On the Origin of Species, published on 24 November 1859, is a work of scientific literature by Charles Darwin which is considered to be the foundation of evolutionary biology. Its full title was On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. For the sixth edition of 1872, the short title was changed to The Origin of Species. Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. It presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution. Darwin included evidence that he had gathered on the Beagle expedition in the 1830s and his subsequent findings from research, correspondence, and experimentation.
CHAPTER I. VARIATION UNDER DOMESTICATION.
CHAPTER II. VARIATION UNDER NATURE.
CHAPTER III. STRUGGLE FOR EXISTENCE.
CHAPTER IV. NATURAL SELECTION; OR THE SURVIVAL OF THE FITTEST.
CHAPTER V. LAWS OF VARIATION.
CHAPTER VI. DIFFICULTIES OF THE THEORY.
CHAPTER VII. MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION.
CHAPTER VIII. INSTINCT.
CHAPTER IX. HYBRIDISM.
CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD.
CHAPTER XI. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS.
CHAPTER XII. GEOGRAPHICAL DISTRIBUTION.
CHAPTER XIII. GEOGRAPHICAL DISTRIBUTION--continued.
CHAPTER XIV. MUTUAL AFFINITIES OF ORGANIC BEINGS: MORPHOLOGY -- EMBRYOLOGY -- RUDIMENTARY ORGANS.
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