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 3
... seems to me to be no explanation , for it leaves the case of the coadaptations of organic beings to each other and to their physical conditions of life , untouched and unexplained . ( It is , therefore , of the highest importance to ...
... seems to me to be no explanation , for it leaves the case of the coadaptations of organic beings to each other and to their physical conditions of life , untouched and unexplained . ( It is , therefore , of the highest importance to ...
Página 7
... seems pretty clear that organic beings must be exposed during several generations to the new conditions of life to cause any appreciable amount of variation ; and that when the organisation has once begun to vary , it generally ...
... seems pretty clear that organic beings must be exposed during several generations to the new conditions of life to cause any appreciable amount of variation ; and that when the organisation has once begun to vary , it generally ...
Página 11
... seems probable . There are many laws regulating variation , some few of which can be dimly seen , and will be hereafter briefly mentioned . I will here only allude to what may be called correlation of growth . Any change in the embryo ...
... seems probable . There are many laws regulating variation , some few of which can be dimly seen , and will be hereafter briefly mentioned . I will here only allude to what may be called correlation of growth . Any change in the embryo ...
Página 12
... seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure ...
... seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure ...
Página 14
... seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many generations , the several races , for instance , of the cabbage , in very poor soil ( in which case , however , some effect would ...
... seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many generations , the several races , for instance , of the cabbage , in very poor soil ( in which case , however , some effect would ...
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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