The Journal of experimental zoology . Fig. 2. A, Normal insect. B, Specimen of curled stock. C, Specimen of vestigialstock. D, Specimen of strap stock. 80 ROBERT STANLEY McEWEN negative geotropism would show the latter more negativelygeotropic than the former. This would result from the factthat though equally impelled to move upward, the phototropicanimals would be constantly handicapped by the attraction ofthe light from below. In order to remedy this difficulty, there-fore, three lamps of the same candle power were arranged in avertical line, so that one came opposite the foot of the tube,
The Journal of experimental zoology . Fig. 2. A, Normal insect. B, Specimen of curled stock. C, Specimen of vestigialstock. D, Specimen of strap stock. 80 ROBERT STANLEY McEWEN negative geotropism would show the latter more negativelygeotropic than the former. This would result from the factthat though equally impelled to move upward, the phototropicanimals would be constantly handicapped by the attraction ofthe light from below. In order to remedy this difficulty, there-fore, three lamps of the same candle power were arranged in avertical line, so that one came opposite the foot of the tube, oneopposite the center, and one opposite the top. The end of eachbulb was a distance of 41 cm. from the tube. The latter, more-over, was now held in its vertical position by a wire support, sothat there was no danger of its wabbling. With these improve-ments, the following experiments were undertaken. In the first place, it was decided to run a test on some wildflies in order to get some data which should be comparable withthat obtai
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
