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Dr Sano.
FIDELISAME
123 FRONT ST
NE
RK.
366808
N 111
ON
THE ORIGIN OF SPECIES
BY
MEANS OF NATURAL SELECTION,
OR THE
PRESERVATION OF FAVORED RACES IN THE STRUGGLE FOR LIFE.
AUTHOR OF
CHARLES DARWIN, M. A., F.R.S.,
66 JOURNAL OF RESEARCHES DURING H. M. S. BEAGLE'S VOYAGE ROUND THE WORLD," ETC., ETC.
GELOSCHT
OFFENTL BUCHERHALLE
FIFTH EDITION, WITH ADDITIONS AND CORRECTIONS.
HAMBURG
NEWS
YORK:
D. APPLETON AND COMPANY,
549 & 551 BROADWAY.
1872.
OFFENTLICHE BUCHER
1901 $457.
HISTORICAL SKETCH
INTRODUCTION
CONTENTS
PAGE 9
17
CHAPTER I.
VARIATION UNDER DOMESTICATION.
Causes of Variability-Effects of Habit-Correlated Variation-Inheritance-Char-
acter 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-Principles of Selection, anciently followed,
their Effects-Methodical and Unconscious Selection-Unknown Origin of our
Domestic Productions-Circumstances favorable to Man's Power of Selection 22
CHAPTER II.
VARIATION UNDER NATURE,
Variability-Individual Differences-Doubtful Species-Wide-ranging, much dif
fused, and Common Species, vary most-Species of the Larger Genera in each
Country vary more frequently 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
52
CHAPTER III.
STRUGGLE FOR EXISTENCE.
ats bearing on Natural Selection-The Term used in a wide Sense-Geometrical Ratio
of Increase-Rapid Increase of Naturalized 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 through