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 15
... genus , in several trifling respects , they often differ in an extreme degree in some one part , both when compared one with another , and more especially when compared with all the species in nature to which they are nearest allied ...
... genus , in several trifling respects , they often differ in an extreme degree in some one part , both when compared one with another , and more especially when compared with all the species in nature to which they are nearest allied ...
Página 17
... genus , which is distributed in a wild state throughout the world , that since man first appeared one single species alone should have been domesticated . In regard to sheep and goats I can form no opinion . I should think , from facts ...
... genus , which is distributed in a wild state throughout the world , that since man first appeared one single species alone should have been domesticated . In regard to sheep and goats I can form no opinion . I should think , from facts ...
Página 21
... genus ; more especially as in each of these breeds several truly- inherited sub - breeds , or species as he might have called them , could be shown him . Great as the differences are between the breeds of pigeons , I am fully convinced ...
... genus ; more especially as in each of these breeds several truly- inherited sub - breeds , or species as he might have called them , could be shown him . Great as the differences are between the breeds of pigeons , I am fully convinced ...
Página 50
... genus inhabiting any country , shows that there is something in the organic or inorganic conditions of that country favourable to the genus ; and , conse- quently , we might have expected to have found in the larger genera , or those ...
... genus inhabiting any country , shows that there is something in the organic or inorganic conditions of that country favourable to the genus ; and , conse- quently , we might have expected to have found in the larger genera , or those ...
Página 51
... genus ) have been formed , many varieties or incipient species ought , as a general rule , to be now forming . Where many large trees grow , we expect to find saplings . Where many species of a genus have been formed through variation ...
... genus ) have been formed , many varieties or incipient species ought , as a general rule , to be now forming . Where many large trees grow , we expect to find saplings . Where many species of a genus have been formed through variation ...
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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