THE ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION; OR THE PRESERVATION OF FAVOURED RACES IN THE STRUGGLE FOR LIFE. By Charles Darwin, M.A., F.R.S., Author of "The Descent of Man," etc., etc. Sixth London Edition, with all Additions and Corrections. The 6th Edition is often considered the definitive edition. CONTENTS AN HISTORICAL SKETCH OF THE PROGRESS OF OPINION ON THE ORIGIN OF SPECIES DETAILED CONTENTS ORIGIN OF SPECIES INTRODUCTION 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 CHAPTER XV RECAPITULATION AND CONCLUSION GLOSSARY OF THE PRINCIPAL SCIENTIFIC TERMS USED IN THE PRESENT VOLUME INDEX THE DESCENT OF MAN AND SELECTION IN RELATION TO SEX By Charles Darwin IN TWO VOLUMES—Vol. I. With Illustrations CONTENTS Introduction Page 1-5 PART I. ON THE DESCENT OF MAN CHAPTER I. The Evidence of the Descent of man from some Lower form. Nature of the evidence bearing on the origin of man—Homologous structures in man and the lower animals—Miscellaneous points of correspondence—Development—Rudimentary structures, muscles, sense-organs, hair, bones, reproductive organs, &c.—The bearing of these three great classes of facts on the origin of man 9-33 CHAPTER II. Comparison of the Mental Powers of Man and the Lower Animals. The difference in mental power between the highest ape and the lowest savage, immense—Certain instincts in common—The emotions—Curiosity—Imitation—Attention—Memory—Imagination—Reason—Progressive improvement—Tools and weapons used by animals—Language—Self-consciousness—Sense of beauty—Belief in God, spiritual agencies, superstitions 34-69 CHAPTER III. Comparison of the Mental Powers of Man and the Lower Animals—continued. The difference in mental power between the highest ape and the lowest savage, immense—Certain instincts in common—The emotions—Curiosity—Imitation—Attention—Memory—Imagination—Reason—Progressive improvement—Tools and weapons used by animals—Language—Self-consciousness—Sense of beauty—Belief in God, spiritual agencies, superstitions 70-106 CHAPTER IV. On the Manner of Development of Man from some Lower Form.