On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 17
... suppose it would be equally im- portant to keep from blending together ? Why should the degree of sterility be innately variable in the in- dividuals of the same species ? Why should some spe- cies cross with facility , and yet produce ...
... suppose it would be equally im- portant to keep from blending together ? Why should the degree of sterility be innately variable in the in- dividuals of the same species ? Why should some spe- cies cross with facility , and yet produce ...
Página 18
Charles Darwin. sume that no one will suppose that this capacity is a specially endowed quality , but will admit that it is inci- dental on differences in the laws of growth of the two plants . We can sometimes see the reason why one ...
Charles Darwin. sume that no one will suppose that this capacity is a specially endowed quality , but will admit that it is inci- dental on differences in the laws of growth of the two plants . We can sometimes see the reason why one ...
Página 32
... suppose that a botanist found two well - marked varieties ( and such occur ) of the long - styled form of the trimorphic Lythrum salicaria , and that he determined to try by crossing whether they were specifically distinct . He would ...
... suppose that a botanist found two well - marked varieties ( and such occur ) of the long - styled form of the trimorphic Lythrum salicaria , and that he determined to try by crossing whether they were specifically distinct . He would ...
Página 50
... suppose that links directly intermediate between them ever existed , but between each and an unknown common parent . The common parent will have had in its whole organisation much general re- semblance to the tapir and to the horse ...
... suppose that links directly intermediate between them ever existed , but between each and an unknown common parent . The common parent will have had in its whole organisation much general re- semblance to the tapir and to the horse ...
Página 67
... suppose that it then became extinct . We forget how small the area of Europe is compared with the rest of the world ; nor have the sev- eral stages of the same formation throughout Europe been correlated with perfect accuracy . We may ...
... suppose that it then became extinct . We forget how small the area of Europe is compared with the rest of the world ; nor have the sev- eral stages of the same formation throughout Europe been correlated with perfect accuracy . We may ...
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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