The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432ÆäÀÌÁö |
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... common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera -Many of the species of the larger genera resemble varieties in being very closely , but unequally ...
... common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera -Many of the species of the larger genera resemble varieties in being very closely , but unequally ...
12 ÆäÀÌÁö
... common camel , prevented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated produc- tions , and belonging to equally diverse classes and countries , were taken from a state of ...
... common camel , prevented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated produc- tions , and belonging to equally diverse classes and countries , were taken from a state of ...
13 ÆäÀÌÁö
... common cattle , may , indeed , be looked upon as established by the admirable researches of Professor Rütimeyer . With respect to horses , from reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to ...
... common cattle , may , indeed , be looked upon as established by the admirable researches of Professor Rütimeyer . With respect to horses , from reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to ...
16 ÆäÀÌÁö
... common opinion of naturalists is correct , namely , that all are descended from the rock - pigeon ( Columba livia ) , including under this term several geographical races or sub - species , which differ from each other in the most ...
... common opinion of naturalists is correct , namely , that all are descended from the rock - pigeon ( Columba livia ) , including under this term several geographical races or sub - species , which differ from each other in the most ...
20 ÆäÀÌÁö
... common parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of ...
... common parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young