. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 86 WILLIAM L. DOLLEY, JR., AND JOHN D. WHITE the five illuminances: 250, 600, 800, 1200, and 1600 f. c. Only one observation was made on each fly. All experiments were performed in a dark room. Before each experiment a record was made of the relative humidity of the air in the room. The same lamp was used in all of the experiments in all of the illuminances tested except those in 1200 f. c. The lamp used at this illuminance was, however, identical with the other one, so far as could be determined. A typical experiment was ma
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 86 WILLIAM L. DOLLEY, JR., AND JOHN D. WHITE the five illuminances: 250, 600, 800, 1200, and 1600 f. c. Only one observation was made on each fly. All experiments were performed in a dark room. Before each experiment a record was made of the relative humidity of the air in the room. The same lamp was used in all of the experiments in all of the illuminances tested except those in 1200 f. c. The lamp used at this illuminance was, however, identical with the other one, so far as could be determined. A typical experiment was made as follows. The 1600- 1400^ 1200 <d o 1000 J e 800 I 600 400 200 Males. 40 41 Temperature 42 43 44 45 degrees C. FIGURE 2. Graph showing the effect of illuminance upon the temperature at which re- versal in reaction to light in Eristalis occurs. Note that the mean temperatures of the re- versals decrease to a minimum at 800 f. c. In the males this decrease is followed by an in- crease, while in the females it is not. See text and Table I. glass dish, r (Fig. 1), was filled with distilled water and the illuminating unit, q, r, was so adjusted that the illuminance desired was obtained on the floor, f, of the light compartment, A. The temperature in the dark compartment, B, was raised to be- tween 35° and 37° C., that in the light compartment to 28° C. Throughout the experiment the temperature in the dark compartment was 6 to 9 degrees higher than that in the light compartment. Approximately 20 flies of the same sex, and with undipped wings, were placed in the light compartment by sliding back the glass plates, b, c. These plates were replaced; the heating unit under the light chamber. 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 L
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