CONTENTS 
xii 
CHAPTER IX 
WARNING COLORATION AND MIMICRY 
The skunk as an example of warning coloration—Warning colours among 
insects—Butterflies—Caterpillars—Mimicry—How mimicry has been 
produced-—Heliconidse—Perfection of the imitation — Other cases of 
mimicry among Lepidoptera—Mimicry among protected groups—Its 
explanation—Extension of the principle—Mimicry in other orders of 
insects—Mimicry among the vertebrata — Snakes — The rattlesnake and 
the cobra — Mimicry among birds—Objections to the theory of mimicry 
—Concluding remarks on warning colours and mimicry 
Pages 232-267 
CHAPTER X 
COLOURS AND ORNAMENTS CHARACTERISTIC OF SEX 
Sex colours in the mollusca and Crustacea — In insects—In butterflies and 
moths — Probable causes of these colours—Sexual selection as a 
supposed cause—Sexual coloration of birds — Cause of dull colours ot 
female birds — Relation of sex colour to nesting habits — Sexual colours 
of other vertebrates—Sexual selection by the struggles of males— 
Sexual characters due to natural selection — Decorative plumage of 
males and its effect on the females—Display of decorative plumage 
by the males—A theory of animal coloration—The origin of accessory 
plumes—Development of accessory plumes and their display—The 
effect of female preference will be neutralised by natural selection — 
General laws of animal coloration—Concluding remarks . 268-300 
CHAPTER XI 
THE SPECIAL COLOURS OF PLANTS : THEIR ORIGIN 
AND PURPOSE 
The general colour relations of plants—Colours of fruits—The meaning of 
nuts—Edible or attractive fruits—The colours of flowers—Modes of 
securing cross-fertilisation — -The interpretation of the facts Summary 
