The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432페이지 |
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43개의 결과 중 1 - 5개
48 페이지
... that the really govern- ing conditions of life do not graduate away quite insen- sibly like heat or moisture . I endeavoured , also , to show that intermediate varieties , from existing in lesser numbers 48 [ CHAP . X. IMPERFECTION OF THE.
... that the really govern- ing conditions of life do not graduate away quite insen- sibly like heat or moisture . I endeavoured , also , to show that intermediate varieties , from existing in lesser numbers 48 [ CHAP . X. IMPERFECTION OF THE.
49 페이지
Charles Darwin. show that intermediate varieties , from existing in lesser numbers than the forms which they connect , will gen- erally be beaten out and exterminated during the course of further modification and improvement . The main ...
Charles Darwin. show that intermediate varieties , from existing in lesser numbers than the forms which they connect , will gen- erally be beaten out and exterminated during the course of further modification and improvement . The main ...
67 페이지
... existing species are common in the deposit , but have become extinct in the immediately surrounding sea ; or , con- versely , that some are now abundant in the neighbour- ing sea , but are rare or absent in this particular deposit . It ...
... existing species are common in the deposit , but have become extinct in the immediately surrounding sea ; or , con- versely , that some are now abundant in the neighbour- ing sea , but are rare or absent in this particular deposit . It ...
71 페이지
... existing species ; but some excellent naturalists , as Agassiz and Pictet , maintain that all these tertiary species are specifically distinct , though the distinction is admitted to be very slight ; so that here , unless we believe ...
... existing species ; but some excellent naturalists , as Agassiz and Pictet , maintain that all these tertiary species are specifically distinct , though the distinction is admitted to be very slight ; so that here , unless we believe ...
73 페이지
... more distinct from other allied genera . What geological research has not revealed , is the former existence of infinitely numerous gradations , as fine as existing varieties , con- 31 CHAP . X. ] IN ANY SINGLE FORMATION . 73.
... more distinct from other allied genera . What geological research has not revealed , is the former existence of infinitely numerous gradations , as fine as existing varieties , con- 31 CHAP . X. ] IN ANY SINGLE FORMATION . 73.
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings