160 M. 1'. WASHBURN AND EDWINA ABBOTT 



much darker grey for those previously used, is strong evidence 

 that the rabbits were depending on a visual clue. The series 

 lasted from February 13 to February 20. 



Scries 5. Red and Hering grey number 7. Red opens. The 

 obiect of making this series of experiments with the same grey 

 used in Series 2 was to find whether the failure of Light Nose 

 with the red and Stoelting black was due to the difficulty of the 

 discrimination or to some other cause, such as the separation 

 of the rabbits or their physical state. The conditions were as 

 before. Light Nose had by this time, however, become very 

 indifferent to the experiment box. On being admitted to the 

 yard he would commonly sit down and begin a prolonged toilet, 

 at the end of which he would perhaps stroll about the box. 

 When he pushed a door it seemed more the result of a chance 

 impulse than of one based on discrimination. The total number 

 of tests was 26; his total percentage of correct choices was 65. No 

 place tendency appeared. On the whole, despite the unsat- 

 isfactory character of his behavior, some explanation other than 

 in lifference seems required to explain the results of Series 4. 

 Series 5 lasted from February 21 to March 1. 



Series 6. Red and Hering grey number 15. The conditions 

 were as before. The total number of experiments was 29, and the 

 total percentage of correct choices was 70. These were the last 

 experiments made with this rabbit, as the work with him con- 

 sumed too much time. The series lasted from March 2 to 

 March 11. 



It will be seen that his percentage of right choices was above 

 50 in every case except the series w T here the Stoelting black 

 paper was used. 



B. Experiments with Dark Nose (female) 



Series 7. Red and Hering grey number 15. Red opens. This 

 series was made with the conditions as described under Series 1, 

 and during the same period. The total number of experiments 

 was 71, and the total percentage of correct choices made by Dark 

 Nose was 70. Calculated at intervals of three days, that is, for 

 every tw r elve tests, her percentages were 55, 60, 85, 61, 78, 60. 



Series 8. Red and Hering grey number 7. Red opens. Con- 

 ditions and time as in Series 2. The total number of experiments 



