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
... parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which VARIATION UNDER DOMESTICATION 15.
... parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which VARIATION UNDER DOMESTICATION 15.
Página 16
... parent species of our existing domesticated pro- ductions have varied . In the case of most of our anciently domesticated animals and plants , I do not think it is possible to come to any definite conclusion , whether they have ...
... parent species of our existing domesticated pro- ductions have varied . In the case of most of our anciently domesticated animals and plants , I do not think it is possible to come to any definite conclusion , whether they have ...
Página 17
... parent . With respect to horses , from reasons which I cannot give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from ...
... parent . With respect to horses , from reasons which I cannot give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended from one wild stock . Mr. Blyth , whose opinion , from ...
Página 18
... parent - stocks ? So it is in India . Even in the case of the domestic dogs of the whole world , which I fully admit ... parents ; and if we account for our several domestic races by this process , we must admit the former existence of ...
... parent - stocks ? So it is in India . Even in the case of the domestic dogs of the whole world , which I fully admit ... parents ; and if we account for our several domestic races by this process , we must admit the former existence of ...
Página 22
... parent - stocks possessed the characteristic enor- mous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub ...
... parent - stocks possessed the characteristic enor- mous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub ...
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