20 INDIVIDUAL DIFFERENCES AND FAMILY RESEMBLANCES 



firmatory evidence from the data, and it must be remembered that 

 the original test, although older than the interference test, still re- 

 ceived a greater amount of repetition. It appears from the results 

 of the experiment that the condition in 3 is most likely to account for 



TABLE VII 

 COMPLETE EECORDS OF THE UNRELATED INDIVIDUALS IN THE MAZE TEST 



the facts; that is, the transfer of capacity developed in the multiple 

 choice test accounted for the superiority of the retention test, by 

 virtue of the better adjustment that the animals received to the ex- 

 periment as a whole, and by practise in the elimination of fruitless 

 movements. The number of seconds required for the average mouse 

 to complete the first trial of the retention test is below all but one of 

 the records that the same mice made in the interference test, and it 

 is noteworthy that the curve for the retention test based on the daily 

 average, is not similar to either of the preceding curves, but is nearly 

 flat, except for a slight rise at the last trial. Since the average 

 animal did not start with a high time record, it is evident that it did 

 not need to learn the task all over again, but showed a considerable 

 amount of permanence of association for the previously learned task. 

 The curve for the retention test, based on the median record for 

 each day, confirms, in the main, what has already been said concern- 

 ing this test. The curve for the median is also flat, the four high 

 points all reaching to about a score of twenty seconds, and it again 

 shows the relative superiority in the record for the first day of the 

 test. Also, taken day by day, the records for the retention test, with 

 a single exception, show the retent ; on test with daily records su- 

 perior to the corresponding ones of the interference test. 



(d) RESULTS FOR MULTIPLE CHOICE TEST 



Fig. 5 gives complete record curves for the same 71 mice as tested 

 by the multiple choice, and the limits of the probable error, for the 

 curve based on the daily average, are indicated in the same manner 

 as explained for the previous curves. The average time for the first 

 trial in the maze test is 236 seconds as compared with 91 seconds as 



