On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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74개의 결과 중 1 - 5개
viii 페이지
... groups of species - On their sudden appearance in the lowest known fossiliferous strata Antiquity of the habitable earth .. 345-384 - CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS . On the slow and successive appearance of ...
... groups of species - On their sudden appearance in the lowest known fossiliferous strata Antiquity of the habitable earth .. 345-384 - CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS . On the slow and successive appearance of ...
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 ...
xvi 페이지
... groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing forms ...
... groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing forms ...
31 페이지
... groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed , or whose treatises I have read , are ...
... groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed , or whose treatises I have read , are ...
61 페이지
... group is subject ; and this shows , at least , how very generally there is some variation . But if he confine his attention to ... groups and in other countries , by which to correct his first impressions . As he extends the range of his ...
... group is subject ; and this shows , at least , how very generally there is some variation . But if he confine his attention to ... groups and in other countries , by which to correct his first impressions . As he extends the range of his ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely