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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52개의 결과 중 1 - 5개
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 - On the affinities of extinct species to each other and to ...
... 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 - On the affinities of extinct species to each other and to ...
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 ...
... 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 ...
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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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