42 THOMAS WILLIAM BROCKBANK 



disturbances, and innate constitution may have had some 

 influence in the retention, but as already stated there are 

 no means at hand to prove their influence in the present 

 case. 



The redintegration records of rats 1 and 4 could almost 

 be taken as a direct continuation of the learning, were it 

 not known that retention had intervened; redintegration 

 was practically perfect for both these rats but the norm 

 in both cases had not been reached. The redintegration 

 of rat 3 is rather difficult to explain when compared with 

 the learning. It appears that the habit had been fairly 

 well established, excepting the " error " in the next to 

 the last trial; and thus it seems that the evidence in this 

 case, more so than in any other yet treated, points to poor 

 retention on the part of the organism. 



In litter 2 (Table VII-B), the final records of learning in 

 rats 9 and 10 show that the integrations had been more or 

 less firmly established by both rats at the completion of 

 the norm. In the first two trials of redintegration the 

 records of both rats, in integration of movement as well 

 as speed, are equal if not superior to their records in the 

 last few trials of learning. Rat 10 continued the perfect 

 exercise of the habit throughout redintegration, but rat 

 9 in trial three of redintegration exhibited in alley 2 im- 

 perfect integration, due to an extraneous disturbance. 

 Had it not been for this disturbance, it seems most likely 

 that rat 9 would have had a perfect redintegration, as 

 is credited to rat 10. Rats 9 and 10 both had the habit 

 firmly established at the beginning of retention. Rats 

 6, 7, and 8, as those of a similar status in litter 1, had not 

 firmly established integration, but retained the habit so 

 that it was exercised as well after 30 days' retention as 

 when learning ceased. This was likewise found true of 

 rats 1 and 4 in litter 1, and to a somewhat less degree in 

 rat 3. 



It may be concluded from this experiment that in most 

 cases, and under ordinary circumstances, the better estab- 

 lished is integration in the organism when the learning 

 ceases and the retention period begins the better will be 

 the redintegration. 



