DISTRIBUTION OF EFFORT IN LEARNING IN WHITE RAT 15 



beyond the point after the rapid descent in the curve was made. 

 At this particular point a few more trials were necessary with 

 one trial daily, and with one every other day still fewer were 

 required. It seems that the longer the interval between trials, 

 the simpler and more regular the curves become (within the 

 limits of this experiment). As on previous curves, a small 

 circular dot indicates the point where the first rat completed 

 learning. 



The following table. Table III, gives a summary of the trials 

 and days found necessary to learn the latch box in the different 

 experiments with this apparatus. 



TABLE III 



Giving the Number of Trials and Days Necessary to Learn the 



Latch Box 



RESULTS WITH THE CIRCULAR MAZE 



The next problem to consider is the maze. Fig. II. Though 

 it was the last one taken up, it is convenient to treat it at this 

 point, for it was the only other problem tried alone. This maze 

 differs in some respects from other types in common use — the 

 paths were circular. These were 10 cm. wide, partitioned off 

 by vertical sheets of aluminum 12 cm. high set in grooves of 

 a circular base 155 cm. in diameter. The center was about 

 20 cm. in diameter. The entrance from one path to the other 

 and to the center were in alternate quadrants of an arc. Wire 

 netting in two semi-circular sections covered the paths, and an 

 additional circular piece covered the center. The distance from 

 the entrance to the center of the maze when following a direct 

 path was approximately 375 cm. 



