REDINTEGRATION IN ALBINO RAT— A STUDY IN RETENTION 35 



length, fixed at one- end to a broad topped upright, 46 cm. 

 in height, from which the rat started; and at the other 

 end to a second upright of the same height as the first. 

 From the second upright, a ladder, 87 cm. in length and 

 8 cm. in width, with rope sides and wooden crosspieces, 

 extended upwards at an angle of approximately 45 degrees 

 to third upright 100 cm. in height, where food was placed 

 as the incentive. The pathway was approximately 190 cm. 

 in entire length. The learning of the rope ladder is of 

 little concern to us here. Suffice it to say that the integra- 

 tion of movements required in running the rope and ladder 

 in succession and maintaining equilibrium on them was 

 difficult to acquire. No single rat of the group under 

 consideration learned this problem perfectly in the 30-day 

 retention period allowed. 



At the end of the retention period the rats were not 

 given preliminary feeding in the center of the maze but 

 were put directly into the starting box of the maze and the 

 first trial of redintegration was made. Thus it is to be 

 noted that with this group the former norm and method 

 was followed with the single exception that the learning 

 of a new problem during the retention period took the 

 place of daily exercise. 



Tables VI-A and VI-B contain the complete records of 

 this group. In Table VI-A, the last 25 trials of learning 

 are compared with redintegration totals as is the case in 

 Table V-A. The compilation of Tables VI-B and V-B was 

 made in the same manner as the earlier tables of this 

 nature. Coming to a consideration of the results of the 

 present group. Table VI-A, compared with the records 

 of the norm group at 30 days' retention, contained in 

 Table V-A, it is evident that there is no increase in number 

 of " errors " in redintegration with the group learning a 

 new problem during retention, over that of the norm. 

 In fact the number of " errors " in redintegration in Table 

 VI-A is the lesser, relative to the learning total, while the 

 number of " errors " in redintegration in Table V-A is 

 the greater, relative to the learning total. In Tables V-B 

 and VI-B, it may be seen that the learning of the new 

 problem in the retention period has not interfered in point 



