186 



D WIGHT E. MINNICH 



3. Experiments on Vanessa 



In the experiments on Vanessa the procedure differed slightly 

 from that used on Pyrameis. Instead of testing all animals 

 in all three positions in each set of trials, only those were tested 

 in position 2 which had failed to respond in position 1, and only 

 those in position 3 which had failed to respond in position 2. 

 The butterflies tested in position 3, therefore, were individuals 

 which had failed to respond in either position 1 or position 2. 



TABLE 3 



Vanessa 



^ Although the total number of specimens employed appears to be 27, it was 

 actually less, for a few animals were carried over from one experiment to another. 



The trials in each set were made in immediate succession, that is, 

 an animal failing to respond in position 1 was immediately tried 

 in position 2, and so on. A minimal interval of one hour, how- 

 ever, was allowed between any two sets of trials. Three experi- 

 ments were performed, the data therefrom being presented in 

 table 3 and figure 3. 



Of 203 trials in position 1, 113 gave no response; 90, response. 

 Corresponding to the 113 failures to respond in position 1, 113 

 trials were made in position 2. Of these, 110 again failed to 

 respond. The remaining three trials yielded responses, but only 

 one of them represented a complete extension of the proboscis. 



