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 13
... inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in the silkworm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some ...
... inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in the silkworm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some ...
Página 18
... inherited varia- tion . Who can believe that animals closely resembling the Italian greyhound , the bloodhound , the bull - dog , or Blenheim spaniel , etc. - so unlike all wild Canida —ever existed freely in a state of nature ? It has ...
... inherited varia- tion . Who can believe that animals closely resembling the Italian greyhound , the bloodhound , the bull - dog , or Blenheim spaniel , etc. - so unlike all wild Canida —ever existed freely in a state of nature ? It has ...
Página 20
... inherited habit of flying at a great height in a compact flock , and tumbling in the air head over heels . The runt is a bird of great size , with long , massive beak and large feet ; some of the sub - breeds of runts have very long ...
... inherited habit of flying at a great height in a compact flock , and tumbling in the air head over heels . The runt is a bird of great size , with long , massive beak and large feet ; some of the sub - breeds of runts have very long ...
Página 21
... 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 that the common opinion of naturalists is correct , namely , that ...
... 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 that the common opinion of naturalists is correct , namely , that ...
Página 24
... inheritance . Lastly , the hybrids or mongrels from between all the domestic breeds of pigeons are perfectly fertile . I can state this from my own observations , purposely made , on the most distinct breeds . Now , it is difficult ...
... inheritance . Lastly , the hybrids or mongrels from between all the domestic breeds of pigeons are perfectly fertile . I can state this from my own observations , purposely made , on the most distinct breeds . Now , it is difficult ...
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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