64 



HAROLD C. BINGHAM 



in series 10 recorded in table 8 under date of March 28 where 

 the record is the same and the behavior was very similar. 



Finally this chick's response to the circle-triangle was tested. 

 The reversion of the condition for discrimination was at first 

 confusing to the chick, and much patience on the part of the 



TABLE 8 



Form perception: A 28H o 28+ 



No. 21, Hatched: February 9, 1912. Sex: 9 



iJn series 15 the triangle was inverted during tests 5-7; the result was 2 wrong choices 

 with an average time of 39 seconds. 



experimenter was necessary. The plan now was to begin with 



o63H A 28+ and gradually to eliminate the size difference 



by substituting successively smaller circles. In this case the 

 correct stimulus area was the variable and the standard was the 

 sign of "shock" and "no escape." From the summary of these 



