CONTENTS 



PREFACE xi 



CHAPTER I 

 THE ANIMAL COMMUNITY 1 



CHAPTER II 

 ANIMAL HABITATS 15 



CHAPTER III 

 COMMUNITY ANALYSIS 30 



CHAPTER IV 



THE ORGANIZATION OF LAND COMMUNITIES 48 



CHAPTER V 



THE EVOLUTION OF ANIMAL COMMUNITIES 65 



CHAPTER VI 

 UNBALANCE m NATURE 85 



CHAPTER VII 



AGGREGATIONS OF ANIMALS 99 



CHAPTER VIII 



PHYSIOLOGICAL EFFECTS PRODUCED BY AGGREGATIONS 116 



CHAPTER IX 



STRUCTURAL EFFECTS PRODUCED BY AGGREGATIONS 135 



CHAPTER X 



THE HIGHER SOCIAL LEVELS. . , . 145 



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