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
... occur- ring when required - The beginnings of important organs - The mam- mary glands - The eyes of flatfish - Origin of the eye - Useless or non - adaptive characters - Recent extension of the region of utility in plants — The same in ...
... occur- ring when required - The beginnings of important organs - The mam- mary glands - The eyes of flatfish - Origin of the eye - Useless or non - adaptive characters - Recent extension of the region of utility in plants — The same in ...
Página 5
... occur within definite limits where no obstacles prevent their wider distribution leads to the further inference that these limits were assigned to them from the beginning , and so we should come to the final conclusion that the order ...
... occur within definite limits where no obstacles prevent their wider distribution leads to the further inference that these limits were assigned to them from the beginning , and so we should come to the final conclusion that the order ...
Página 30
... occur in immense profusion over extensive areas , although each plant produces comparatively few seeds ; while several species of bell - flowers , gentians , pinks , and mulleins , and even some of the composita , which produce an ...
... occur in immense profusion over extensive areas , although each plant produces comparatively few seeds ; while several species of bell - flowers , gentians , pinks , and mulleins , and even some of the composita , which produce an ...
Página 41
... Now , however , a collection is valued in proportion as it contains illustrative specimens of all the varieties that occur in each species , and in some cases these have been carefully described , so that we possess a.
... Now , however , a collection is valued in proportion as it contains illustrative specimens of all the varieties that occur in each species , and in some cases these have been carefully described , so that we possess a.
Página 42
... occurring in a state of nature . Wild animals and plants , it is said , are usually stable , and when variations occur ... occur so rarely as not to afford any aid in the supposed formation of new species . ; This objection , as will be ...
... occurring in a state of nature . Wild animals and plants , it is said , are usually stable , and when variations occur ... occur so rarely as not to afford any aid in the supposed formation of new species . ; This objection , as will be ...
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