37 



respectively. Ihen comparing these tables in respect to 



number of trials, it again can be said that rats, 

 ' 3h had one trial daily, required fewer trials than 

 the rats given three or five trials. On the other hand, 

 when given several trials daily, the rats required fewer 

 days to learn the problems. This is an exact repetition 

 of results obtained when problems were given si 



The number of days and trials, that is, the total 

 time and days required by each individual rat to learn 

 the problems, are given on the distribution curves, 

 Plates 17, Y and VI. There is one feature noticeable on 

 these c it is not evident on previous distribution 

 curves. Individual differences in the number of days 

 and total time to learn the problems is more pronounced 

 when several trials are given than when one is offered. 

 Individual differences in ability to learn the problem 

 is less evident when one trial is given. In addition, 

 interesting compari. : ; b be made between Plates 



