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 |
Dentro del libro
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Página 57
... little more detail the struggle for existence . In my future work this subject shall be treated , as it well deserves , at much greater length . The elder de Candolle and Lyell have largely and philo- STRUGGLE FOR EXISTENCE 57.
... little more detail the struggle for existence . In my future work this subject shall be treated , as it well deserves , at much greater length . The elder de Candolle and Lyell have largely and philo- STRUGGLE FOR EXISTENCE 57.
Página 66
... greater , for six insectivorous birds were very common in the planta- tions , which were not to be seen on the heath ; and the heath was frequented by two or three distinct insectivorous birds . Here we see how potent has been the ...
... greater , for six insectivorous birds were very common in the planta- tions , which were not to be seen on the heath ; and the heath was frequented by two or three distinct insectivorous birds . Here we see how potent has been the ...
Página 67
... greater number in Paraguay of a certain fly , which lays its eggs in the navels of these animals when first born . The increase of these flies , numerous as they are , must be habitually checked by some means , probably by birds . Hence ...
... greater number in Paraguay of a certain fly , which lays its eggs in the navels of these animals when first born . The increase of these flies , numerous as they are , must be habitually checked by some means , probably by birds . Hence ...
Página 78
... greater difficulty in this being effected through 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 ...
... greater difficulty in this being effected through 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 ...
Página 101
... greater difference between species ? That this does habitually happen , we must infer from most of the innumerable species throughout nature presenting well - marked differ- ences ; whereas varieties , the supposed prototypes and ...
... greater difference between species ? That this does habitually happen , we must infer from most of the innumerable species throughout nature presenting well - marked differ- ences ; whereas varieties , the supposed prototypes and ...
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