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 112
... families . Thus it is , as I believe , that two or more genera are produced by descent with modification , from two or more species of the same genus . And the two or more parent - species are supposed to have descended from some one ...
... families . Thus it is , as I believe , that two or more genera are produced by descent with modification , from two or more species of the same genus . And the two or more parent - species are supposed to have descended from some one ...
Página 113
... families , or even orders , according to the amount of divergent modification supposed to be represented in the diagram . And the two new families , or orders , will have descended from two species of the original genus ; and these two ...
... families , or even orders , according to the amount of divergent modification supposed to be represented in the diagram . And the two new families , or orders , will have descended from two species of the original genus ; and these two ...
Página 115
... families , orders , and classes , as at the present day . Summary of Chapter . — If during the long course of ages and under varying conditions of life , organic beings vary at all in the several parts of their organisa- tion , and I ...
... families , orders , and classes , as at the present day . Summary of Chapter . — If during the long course of ages and under varying conditions of life , organic beings vary at all in the several parts of their organisa- tion , and I ...
Página 116
... families , families , orders , sub - classes , and classes . The several subordinate groups in any class cannot 116 ON THE ORIGIN OF SPECIES.
... families , families , orders , sub - classes , and classes . The several subordinate groups in any class cannot 116 ON THE ORIGIN OF SPECIES.
Página 117
... families , and genera which have now no living representatives , and which are known to us only from having been found in a fossil state . As we here and there see a thin strag- gling branch springing from a fork low down in a tree ...
... families , and genera which have now no living representatives , and which are known to us only from having been found in a fossil state . As we here and there see a thin strag- gling branch springing from a fork low down in a tree ...
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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