CONTENTS Page 

 Acknowledgment iv 



Part I. Pitch-Discrimixatiox 



Historical 1-19 



Method of Pavloff 's school 1 



Goltz's ' ' Gehirnlos Hund " 3 



Munk's experiments 3 



Kalischer's earlier work 4 



Rothmann's experiments 13 



Kalischer's later work 15 



Swift's experiment 18 



Summary 19 



Preliminary experimentation 19-27 



Problem, animals and method 19 



Results 24 



Control experiment 27 



Conditions of reliable experimentation 30 



Further experiments on pitch-discrimination 41 



Experiments on discrimination between noises 46 



Summary 51 



Part II. Habit-Formatiox 



Problem 54 



Apparatus 54 



Animals 55 



Method of training 57 



Resuhs 59 



Operative proceeding 71 



Post-operative tests 71 



Retention 74 



Control tests 74 



Summary 78 



