The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 120
... embryo almost unaltered , continually adds , in the course of successive generations , more and more difference to the adult . Thus the embryo comes to be left as a sort of picture , preserved by nature , of the former and less modified ...
... embryo almost unaltered , continually adds , in the course of successive generations , more and more difference to the adult . Thus the embryo comes to be left as a sort of picture , preserved by nature , of the former and less modified ...
Página 128
... embryos of the more re- cent animals belonging to the same classes , and this wonderful fact receives a simple explanation according to our views . The succession of the same types of structure within the same areas during the later ...
... embryos of the more re- cent animals belonging to the same classes , and this wonderful fact receives a simple explanation according to our views . The succession of the same types of structure within the same areas during the later ...
Página 206
... embryo , are of paramount importance ! So again in formerly discussing certain morphological characters which are not functionally important , we have seen that they are often of the highest service in classification . This depends on ...
... embryo , are of paramount importance ! So again in formerly discussing certain morphological characters which are not functionally important , we have seen that they are often of the highest service in classification . This depends on ...
Página 211
... embryo , —on the number and position of the cotyledons , and on the mode of development of the plumule and radicle . We shall immediately see why these characters possess so high a value in classification , namely , from the natural ...
... embryo , —on the number and position of the cotyledons , and on the mode of development of the plumule and radicle . We shall immediately see why these characters possess so high a value in classification , namely , from the natural ...
Página 240
... embryos of the most distinct species belonging to the same class are closely similar , but become , when fully developed , widely dissimilar . A better proof of this latter fact 66 66 cannot be given than the statement by Von 240 ...
... embryos of the most distinct species belonging to the same class are closely similar , but become , when fully developed , widely dissimilar . A better proof of this latter fact 66 66 cannot be given than the statement by Von 240 ...
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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