106 



HAROLD C. BINGHAM 



came discouraged at this point and the training had to be 

 repeated. 



In table 8 is presented the results of the re-training of No. 

 21. While the record, as shown in the table, is quite convincing 



TABLE 8 



Form Perception: a 28+ — 28+ 



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



1 In series 15 the triangle was inverted during tests 5-7; the result was 2 wrong 

 choices with an average time of 39 seconds. 



that the chick discriminated between the triangle and the 

 circle, it is, nevertheless, equally convincing that the chick 

 did not perceive the form difference. It had reacted properly 

 to the a 28+ — o 19+ and — o 23+ when the apex of the triangle 

 was at the top, but when the triangle was inverted (series 20, 



