On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 33
... archipelago , regularly appear under two or even three conspicuously distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian ...
... archipelago , regularly appear under two or even three conspicuously distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian ...
Página 366
... Archipelago , situated under the equator , lies at the distance of between 500 and 600 miles from the shores of South America . Here almost every product of the land and of the water bears the unmistakable stamp of the American ...
... Archipelago , situated under the equator , lies at the distance of between 500 and 600 miles from the shores of South America . Here almost every product of the land and of the water bears the unmistakable stamp of the American ...
Página 369
... Archipelago , and in a lesser degree in some analogous cases , is that each new species after being formed in any one island , did not spread quickly to the other islands . But the islands , though in sight of each other , are separated ...
... Archipelago , and in a lesser degree in some analogous cases , is that each new species after being formed in any one island , did not spread quickly to the other islands . But the islands , though in sight of each other , are separated ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young