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
... 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 tend to propagate its new and modified form . This ...
... 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 tend to propagate its new and modified form . This ...
Página 9
... sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , etc. , and sometimes by seed . These ' sports ' are extremely rare under nature , but far from rare under cultivation ...
... sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , etc. , and sometimes by seed . These ' sports ' are extremely rare under nature , but far from rare under cultivation ...
Página 10
... sometimes differ considerably from each other , though both the young and the parents , as Müller has remarked , have apparently been exposed to exactly the same conditions of life ; and this shows how unim- portant the direct effects ...
... sometimes differ considerably from each other , though both the young and the parents , as Müller has remarked , have apparently been exposed to exactly the same conditions of life ; and this shows how unim- portant the direct effects ...
Página 12
... sometimes inherited and sometimes not so ; why the child often reverts in certain characters to its grandfather or grandmother or other more remote In ancestor ; why a peculiarity is often transmitted from 12 ON THE ORIGIN OF SPECIES.
... sometimes inherited and sometimes not so ; why the child often reverts in certain characters to its grandfather or grandmother or other more remote In ancestor ; why a peculiarity is often transmitted from 12 ON THE ORIGIN OF SPECIES.
Página 13
... sometimes earlier . many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in the silkworm are known to appear at the ...
... sometimes earlier . many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in the silkworm are known to appear at the ...
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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