On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 67
... appearing in any formation , the probabil- ity is that it only then first immigrated into that area . It is well - known , for instance , that several species ap- pear somewhat earlier in the palæozoic beds of North America than in ...
... appearing in any formation , the probabil- ity is that it only then first immigrated into that area . It is well - known , for instance , that several species ap- pear somewhat earlier in the palæozoic beds of North America than in ...
Página 68
... appear and disappear at different levels , ow- ing to the migrations of species and to geographical changes . And in the distant future , a geologist , ex- amining these beds , would be tempted to conclude that the average duration of ...
... appear and disappear at different levels , ow- ing to the migrations of species and to geographical changes . And in the distant future , a geologist , ex- amining these beds , would be tempted to conclude that the average duration of ...
Página 75
... appear as so many new , though closely allied species . It is also probable that each great period of subsidence would be interrupted by os- cillations of level , and that slight climatal changes would intervene during such lengthy ...
... appear as so many new , though closely allied species . It is also probable that each great period of subsidence would be interrupted by os- cillations of level , and that slight climatal changes would intervene during such lengthy ...
Página 77
... appear in certain formations , has been urged by several paleontologists - for instance , by Agas- siz , Pictet , and Sedgwick - as a fatal objection to the be- lief in the transmutation of species . If numerous spe- cies , belonging to ...
... appear in certain formations , has been urged by several paleontologists - for instance , by Agas- siz , Pictet , and Sedgwick - as a fatal objection to the be- lief in the transmutation of species . If numerous spe- cies , belonging to ...
Página 78
... appear as if suddenly created . I may here recall a remark formerly made , namely , that it might require a long succession of ages to adapt an organism to some new and peculiar line of life , for instance , to fly through the air ; and ...
... appear as if suddenly created . I may here recall a remark formerly made , namely , that it might require a long succession of ages to adapt an organism to some new and peculiar line of life , for instance , to fly through the air ; and ...
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Términos y frases comunes
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