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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49 페이지
... progenitor ; and the progenitor will gen- erally have differed in some respects from all its modi- fied descendants . To give a simple illustration : the fantail and pouter pigeons are both descended from the rock - pigeon ; if we ...
... progenitor ; and the progenitor will gen- erally have differed in some respects from all its modi- fied descendants . To give a simple illustration : the fantail and pouter pigeons are both descended from the rock - pigeon ; if we ...
70 페이지
... as before explained , that A might be the actual progenitor of B and C , and yet would not necessarily be strictly intermediate between them in all respects . So that we might obtain 70 ABSENCE OF INTERMEDIATE VARIETIES [ CHAP . X.
... as before explained , that A might be the actual progenitor of B and C , and yet would not necessarily be strictly intermediate between them in all respects . So that we might obtain 70 ABSENCE OF INTERMEDIATE VARIETIES [ CHAP . X.
77 페이지
... progenitor , must have been an extremely slow process ; and the progeni- tors must have lived long before their modified descen- dants . But we continually overrate the perfection of the geological record , and falsely infer , because ...
... progenitor , must have been an extremely slow process ; and the progeni- tors must have lived long before their modified descen- dants . But we continually overrate the perfection of the geological record , and falsely infer , because ...
82 페이지
... progenitor , apply with equal force to the earliest known species . For in- stance , it cannot be doubted that all the Cambrian and Silurian trilobites are descended from some one crusta- cean , 82 [ CHAP . X. GROUPS OF ALLIED SPECIES.
... progenitor , apply with equal force to the earliest known species . For in- stance , it cannot be doubted that all the Cambrian and Silurian trilobites are descended from some one crusta- cean , 82 [ CHAP . X. GROUPS OF ALLIED SPECIES.
83 페이지
... progenitors of all the species belonging to the same groups which have sub- sequently appeared , for they are not in any degree in- termediate in character . Consequently , if the theory be true , it is indisputable that before the ...
... progenitors of all the species belonging to the same groups which have sub- sequently appeared , for they are not in any degree in- termediate in character . Consequently , if the theory be true , it is indisputable that before the ...
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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