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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... intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number- On the lapse of time , as inferred from the rate of denudation and of deposition — On the lapse of time as estimated by years ...
... intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number- On the lapse of time , as inferred from the rate of denudation and of deposition — On the lapse of time as estimated by years ...
15 페이지
... intermediate character between their two parents , always closely resemble one of them ; and such hybrids , though externally so like one of their pure parent- species , are with rare exceptions extremely sterile . So again amongst ...
... intermediate character between their two parents , always closely resemble one of them ; and such hybrids , though externally so like one of their pure parent- species , are with rare exceptions extremely sterile . So again amongst ...
16 페이지
Charles Darwin. again amongst hybrids which are usually intermediate in structure between their parents , exceptional and abnormal individuals sometimes are born , which closely resemble one of their pure parents ; and these hybrids are ...
Charles Darwin. again amongst hybrids which are usually intermediate in structure between their parents , exceptional and abnormal individuals sometimes are born , which closely resemble one of their pure parents ; and these hybrids are ...
43 페이지
... intermediate in character , but closely resemble one of their parents ; but this does sometimes occur with hybrids , yet I grant much less frequently than with mongrels . Looking to the cases which I have collected of cross - bred ...
... intermediate in character , but closely resemble one of their parents ; but this does sometimes occur with hybrids , yet I grant much less frequently than with mongrels . Looking to the cases which I have collected of cross - bred ...
48 페이지
... intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number- On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by years ...
... intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number- On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by years ...
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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