EXPERIMENTS ON THE RABBIT 171 



F. Expo intents on Polly (female) 



Series 32. Red and Hering grey number 7. Red opens. 

 These experiments were made in the yard attached to the hutch, 

 under the same conditions as the experiments "with Light Nose, 

 that is, the rabbit was admitted to the yard from the hutch for 

 each test, and driven back into the hutch between tests. She 

 learned to run back of her own accord after a test. If any 

 disturbing factor was involved, in the experiments carried on 

 indoors, by the fact that the rabbits were dropped in front of 

 the experiment box, it was absent here and in the work with 

 Light Nose, for these rabbits were usually not touched between 

 tests. The series contained 260 experiments. The daily percent- 

 ages were as follows: 60, 55, 50, 70, 50, 61, 56, 65, 50, 95, 60, 

 60, 70, 100, 90, 8o, 70, 80, 60, 100, 90, 80, 100, 80, go. 



The series lasted from October 3 to October 29, 191 1. 



Series 33. Red and Hering grey number 7, with interpolated 

 red and velvet black tests. We wished to see whether this 

 rabbit would confirm- the results of Dark Nose in showing a 

 preference for velvet black over red, or those of Abednego in 

 showing no preference between the two. The red door was open 

 and the black door closed in the interpolated tests. Six red and 

 grey tests were given, on an experiment day, in succession; 

 then four red and velvet black tests alternating with red and 

 grey tests. In the 40 red and grey tests the grey was chosen 

 only once. In the t6 interpolated red and velvet black tests 

 the red was chosen o times and the black 7 times. There was 

 thus no confirmation of the results obtained from Dark Nose. 

 This series lasted from October 30 to November 2. 



Sciies 34. Red and Hering grey number 15. Red opens. 

 There were 50 experiments in the series, made at the rate of ten 

 a day. The daily percentages were 60, 80, 80, 100, 100. The 

 series lasted from November 3 to November 8. 



Series ^. Hering grey number 15 and white. Grey opens. 

 This series comprised ten experiments only ; it was interpolated 

 to see whether the rabbit could follow the habit of choosing the 

 darker impression when the absolute brightness of the two 

 impressions was altered. The red was presumably darker than 

 grey number 15, and the rabbit had learned not to push this 

 grey when shown with red. Would she push the same grey 

 when it was shown with white, thus appearing as the darker of 



