TESTS OF LEARNING ABILITY 



marked in the diagram 1, 2, 3, 4. Three of these gates are blue and 

 one is red. 5 Punishment was given at the blue gates, but not at the 

 red. The gates are the same size as those used in the maze test just 



5 The Milton Bradly papers, red and blue were used, and, in so far as the 

 experiment was not designed to test the color sense of the animals, the brightness 

 value of the colors was not determined. The papers were changed from time to 

 time, but the odor factors were not eliminated. These clews, if they existed as 

 such, for the animals, were purposely retained, and the mice were allowed to 

 make use of them in solving their problems. 



