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 38
... never can be improved . ' On the other hand , nurserymeu , from raising large stocks of the same plants , are generally far more successful than amateurs in getting new and valuable varieties . The keeping of a large number of ...
... never can be improved . ' On the other hand , nurserymeu , from raising large stocks of the same plants , are generally far more successful than amateurs in getting new and valuable varieties . The keeping of a large number of ...
Página 42
... never have expected that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species ; I should have expected that changes of this nature could have been effected only ...
... never have expected that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species ; I should have expected that changes of this nature could have been effected only ...
Página 43
... never vary ; for these same authors practically rank that character as important ( as some few naturalists have honestly confessed ) which does not vary ; and , under this point of view , no instance of an important part varying will ...
... never vary ; for these same authors practically rank that character as important ( as some few naturalists have honestly confessed ) which does not vary ; and , under this point of view , no instance of an important part varying will ...
Página 60
... breed . In such cases the geometrical ratio of increase , the result of which never fails to be surprising , simply explains the extraordinarily rapid increase and wide diffusion of naturalised 60 ON THE ORIGIN OF SPECIES.
... breed . In such cases the geometrical ratio of increase , the result of which never fails to be surprising , simply explains the extraordinarily rapid increase and wide diffusion of naturalised 60 ON THE ORIGIN OF SPECIES.
Página 62
... never destroyed , and could be ensured to germinate in a fitting place . So that in all cases , the average number of any animal or plant depends only indirectly on the number of its eggs or seeds . In looking at Nature , it is most ...
... never destroyed , and could be ensured to germinate in a fitting place . So that in all cases , the average number of any animal or plant depends only indirectly on the number of its eggs or seeds . In looking at Nature , it is most ...
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