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ON THE

ORIGIN OF SPECIES.

"But with regard to the material world, we can at least go Bo far as this—we can perceive that events are brought about not by insulated interpositions of Divine power, exerted in each particular case, but by the establishment of general laws."

Wheweix: Bridgewater Treatise.

"The only distinct meaning of the word 'natural' is stated, fixed, or settled; since what is natural as much requires and presupposes an intelligent agent to render it so, i.e. to effect it continually or at stated times, as what is supernatural or miraculous does to effect it for once."

Butler: Analogy of Revealed Religion.

"To conclude, therefore, let no man out of a weak conceit of sobriety, or an ill-applied moderation, think or maintain, that a man can search too far or be too well studied in the book of God's word, or in the book of God's works; divinity or philosophy; but rather let men endeavour an endless progress or proficience in both."

Bacon: Advancement of Learning.

Down, Bromley, Kent,

October 1st, 1859. (1st Thousand.)

'Third Edit., March, 1861.

ON

THE ORIGIN OF SPECIES

BY'MEANS OF NATURAL SELECTION,

OR THE

PEESEEVATION OF FAVOURED RACES IN THE STRUGGLE

FOE LIFE.

By CHARLES DARWIN, M.A.,

FELLOW OF THE ROYAL, GEOLOGICAL, LINNEAN, ETC, SOCIETIES;
ACTKOR OF 'JOURNAL OF RESEARCHES DURING H. M. S. BEAGLE'S VOYAGE ROUND THE WORLD.'

THIRD EDITION, WITH ADDITIONS AND CORRECTIONS.

(SEVENTH THOUSAND.)

[merged small][graphic]

BY THE SAME AUTHOR.

A NATURALIST'S VOYAGE ROUND THE WORLD; or

A Journal Of Researches Into the Natural History and Geology of the
Countries visited during the Voyage of H.M.S. Beagle, under the Command of
Capt. Friz-roy, R.N. Tenth Thousand. Post 8vo. 9s.

ON THE STRUCTURE AND DISTRIBUTION OF CORAL

REEFS.

GEOLOGICAL OBSERVATIONS ON VOLCANIC ISLANDS.
GEOLOGICAL OBSERVATIONS ON SOUTH AMERICA.
A MONOGRAPH OF THE CIRRIPEDIA. 2 Vols. 8vo.

LONDON I FEINTED BT W. CLOWES AND SONS, STAMFORD STEEET.
AND CHARING CROSS.

CONTENTS.

Additions And Corrections, To The Second And Third

Editions . Page xi-xii

Historical Sketch xiii-xix

Introduction ....: 1-6

CHAPTER I.

Variation Under Domestication.

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
Origin of our Domestic Productions — Circumstances favourable
to Man's power of Selection; 7-44

CHAPTER II.
Variation Under Nature.

Variability — Individual differences — Doubtful species — Wide
ranging, much diffused, and common species vary most — Spe-
cies 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 each other, and in having restricted ranges .. .. 45-62

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