The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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62개의 결과 중 1 - 5개
v 페이지
... in a wide sense - Geometrical ratio of increase - Rapid increase of naturalised animals and plants- Nature of the checks to increase - Competition universal - Effects of climate - Protection from the number of individuals - Complex.
... in a wide sense - Geometrical ratio of increase - Rapid increase of naturalised animals and plants- Nature of the checks to increase - Competition universal - Effects of climate - Protection from the number of individuals - Complex.
vi 페이지
... Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of the same genus - The relation of organism to organism ...
... Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of the same genus - The relation of organism to organism ...
ix 페이지
... complex , and radiating - Extinction separates and defines groups - MORPHOLOGY , be- tween members of the same class , between parts of the same individual- EMBRYOLOGY , laws of , explained by variations not supervening at any early age ...
... complex , and radiating - Extinction separates and defines groups - MORPHOLOGY , be- tween members of the same class , between parts of the same individual- EMBRYOLOGY , laws of , explained by variations not supervening at any early age ...
3 페이지
... complex and sometimes varying con- ditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will tend to propagate its new and modified ...
... complex and sometimes varying con- ditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will tend to propagate its new and modified ...
6 페이지
... complex and extraordinary out - growths which variably follow from the insertion of a minute drop of poison by a gall - producing insect , show us what singular modifications might result in the case of plants from a chemical change in ...
... complex and extraordinary out - growths which variably follow from the insertion of a minute drop of poison by a gall - producing insect , show us what singular modifications might result in the case of plants from a chemical change 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 facts 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 occur 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