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 xxix
... follows from the high geometrical ratio of their increase , will be con- sidered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can ...
... follows from the high geometrical ratio of their increase , will be con- sidered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can ...
Página 184
... follow that the necessary parts should always vary in the right direction and to the right degree . With the different species of our domesticated animals we know that the parts vary in a different manner and degree ; and that some ...
... follow that the necessary parts should always vary in the right direction and to the right degree . With the different species of our domesticated animals we know that the parts vary in a different manner and degree ; and that some ...
Página 408
... follow from the following contingencies ; namely , from the young having to provide at a very early age for their own wants , and from their following the same habits of life with their parents ; for in this case , it would be ...
... follow from the following contingencies ; namely , from the young having to provide at a very early age for their own wants , and from their following the same habits of life with their parents ; for in this case , it would be ...
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