CONTENTS 



CHAPTER PAGE 



Editor's preface iii 



Author's preface xvii 



I. — The surplus theory of play 1 



II. — Play and instinct 25 



III. — The play of animals 82 



Experimentation 85 



Movement plays 99 



Hunting plays 120 



a. With real living prey 120 



b. With living mock prey 123 



c. With lifeless mock prey 130 



Fighting plays 135 



a. Teasing 136 



b. Tussling among young animals .... 139 



c. Playful fighting between adult animals . . 145 



Constructive arts 152 



Nursing plays 167 



Imitative play 178 



Curiosity 214 



XXV 



