Index of the Project Gutenberg Works of Charles Darwin · Charles Darwin
SECTION THIRD 183-197
An attempt to explain the foregoing laws of geographical distribution, on the theory of allied species having a common descent Improbability of finding fossil forms intermediate between existing species CHAPTER VII ON THE NATURE OF THE AFFINITIES AND CLASSIFICATION OF ORGANIC BEINGS. 198-213 Gradual appearance and disappearance of groups What is the Natural System? On the kind of relation between distinct groups Classification of Races or Varieties Classification of Races and Species similar Origin of genera and families {x} CHAPTER VIII UNITY OF TYPE IN THE GREAT CLASSES; AND MORPHOLOGICAL STRUCTURES. Unity of Type Morphology Embryology Attempt to explain the facts of embryology On the graduated complexity in each great class Modification by selection of the forms of immature animals Importance of embryology in classification Order in time in which the great classes have first appeared 214-230 The abortive organs of Naturalists The abortive organs of Physiologists Abortion from gradual disuse 231-238 Recapitulation Why do we wish to reject the Theory of Common Descent? Conclusion 239-255 Index 257 Portrait frontispiece Facsimile to face p. 50 ON THE ORIGIN OF SPECIES. OR THE PRESERVATION OF FAVOURED RACES IN THE STRUGGLE FOR LIFE. By Charles Darwin, INTRODUCTION. 1. VARIATION UNDER DOMESTICATION. 2. VARIATION UNDER NATURE. 3. STRUGGLE FOR EXISTENCE. 4. NATURAL SELECTION 5. LAWS OF VARIATION. 6. DIFFICULTIES ON THEORY. 7. INSTINCT. 8. HYBRIDISM. 9. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD. 10. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS. 11. GEOGRAPHICAL DISTRIBUTION. 12. GEOGRAPHICAL DISTRIBUTION—continued. 13. MUTUAL AFFINITIES OF ORGANIC BEINGS: MORPHOLOGY: 14. RECAPITULATION AND CONCLUSION.
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