Page - 58 - in The Origin of Species
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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 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.
BEFORE applying the principles arrived at in the
lastchapter
to organic beings in a state of nature, we
mustbriefly
discuss whether these latter are subject to any
variation. To treat this subject properly, a long catalogue of
dry facts ought to be given ; but these I shall reserve for a
future work. Nor shall I here discuss the various definitions
which have been given of the term species. No one defini-
tion has satisfied all naturalists; yet every naturalist knows
vaguely what he means when he speaks of a species. Gen-
erally the term includes the unknown element of a distinct
act of creation. The term "variety" is almost equally diffi-
cult to define
; but here community of descent is almost uni-
versally implied, though it can rarely be proved. We have
also what are called monstrosities
; but they graduate into
varieties. By a monstrosity I presume is meant some consid-
erable deviation of structure, generally injurious, or not use-
ful to the species. Some authors use the term "variation" in
a technical sense, as implying a modification directly due to
the physical conditions of life; and "variations" in this sense
are supposed not to be inherited; but who can say that the
dwarfed condition of shells in the brackish waters of the
Baltic, or dwarfed plants on Alpine summits, or the thicker
fur of an animal from far northwards, would not in some
cases be inherited for at least a few generations ? and in this
case I presume that the form would be called a variety.
It may be doubted whether sudden and considerable devi-
58
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book The Origin of Species"
The Origin of Species
- Title
- The Origin of Species
- Author
- Charles Darwin
- Publisher
- P. F. Collier & Son
- Location
- New York
- Date
- 1909
- Language
- English
- License
- PD
- Size
- 10.5 x 16.4 cm
- Pages
- 568
- Keywords
- Evolutionstheorie, Evolution, Theory of Evolution, Naturwissenschaft, Natural Sciences
- Categories
- International
- Naturwissenschaften Biologie
Table of contents
- EDITOR'S INTRODUCTION 5
- AN HISTORICAL SKETCH of the Progress of Opinion on the Origin of Species 9
- INTRODUCTION 21
- Variation under Domestication 25
- Variation under Nature 58
- Struggle for Existence 76
- Natural Selection; or the Survival of the Fittest 93
- Laws of Variation 145
- Difficulties of the Theory 178
- Miscellaneous Objections to the Theory of Natural Selection 219
- Instinct 262
- Hybridism 298
- On the Imperfection of the Geological Record 333
- On the Geological Succession of Organic Beinss 364
- Geographical Distribution 395
- Geographical Distribution - continued 427
- Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Organs 450
- Recapitulation and Conclusion 499
- GLOSSARY 531
- INDEX 541