VISUAL PERCEPTION OF THE CHICK 



TABLE 2— Continued 



41 



* Numbers in parentheses refer to series on record sheet, 

 t i\.verage time for series given in seconds. 



Finally the behavior of the chick indicated that it was discrim- 

 inating between ° 28+ and o 27 + (see record for November 

 23 and 24). 



The discrimination of such a minute difference was incredible, 

 for the human eye could scarcely detect a difference after the 

 variable reached o 23+. The next step was to try the chick 



