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 52
... geology plainly tells us that small genera have in the lapse of time often increased greatly in size ; and that large genera have often come to their maxima , declined , and disappeared . All that we want to show is , that where many ...
... geology plainly tells us that small genera have in the lapse of time often increased greatly in size ; and that large genera have often come to their maxima , declined , and disappeared . All that we want to show is , that where many ...
Página 76
... geological periods . Can we wonder then , that Nature's productions should be far ' truer in character than man's productions ; that they should be infinitely better adapted to the most complex condi- tions of life , and should plainly ...
... geological periods . Can we wonder then , that Nature's productions should be far ' truer in character than man's productions ; that they should be infinitely better adapted to the most complex condi- tions of life , and should plainly ...
Página 77
... geological ages , that we only see that the forms of life are now different from what they formerly were . Although natural selection can act only through and for the good of each being , yet characters and structures , which we are apt ...
... geological ages , that we only see that the forms of life are now different from what they formerly were . Although natural selection can act only through and for the good of each being , yet characters and structures , which we are apt ...
Página 86
... illustrative of geology ' ; but we now seldom hear the action , for instance , of the coast - waves , called a trifling and insignificant cause , when applied to the excavation of gigantic valleys or to 86 ON THE ORIGIN OF SPECIES.
... illustrative of geology ' ; but we now seldom hear the action , for instance , of the coast - waves , called a trifling and insignificant cause , when applied to the excavation of gigantic valleys or to 86 ON THE ORIGIN OF SPECIES.
Página 87
... geology has almost banished such views as the excavation of a great valley by a single diluvial wave , so will natural selection , if it be a true principle , banish the belief of the continued creation of new organic beings , or of any ...
... geology has almost banished such views as the excavation of a great valley by a single diluvial wave , so will natural selection , if it be a true principle , banish the belief of the continued creation of new organic beings , or of any ...
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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