138 



The Dancing Mouse 



TABLE 15 

 ORANGE-BLUE TESTS, WITH FOOD-BOX 



In preliminary tests, at the rate of four per day, the colored 

 cardboards were placed only at the entrances to the boxes, not 

 inside, and as was true also in the case of brightness tests 

 under like conditions, no evidence of discrimination was 

 obtained from ten days' training. This seemed to indicate 

 that a considerable area of the colored surface should be 

 exposed to the mouse's view, if discrimination were to be 

 made reasonably easy. 



This conclusion was supported by the results of other 

 preliminary experiments in which rectangular pieces of colored 



