WITH ONE FIGURE.I n a previous paper' the present writers advanced the conclusion that kinaesthetic and organic data play the fundamental r61e in the reactions of the white rat to the maze. This conclusion was reached by eliminating the other senses singly or in groups.It was not denied that the rat may occasionally use the data from these other senses o r t h a t it could use them if the occasion demanded. T h e present experiments attempt to supplement this conclusion. I n them, conditions were imposed upon the rat which would tend to bring the kinaesthetic factor into strong relief if, as assumed, it does possess fundamental importance in the determination of conduct within the maze. Two experiments were made: ( I ) After learning the maze, starting always from 0, the rats were placed in the positions2 marked x l , x2, x3, in the true pathway headed in either the right or the wrong direction and their method of obtaining orientation under these novel conditions was observed. T h e conclusion mentioned above was then theoretically discussed in the light of the new facts thus obtained, to see if difficulties and contradictions appear. (2) After the reactions to the maze became automatic, certain of the runways were either shortened or lengthened. T h e disturbing effect of these alterations upon the rats' conduct and their methods of learning to adjust themselves to the new conditions were observed. T h e two experiments will be discussed in order.
EXPERIMENT I. T H E EFFECT OF STARTING T H E RAT AT DIFFERENT POSITIONS.When the trained rat is put down in the maze at unfamiliar
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