The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 46
... difference between the species which are crossed . Nor is it sur- prising that the facility of effecting a first ... widely different circum- stances should all run , to a certain extent , parallel with the systematic affinity of the ...
... difference between the species which are crossed . Nor is it sur- prising that the facility of effecting a first ... widely different circum- stances should all run , to a certain extent , parallel with the systematic affinity of the ...
Página 69
... separate formation , like the whole pile of formations in any country , has generally been intermittent in its accumulation . When we see , as is so often the case , a formation composed of beds of widely different mineralogical ...
... separate formation , like the whole pile of formations in any country , has generally been intermittent in its accumulation . When we see , as is so often the case , a formation composed of beds of widely different mineralogical ...
Página 71
... different sub - stages of the same formation . Some experienced conchologists are now sinking many of the very fine ... different , yet are far more closely related to each other than are the species found in more widely separated ...
... different sub - stages of the same formation . Some experienced conchologists are now sinking many of the very fine ... different , yet are far more closely related to each other than are the species found in more widely separated ...
Página 108
... widely different from all other mammals , but the tertiary Zeuglodon and Squalodon , which have been placed by some ... wide interval between birds and reptiles has been shown by the naturalist just quoted to be partially bridged over in ...
... widely different from all other mammals , but the tertiary Zeuglodon and Squalodon , which have been placed by some ... wide interval between birds and reptiles has been shown by the naturalist just quoted to be partially bridged over in ...
Página 111
... widely different forms . If many extinct forms were to be discovered above one of the middle hori- zontal lines or geological formations - for instance , above No. VI . - but none from beneath this line , then only two of the families ...
... widely different forms . If many extinct forms were to be discovered above one of the middle hori- zontal lines or geological formations - for instance , above No. VI . - but none from beneath this line , then only two of the families ...
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Términos y frases comunes
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