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 37
... improved individuals slowly spread in the immediate neighbourhood . But as yet they will hardly have a distinct name , and from being only slightly valued , their history will be disregarded . When further improved by the same slow and ...
... improved individuals slowly spread in the immediate neighbourhood . But as yet they will hardly have a distinct name , and from being only slightly valued , their history will be disregarded . When further improved by the same slow and ...
Página 38
... improved . ' On the other hand , nurserymeu , from raising large stocks of the same plants , are generally far more successful than amateurs in getting new and valuable varieties . The keeping of a large number of individuals of a ...
... improved . ' On the other hand , nurserymeu , from raising large stocks of the same plants , are generally far more successful than amateurs in getting new and valuable varieties . The keeping of a large number of individuals of a ...
Página 75
... improving some of the varying inhabitants . as all the inhabitants of each country are struggling together with ... improved ; for in all countries , the natives have been so far conquered by naturalised productions , that they have ...
... improving some of the varying inhabitants . as all the inhabitants of each country are struggling together with ... improved ; for in all countries , the natives have been so far conquered by naturalised productions , that they have ...
Página 78
... improving by selection the down in the pods on his cotton - trees . Natural selection may modify and adapt the larva of an insect to a score of contingencies , wholly different from those which concern the mature insect . These ...
... improving by selection the down in the pods on his cotton - trees . Natural selection may modify and adapt the larva of an insect to a score of contingencies , wholly different from those which concern the mature insect . These ...
Página 93
... improved in a corresponding degree with its com- petitors , it will soon be exterminated . In man's methodical selection , a breeder selects for some definite object , and free intercrossing will wholly stop his work . But when many men ...
... improved in a corresponding degree with its com- petitors , it will soon be exterminated . In man's methodical selection , a breeder selects for some definite object , and free intercrossing will wholly stop his work . But when many men ...
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