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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... inherited at a correspond- ing age - RUDIMENTARY ORGANS ; their origin explained - Sum- mary . Page 202 CHAPTER XV . RECAPITULATION AND CONCLUSION . Recapitulation of the objections to the theory of Natural Selection -Recapitulation of ...
... inherited at a correspond- ing age - RUDIMENTARY ORGANS ; their origin explained - Sum- mary . Page 202 CHAPTER XV . RECAPITULATION AND CONCLUSION . Recapitulation of the objections to the theory of Natural Selection -Recapitulation of ...
Página 47
... inheritance of characters from both parent- forms . Finally , then , although we are as ignorant of the precise cause of the sterility of first crosses and of hybrids as we are why animals and plants removed from their natural ...
... inheritance of characters from both parent- forms . Finally , then , although we are as ignorant of the precise cause of the sterility of first crosses and of hybrids as we are why animals and plants removed from their natural ...
Página 92
... inherit different characters from their distinct progenitors ; and organ- isms already differing would vary in a different manner . For instance , it is possible , if all our fantail pigeons were destroyed , that fanciers might make a ...
... inherit different characters from their distinct progenitors ; and organ- isms already differing would vary in a different manner . For instance , it is possible , if all our fantail pigeons were destroyed , that fanciers might make a ...
Página 99
... inherited inferiority in common . But whether it be species be- longing to the same or to a distinct class , which have yielded their places to other modified and improved spe- cies , a few of the sufferers may often be preserved for a ...
... inherited inferiority in common . But whether it be species be- longing to the same or to a distinct class , which have yielded their places to other modified and improved spe- cies , a few of the sufferers may often be preserved for a ...
Página 104
... inheriting some inferiority in common ; and therefore , as new and improved groups spread throughout the world , old groups disappear from the world ; and the succession of forms everywhere tends to correspond both in their first ...
... inheriting some inferiority in common ; and therefore , as new and improved groups spread throughout the world , old groups disappear from the world ; and the succession of forms everywhere tends to correspond both in their first ...
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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