On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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Página 4
... manner profit- able to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will ...
... manner profit- able to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will ...
Página 6
... manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection has been the main but not exclusive means of modification . CHAPTER I VARIATION UNDER ...
... manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection has been the main but not exclusive means of modification . CHAPTER I VARIATION UNDER ...
Página 10
... manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture , light , food , etc. , is most difficult : my impression is , that with animals such agencies have produced very ...
... manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture , light , food , etc. , is most difficult : my impression is , that with animals such agencies have produced very ...
Página 13
... manner as in the crossed offspring from a short - horned cow by a long - horned bull , the greater length of horn , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may ...
... manner as in the crossed offspring from a short - horned cow by a long - horned bull , the greater length of horn , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may ...
Página 15
... manner as , only in most cases in a lesser degree than , do closely - allied species of the same genus in a state of nature . I think this must be admitted , when we find that there are hardly any domestic races , either amongst animals ...
... manner as , only in most cases in a lesser degree than , do closely - allied species of the same genus in a state of nature . I think this must be admitted , when we find that there are hardly any domestic races , either amongst animals ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely