The Journal of experimental zoology . lly of a white-walled, cylindricalchamber. This chamber was illun^inated by an incandescentlamp, the light of which was diffused through a thin, white screen,suspended a short distance below the lamp. Bees were admittedto the apparatus through a small, circular opening in the centerof the floor, and the course of their creeping was then traced asaccurately as possible on a record. The apparatus was espe-cially designed to afford a creeping animal a continuous photicstimulation of uniform intensity over the entire surface of theeye. A more detailed descript
The Journal of experimental zoology . lly of a white-walled, cylindricalchamber. This chamber was illun^inated by an incandescentlamp, the light of which was diffused through a thin, white screen,suspended a short distance below the lamp. Bees were admittedto the apparatus through a small, circular opening in the centerof the floor, and the course of their creeping was then traced asaccurately as possible on a record. The apparatus was espe-cially designed to afford a creeping animal a continuous photicstimulation of uniform intensity over the entire surface of theeye. A more detailed description is presented in the followingparagraphs (see figure 2). ^ Distances from lamps to creeping surfaces were measured from the center ofthe filament in all cases. PHOTIC REACTIONS OF HONEY-BEE 351 The cylindrical chamber, which measured approximately 84cm. in height by 87 cm. in diameter, was constructed on a lightwooden framework covered on the exterior with heavy, corru-gated cardboard. On the interior it was lined with a thickness. Fig. 1 Plan of directive light area, showing two trails of a normal bee. Notethe deflection of the courses in the non-directive region near the lamp and directlybeneath it. of dead white, cotton cloth, backed by a layer of heavy whitepaper. Oii one side of the cylinder, and extending from its bot-tom edge, a rectangular opening 58 cm. high by 32 cm. wide wascut through the cardboard and paper layers. The white clothlining only closed this opening, and it was here slit from top tobottom, the bottom edges being left free. The two flaps thus 352 DWIGHT E. MINNICH formed allowed free access to the interior of the cylinder. Inone_of them a small opening (fig. 2, o), 3 by 4 cm., was cut forpurposes of observation. The top of the cylinder was similar in construction to the sidewalls except that the cardboard layer was omitted. Near oppo-siteedges of the top, two circular openings, 8 cm. in diameter,
Size: 1573px × 1589px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1919
