Evolution and Adaptation

About this eBook

Author

Thomas Hunt Morgan

Credits

E-text prepared by Turgut Dincer, Barry Abrahamsen, and the Online Distributed Proofreading Team (http://www.pgdp.net) from page images generously made available by Internet Archive (https://archive.org)

Language

English

Subject

Evolution (Biology)

Category

Text

Project Gutenberg

eBook-No. 63540

Release Date

October 24, 2020

Copyright

Public domain in the USA.

Contents

1. 1.EVOLUTION AND ADAPTATION
2. 2.PREFACE
3. 3.CONTENTS
4. 4.CHAPTER I THE PROBLEM OF ADAPTATION — Structural Adaptations — Adjustments of the Individual to Changes in the Environment — Adaptations for the Good of the Species — Organs of Little Use to the Individual — Changes in the Organism that are of No Use to the Individual or to the Race — Comparison with Inorganic Phenomena
5. 5.CHAPTER II THE THEORY OF EVOLUTION — Evidence in Favor of the Transmutation Theory — THE GEOLOGICAL EVIDENCE — EVIDENCE FROM DIRECT OBSERVATION AND EXPERIMENT — MODERN CRITICISM OF THE THEORY OF EVOLUTION
6. 6.CHAPTER III THE THEORY OF EVOLUTION ( Continued ) — Conclusions
7. 7.CHAPTER IV DARWIN’S THEORIES OF ARTIFICIAL AND OF NATURAL SELECTION — Variation and Competition in Nature — The Theory of Natural Selection
8. 8.CHAPTER V THE THEORY OF NATURAL SELECTION ( Continued ) — Sterility between Species — Weismann’s Germinal Selection
9. 9.CHAPTER VI DARWIN’S THEORY OF SEXUAL SELECTION — General Criticism of the Theory of Sexual Selection
10. 10.CHAPTER VII THE INHERITANCE OF ACQUIRED CHARACTERS AS A FACTOR IN EVOLUTION — Darwin’s Hypothesis of Pangenesis — The Neo-Lamarckian School
11. 11.CHAPTER VIII CONTINUOUS AND DISCONTINUOUS VARIATION AND HEREDITY — Continuous Variation — Frequency of Different Types of Beech Leaves — Heredity and Continuous Variation — Discontinuous Variation — Mendel’s Law [24] — The Mutation Theory of De Vries — Conclusions
12. 12.CHAPTER IX EVOLUTION AS THE RESULT OF EXTERNAL AND INTERNAL FACTORS — The Effect of External Influences — Responsive Changes in the Organism that adapt it to the New Environment — Nägeli’s Perfecting Principle
13. 13.CHAPTER X THE ORIGIN OF THE DIFFERENT KINDS OF ADAPTATIONS — Form and Symmetry — Mutual Adaptation of Colonial Forms — Degeneration — Protective Coloration — Sexual Dimorphism [29] and Trimorphism — Length of Life as an Adaptation — Organs of Extreme Perfection — Secondary Sexual Organs as Adaptations — Individual Adjustments as Adaptations — Color Changes as Individual Adaptations — Increase of Organs through Use and Decrease through Disuse — Reactions of the Organism to Poisons, etc. — Regeneration
14. 14.CHAPTER XI TROPISMS AND INSTINCTS AS ADAPTATIONS
15. 15.CHAPTER XII SEX AS AN ADAPTATION — The Different Kinds of Sexual Individuals — The Determination of Sex — Sex as a Phenomenon of Adaptation
16. 16.CHAPTER XIII SUMMARY AND GENERAL CONCLUSIONS
17. 17.INDEX

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