On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)

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 gen...

CLASSIFICATION, groups subordinate to groups--Natural system--Rules and difficulties in classification, explained on the theory of descent with modification--Classification of v...

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...

Effects of external conditions--Use and disuse, combined with natural selection; organs of flight and of vision--Acclimatisation--Correlation of growth--Compensation and economy...

Instincts comparable with habits, but different in their origin--Instincts graduated--Aphides and ants--Instincts variable--Domestic instincts, their origin--Natural instincts o...

Causes of Variability--Effects of Habit--Correlation of Growth--Inheritance--Character of Domestic Varieties--Difficulty of distinguishing between Varieties and Species--Origin...

Present distribution cannot be accounted for by differences in physical conditions--Importance of barriers--Affinity of the productions of the same continent--Centres of creatio...

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...

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 t...

Distinction between the sterility of first crosses and of hybrids--Sterility various in degree, not universal, affected by close interbreeding, removed by domestication--Laws go...

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 ra...

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...

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--Co...

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...

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...

throughout time; in the eleventh and twelfth, their geographical distribution throughout space; in the thirteenth, their classification or mutual affinities, both when mature an...

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 gen...

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 t...

of correlation of growth. In the four succeeding chapters, the most apparent and gravest difficulties on the theory will be given: namely, first, the difficulties of transitions...

CLASSIFICATION, groups subordinate to groups--Natural system--Rules and difficulties in classification, explained on the theory of descent with modification--Classification of v...

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 ra...

Its bearing 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 increa...

Distinction between the sterility of first crosses and of hybrids--Sterility various in degree, not universal, affected by close interbreeding, removed by domestication--Laws go...

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...

Effects of external conditions--Use and disuse, combined with natural selection; organs of flight and of vision--Acclimatisation--Correlation of growth--Compensation and economy...

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...

Causes of Variability--Effects of Habit--Correlation of Growth--Inheritance--Character of Domestic Varieties--Difficulty of distinguishing between Varieties and Species--Origin...

Present distribution cannot be accounted for by differences in physical conditions--Importance of barriers--Affinity of the productions of the same continent--Centres of creatio...

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...

Instincts comparable with habits, but different in their origin--Instincts graduated--Aphides and ants--Instincts variable--Domestic instincts, their origin--Natural instincts o...