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The Origin of Species
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Page - 364 - in The Origin of Species

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CHAPTER XI. On the Geological Succession of Organic Beings On the slow and successive appearance of new species—On their different rates of change—Species once lost do not reappear— Groups of species follow the same general rules in their appear- ance and disappearance as do single species—On extinction— On simultaneous changes in the forms of life throughout the world—On the affinities of extinct species to each other and to living species—On the state of development of ancient forms— On the succession of the same types within the same areas— Summary of preceding and present chapter. 1ET US now see whether the several facts and laws relat- . ing to the geological succession of organic beings ^ accord best with the common view of the immutability of species, or with that of their slow and gradual modifica- tion, through variation and natural selection. New species have appeared very slowly, one after another, both on the land and in the waters. Lyell has shown that it is hardly possible to resist the evidence on this head in the case of the several tertiary stages ; and every year tends to fill up the blanks between the stages, and to make the pro- portion between the lost and existing forms more gradual. In some of the most recent beds, though undoubtedly of high antiquity if measured by years, only one or two species are extinct, and only one or two are new, having appeared there for the first time, either locally, or, as far as we know, on the face of the earth. The secondary formations are more broken; but, as Bronn has remarked, neither the appear- ance nor disappearance of the many species embedded in each formation has been simultaneous. Species belonging to different genera and classes have not changed at the same rate, or in the same degree. In the older tertiary beds a few living shells may still be found in the midst of a multitude of extinct forms. Falconer has 364.
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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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