The Evolution Debate, 1813-1870

By Charles Darwin; Alfred Russel Wallace et al. | Go to book overview
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I. -On the Law which has regulated the introduction of New Species.Pp. 1-25
Geographical distribution dependent on Geologic Changes
-A Law deduced from well-known Geographical and Geological facts
-The form of a true system of Classification determined by this Law
-Geographical Distribution of Organisms
-Geological Distribution of the forms of Life
-High Organization of very ancient Animals consistent with this Law
-Objections to Forbes' Theory of Polarity
-Rudimentary Organs
II. -On the Tendency of Varieties to depart indefinitely from the Original Type.Pp. 26-44
Instability of Varieties supposed to prove the permanent distinctness of Species
-The Struggle for Existence
-The Law of Population of Species
-The Abundance or Rarity of a Species dependent upon its more or less perfect Adaptation to the Conditions of Existence
-Useful Variations will tend to Increase, useless or hurtful Variations to Diminish
-Superior Varieties will ultimately extirpate the Original Species
-The Partial Reversion of Domesticated Varieties explained
-Lamarck's Hypothesis very different from that now advanced
III. -Mimicry, and other Protective Resemblances among Animals.Pp. 45-129
Test of true and false Theories
-Importance of the Principle of Utility
-Popular Theories of Colour in Animals
-Importance of Concealment as influencing Colour
-Special modifications of Colour
-Theory of Protective Colouring
-Objection that Colour as being dangerous should not exist in Nature
-Mimicry among Lepidoptera
-Lepidoptera mimicking other Insects
-Mimicry among Beetles
-Beetles mimicking other Insects
-Insects mimicking Species of other Orders
-Cases of Mimicry among the Vertebrata
-Mimicry among Snake
-Mimicry among Birds
-Mimicry among Mammals


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