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CONTENTS.

IV. HCMMING-BIRDS: AS ILLUSTRATING TIIE LUXURIANce or

Tropical NATURE, Structure--Colours and Ornament3-Descriptive Names— The Motions and

Habits of Humming-Birds-Di-play of Ornaments by the Male-Food --Geographical Distribution and Variation--Humminy-Birls of Juan Fernandez as illustrating Variation and Natural Selection-The Relations and Itlinities of Humming-Birds – Ilow to Determine Doubtful Afinities -Resemblances of Swists and Humming-Birds-Differences between Sun-birds and Humming-Lirds . . . . . . . . pages 121-157

V. Tue Colours of ANIMALS AND SEXCAL SELECTION. General Pheromena of Colour - Theory of Ileat anil Light as producing

('olour-Changes of Culour in Animals produced by Coloured Light('lassification of Organic Colours-Protective Colours-- Warning Colours -Sexual Colours--Typical Colours - The Nature of Colour-How Inimal Colours are Produced-l'olour a Normal Product of Organization - Theory of Protective Colours- Theory of Warning Colours -- Imitative Warning Colours, The Theory of Jimiery- Theory of Sexual Colours-Colour as a Means of Recognition--Colour proportionate to Integrimentary Development --Suection by Females not a Cause of Colour-Probable L'se of the Horns of Beetles-Cause of the greater Drilliancy of some Female Insects--Origin of the Ornamental Plumage of Male Birds--- Theory of the Display of Ornaments by Wales-Natural Selection as neutralizing Sexual Selection--Greater Brilliancy of some Female Birds-Colourdevelopment as illustrated by IIumming-Dirds--Theory of Typical Colours -Local Claes of Colour-levelopment--Summary on Colour-development in Animals--Concluding Remarks on Causes of Bright Colour in the Tropies . . . . . . . . . . . . . . . . pigis 153-220

VI. Tue COLOURS OF PLANTS AND THE ORIGIN OF THE COLOUR-SEX:E. Source of Colouriny-matter in Plants-Protective Coloration and Mimicry

in Plants - Attractive Colours of Fruits - Protective Colours of FruitsSeeds how Protected-attractive Colours of Flowers-Attractive Odours in Flowers-Attractive Grouping in Flowers--Why Alpine Flowers are so Beautiful-- Why Allied Species of Flowers differ in Size and Beauty-Absence of Colours in Wind fertilized Flowers-The same Theory of Colour applicable to Animals and Plants-Relation of the Colours of Flowers and their Geographical Distribution-Recent Views as to the Direct Action of Light on the Colours of Flowers and Fruits-Concluding Remarks on the Importance of Colour in the Organic World-Tue ORIGIN OF THE COLOU'R->ESSE.--Suppose Incre.se of Colour-perception within the II-lyrical Periud - ('oncluding liimarks on the Colour-sense

P 'g:8 221—213

TROPICAL NATURE,

AND OTHER ESSAYS.

H3608.78

ona s 7900.92.14

HARVARD UNIVERSITY

LIBRARY
N07 22 1954

LOX DOX: R. CLAY, SOXS, AND TAYLOR,

EREAD STREET NUL.

THE TROPICS.

Lund of the Sun ! where joyous green-robed Spring
And leaf-crowned Summer deck the Earth for ever;
No Winter stern their sweet embrace to sever
And numb to silence every living thing,
But bird and insect ever on the wing,
Flitting 'mid forest glades and tangled bowers,
While the life-giving orb's effulgent beams
Through all the circling year call forth the flowers.
Ilere graceful palms, here luscious fruits have birth ;
The fragrant coffee, life-sustaining rice,
Sweet canes, and wondrous gums, and odorous spice ;
While Flora's choicest treasures crowd the teeming earth.
Beside each cot the golden Orange stands,
And broad-leaved Plantain, pride of Tropic lands.

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