http://worldcat.org/entity/work/id/17649312

Contributions to the study of the behaviour of lower organisms

Then progressing straight forward, it of course moves away from the source of stimulus (negative taxis or tropism). If the motor organs on the side most affected are caused to contract less strongly than those on the opposite side the organism is necessarily turned with anterior end toward the source of stimulus; then its usual forward movements take it toward the source of stimulus (positive taxis or tropism). Loeb lays especial stress on the direction from which the stimulus comes, as it is this that determines which side shall be most strongly affected by the stimulus; otherwise the theory as he sets it forth is essentially like that held by Verworn. Both these authors apply this schema to the movements of organisms to and from many sorts of stimuli, making it a general formula for taxis or tropisms. In the present series of papers the writer proposes to examine the behavior of a number of lower organisms, in order to determine whether the reactions to the usual stimuli take place in accordance with this tropism schema or not, and if not, to determine the real nature of the reaction method"--Book. (PsycINFO Database Record (c) 2010 APA, all rights reserved).

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