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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56개의 결과 중 1 - 5개
v 페이지
... any one formation - On the sudden appearance of groups of species -On their sudden appearance in the lowest known fossiliferous strata - Antiquity of the habitable earth V • 48 CHAPTER XI . ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS.
... any one formation - On the sudden appearance of groups of species -On their sudden appearance in the lowest known fossiliferous strata - Antiquity of the habitable earth V • 48 CHAPTER XI . ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS.
2 페이지
... known or believed to be descended from common parents , when crossed , and likewise the fertility of their mongrel off- spring , is , with reference to my theory , of equal im- portance with the sterility of species ; for it seems to ...
... known or believed to be descended from common parents , when crossed , and likewise the fertility of their mongrel off- spring , is , with reference to my theory , of equal im- portance with the sterility of species ; for it seems to ...
12 페이지
... known to be a sign of in- cipient fertilisation . From this extreme degree of sterility we have self - fertilised hybrids producing a greater and greater number of seeds up to perfect fer- tility . The hybrids raised from two species ...
... known to be a sign of in- cipient fertilisation . From this extreme degree of sterility we have self - fertilised hybrids producing a greater and greater number of seeds up to perfect fer- tility . The hybrids raised from two species ...
24 페이지
... known that hybrids raised from very distinct species are some- times weak and dwarfed , and perish at an early age ; of which fact Max Wichura has recently given some striking cases with hybrid willows . It may be here worth noticing ...
... known that hybrids raised from very distinct species are some- times weak and dwarfed , and perish at an early age ; of which fact Max Wichura has recently given some striking cases with hybrid willows . It may be here worth noticing ...
30 페이지
... known that if pollen of a distinct species be placed on the stigma of a flower , and its own pollen be afterwards , even after a considerable interval of time , placed on the same stigma , its action is so strongly prepotent that it ...
... known that if pollen of a distinct species be placed on the stigma of a flower , and its own pollen be afterwards , even after a considerable interval of time , placed on the same stigma , its action is so strongly prepotent that it ...
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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