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ORIGIN OF SPECIES CHAPTER I Variation under Domestication Causes of variability—Effects of habit and theuse or disuse of parts- Correlated variation—Inheritance—Character of domestic varie- ties—Difificulty of distinguishing between varieties and species— Origin of domestic varieties from one or more species—Domestic pigeons, their differences and origin—Principles of selection, an- ciently followed, their efifects—Methodical and unconscious selection—Unknown origin of our domestic productions—Circum- stances favourable to man'spower of selection CAUSES OF VARIABILITY WHEN we compare the individuals of the same variety or sub-variety of our older cultivated plants and animals, one of the first points which strikes us is, that they generally differ more from each other than do the individuals of any one species or variety in a state of nature. And if we reflect on the vast diversity of the plants and animals which have been cultivated, and which have varied during all ages under the most different climates and treatment, we are driven to conclude that this great varia- bility is due to our domestic productions having been raised under conditions of life not so uniform as, and somewhat different from, those to which the parent species had been exposed under nature. There is, also, some probability in the view propounded by Andrew Knight, that this variability may be partly connected with excess of food. It seems clear that organic beings must be exposed during several genera- tions to new conditions to cause any great amount of varia- tion; and that, when the organisation has once begun to vary, it generally continues varying for many generations. No case is on record of a variable organism ceasing to vary wnder cultivation. Our oldest cultivated plants, such as 25
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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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