500 



KARL T. WAUGH 



Lights at S.'i cm. and 54 cm. 



Li {I his at 34 cm. and 40 cm. 



CHOICES 

 1ST DAY 



2nd 3rd 



Conclusions : The mouse discriminates between differences in 

 the brightness of white light; the less the objective difference, the 

 greater the difficulty in discrimination. 



The discrimination of the albino mouse is slightly inferior to 

 t hat of the mouse with black eyes. 



PROBLEM 2. COLOR DISCRIMINATION 



A. Under indirect illumination 



Experiment (a). Discrimination of colored objects. 



Apparatus and Method : The apparatus used in this experi- 

 ment was the same as that already described under problem 1, A, 

 (a) and (b) (see p. 550). The colors chosen were an orange-red 

 and a blue (Bradley papers). These were judged to be of equal 

 intensity by several members of the laboratory. The papers were 

 pasted on tin boxes and the experiment was conducted as in the 

 intensity-discrimination experiment. The following eleven mice 

 were used : 



