EFFECT OF LENGTH OF BLIND ALLEYS ON MAZE LEARNING 37 



to be following a scent of any kind moved perceptibly more 

 slowly, holding the nose continuously or frequently to the floor. 

 The writer does not believe that the more rapid elimination of 

 the cul de sacs nearer the food is to be explained on the basis 

 of scenting the food. The matter, however, needs further test. 



1-5 6-15 16-25 36-45 66-65 76-85 

 TRIAL PERIODS 



96-105 116-125 



Figures VIII and IX.— F and L show percentage elimination of all entrances to 

 cul de sacs 1-4 and 6-10 combined, respectively, by twenty-four rats in the 

 B-mazes; UF and UL the corresponding data for sixteen untrained rats. F 

 and L' show the percentage elimination, respectively, of all entrances to blind 

 alleys 2 and 3, and 5 and 6 combined, by twenty-two rats in the A-mazes. 



Do pure probability laws govern the returns of the rat on 

 emergence from blind alleys? In the tables of results (tables I 

 and II) the totals of the first two trials have been kept separate 

 so that the percentage of returns from blind alleys toward the 

 starting place in the maze could be found for a period little 



