NEW WOEK ON ANIMAL PSYCHOLOGY. 



The Play of Animals: 



A Study of Animal Life and Instinct. 



By KARL GROGS, 



Professor of Philosophy in the University of Basel. 

 TRANSLATED WITH THE AUTHOE's CO-OPERATION BY 



ELIZABETH L. BALDWIN. 



WITH A PBEFAOE AND AN APPENDIX ON ORGANIC SELECTION 



By J. MARK BALDWIN, Pbofbssor in Princeton Academy. 

 Crown ?>vo, 10s. 6c?. 



CONTENTS. 



The Surplus Theory of 

 Play. 



Play and Instinct. 



The Play of Animals. 



expeeimentation. 



Movement Plays. 



Hunting Plays : With Eeal 

 Living Prey, Living Mock 

 Peey, and Lifeless Mock 

 Prey. 



Fighting Plays ; Teasing, 

 Tussling among Young 

 Animals, Playful Fight- 

 ing between Adult Ani- 

 mals. 



, Consteuctive Aets. 

 NuEsiNG Plays. 

 Imitative Play, 

 cueiosity. 



Love Plays among Young 

 Animals. 



COUETSHIP by the MeANS OF 



THE Aets ' of Movement 

 and of the display of 

 Unusual oe Beautiful 

 Forms oe Coloues ; and 

 OF Noises and Tones. 



COQUETEY IN the FeMALE. 



The Psychology of Animal 

 Play. 



