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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... manner the species of Pelargonium , Fuchsia , Calceolaria , Petunia , Rhododendron , & c . , have been crossed , yet many of these hybrids seed freely . For instance , Herbert asserts that a hybrid from Calceolaria integrifolia and ...
... manner the species of Pelargonium , Fuchsia , Calceolaria , Petunia , Rhododendron , & c . , have been crossed , yet many of these hybrids seed freely . For instance , Herbert asserts that a hybrid from Calceolaria integrifolia and ...
24 페이지
... manner ; at least it is known that hybrids raised from very distinct species are sometimes 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 ...
... manner ; at least it is known that hybrids raised from very distinct species are sometimes 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 ...
26 페이지
... manner . In the one case , the conditions of life have been dis- turbed , though often in so slight a degree as to be in- appreciable by us ; in the other case , or that of hybrids , the external conditions have remained the same , but ...
... manner . In the one case , the conditions of life have been dis- turbed , though often in so slight a degree as to be in- appreciable by us ; in the other case , or that of hybrids , the external conditions have remained the same , but ...
30 페이지
... manner as occurs in crossing distinct species . As the degree of sterility in the latter case depends in an eminent degree on the con- ditions of life being more or less favourable , so I have found it with illegitimate unions . It is ...
... manner as occurs in crossing distinct species . As the degree of sterility in the latter case depends in an eminent degree on the con- ditions of life being more or less favourable , so I have found it with illegitimate unions . It is ...
31 페이지
... manner as do two distinct species when crossed . This led me carefully to observe during four years many seedlings , raised from several illegitimate unions . The chief result is that these illegitimate plants , as they may be called ...
... manner as do two distinct species when crossed . This led me carefully to observe during four years many seedlings , raised from several illegitimate unions . The chief result is that these illegitimate plants , as they may be called ...
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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