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 12
... laws governing inheritance are quite unknown ; no one can say why a peculiarity in different individuals of the same species , or in individuals of different species , is sometimes inherited and sometimes not so ; why the child often ...
... laws governing inheritance are quite unknown ; no one can say why a peculiarity in different individuals of the same species , or in individuals of different species , is sometimes inherited and sometimes not so ; why the child often ...
Página 13
... laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to its primary cause , which may have acted on the ovules or male element ; in nearly the same manner as in the crossed ...
... laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to its primary cause , which may have acted on the ovules or male element ; in nearly the same manner as in the crossed ...
Página 27
... laws of inheritance than does the breeder , and knowing no more than he does of the intermediate links in the long lines of descent , yet admit that many of our domestic races have descended from the same parents - may they not learn a ...
... laws of inheritance than does the breeder , and knowing no more than he does of the intermediate links in the long lines of descent , yet admit that many of our domestic races have descended from the same parents - may they not learn a ...
Página 31
... laws of correlation of growth , the importance of which should never be overlooked , will ensure some differences ; but , as a general rule , I cannot doubt that the continued selection of slight variations , either in the leaves , the ...
... laws of correlation of growth , the importance of which should never be overlooked , will ensure some differences ; but , as a general rule , I cannot doubt that the continued selection of slight variations , either in the leaves , the ...
Página 39
... laws , more especially by that of cor- relation of growth . Something may be attributed to the direct action of the conditions of life . Something must be attributed to use and disuse . The final result is thus rendered infinitely ...
... laws , more especially by that of cor- relation of growth . Something may be attributed to the direct action of the conditions of life . Something must be attributed to use and disuse . The final result is thus rendered infinitely ...
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