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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69개의 결과 중 1 - 5개
vi 페이지
... descendants from a common parent - Explains the grouping of all organic beings - Advance in organisation - Low forms preserved - Convergence of Character- Indefinite multiplication of species - Summary 57 CHAPTER V. LAWS OF VARIATION ...
... descendants from a common parent - Explains the grouping of all organic beings - Advance in organisation - Low forms preserved - Convergence of Character- Indefinite multiplication of species - Summary 57 CHAPTER V. LAWS OF VARIATION ...
xiii 페이지
... descendants by true generation of pre - exist- ing forms . Passing over allusions to the subject in the classical writers , * the first author who in modern times has treated it in a scientific spirit was Buffon . But as his opinions ...
... descendants by true generation of pre - exist- ing forms . Passing over allusions to the subject in the classical writers , * the first author who in modern times has treated it in a scientific spirit was Buffon . But as his opinions ...
xx 페이지
... descendants through continued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( ' Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , “ On voit que nos recherches sur la fixité ou la variation de l'espèce ...
... descendants through continued reproduction . " A well - known French botanist , M. Lecoq , writes in 1854 ( ' Etudes sur Géograph . Bot . , ' tom . i . p . 250 ) , “ On voit que nos recherches sur la fixité ou la variation de l'espèce ...
4 페이지
... descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection has been the most ...
... descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection has been the most ...
11 페이지
... descendants of aboriginally distinct species , and by other competent judges as mere varieties . If any well - marked distinction existed between a domestic race and a species , this source of doubt would not so perpetually recur . It ...
... descendants of aboriginally distinct species , and by other competent judges as mere varieties . If any well - marked distinction existed between a domestic race and a species , this source of doubt would not so perpetually recur . It ...
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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