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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7 페이지
... similar experi- ments during many years , and always with the same result . These cases serve to show on what slight and mystericus causes the lesser or greater fertility of a species sometimes depends . The practical experiments of ...
... similar experi- ments during many years , and always with the same result . These cases serve to show on what slight and mystericus causes the lesser or greater fertility of a species sometimes depends . The practical experiments of ...
26 페이지
... similar 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 ...
... similar 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 ...
27 페이지
... similar parallelism holds good with an allied yet very different class of facts . It is an old and almost universal belief founded on a considerable body of evidence , which I have elsewhere given , that slight changes in the conditions ...
... similar parallelism holds good with an allied yet very different class of facts . It is an old and almost universal belief founded on a considerable body of evidence , which I have elsewhere given , that slight changes in the conditions ...
32 페이지
... similar cases occur with the illegitimate offspring of various dimorphic and trimorphic plants . Altogether there is the closest identity in character and behaviour between illegitimate plants and hybrids . It is hardly an exaggeration ...
... similar cases occur with the illegitimate offspring of various dimorphic and trimorphic plants . Altogether there is the closest identity in character and behaviour between illegitimate plants and hybrids . It is hardly an exaggeration ...
35 페이지
... similar differences in the case of varieties would be no sure guide . It is certain that with species the cause lies exclusively in differences in their sexual constitution . Now the varying conditions to which domesticated animals and ...
... similar differences in the case of varieties would be no sure guide . It is certain that with species the cause lies exclusively in differences in their sexual constitution . Now the varying conditions to which domesticated animals and ...
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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