CONTENTS. 



I. PRELIMINARY DEFINITIONS AND ILLUSTRATIONS ... ... 1 



II. SOME HABITS AND INSTINCTS OF YOUNG BIRDS 29 



III. LOCOMOTION IN YOUNG BIRDS ... ... ... ... 59 



IV. FURTHER OBSERVATIONS ON YOUNG BIRDS ... ... 80 



V. OBSERVATIONS ON YOUNG MAMMALS ... ... ... 101 



VI. THE RELATION OF CONSCIOUSNESS TO INSTINCTIVE BEHAVIOUR 126 



VII. INTELLIGENCE AND THE ACQUISITION OF HABITS ... ... 144 



VIII. IMITATION ... 166 



IX. THE EMOTIONS IN THEIR RELATION TO INSTINCT ... ... 186 



X. SOME HABITS AND INSTINCTS OF THE PAIRING SEASON ... 210 



XI. NEST-BUILDING, INCUBATION, AND MIGRATION ... ... 232 



XII. THE RELATION OF ORGANIC TO MENTAL EVOLUTION ... 262 



XIII. ARE ACQUIRED HABITS INHERITED? ... ... ... 280 



XIV. MODIFICATION AND VARIATION ... ... ... 307 



XV. HEREDITY IN MAN , 323 



FRONTISPIECE : GROUP OF YOUNG BIRDS, FROM A DRAWING BY 

 G. E. LODGE. 



