Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1889 - 494 páginas |
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Página 51
... spots differ exceedingly in different individuals of the same species in respect to the size , shape , and number of these marks , and in the general aspect of the plumage resulting from such variations . " In the common 1 See Winter ...
... spots differ exceedingly in different individuals of the same species in respect to the size , shape , and number of these marks , and in the general aspect of the plumage resulting from such variations . " In the common 1 See Winter ...
Página 62
... spot , placed at a proportionate distance , right and left , from the median line accordingly as it varies in excess ... spots without overlapping each other . In the diagram opposite twenty males of Icterus Baltimore are registered , so ...
... spot , placed at a proportionate distance , right and left , from the median line accordingly as it varies in excess ... spots without overlapping each other . In the diagram opposite twenty males of Icterus Baltimore are registered , so ...
Página 63
... spots , showing in some of the characters a tendency to segregation into two or more groups of individuals , each vary- ing considerably from the mean . In order fully to appreciate the teaching of these diagrams , VARIATION OF IOTERUS ...
... spots , showing in some of the characters a tendency to segregation into two or more groups of individuals , each vary- ing considerably from the mean . In order fully to appreciate the teaching of these diagrams , VARIATION OF IOTERUS ...
Página 90
... spot , which is a white bird with a red tail and red spot on the forehead , and the mongrel offspring were dusky and mottled . On now crossing these two sets of mongrels with each other , he obtained a bird of a beautiful blue colour ...
... spot , which is a white bird with a red tail and red spot on the forehead , and the mongrel offspring were dusky and mottled . On now crossing these two sets of mongrels with each other , he obtained a bird of a beautiful blue colour ...
Página 93
... Spots are white , with the tail and a spot on the forehead red . The Swallows are slender , white in colour , with the head and wings of some darker colour . Besides these races and sub - races a number of other kinds have been ...
... Spots are white , with the tail and a spot on the forehead red . The Swallows are slender , white in colour , with the head and wings of some darker colour . Besides these races and sub - races a number of other kinds have been ...
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