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 success. SelcLom, if ever, is it the case that the organi- 

 zation of movements, which produce quick turns, and the 

 proper interaction of stimuli work simultaneously in 

 learning the maze. This is more usually the case when 

 the latch box is learned. Here movements are organized 

 and at the same time speed is acquired. Hot until the 

 interaction of stimuli which produce the right movements 

 act properly will the run in the maze be free from error. 



It is the dominance of the hunger stimulus which 

 evokes movements from position to position while learn- 

 ing is in progress. Some deny that this stimulus acts 

 in the early trials .however, the rats used in this exper- 

 iment were seldom, as Oarr (3) maintains in his work on 

 the square maze, "governed by caution and curiosity". 

 In every case scarcely had the rats made a turn into 

 the second path when they detected the odor of food 

 ere was immediately an eagerness to obtain it, 

 which was shown by inc activity of movements. 



