Cover

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Title Page, Copyright, Dedication

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p. 4

CONTENTS

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pp. 7-8

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INTRODUCTION

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pp. 9-34

"'Much the greatest event that ever happened and much the best,' Charles James Fox said of the French Revolution-to me, a remark even more pertinent to the publication of On the Origin of Species. Its greatness would justify the preparation of a variorum text, but there are sounder reasons. The scale on which Darwin carried out..."

ABBREVIATIONS

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p. 35

ON THE ORIGIN OF SPECIES.

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p. 39

Epigraphs

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p. 40

Title-Page

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p. 41

CONTENTS

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pp. 43-49

INSTRUCTION TO BINDER.

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p. 50

ADDITIONS AND CORRECTIONS,

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pp. 51-57

HISTORICAL SKETCH

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pp. 59-70

INTRODUCTION.

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pp. 71-75

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CHAPTER I.

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pp. 77-119

"Causes of Variability-Effects of Habit-Correlation of Growth Inheritance-Character of Domestic Varieties-Difficulty of distinguishing between Varieties and Species-Origin of Domestic Varieties from one or more Species-Domestic Pigeons, their Differences and Origin-Principle of Selection anciently followed, its Effects-Methodical and Unconscious Selection-Unknown..."

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CHAPTER II.

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pp. 120-143

"Variability-Individual differences-Doubtful species-Wide ranging, much diffused, and common species vary most-Species of the larger genera in any country vary more than the species of the smaller genera-Many of the species of the larger genera resemble varieties in being very closely, but unequally, related to..."

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CHAPTER III.

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pp. 144-162

"Bears on natural selection-The term used in a wide sense-Geometrical powers of increase-Rapid increase of naturalised animals and plants-Nature of the checks to increase-Competition universal-Effects of climate-Protection from the number of individuals-Complex relations of all animals and plants throughout nature-Struggle for life most severe between individuals..."

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CHAPTER IV.

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pp. 163-274

"NATURAL SELECTION; OR THE SURVIVAL OF THE FITTEST. Natural Selection-its power compared with man's selection-its power on characters of trifling importance-its power at all ages and on both sexes-Sexual Selection-On the generality of intercrosses between individuals of the same species-Circumstances favourable and unfavourable to Natural Selection,..."

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CHAPTER V.

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pp. 275-320

"Effects of external conditions-Use and disuse, combined with natural selection; organs of flight and of vision-Acclimatisation -Correlation of growth-Compensation and economy of growth -False correlations-Multiple, rudimentary, and lowly organised..."

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CHAPTER VI.

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pp. 321-379

"Difficulties on the theory of descent with modification- Transitions- Absence or rarity of transitional varieties-Transitions in habits of life-Diversified habits in the same species-Species with habits widely different from those of their allies-Organs of extreme perfection-Means of transition-Cases of difficulty-Natura..."

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CHAPTER VII.

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pp. 380-423

"Instincts comparable with habits, but different in their origin-Instincts graduated-Aphides and ants-Instincts variable-Domestic instincts, their origins-Natural instincts of the cuckoo, ostrich, and parasitic bees-Slave-making ants-Hive-bee, its cell-making instinct-Difficulties on the theory of the Natural..."

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CHAPTER VIII.

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pp. 424-474

"Distinction between the sterility of first crosses and of hybrids-Sterility various in degree, not universal, affected by close interbreeding, removed by domestication-Laws governing the sterility of hybrids-Sterility not a special endowment, but incidental on other differences-Causes of the sterility of first crosses..."

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CHAPTER IX.

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pp. 475-520

"On the absence of intermediate varieties at the present day-On the nature of extinct intermediate varieties; on their number-On the vast lapse of time, as inferred from the rate of deposition and of denudation-On the poorness of our paleeontological collections-On the intermittence of geological formations-On the absence of intermediate varieties in anyone formation-On..."

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CHAPTER X.

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pp. 521-561

"On the slow and successive appearance of new species-On their different rates of change-Species once lost do not reappear-Groups of species follow the same general rules in their appearance and disappearance as do single species-On Extinction-On simultaneous changes in the forms of life throughout the..."

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CHAPTER XI.

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pp. 562-610

"Present distribution cannot be accounted for by differences in physical conditions-Importance of barriers-Affinity of the productions of the same continent-Centres of creation-Means of dispersal, by changes of climate and of the level of the land, and by occasional means-Dispersal during the Glacial period..."

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CHAPTER XII.

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pp. 611-645

"Distribution of fresh-water productions-On the inhabitants of oceanic islands-Absence of Batrachians and of terrestrial Mammals- On the relation of the inhabitants of islands to those of the nearest mainland-On colonisation from the nearest source with subsequent modification-Summary of the last and present..."

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CHAPTER XIII.

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pp. 646-718

"CLASSIFICATION groups subordinate to groups-Natural system-Rules and difficulties in classification, explained on the theory of descent with modification-Classification of varieties-Descent always used in classification-Analogical or adaptive characters..."

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CHAPTER XIV.

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pp. 719-759

"Recapitulation of the difficulties on the theory of Natural Selection- Recapitulation of the general and special circumstances in its favour-Causes of the general belief in the immutability of species-How far the theory of natural selection may be extended- Effects of its adoption on the study of Natural history-Concluding..."

GLOSSARY

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pp. 761-771

APPENDIX I

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pp. 773-774

APPENDIX II

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pp. 775-785

APPENDIX I I I

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pp. 787-792

APPENDIX IV

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pp. 793-798

ALPHABETICAL LIST OFCHAPTER SUB-TITLES

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pp. 797-799

INDEX

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pp. 801-816