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IThe term forced movements is borrowed from brain physiology, where it designates the fact that certain ani- mals are no longer able to move in a straight line whenWe are speaking of positively heliotropic animals exposed to only one source of light.Although the tropism theory of animal conduct was offered thirty years ago 285 286 > 287 its acceptance was delayed by various circumstances.In the first place, the majority of the older generation of biologists did not realize that not only the methods of the physicist are needed but also the physicist's general viewpoint con- cerning the nature of scientific explanation.In many cases the problem of animal conduct is treated in a way INDEX /Eschna, 30 Aglaophenia, 138 Allen, 39
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