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CONTENTS.

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Test of true and false Theories-Importance of the Principle of Utility
-Popular Theories of Colour in Animals-Importance of Conceal-
ment as influencing Colour-Special modifications of Colour-Theory
of Protective Colouring-Objection that Colour as being dangerous
should not exist in Nature-Mimicry-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
Snakes—Mimicry among Birds—Mimicry among Mammals—Objec-

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cation.

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Difficulties on the Theory of Natural Selection-The Origin of Some
of Man's Mental Faculties, by the preservation of Useful Variations,
not possible--Difficulty as to the Origin of the Moral Sense-Sum-
mary of the Argument as to the Insufficiency of Natural Selection to
account for the Development of Man-The Origin of Consciousness
-The Nature of Matter-Matter is Force-All Force is probably
Will-force-Conclusion
Pp. 332-371

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