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 41
... vary most - Species of the larger genera in any country vary more than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and ...
... vary most - Species of the larger genera in any country vary more than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and ...
Página 42
... vary in the individuals of the same species . I am convinced that the most experienced naturalist would be surprised at the number of the cases of variability , even in important parts of structure , which he could collect on good ...
... vary in the individuals of the same species . I am convinced that the most experienced naturalist would be surprised at the number of the cases of variability , even in important parts of structure , which he could collect on good ...
Página 43
... 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 ever be ...
... 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 ever be ...
Página 49
... vary most , by tabulating all the varieties in several well- worked floras . At first this seemed a simple task ... varying species . Dr. Hooker permits me to add , that after having carefully read my manuscript , and examined the tables ...
... vary most , by tabulating all the varieties in several well- worked floras . At first this seemed a simple task ... varying species . Dr. Hooker permits me to add , that after having carefully read my manuscript , and examined the tables ...
Página 52
... varying much , and are thus increasing in the number of their species , or that no small genera are now varying and increasing ; for if this had been so , it would have been fatal to my theory ; inasmuch as geology plainly tells us that ...
... varying much , and are thus increasing in the number of their species , or that no small genera are now varying and increasing ; for if this had been so , it would have been fatal to my theory ; inasmuch as geology plainly tells us that ...
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