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An Historical Sketch 5
Introduction 16
Chapter One Variation Under Domestication 21
Chapter Two Variation Under Nature 51
Chapter Three Struggle for Existence 64
Chapter Four Natural Selection 80
Chapter Five Laws of Variation 121
Chapter Six Difficulties on Theory 152
Chapter Seven Instinct 181
Chapter Eight Hybridism 211
Chapter Nine On the Imperfection of the Geological
Record 237
Chapter Ten On the Geological Succession of Organic Beings 263
Chapter Eleven Geographical Distribution 290
Chapter Twelve Geographical Distribution—continued 319
Chapter Thirteen Mutual Affinities of Organic Beings:
Morphology: Embryology:
Rudimentary Organs 341
Chapter Fourteen Recapitulation and Conclusion 379
Glossary 404
Origin of Species 5
