The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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viii 페이지
... follow the same general rules in their appearance and disappearance as do single species On Extinction . On simultaneous changes in the forms of life throughout the world - species to each other and to living species ment of ancient ...
... follow the same general rules in their appearance and disappearance as do single species On Extinction . On simultaneous changes in the forms of life throughout the world - species to each other and to living species ment of ancient ...
xvi 페이지
... follows : - " All species might have been varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; but farther on ( p . 18 ) he adds , “ except the original types or ancestors of ...
... follows : - " All species might have been varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; but farther on ( p . 18 ) he adds , “ except the original types or ancestors of ...
xvii 페이지
... follows : - " The archetypal idea was manifested in the flesh under diverse such modifications , upon this planet , long prior to the existence of those animal species that actually exemplify it . To what natural laws or secondary ...
... follows : - " The archetypal idea was manifested in the flesh under diverse such modifications , upon this planet , long prior to the existence of those animal species that actually exemplify it . To what natural laws or secondary ...
3 페이지
... follows from the high geometrical ratio of their increase , will be considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly ...
... follows from the high geometrical ratio of their increase , will be considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly ...
6 페이지
... 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 the nature of the sap . Indefinite variability is a ...
... 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 the nature of the sap . Indefinite variability is a ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young