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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91개의 결과 중 1 - 5개
vi 페이지
... species - On their different rates of change - Species once lost do not reappear— Groups of species follow the same general rules in their ap- pearance and disappearance as do single species - On extinction —On simultaneous changes in ...
... species - On their different rates of change - Species once lost do not reappear— Groups of species follow the same general rules in their ap- pearance and disappearance as do single species - On extinction —On simultaneous changes in ...
ix 페이지
... species , when intercrossed , have been specially en- dowed with sterility , in order to prevent their confusion . This view certainly seems at first highly probable , for species living together could hardly have been kept dis- tinct ...
... species , when intercrossed , have been specially en- dowed with sterility , in order to prevent their confusion . This view certainly seems at first highly probable , for species living together could hardly have been kept dis- tinct ...
2 페이지
... species . In treating this subject , two classes of facts , to a large extent fundamentally different , have generally been confounded ; namely , the sterility of species when first crossed , and the sterility of the hybrids produced ...
... species . In treating this subject , two classes of facts , to a large extent fundamentally different , have generally been confounded ; namely , the sterility of species when first crossed , and the sterility of the hybrids produced ...
4 페이지
... species are really so sterile , when intercrossed , as he be- lieved . It is certain , on the one hand , that the sterility of various species when crossed is so different in degree and graduates away so insensibly , and , on the other ...
... species are really so sterile , when intercrossed , as he be- lieved . It is certain , on the one hand , that the sterility of various species when crossed is so different in degree and graduates away so insensibly , and , on the other ...
7 페이지
... species , but not by pollen from the same plant , though this pollen can be proved to be perfectly sound by fertilising other plants or species . In the genus Hippeastrum , in Cory- dalis as shown by Professor Hildebrand , in various or ...
... species , but not by pollen from the same plant , though this pollen can be proved to be perfectly sound by fertilising other plants or species . In the genus Hippeastrum , in Cory- dalis as shown by Professor Hildebrand , in various or ...
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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