180 



H. M. JOHNSON 



TABLE 2— Continued 



Remarks 



Taken as threshold 



Taken as threshold 



If the reader will now examine the daily records of Chick 2 

 and Monkey 2, shown in tables 1 and 2 respectively, he may 

 observe that the chick was usually disturbed when he was re- 

 quired to avoid a field which he had recently been in the habit 

 of choosing. The records for 21 to 24 March, 1914, exhibit 

 this fact strikingly. Monkey 2 tended to respond in this way 

 in the earlier stages of the work, but later overcame the ten- 

 dency. On December 8, 1914, I made a control test which 

 tends to make the fact clear. In the week immediately pre- 



