CONTENTS 



IV. HUMMING-BIRDS : As ILLUSTRATING THE LUXURIANCE OP 

 TROPICAL NATURE 



Structure Colours and Ornaments Descriptive Names The Motions and 

 Habits of Humming-birds Display of Ornaments by the Male Food 

 Nests Geographical Distribution and Variation Humming-birds 

 of Juan Fernandez as illustrating Variation and Natural Selection 

 The Eolations and Affinities of Humming-birds How to Determine 

 Doubtful Affinities Resemblances of Swifts and Humming-birds 

 Differences between Sun-birds and Humming-birds Conclusion 



Pages 312-337 



V. THE COLOURS OF ANIMALS AND SEXUAL SELECTION 



General Phenomena of Colour in the Organic World Theory of Heat and 

 Light as producing Colour Changes of Colour in Animals produced 

 by Coloured Light Classification of Organic Colours Protective 

 Colours Warning Colours Sexual Colours Normal Colours The 

 Nature of Colour How Animal Colours are produced Colour a 

 Normal Product of Organisation Theory of Protective Colours 

 Theory of Warning Colours Imitative Warning. Colours The Theory 

 of Mimicry Theory of Sexual Colours Colour as a means of 

 Recognition Colour proportionate to Integumentary Development 

 Selection by Females not a cause of Colour Probable use of the 

 Horns of Beetles Cause of the greater Brilliancy of some Female 

 Insects Origin of the Ornamental Plumage of Male Birds 

 Theory of the Display of Ornaments by Males Natural Selection 

 as neutralising Sexual Selection Greater Brilliancy of some Female 

 Birds Colour - development as illustrated by Humming-birds 

 Theory of Normal Colours Local causes of Colour-development 

 The influence of Locality on Colour in Butterflies and birds Sense - 

 perception influenced by Colour of the Integuments Summary on 

 Colour-development in Animals .... 338-394 



VI. THE COLOURS OF PLANTS AND THE ORIGIN OF THE 

 COLOUR-SENSE 



Source of Colouring Matter in Plants Protective Coloration and Mimicry 

 in Plants Attractive Colours of Fruits Protective Colours of Fruits 

 Attractive Colours of Flowers Attractive Odours in Flowers- 

 Attractive Grouping of Flowers Why Alpine Flowers are so Beauti- 

 fulWhy Allied Species of Flowers differ in Size and Beauty 

 Absence of Colour in Wind -fertilised Flowers The same Theory of 

 Colour applicable to Animals and Plants Relation of the Colours 



