CONTENTS 



EDITOR'S INTRODUCTION, by Edward Lurie ix 



A NOTE ON THE TEXT xxxiv 



CHAPTER I. THE FUNDAMENTAL RELATIONS OF ANI- 

 MALS TO ONE ANOTHER AND TO THE WORLD IN 

 WHICH THEY LIVE AS THE BASIS OF THE NATURAL 

 SYSTEM OF ANIMALS 



Section I. The Leading Features of a Natural Zoological System 



Are All Founded in Nature 3 



II. Simultaneous Existence of the Most Diversified Types 



under Identical Circumstances 13 



III. Repetition of Identical Types under the Most Diversi- 

 fied Circumstances 18 



IV. Unity of Plan in Otherwise High Diversified Types 20 

 V. Correspondence in the Details of Structure in Animals 



Otherwise Entirely Disconnected 21 



VI. Various Degrees and Different Kinds of Relationship 



among Animals 24 



VII. Simultaneous Existence in the Earliest Geological Pe- 

 riods of All the Great Types of Animals 26 

 VIII. The Gradation of Structure among Animals 29 

 IX. Range of the Geographical Distribution of Animals 34 

 X. Identity of Structure of Widely Distributed Types 40 

 XI. Community of Structure among Animals Living in the 



Same Regions 46 



XII. Serial Connection in the Structure of Animals Widely 



Scattered upon the Surface of Our Globe 49 



XIII. Relation between the Size of Animals and Their Struc- 

 ture 54 



