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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6 페이지
... probably would be modified in the same manner . Such facts as the 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 ...
... probably would be modified in the same manner . Such facts as the 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 ...
8 페이지
... probably another instance of the effects of use . Not one of our domestic animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ...
... probably another instance of the effects of use . Not one of our domestic animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ...
13 페이지
... probably for ever remain vague . But I may here state , that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have ...
... probably for ever remain vague . But I may here state , that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have ...
18 페이지
... probably quite correct , if applied to species 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 ...
... probably quite correct , if applied to species 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 ...
20 페이지
... that we see in them adaptation , not indeed to the animal's or plant's own good , but to man's use or fancy , Some variations useful to him have probably arisen sud- denly , or by one step ; many botanists , 20 [ CHAP . I. SELECTION BY MAN.
... that we see in them adaptation , not indeed to the animal's or plant's own good , but to man's use or fancy , Some variations useful to him have probably arisen sud- denly , or by one step ; many botanists , 20 [ CHAP . I. SELECTION BY MAN.
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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