The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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... ancient forms- On the succession of the same types within the same areas- Summary of preceding and present chapter Page 89 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . Present distribution cannot be accounted for by differences in physical ...
... ancient forms- On the succession of the same types within the same areas- Summary of preceding and present chapter Page 89 CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . Present distribution cannot be accounted for by differences in physical ...
Página 51
... ancient forms ; and so on backwards , always converging to the common ancestor of each great class . So that the number of intermediate and transitional links , between all living and extinct spe- cies , must have been inconceivably ...
... ancient forms ; and so on backwards , always converging to the common ancestor of each great class . So that the number of intermediate and transitional links , between all living and extinct spe- cies , must have been inconceivably ...
Página 53
... ancient sea- coasts , cannot have been thus formed , for each line is composed of one and the same formation , whilst our sea - cliffs are everywhere formed by the intersection of various formations . This being the case , we are ...
... ancient sea- coasts , cannot have been thus formed , for each line is composed of one and the same formation , whilst our sea - cliffs are everywhere formed by the intersection of various formations . This being the case , we are ...
Página 62
... ancient forma- tions , which are throughout the greater part of their thickness rich in fossils , have thus been formed during subsidence . Since publishing my views on this subject in 1845 , I have watched the progress of Geology , and ...
... ancient forma- tions , which are throughout the greater part of their thickness rich in fossils , have thus been formed during subsidence . Since publishing my views on this subject in 1845 , I have watched the progress of Geology , and ...
Página 76
... ancient homes , as they would differ from their former state in a nearly uniform , though perhaps extremely slight degree , and as they would be found embedded in slightly different sub - stages of the same formation , they would ...
... ancient homes , as they would differ from their former state in a nearly uniform , though perhaps extremely slight degree , and as they would be found embedded in slightly different sub - stages of the same formation , they would ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied 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 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 palæontologists Palæozoic 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 stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings