The Journal of experimental zoology . ion are represented in figure 2. Anormal insect is also included for the sake of comparison. The tests on the above mutants have all been made ac-cording to the plan already outlined in one of the experimentsfor testing the effect of the removal of wings on light and gravity(p. 69). In brief, three tests were made for fight, alternatingwith three tests for gravity, with the tube in the vertical posi-tion only. No agitation was used during any of these one new point needs to be mentioned and that is in regardto an improvement in the apparatus. Un
The Journal of experimental zoology . ion are represented in figure 2. Anormal insect is also included for the sake of comparison. The tests on the above mutants have all been made ac-cording to the plan already outlined in one of the experimentsfor testing the effect of the removal of wings on light and gravity(p. 69). In brief, three tests were made for fight, alternatingwith three tests for gravity, with the tube in the vertical posi-tion only. No agitation was used during any of these one new point needs to be mentioned and that is in regardto an improvement in the apparatus. Under the former systemof testing for geotropism the lamp whose rays struck the tube at REACTIONS TO LIGHT AND GRAVITY IN DROSOPHILA 79 right angles was nevertheless near its foot. It was recognizedthat this method was unreliable when we attempted to comparethe gravity reaction of flies which were phototropic with thatof those which were not. Thus, two sets of flies, one photo-tropic and the other not, but possessing an equal amount of.
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
