164 M. F. WASHBURN AND EDWINA ABBOTT 



unlikely by these results is that in the preceding experiments 

 with red and grey she had been avoiding grey as such rather 

 than choosing red, for continuing to avoid the grey would have 

 produced a perfect record in this series. The series lasted from 

 March 18 to March 24. 



Series 15. Blue and Hering grey number 15. Blue opens. 

 The experiments of this series were made at the rate of eight a 

 day. There were 56 in all, and the total percentage of right choices 

 was exactly 50. The percentages for each day were 62, 62, 50, 50, 

 25, 37, 62. Here again the interpretation is doubtful. If the 

 blue were seen as a color, one would have supposed that some 

 signs of an association between it and food should have begun 

 to make their appearance by this time. If on the other hand 

 the habit of choosing the darker impression as such had been 

 formed, and grey number 7 had looked darker than the blue, 

 then even more difficulty should have been experienced in 

 learning to choose blue rather than grey number 15, which is 

 darker than grey number 7, This increased difficulty seems 

 actually to have been felt, judging from the results. The series 

 lasted from March 24 to April 5. 



Series 16. Red and grey number 7. Red opens. This series 

 was given merely to re-establish the old red and grey habit in 

 order that it might serve as a basis for some interpolated blue 

 and grey tests. Eight experiments were given a day for five 

 succeeding days: the percentages were 87, 62, 75, 87, 87, 100. 

 The series lasted from April 5 to April 10. 



Series 17. Red and grey number 7, with interpolated blue 

 and grey 15 tests. If the grey 15 looked darker. than the blue, 

 and the rabbit were capable of forming a habit of reacting to the 

 darker impression in general, then tests where grey 15 and blue 

 were used, interpolated in series where the rabbit was choosing 

 red rather than grey 7 , should produce a preponderance of choices 

 of the grey. On each day eight tests with red and grey 7 were 

 given, then a test with blue and grey 15, then a red and grey 7 

 test, and then a final blue and grey 15 test. In all the 63 red 

 and grey 7 experiments the rabbit went at once to the red. There 

 were altogether 14 of the interpolated blue and grey 15 tests. 

 In these the rabbit touched the grey first 11 times. She did 

 not touch the blue first in any of the six tests made on the first 

 three days. The most obvious explanation of this result is that 



