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CONTENTS.

II. EQUATORIAL VESTITION. ..
The Equatorial Forest-belt and its Causes--General Features of the Equa-

torial Foresti-Low-growth Forest-trees-Flowery Trunks and their
Probable ('llle-l'ies of Eylatorial Forest-trees --The Climbing Plauts
of the Equatorial Forests --Palms-l'ses of Palm-trees and their Pro.
ducts-Ferns-Ginger-worts and Wild Lanan:s-- Aruus--Screw-Pines-
Orchids-- Bamboos-l'ses of the Lamboo- Mangroves-Sensitive-plants
-('omparative Scarcity of Flowers--Concluding Remarks on Tropical

Vegetation . ............. paujes 27-08

Tropical NATURE,

Structure-Colours and Ornament: -Descriptive Names — The Motions and

Habits of lumin..Birds-Display of Ornaments by the Male - Food
--Geocraphical Distribution and Variation-Ilunminy-Birils of Juan
Fernandez as illu-traine Variation and Natural Selection - The Relations
and Affinities of Ilumin.-Biris-How to Determine Doubtful Afinities
--Resemblances of Swists and Humming-Birds-Differences between
Sun-birds and Ilummin-Birds . . . . · ·:· Pe

V. The Colours OF ANIMALS AND SEXCAL SELEction,
General Pheromena of Colour-Theory of Ileat and Light as producing

Colour-Changes of Culour in Animals produced by Coloured Light-
(lassification of Oranic Colours-Protective Colours---Warning Colours
-Sexual Coloury--Typical Colours - The Nature of Colour-How Animal
Colours are Produced - Colour a Normal Product of Organization - Theory
of Protective Colours-Theory of Warning Colours -- Imitative Warning
Colours- The Theory of Mimicry-Theory of Sexual Colours-Colour
as a means of Reco nition-Colour proportionate to Integrimentary
Development --Selection by Females not a Cause of Colour-Probable L'se
of the llorns of Bretles- Cause of the greater Drillincy of some Female
Insects-Origin of the Ornamental Plumage of Male Birds---Theory of
the Displity of Ornaments by Miles-Natural Selection as neutralizing
Sexual Selection---Greater Brilliancy of some Female Birds-Colour-
development as illustratoil by II umming-Biris--Theory of Typical Colours

-Local Causes of Culour-levelopment-Summary on Colour-development
in Animals-Concluding Remarks on Causes of Bright Colour in the
Tropies . . . . . . . . . . . . . . . . gis 158-220

TROPICAL NATURE,

AND OTHER ESSAYS.

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