Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1889 - 494 páginas |
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Página xiv
... wild animals - Difficulty as to co - adaptation of parts by variation and selection -- Direct action of the environment The American school of evolutionists - Origin of the feet of the ungulates - Supposed action of animal intelligence ...
... wild animals - Difficulty as to co - adaptation of parts by variation and selection -- Direct action of the environment The American school of evolutionists - Origin of the feet of the ungulates - Supposed action of animal intelligence ...
Página 12
... wild dog or the cauliflower from any wild plant . But animals or plants which thus differ in a state of nature are always classed as distinct species , and thus we see how , by the continuous survival of the fittest or the preservation ...
... wild dog or the cauliflower from any wild plant . But animals or plants which thus differ in a state of nature are always classed as distinct species , and thus we see how , by the continuous survival of the fittest or the preservation ...
Página 13
... wild animals as well as in those which are domesti- cated . It is necessary also to prove that all organisms do tend to increase at the great rate alleged , and that this increase actually occurs , under favourable conditions . have to ...
... wild animals as well as in those which are domesti- cated . It is necessary also to prove that all organisms do tend to increase at the great rate alleged , and that this increase actually occurs , under favourable conditions . have to ...
Página 15
... wild , the weeds that first take possession of it , often covering the whole surface of the ground with two or three different kinds , will themselves be supplanted by others , so that in a few years many of the original flowers and of ...
... wild , the weeds that first take possession of it , often covering the whole surface of the ground with two or three different kinds , will themselves be supplanted by others , so that in a few years many of the original flowers and of ...
Página 16
... wild in New Zealand . But Sir Joseph Hooker informs us that the late Mr. Bidwell habitually scattered Australian seeds during his extensive travels in New Zealand , yet only two or three Australian plants appear to have established ...
... wild in New Zealand . But Sir Joseph Hooker informs us that the late Mr. Bidwell habitually scattered Australian seeds during his extensive travels in New Zealand , yet only two or three Australian plants appear to have established ...
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