The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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... closely , but unequally , related to each other , and in having restricted ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural selection - The term used in a wide sense- e - Geometrical ratio of increase - Rapid ...
... closely , but unequally , related to each other , and in having restricted ranges 30 CHAPTER III . STRUGGLE FOR EXISTENCE . Its bearing on natural selection - The term used in a wide sense- e - Geometrical ratio of increase - Rapid ...
11 페이지
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character 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 domestic race , as already remarked , less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that ...
12 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 ...
14 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 ...
18 페이지
... closely related to each other . But to extend it so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , would be rash in ...
... closely related to each other . But to extend it so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , would be rash in ...
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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 fact 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 lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally 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