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 42
... species resemble varieties To test the truth of this anticipation I have arranged the plants of twelve countries , and the coleopterous insects of two districts , into two nearly equal masses , the species of the larger genera on one ...
... species resemble varieties To test the truth of this anticipation I have arranged the plants of twelve countries , and the coleopterous insects of two districts , into two nearly equal masses , the species of the larger genera on one ...
Página 43
... species of the larger genera resemble varieties , more than do the species of the smaller genera . Or the case may be put in another way , and it may be said , that in the larger genera , in which a number of varieties or incipient species ...
... species of the larger genera resemble varieties , more than do the species of the smaller genera . Or the case may be put in another way , and it may be said , that in the larger genera , in which a number of varieties or incipient species ...
Página 93
... species ( A ) , and the nearly extreme species ( I ) , as those which have largely varied , and have given rise to new varieties and species . The other nine species ( marked by capital letters ) of our original genus , may for long but ...
... species ( A ) , and the nearly extreme species ( I ) , as those which have largely varied , and have given rise to new varieties and species . The other nine species ( marked by capital letters ) of our original genus , may for long but ...
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