142 



The Dancing Mouse 



eye the substitution of a color whose brightness was consider- 

 ably less than that of the orange, it seemed possible that the 

 mouse, if it had formed the habit of choosing the box which 

 seemed the darker, might by this change be misled into choos- 

 ing the red instead of the light blue. In a word, changes 

 in the conditions of the experiments were made in such a way 



TABLE 18 

 LIGHT BLUE-ORANGE 



Brightness check series Mouse No. 2, Series 13 



Feb. 8, 1906 



