On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1860 - 502페이지 This is the 'second edition' of Darwin's Origin of Species. |
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xii 페이지
... descendants from a common parent― Explains the Grouping of all organic beings 80-130 CHAPTER V. LAWS OF VARIATION . - Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision ...
... descendants from a common parent― Explains the Grouping of all organic beings 80-130 CHAPTER V. LAWS OF VARIATION . - Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision ...
6 페이지
... descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am con- vinced that Natural Selection has been the main ...
... descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am con- vinced that Natural Selection has been the main ...
16 페이지
... descendants of aboriginally distinct species . If any marked distinction existed between domestic races and species , this source of doubt could not so perpetu- ally recur . It has often been stated that domestic races do not differ ...
... descendants of aboriginally distinct species . If any marked distinction existed between domestic races and species , this source of doubt could not so perpetu- ally recur . It has often been stated that domestic races do not differ ...
29 페이지
... descendants of other species ? Selection . - Let us now briefly consider the steps by which domestic races have been produced , either from one or from several allied species . Some little effect may , perhaps , be attributed to the ...
... descendants of other species ? Selection . - Let us now briefly consider the steps by which domestic races have been produced , either from one or from several allied species . Some little effect may , perhaps , be attributed to the ...
39 페이지
... descendants of that pigeon would become through long - continued , partly unconscious and partly methodical selection . Per- haps the parent bird of all fantails had only fourteen tail- feathers somewhat expanded , like the present Java ...
... descendants of that pigeon would become through long - continued , partly unconscious and partly methodical selection . Per- haps the parent bird of all fantails had only fourteen tail- feathers somewhat expanded , like the present Java ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap 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 intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely