60 L. W. SACKETT 



3 made i8 correct choices in the first series. In this, there is 

 a strong indication that brightness was the cue in the colored 

 boxes rather than the color itself. The porcupines did not 

 behave as if they were in the presence of a new problem but 

 rather in the presence of a slight variation of a familiar condi- 

 tion. Each of them was given a series with the dark blue and 

 the light green and both chose the blue box i8 times. Following 

 this a series was given with the light blue and the dark green 

 but this time the food was in the lighter box. It was assumed 

 that if they were reacting to color they would still have blue as 

 a stimulus but if they were reacting to brightness they would 

 have a new problem. No. lo made less than 50% in three series 

 and No. 3 got just what chance would give him. This was some- 

 what surprising for if they were not reacting to color they would 

 not be expected to do so well as that. Each of the animals, how- 

 ever, went to the dark box first and when they failed to find 

 food, looked toward the light one but refused to inspect it and 

 examine it for food. Instead, they each turned around and begged 

 from the experimenter. Failing in that, they returned to the 

 dark box again. No. 3 then looked into the light blue box 

 and obtained food but No. 10 appealed to the experimenter 

 again and again before he explored the light blue. This was 

 exactly the habits of the animals during earlier tests with grays 

 and colors on the few occasions when food was not inserted or 

 when it was placed into the wrong box by the experimenter. This 

 leads the writer to believe that they had used the same basis 

 of choice which they had formerly used in the gray tests. This 

 last succession of tests was repeated with both animals with 

 the same general results as shown in the tables, a third repeti- 

 tion with No. 3 brought even more decided results. 



TABLE XI 

 Porcupine No. 3. (Memory 105 Days) 



Black-White 15, 17, 20. 



Blue-Green food in blue 12, 15, 16, 14, 13. 



Black-White 20. 



Blue-Green food in blue 17, 17, 15, 20. 



B^-Gj Alt. G^-B, (dark) 17, 17, 19, 16, 17, 18, 20. 



Bo-G^ food in dark 16, 18, 18, 20. 



B^-G, food in liglit 7, 9, 9, 5, 5. 



B^-G^ food in blue 10, 13, 12, 17, 14, 12, 10. 



B,-G2 food in dark 20. 



B2-G2 food in dark blue 14, 16, 20. 



Blue-Green food in blue 16, 18, 20. 



