sheet iron walls of hood; C, vertical diaphragm separating the two lights; D, horizontal diaphragm; E, sheet iron roof of hood; F, plate glass aquarium floor; G, parafEne wall of aquarium; HH, diaphragm to shut off reflections from wall of aquarium; I, wall of reflector box; J, open side of box; Z, mirror; L, black tunnel; A/, black draperies cutting off side light; A', table sup- porting reflector box and end of tunnel; 0, movable light; P, track for movable light; ^, narrow, hori- zontal diaphragm attached at right angles to the lower side of the diaphragm C, in order to prevent the light rays from the two sources of light, A and O,from overlapping. constituted an efficient heat screen. By keeping the hood sta- tionary and causing one of the lights (Fig. 3, 0) to slide up and down at will, it was possible to bring about various contrasts of. 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 Brown University. Biological Laboratory. Providence, R. I
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectbiology
