DISTANCE IN THE SELECTION OF A PATH 



249 



then it is readily seen that P B , PI, and D can be evaluated from 

 the data given in the tables by the following, 



P. 



p, = Pt - p. 



D = P l - P. = 



l+R 



l+R 



(1) 



(2) 



(3) 



It should be remembered that in the case of maze A P t = 38.8 

 feet, and in case of maze B P t - 34.6 feet. 



Experiment 1. Maze A; rat 1. The results are presented in 

 table 1. 



TABLE 



In this experiment rat 1 shows preference for the shorter path 

 when the longer path is 11/100 longer than the shorter, and 

 adapts to a difference of 5/100 in one direction, but fails in the 

 other direction. 



Experiment 2. Maze A; rat 2. Table 2 gives the results. 



Rat 2 shows ability to select the shorter of two paths when 

 the longer exceeds the shorter by one-twentieth of its length. 



