The above analysis requires the following explanation: 



The upper one of the two horizontal rows of figures that are 

 opposite each trial number indicates the number of times that 

 each of the four alleys was entered dttring all preceding trials. 

 For example, opposite trial No. 1 are the figures 1, 4, 5 and 5. 

 They are meant to show that White Rat 5 had entered alley No. 

 1 once, alley No. 2 four times, alley No. 3 five times and alley 

 No. 4 five times when she began her first formal trial, i.e., she 

 had made these alley entrances during her preliminary trials. 

 During her first formal trial she entered alley No. 1 once, alley 

 No. 2 once, alley No. 3 twice and alley No. 4 three times. 

 These figures appear in the second horizontal row opposite 

 trial No. 1, and are appropriately distributed under the figures 

 1, 2, 3 and 4, which have the legend, "Alleys" for their heading. 

 The two sets of figures opposite trial No. 1 and under the head- 

 ing "Alleys" are added to give the uppermost horizontal row 

 of figures opposite trial No. 2, and these sums show the number 

 of times that each of the four alleys had been entered in all 

 trials previous to formal trial No. 2. 



The figures under the heading, "Alley first entered" indicate 

 the subject's first choice of alley to enter during each of the 

 100 formal trials. The figures under the heading, " Right 

 Alley " indicate the alley that actually afforded escape during 

 each trial. The heading, " Relation of first choice to previous 



