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
... structure , for instance , of the woodpecker , with its feet , tail , beak , and tongue , so admirably adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees ...
... structure , for instance , of the woodpecker , with its feet , tail , beak , and tongue , so admirably adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees ...
Página 11
... structure , owing to the mysterious laws of the correlation of growth . The result of the various , quite unknown , or dimly seen laws of variation is infinitely complex and diversified . It is well worth while carefully to study the ...
... structure , owing to the mysterious laws of the correlation of growth . The result of the various , quite unknown , or dimly seen laws of variation is infinitely complex and diversified . It is well worth while carefully to study the ...
Página 12
... structure and constitution in which the varieties and sub - varieties differ slightly from each other . The whole organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any ...
... structure and constitution in which the varieties and sub - varieties differ slightly from each other . The whole organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . Any ...
Página 14
... structure , in such case , I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view : to assert that we could not breed our cart and race horses ...
... structure , in such case , I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view : to assert that we could not breed our cart and race horses ...
Página 21
... structure which are variable . The period at which the perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of ...
... structure which are variable . The period at which the perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of ...
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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