the males of closely-allied or representative species The female
assuming the characters of the male Plumage of the young in relation to
the summer and winter plumage of the adults On the increase of beauty
in the birds of the world Protective colouring Conspicuously coloured
birds Novelty appreciated Summary of the four chapters on birds.
CHAPTER XVII.
SECONDARY SEXUAL CHARACTERS OF MAMMALS.
The law of battle Special weapons, confined to the males Cause of
absence of weapons in the female Weapons common to both sexes, yet
primarily acquired by the male Other uses of such weapons Their high
importance Greater size of the male Means of defence On the preference
shewn by either sex in the pairing of quadrupeds.
CHAPTER XVIII.
SECONDARY SEXUAL CHARACTERS OF MAMMALS, continued.
Voice Remarkable sexual peculiarities in seals Odour Development of the
hair Colour of the hair and skin Anomalous case of the female being
more ornamented than the male Colour and ornaments due to sexual
selection Colour acquired for the sake of protection Colour, though
common to both sexes, often due to sexual selection On the
disappearance of spots and stripes in adult quadrupeds On the colours
and ornaments of the Quadrumana Summary.
PART III. SEXUAL SELECTION IN RELATION TO MAN, AND CONCLUSION.
CHAPTER XIX.
SECONDARY SEXUAL CHARACTERS OF MAN.
Differences between man and woman Causes of such differences, and of
certain characters common to both sexes Law of battle Differences in
mental powers, and voice On the influence of beauty in determining the
marriages of mankind Attention paid by savages to ornaments Their ideas
of beauty in women The tendency to exaggerate each natural peculiarity.
CHAPTER XX.
SECONDARY SEXUAL CHARACTERS OF MAN, continued.
On the effects of the continued selection of women according to a
different standard of beauty in each race On the causes which interfere
with sexual selection in civilised and savage nations Conditions
favourable to sexual selection during primeval times On the manner of
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