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 138
... existing in lesser numbers would , as already remarked , run a greater chance of being exterminated than one existing in large numbers ; and in this particular case the intermediate form would be eminently liable to the inroads of ...
... existing in lesser numbers would , as already remarked , run a greater chance of being exterminated than one existing in large numbers ; and in this particular case the intermediate form would be eminently liable to the inroads of ...
Página 304
... existing horse , belonged to an extinct species . Had this horse been still living , but in some degree rare , no naturalist would have felt the least surprise at its rarity ; for rarity is the attribute of a vast number of species of ...
... existing horse , belonged to an extinct species . Had this horse been still living , but in some degree rare , no naturalist would have felt the least surprise at its rarity ; for rarity is the attribute of a vast number of species of ...
Página 311
... existing groups , or between them . That the extinct forms of life help to fill up the intervals between existing genera , families , and orders , is certainly true ; but as this statement has often been ignored or even denied , it may ...
... existing groups , or between them . That the extinct forms of life help to fill up the intervals between existing genera , families , and orders , is certainly true ; but as this statement has often been ignored or even denied , it may ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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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