114 CHARLES A. COBURN AND ROBERT M. YERKES 



next in order ;(3) to reenter the compartment first chosen and 

 then to choose the second from the left of the series; (4) to enter 

 a compartment at or near the right end of the series and on 

 emerging to turn to the right and enter the one directly in front, 

 and so on until the right compartment is entered. 



4. Since no one of these types of reaction is satisfactory, 

 the birds shifted from one to another, trying them for varying 

 periods. 



5 . The male was more tame, bold, and aggressive than the 

 female. Consequently, he made the better showing in the 

 experiments. 



The multiple choice method, with four standardized problems, 

 has been employed with pigs, rats, and ring-doves, as well as 

 with crows; and, among human subjects, with normal and 

 defective children and adults and with dementia praecox patients. 

 The results will appear in a series of papers of which this is 

 the first. 



