HUMAN REACTIONS IN A MAZE 125 



plexity implied in such a term as " intelligence," and the intri- 

 cacy of the relations between " intelligence " and these numer- 

 ical factors can not be too strongly emphasized in view of the 

 tendency frequently manifested to rate animals in an intelligent 

 scale on the basis of experiments in learning. 



An experimental analysis of this complex situation consti- 

 tutes a problem for any psychology which professes as an ulti- 

 mate aim the ability to grade organisms in an intelligent scale 

 from objective results quantitatively stated. 



