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THE

ORIGIN OF SPECIES

BY MEANS OF NATURAL SELECTION

OR THE PRESERVATION OF FAVORED RACES IN

THE STRUGGLE FOR LIFE

BY

CHARLES DARWIN, M. A., LL. D., F. R. S.

WITH ADDITIONS AND CORRECTIONS
FROM SIXTH AND LAST ENGLISH EDITION

IN TWO VOLUMES

VOLUME I

NEW YORK
D. APPLETON AND COMPANY

1889

Authorized Edition.

CONTENTS.

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CHAPTER II.

VARIATION UNDER NATURE.

Variability - Individual differences — Doubtful species Wide

ranging, much diffused, and common species, vary most,

Species of the larger genera in each country vary more fre-

quently 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

.. 51

97

CHAPTER V.

LAWS OF VARIATION.

Effects of changed conditions—Use and disuse, combined with

natural selection; organs of flight and of vision-Acclimatisa-

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