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TABLE OF CONTENTS 
. INTRODUCTION 
MAN AND ANIMALS 
I. Introduction . 
II. The Struggle in Neapares 
III. Man’s Relation to Nature . 
IV. The Economic Importance of atecrale 
THE ANIMAL ORGANISM AND Its ENVIRONMENTAL RELATIONS 
I. Nature of Living Substance 
II. The Relation of Form or Structure to ance) 
III. The Basis for the Organization of Ecology 
IV. Scope and Meaning of Ecology 
V. Communities and Biota 
Tue ANIMAL ENVIRONMENT: ITS GENERAL NATURE AND ITS 
CHARACTER IN THE AREA OF STUDY , 
I. Nature and Classification of Bavironents : : 
II. The Important Factors and Their Control in Nature 
III. History of the Region about Lake Michigan 
IV. Extent and Topography of the Area Considered 
V. Climate and Vegetation of the Area 
VI. Localities of Study (Guide). 
VII. Legal Aspects of Field-Study 
CONDITIONS OF EXISTENCE OF AQUATIC ANIMALS 
I. Introduction: Comparison of Land and Aquatic Anita 
II. Chemical Conditions 
III. Physical Conditions . 
IV. Elementary Food Substances 
V. Quantity of Life in Water . 
ANIMAL CoMMUNITIES OF LARGE LAKES (LAKE MICHIGAN) 
I. Conditions 
II. Communities of the Take 
Ill. Summary . 
ANIMAL COMMUNITIES OF STREAMS 
I. Introduction . 
II... Communities of criearne 
III. Special Stream Problems 
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