THE LEARNING OF A MAZE BY GOLDFISH 



253 



frequently than in either of the previous groups. The record 

 of this group is better than that of Group I, but not as good as 

 that of Group II (Fig. 5). The chief difference was that their 

 improvement was not quite as rapid, their final attainment 

 being as great as that of Group II. Fig. 5 shows the three 

 curves plotted together, the trials being grouped in fives. The 

 openings in the wooden partitions were not as conspicuous from 



Figure 5. Curves for the three groups plotted together for purposes of com- 

 parison, the trials being grouped in fives. Continuous line represents Group 

 I, dotted line Group II, broken line Group III. The abscissae represent trials, 

 the ordinates, time in minutes. 



a distance, unless the fish were directly in front of them, as were 

 the black-banded openings. This may account for the fact that 

 the record of Group III was not as good as that of Group II. 

 Retention tests were tried with two fish. In Group I prac- 

 tice with one individual was allowed to cease for thirteen days 

 after the forty-sixth trial. The record for the last three trials 

 was 30 seconds each. After the interim the first trial required 

 7.5 minutes. The time dropped to one minute on the fifth 

 trial. One individual of Group II was given a retention test 



