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CONTENTSIV. HUMMING-BIRDS : As ILLUSTRATING THE LUXURIANCE OPTROPICAL NATUREStructure Colours and Ornaments Descriptive Names The Motions andHabits of Humming-birds Display of Ornaments by the Male FoodNests Geographical Distribution and Variation Humming-birdsof Juan Fernandez as illustrating Variation and Natural SelectionThe Eolations and Affinities of Humming-birds How to DetermineDoubtful Affinities Resemblances of Swifts and Humming-birdsDifferences between Sun-birds and Humming-birds ConclusionPages 312-337V. THE COLOURS OF ANIMALS AND SEXUAL SELECTIONGeneral Phenomena of Colour in the Organic World Theory of Heat andLight as producing Colour Changes of Colour in Animals producedby Coloured Light Classification of Organic Colours ProtectiveColours Warning Colours Sexual Colours Normal Colours TheNature of Colour How Animal Colours are produced Colour aNormal Product of Organisation Theory of Protective ColoursTheory of Warning Colours Imitative Warning. Colours The Theoryof Mimicry Theory of Sexual Colours Colour as a means ofRecognition Colour proportionate to Integumentary DevelopmentSelection by Females not a cause of Colour Probable use of theHorns of Beetles Cause of the greater Brilliancy of some FemaleInsects Origin of the Ornamental Plumage of Male BirdsTheory of the Display of Ornaments by Males Natural Selectionas neutralising Sexual Selection Greater Brilliancy of some FemaleBirds Colour - development as illustrated by Humming-birdsTheory of Normal Colours Local causes of Colour-developmentThe influence of Locality on Colour in Butterflies and birds Sense -perception influenced by Colour of the Integuments Summary onColour-development in Animals .... 338-394VI. THE COLOURS OF PLANTS AND THE ORIGIN OF THECOLOUR-SENSESource of Colouring Matter in Plants Protective Coloration and Mimicryin Plants Attractive Colours of Fruits Protective Colours of FruitsAttractive Colours of Flowers Attractive Odours in Flowers-Attractive Grouping of Flowers Why Alpine Flowers are so BeautifulWhyAllied Species of Flowers differ in Size and BeautyAbsence of Colour in Wind -fertilised Flowers The same Theory ofColour applicable to Animals and Plants Relation of the Colours