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 89
... genus large in grouping of all its own country ; these species are supposed to resemble each other in organic beings unequal degrees , as is so generally the case in nature , and as is represented in the diagram by the letters standing ...
... genus large in grouping of all its own country ; these species are supposed to resemble each other in organic beings unequal degrees , as is so generally the case in nature , and as is represented in the diagram by the letters standing ...
Página 94
... genus or a distinct genus . The six descendants from ( I ) will form two sub - genera or genera . But as the original species ( I ) differed largely from ( A ) , standing nearly at the extreme end of the original genus , the six ...
... genus or a distinct genus . The six descendants from ( I ) will form two sub - genera or genera . But as the original species ( I ) differed largely from ( A ) , standing nearly at the extreme end of the original genus , the six ...
Página 112
... genus ( Anophthalmus ) offers this remarkable peculiarity , that the species , as Mr. Murray observes , have not as ... genus to inhabit hot and cold countries , if it be true that all the species of the same genus are descended from a ...
... genus ( Anophthalmus ) offers this remarkable peculiarity , that the species , as Mr. Murray observes , have not as ... genus to inhabit hot and cold countries , if it be true that all the species of the same genus are descended from a ...
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