Cole, hitelhgence of Raccoons. 227 



as before and their positions from right to left were reversed. 

 This reversal was made in each successive trial at first, then the 

 feeding glass was left in the same place twice in succession, then 

 three times, so that neither position nor illumination should influ- 

 ence the choice. The usual distance between the two glasses 

 was six or eight inches, for beyond this distance the animal 

 seemed to get his eyes fixed on one of the glasses and to go straight 

 to that one. His reaction was influenced by the direction of his 

 gaze at the moment he was set free. This seems unusual, yet it 

 appeared regularly whenever the glasses were placed from twelve to 

 thirty inches apart. The distance from the point at which the rac- 

 coon was set free to the glasses was eight feet. 



No. 4 and No. i were tried with black and white. Food was 

 always placed in the black glass. No. 4 was given 25 trials the 

 firsr day, 68 the second and 50 the third; No. i was given 25 

 trials first day and 100 the second. Thus both were practically 

 perfect toward the close of the second day's test. 



After five days without practice No. 4 in fifty trials went directly 

 to the black forty-five times. On the third, seventh, tenth, four- 

 teenth, twentieth and twenty-second trials she went to the white. 



Two days later No. i was perfect in fifty trials, and after an 

 interval of five days in 46 out of 50. The animals, therefore, 

 learn to discriminate black from white in from seventy to ninety 

 trials. 



No. 2 and No. 3 were tried with red and green glasses. Food 

 was placed in the latter. No 2 was given approximately 120 



