Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1889 - 494 páginas |
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Página x
... species inhabit distinct areas - Adaptation to conditions at various periods of life - The continued existence of low forms of life - Extinction of low types among the higher animals— Circumstances favourable to the origin of new species ...
... species inhabit distinct areas - Adaptation to conditions at various periods of life - The continued existence of low forms of life - Extinction of low types among the higher animals— Circumstances favourable to the origin of new species ...
Página xi
... DISTINCT SPECIES AND THE USUAL STERILITY OF THEIR HYBRID OFFSPRING Statement of the problem - Extreme susceptibility of the reproductive functions - Reciprocal crosses -Individual differences in respect to cross - fertilisation ...
... DISTINCT SPECIES AND THE USUAL STERILITY OF THEIR HYBRID OFFSPRING Statement of the problem - Extreme susceptibility of the reproductive functions - Reciprocal crosses -Individual differences in respect to cross - fertilisation ...
Página 2
... distinct species , because , in the first place , they always differ from each other in certain slight peculiarities of structure , form , and habits , and , in the second ... species of the genus Viola . But , as these 2 CHAP . DARWINISM.
... distinct species , because , in the first place , they always differ from each other in certain slight peculiarities of structure , form , and habits , and , in the second ... species of the genus Viola . But , as these 2 CHAP . DARWINISM.
Página 3
... species of the genus Viola . But , as these also each produce their like and do not intermingle , it was believed that every one of them had always been as distinct from all the others as it is now , that all the individuals of each ...
... species of the genus Viola . But , as these also each produce their like and do not intermingle , it was believed that every one of them had always been as distinct from all the others as it is now , that all the individuals of each ...
Página 4
... species of animals and plants had been produced in orderly succession from each other by the action of unknown laws ... distinct species , nor was any reason given why such slight yet constant differences should exist at all . Scientific ...
... species of animals and plants had been produced in orderly succession from each other by the action of unknown laws ... distinct species , nor was any reason given why such slight yet constant differences should exist at all . Scientific ...
Outras edições - Ver tudo
Darwinism: An Exposition of the Theory of Natural Selection, with Some of ... Alfred Russel Wallace Visualização integral - 1890 |
Darwinism: An Exposition of the Theory of Natural Selection, with Some of ... Alfred Russel Wallace Visualização integral - 1890 |
Darwinism: An Exposition of the Theory of Natural Selection ..., Volumes 1-2 Alfred Russel Wallace Visualização integral - 1889 |
Palavras e frases frequentes
abundant adapted adduced allied species America amount animals and plants appears birds breed brilliant butterflies cause characters climate closely allied colours of animals common concealment conspicuous continued cross-fertilisation crossed curious Darwin dicotyledons distinct species domestic animals effects eggs enemies Eocene evidence extinct facts faculty favourable female fertile fertilised flowers genera genus geological groups habits hybrids important increase individuals infertility inhabit insects intercrossing kind larva larvæ less living male mammalia mammals markings marsupials mimicry Miocene mode modified moths natural selection naturalists nests occur offspring organs Origin of Species peculiar pigeons Pliocene pollen portion possess probably produced Professor protectively coloured pupa regions remarkable resemblance seeds self-fertilisation Silurian similar specimens spots sterility structure struggle for existence supposed tail theory tints tion toes trees tropical usually variability variation varied varieties vegetation warning colours whole wild wings Zealand