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 72
... certain circumstances individual differences in the curvature or length of the proboscis , & c . , too slight to be appreciated by us , might profit a bee or other insect , so that certain individuals would be able to obtain their food ...
... certain circumstances individual differences in the curvature or length of the proboscis , & c . , too slight to be appreciated by us , might profit a bee or other insect , so that certain individuals would be able to obtain their food ...
Página 264
... certain South American indigenous domestic dogs do not readily unite with European dogs , the explanation which will occur to every one , and probably the true one , is that they are descended from aboriginally distinct species ...
... certain South American indigenous domestic dogs do not readily unite with European dogs , the explanation which will occur to every one , and probably the true one , is that they are descended from aboriginally distinct species ...
Página 401
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. certain amount of change ; and in this case we see the act of meta- morphosis performed in a primary and gradual manner . Many insects , and especially certain ...
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. certain amount of change ; and in this case we see the act of meta- morphosis performed in a primary and gradual manner . Many insects , and especially certain ...
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