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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viii 페이지
... living species - On the state of development of ancient forms -On the succession of the same types within the same areas - Summary of preceding and present chapter CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . 272 Present distribution ...
... living species - On the state of development of ancient forms -On the succession of the same types within the same areas - Summary of preceding and present chapter CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . 272 Present distribution ...
xvii 페이지
... living things . " Farther on ( p . xc . ) , after referring to geographical dis- tribution , he adds , " These phenomena shake our confidence in the conclusion that the Apteryx of New Zealand and the Red Grouse of England were distinct ...
... living things . " Farther on ( p . xc . ) , after referring to geographical dis- tribution , he adds , " These phenomena shake our confidence in the conclusion that the Apteryx of New Zealand and the Red Grouse of England were distinct ...
xx 페이지
... living plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through continued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( ' Etudes sur ...
... living plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through continued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( ' Etudes sur ...
xxi 페이지
... living at any time to be the result of the gradual modification of pre - existing species a hypothesis which , though unproven , and sadly damaged by some of its sup- porters , is yet the only one to which physiology lends any counte ...
... living at any time to be the result of the gradual modification of pre - existing species a hypothesis which , though unproven , and sadly damaged by some of its sup- porters , is yet the only one to which physiology lends any counte ...
6 페이지
... living together , may be considered as the indefinite effects of the conditions of life on each individual organism , in nearly the same manner as the chill affects different men in an indefinite manner , according to their state of ...
... living together , may be considered as the indefinite effects of the conditions of life on each individual organism , in nearly the same manner as the chill affects different men in an indefinite manner , according to their state 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 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