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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... smaller genera Many of the species of the larger genera resemble varieties in being very closely , but un- equally , related to each other , and in having restricted ranges 48-70 CHAPTER III . STRUGGLE FOR EXISTENCE . ― Its bearing.
... smaller genera Many of the species of the larger genera resemble varieties in being very closely , but un- equally , related to each other , and in having restricted ranges 48-70 CHAPTER III . STRUGGLE FOR EXISTENCE . ― Its bearing.
17 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 ...
19 페이지
... closely resemble or are even identical with those still existing . But this only throws far backwards the history of civi- lization , and shows that animals were domesticated at a much earlier period than has hitherto been supposed ...
... closely resemble or are even identical with those still existing . But this only throws far backwards the history of civi- lization , and shows that animals were domesticated at a much earlier period than has hitherto been supposed ...
21 페이지
... closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug - dog , or Blenheim spaniel , & c . — so unlike all wild Canidæ - ever existed freely in a state of nature ? It has often been loosely said that all our ...
... closely resembling the Italian greyhound , the bloodhound , the bull - dog , pug - dog , or Blenheim spaniel , & c . — so unlike all wild Canidæ - ever existed freely in a state of nature ? It has often been loosely said that all our ...
28 페이지
... closely related to each other , though it is unsupported by a single experiment . But to extend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should ...
... closely related to each other , though it is unsupported by a single experiment . But to extend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should ...
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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