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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viii 페이지
... groups of species On their sudden appearance in the lowest known fossiliferous strata ― - Page 279-311 CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS . - - On the slow and successive appearance of new species - On their ...
... groups of species On their sudden appearance in the lowest known fossiliferous strata ― - Page 279-311 CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS . - - On the slow and successive appearance of new species - On their ...
ix 페이지
... groups subordinate to groups - Natural system - Rules and difficulties in classification , explained on the theory of descent with modification Classification of varieties - Descent always used in classification - Analogical or adaptive ...
... groups subordinate to groups - Natural system - Rules and difficulties in classification , explained on the theory of descent with modification Classification of varieties - Descent always used in classification - Analogical or adaptive ...
28 페이지
... groups of birds , in nature . One circumstance has struck me much ; namely , that all the breeders of the various domestic animals and the cultivators of plants , with whom I have ever conversed , or whose treatises I have read , are ...
... groups of birds , in nature . One circumstance has struck me much ; namely , that all the breeders of the various domestic animals and the cultivators of plants , with whom I have ever conversed , or whose treatises I have read , are ...
48 페이지
... islets of the little Madeira group there are many insects which are characterized as varieties in Mr. Wollaston's admirable work , but which it cannot be doubted would be ranked as distinct species by many 48 CHAP . II . DOUBTFUL SPECIES .
... islets of the little Madeira group there are many insects which are characterized as varieties in Mr. Wollaston's admirable work , but which it cannot be doubted would be ranked as distinct species by many 48 CHAP . II . DOUBTFUL SPECIES .
50 페이지
... group of organisms quite unknown to him , he is at first much perplexed to determine what differences to consider as specific , and what as varieties ; for he knows nothing of the amount and kind of variation to which the group is ...
... group of organisms quite unknown to him , he is at first much perplexed to determine what differences to consider as specific , and what as varieties ; for he knows nothing of the amount and kind of variation to which the group is ...
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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