The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1896 |
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8 페이지
... habit , " reproduces itself as perfectly as if it had been a natural species from the mountains of Chili . " I have taken some pains to ascertain the degree of fertility of some of the complex crosses of Rhododendrons , and I am assured ...
... habit , " reproduces itself as perfectly as if it had been a natural species from the mountains of Chili . " I have taken some pains to ascertain the degree of fertility of some of the complex crosses of Rhododendrons , and I am assured ...
10 페이지
... their important osteo- logical differences , as well as from those by Mr. Blyth on their differences in habits , voice , constitution , & c . , these two forms must be regarded as good and distinct 10 [ CHAP . IX . HYBRIDISM.
... their important osteo- logical differences , as well as from those by Mr. Blyth on their differences in habits , voice , constitution , & c . , these two forms must be regarded as good and distinct 10 [ CHAP . IX . HYBRIDISM.
14 페이지
... habit and general appearance , and having strongly marked differ- ences in every part of the flower , even in the pollen , in the fruit , and in the cotyledons , can be crossed . Annual and perennial plants , deciduous and evergreen ...
... habit and general appearance , and having strongly marked differ- ences in every part of the flower , even in the pollen , in the fruit , and in the cotyledons , can be crossed . Annual and perennial plants , deciduous and evergreen ...
27 페이지
... habits of life . Again , both with plants and animals , there is the clearest evidence that a cross between individuals of the same species , which differ to a certain extent , gives vigour and fertility to the offspring ; and that ...
... habits of life . Again , both with plants and animals , there is the clearest evidence that a cross between individuals of the same species , which differ to a certain extent , gives vigour and fertility to the offspring ; and that ...
133 페이지
Charles Darwin. see the agouti and bizcacha , animals having nearly the same habits as our hares and rabbits , and belonging to the same order of Rodents , but they plainly display an American type of structure . We ascend the lofty ...
Charles Darwin. see the agouti and bizcacha , animals having nearly the same habits as our hares and rabbits , and belonging to the same order of Rodents , but they plainly display an American type of structure . We ascend the lofty ...
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accumulated adapted admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo 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 mammæ mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists paleozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings