The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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13 페이지
... remarked ( " Goethe als Naturforscher , " von Dr. Karl Meding , s . 34 ) that the future ques- tion for naturalists will be how , for instance , cattle got their horns , and not for what they are used . It is rather a singular instance ...
... remarked ( " Goethe als Naturforscher , " von Dr. Karl Meding , s . 34 ) that the future ques- tion for naturalists will be how , for instance , cattle got their horns , and not for what they are used . It is rather a singular instance ...
14 페이지
... remarking that negroes and mulattoes enjoy an immunity from certain tropical dis- eases , he observes , first , that all animals tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by ...
... remarking that negroes and mulattoes enjoy an immunity from certain tropical dis- eases , he observes , first , that all animals tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by ...
34 페이지
... remarked , between the variability which follows from the crossing of distinct species , and that which may be ob served with plants and animals when reared under new or unnatural conditions . Many facts clearly show how eminently ...
... remarked , between the variability which follows from the crossing of distinct species , and that which may be ob served with plants and animals when reared under new or unnatural conditions . Many facts clearly show how eminently ...
41 페이지
... remarked , less uniformity of char- acter than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other spe VARIATION UNDER DOMESTICATION 41.
... remarked , less uniformity of char- acter than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other spe VARIATION UNDER DOMESTICATION 41.
44 페이지
... remarked , that they had at this early age progressed considerably in civilization ; and this again implies a long continued previous period of less ad- vanced civilization , during which the domesticated ani- mals , kept by different ...
... remarked , that they had at this early age progressed considerably in civilization ; and this again implies a long continued previous period of less ad- vanced civilization , during which the domesticated ani- mals , kept by different ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young