TABLE OF CONTENTS 



PAGES 



INTRODUCTION xix-xxii 



PART I 



THE THEORY OF ORGANIC EVOLUTION 3-83 



Natural Selection .......... 3-47 



Heredity 3-10 



Variation . . . . . . . . . . . 7-10 



The Struggle for Existence ....... 10-18 



Mutation 18-20 



General Principles in the Operation of Natural Selection . . 20-28 



Artificial Selection ......... 28-31 



Objections to Natural Selection as a Factor in Evolution . . 31-47 



Sexual Selection .......... 47-60 



Objections to the Theory of Sexual Selection .... 56-60 



Segregation . . . . . . . . . . . 60-67 



The Inheritance of Parental Modifications ..... 67-82 



Summary of Part I .......... 82-83 



PART II 



THE PHENOMENA EXPLAINED BY THE THEORY 87-163 



Comparative Anatomy ......... 88-96 



Classification .......... 88-92 



Homology 9-~93 



Vestigial Structures 93-96 



Embryology ........... 96-103 



Paleontology 103-111 



Geographical Distribution . .111-116 



Color in Animals . . . . . . . . . .116-151 



Protective Coloration and Resemblances . ... 117-125 



Aggressive Coloration and Resemblances 125-127 



28964 



