: The Descent of Man and Selection in Relation to Sex Vol. II (1st Edition) by Darwin Charles - Evolution (Biology); Human beings Origin; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences

@FreeBooks

Posted in: #FreeBooks #FreeBooksIndia #FreeBooksApp #gg

Vote Up Vote Down   0 Reactions

Login to give Reaction!

SECONDARY SEXUAL CHARACTERS OF FISHES, AMPHIBIANS, AND REPTILES.

FISHES: Courtship and battles of the males--Larger size of the females--Males, bright colours and ornamental appendages; other strange characters--Colours and appendages acquired by the males during the breeding-season alone--Fishes with both sexes brilliantly coloured--Protective colours--The less conspicuous colours of the female cannot be accounted for on the principle of protection--Male fishes building nests, and taking charge of the ova and young. AMPHIBIANS: Differences in structure and colour between the sexes--Vocal organs. REPTILES: Chelonians--Crocodiles--Snakes, colours in some cases protective--Lizards, battles of--Ornamental appendages--Strange differences in structure between the sexes--Colours--Sexual differences almost as great as with birds Page 1-37

SECONDARY SEXUAL CHARACTERS OF BIRDS.

Sexual differences--Law of battle--Special weapons--Vocal organs--Instrumental music--Love-antics and dances--Decorations, permanent and seasonal--Double and single annual moults--Display of ornaments by the males 38-98

Choice exerted by the female--Length of courtship--Unpaired birds--Mental qualities and taste for the beautiful--Preference or antipathy shewn by the female for particular males--Variability of birds--Variations sometimes abrupt--Laws of variation--Formation of ocelli--Gradations of character--Case of Peacock, Argus pheasant, and Urosticte 99-153

Discussion why the males alone of some species, and both sexes of other species, are brightly coloured--On sexually-limited inheritance, as applied to various structures and to brightly-coloured plumage--Nidification in relation to colour--Loss of nuptial plumage during the winter 154-182

The immature plumage in relation to the character of the plumage in both sexes when adult--Six classes of cases--Sexual differences between 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 183-238

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 239-273

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 274-315

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 woman--The tendency to exaggerate each natural peculiarity 316-354

Free books android app tbrJar TBR JAR Read Free books online gutenberg

(0)

Login to post a comment!