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 4
... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be compelled ...
... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be compelled ...
Página 13
... importance to us , that peculiarities appear- ing in the males of our domestic breeds are often trans- mitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted ...
... importance to us , that peculiarities appear- ing in the males of our domestic breeds are often trans- mitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted ...
Página 19
... important , as being of considerable antiquity . I have associated with several eminent fanciers , and have been permitted to join two of the London Pigeon Clubs . The diversity of the breeds is something astonishing . Compare the ...
... important , as being of considerable antiquity . I have associated with several eminent fanciers , and have been permitted to join two of the London Pigeon Clubs . The diversity of the breeds is something astonishing . Compare the ...
Página 29
... importance of the principle of selection in regard to merino sheep is so fully recognised , that men follow it as a trade : the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at ...
... importance of the principle of selection in regard to merino sheep is so fully recognised , that men follow it as a trade : the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at ...
Página 31
... importance of which should never be overlooked , will ensure some differences ; but , as a general rule , I cannot ... important . But it is very far from true that the principle is a modern discovery . I could give several references ...
... importance of which should never be overlooked , will ensure some differences ; but , as a general rule , I cannot ... important . But it is very far from true that the principle is a modern discovery . I could give several references ...
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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