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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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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

  1. EDITOR'S INTRODUCTION 5
  2. AN HISTORICAL SKETCH of the Progress of Opinion on the Origin of Species 9
  3. INTRODUCTION 21
  4. Variation under Domestication 25
  5. Variation under Nature 58
  6. Struggle for Existence 76
  7. Natural Selection; or the Survival of the Fittest 93
  8. Laws of Variation 145
  9. Difficulties of the Theory 178
  10. Miscellaneous Objections to the Theory of Natural Selection 219
  11. Instinct 262
  12. Hybridism 298
  13. On the Imperfection of the Geological Record 333
  14. On the Geological Succession of Organic Beinss 364
  15. Geographical Distribution 395
  16. Geographical Distribution - continued 427
  17. Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Organs 450
  18. Recapitulation and Conclusion 499
  19. GLOSSARY 531
  20. INDEX 541
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