100 HAROLD C. BINGHAM 



it responded negatively in both of the relative stimulus tests. 

 On the fourth day, four of the relative reaction tests were made, 

 of which three were correct. The final result for these special 

 tests was five correct and five wrong reactions. In the faster 

 relative combination, there were only two correct choices; in 

 the slower, there were three positive responses out of five. 

 In each of the first relative flicker tests the responses were 

 correct. 



The results of the tests on the relativity of the chick's choices 

 is thus different for each of three kinds of stimuli. With forms, 

 it was so difficult to train subjects that the results are rather 

 meager, but as far as they go they seem to be negative. With 

 sizes the results are fairly positive. With flicker perception, 

 again, the data are too meager to warrant a conclusion on the 

 relativity problem. In general, it seems that with certain 

 stimuli the chick can respond on the basis of relative stimulus 

 difference. 



