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 vi
... Affinity of the productions of the same continent - Centres of creation - Means of dispersal by changes of climate and of the level of the land , and by occasional means — Dispersal during the Glacial period -Alternate Glacial periods ...
... Affinity of the productions of the same continent - Centres of creation - Means of dispersal by changes of climate and of the level of the land , and by occasional means — Dispersal during the Glacial period -Alternate Glacial periods ...
Página 13
... affinity is meant , the general resemblance between species in structure and constitu- tion . Now the fertility of first crosses , and of the hybrids produced from them , is largely governed by their systematic affinity . This is ...
... affinity is meant , the general resemblance between species in structure and constitu- tion . Now the fertility of first crosses , and of the hybrids produced from them , is largely governed by their systematic affinity . This is ...
Página 14
... - ent of their systematic affinity , that is of any differ- ence in their structure or constitution , excepting in their reproductive systems . The diversity of the result in 14 LAWS GOVERNING THE STERILITY [ CHAP . IX .
... - ent of their systematic affinity , that is of any differ- ence in their structure or constitution , excepting in their reproductive systems . The diversity of the result in 14 LAWS GOVERNING THE STERILITY [ CHAP . IX .
Página 16
... affinity or degree of resemblance to each other . This latter statement is clearly proved by the differ- ence in the result of reciprocal crosses between the same two species , for , according as the one species or the other is used as ...
... affinity or degree of resemblance to each other . This latter statement is clearly proved by the differ- ence in the result of reciprocal crosses between the same two species , for , according as the one species or the other is used as ...
Página 18
... affinity , for no one has been able to graft together trees belonging to quite distinct families ; and , on the other hand , closely allied species , and varieties of the same species , can usually , but not invariably , be grafted with ...
... affinity , for no one has been able to graft together trees belonging to quite distinct families ; and , on the other hand , closely allied species , and varieties of the same species , can usually , but not invariably , be grafted with ...
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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