54 



WALTER S. HUNTER AND JOS. U. YARBROUGH 



Relearning 



Total trials on relearning 



210 40 90 



50 160 270 60 



50 40 60 40 



40 40 60 



40 50 270 130 



On the day following the close of the 30-day period each rat 

 was retested on handclaps to the right. The results are in- 

 cluded in table 3. Our criterion of the degree of retention has 

 been the length of the period of relearning rather than the per 

 cent of correct reactions on the first day. Table 4 shows that 

 in the present case there is no way of predicting the amount of 

 relearning from the percentages made on the first days. It will 

 be seen from table 3 that all sets of rats are essentially on a par 

 with respect to retention. In other words, so far as these rats 

 are concerned, 30 days of diverse training has not produced effects 

 in retention. 



TABLE 4 



F stands for number of trials correct in first 10 of relearning. 

 T is the total relearning time in trials. 



B 



D 



E 



Rat F T Rat F 



Rat F T Rat F 



Rat F 



7 

 15 

 23 



5 90 

 3 210 

 8 40 



1 5 60 



11 10 50 



17 7 270 



18 2 160 



10 8 40 



14 10 40 



16 8 50 



20 8 40 



9 

 19 

 21 



7 40 

 9 40 

 9 60 



4 9 40 



8 7 270 



22 2 130 



24 7 50 



IV 



Sixty-day Rats. — Four rats (Nos. 1, 11, 17, 18) had- been 

 tested in the work outlined above. During the 30-day period 

 an effort was made to train them to turn right for the tuning 

 fork 256 d. v. without success. These rats were then idle, al- 



