60 



HAROLD C. BINGHAM 



of form perception was begun with group 3, therefore, the 

 method of the prehminary visual complex was adopted. That 

 is, form, in the beginning, was made only one of other visual 

 factors which were gradually eliminated as the experiment pro- 

 gressed. Only one chick, No. 21, gave anything like positive 

 results. The work with this chick, including considerable train- 



No. 



TABLE 6 



Form Perception: O 28-1 A 28-f- 



9. Hatched: December 1, 1911. Sex: 



ing in size and brightness vision, represents more than 1500 

 tests. 



The experiment on form discrimination with chick 21 may be 

 divided into three parts: (1) A preliminary investigation; (2) 

 reactions to the triangle-circle; and (3) reactions to the circle- 

 triangle. The method of the visual complex and the general 

 improvement of my technique enabled me to get much more 



