Additions and Corrections, to the Sixth Editionxv Historical Sketchxviii Introduction1 Chapter I.Variation under Domestication7 Chapter II.Variation under Nature51 Chapter III.Struggle for Existence75 Chapter IV.Natural Selection; or the Survival of the Fittest97 Chapter V.Laws of Variation164 Chapter VI.Difficulties of the Theory207 Chapter VII.Miscellaneous Objections to the Theory of Natural Selection262 Chapter VIII.Instinct319 Chapter IX.Hybridism365 Chapter X.On the Imperfection of the Geological Record412 Chapter XI.On the Geological Succession of Organic Beings453 Chapter XII.Geographical Distribution493 Chapter XIII.Geographical Distribution--continued535 Chapter XIV.Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Organs566 Chapter XV.Recapitulation and Conclusion631 Glossary of Scientific Terms671 Index687
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