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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3 페이지
... species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . 74 CHAPTER III STRUGGLE FOR EXISTENCE Its bearing on natural selection ( 3 )
... species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . 74 CHAPTER III STRUGGLE FOR EXISTENCE Its bearing on natural selection ( 3 )
41 페이지
... closely allied species , we generally perceive in each do- mestic race , as already remarked , less uniformity of char- acter than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that ...
... closely allied species , we generally perceive in each do- mestic race , as already remarked , less uniformity of char- acter than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that ...
43 페이지
... closely allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
... closely allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
44 페이지
... closely resemble , or are identical with , those still existing . But this only throws far backward the history of civilization , and shows that animals were domesticated at a much earlier period than has hitherto been supposed . The ...
... closely resemble , or are identical with , those still existing . But this only throws far backward the history of civilization , and shows that animals were domesticated at a much earlier period than has hitherto been supposed . The ...
46 페이지
... closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug - dog , or Blenheim spaniel , etc. - so unlike all wild Canidæ - ever existed in a state of nature ? It has often been loosely said that all our races of ...
... closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug - dog , or Blenheim spaniel , etc. - so unlike all wild Canidæ - ever existed in a state of nature ? It has often been loosely said that all our races of ...
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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