On the Interpretation of Certain Tropisms of Insects
On the Interpretation of Certain Tropisms of Insects
Charles Thomas Brues
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Wifli many species this may often con- tinue until the death of the insect from exhaustion and lack of food. •American Naturalist, vol. 39, pp. 157-171, 1905. Digitized by Google Xo.497] TROPISMS OF INSECTS 2d9 Such are the results of experimentation where the trans- parent sheet of glass has been allowed to change the nor- mal conditions of environment. Let us suppose, however^ that the fly be allowed to pass out of the window into a more nearly natural environment. It immediately flies into t...he open, but does not endeavor for any length of time to continue its positively phototropic movements. Once unrestrained it is soon again following the normal pursuits of its particular species, which in the case of the aforementioned Drosophila is principally to locate decay- ing vegetable matter which will be suitable for food, breeding, and oviposition. It is evident in this case that the universal and quick response of the Drosophila to- light when confined is due to some added factor in the experiment which I hope to point out on a later page.
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