250 



E. P. CHUM/HILL, JR. 



through the maze and the time noted the instant it touched the 

 food. The fish was allowed about five minutes in which to eat 

 the food and was then removed from the maze. 



Group I consisted of four fish which were used with the wire 

 partitions with no visual signs about the openings. The curve 

 representing the averages of the length of time of their trials 

 is shown in Fig. 2. Three of these fish were given 60 trials, 

 the fourth 46. In Fig. 2 the part of the curve enclosed in 

 parentheses represents the averages for three fish only. It will 

 be seen that the average time fell from 105 minutes for the 

 first trial to 3 or 4 for the last trials. After the thirty-sixth 

 trial the time never exceeded 5 minutes. The elevation at the 

 point marked "x" is partly due to the exceedingly poor record 

 of two individuals after the group had undergone a cessation 



no 



100 

 90 



80 



70 



60 



50 



40 



30 



20 



10 







60 



10 20 30 40 50 



Figure 2. Curve for Group I representing the average time of the daily trials. 

 The elevation at x was caused by the poor record of two fish after a cessation 

 of practice of two weeks. The portion enclosed in parentheses represents the 

 time for three fish only. The abscissae indicate trials, the ordinates, time 

 in minutes. 



of practice of two weeks duration. Individual variations were 

 quite noticeable. Fish No. 1 consumed 240 minutes during its 

 first trial, while No. 2 required only 17, but went as high as 80 



