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 xiii
... natural selection - The term used in a wide sense - Geometrical ratio of increase - Rapid increase of naturalised animals and plants - Nature of the checks to increase - Competition universal - Effects of climate - Protection from the ...
... natural selection - The term used in a wide sense - Geometrical ratio of increase - Rapid increase of naturalised animals and plants - Nature of the checks to increase - Competition universal - Effects of climate - Protection from the ...
Página 60
... Natural Selection , or the Survival of the Fittest . Variations neither useful nor injurious would not be affected by natural selection , and would be left either a fluctuating element , as perhaps we see in certain polymorphic species ...
... Natural Selection , or the Survival of the Fittest . Variations neither useful nor injurious would not be affected by natural selection , and would be left either a fluctuating element , as perhaps we see in certain polymorphic species ...
Página 65
... natural selection , than in the cotton - planter increasing and improving by selection the down in the pods on his cotton - trees . Natural selection may modify and adapt the larva of an insect to a score of contingencies , wholly ...
... natural selection , than in the cotton - planter increasing and improving by selection the down in the pods on his cotton - trees . Natural selection may modify and adapt the larva of an insect to a score of contingencies , wholly ...
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