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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63개의 결과 중 1 - 5개
viii 페이지
... successive appearance of new species - On their different rates of change - Species once lost do not reappear - Groups of species follow the same general rules in their appearance and disappearance as do single species - On extinction ...
... successive appearance of new species - On their different rates of change - Species once lost do not reappear - Groups of species follow the same general rules in their appearance and disappearance as do single species - On extinction ...
xvi 페이지
... successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand some passages ; but it ...
... successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand some passages ; but it ...
20 페이지
... successive generations . May not those naturalists who , knowing far less of the laws of inheritance than does the breeder , and knowing no more than he does of the inter- mediate links in the long lines of descent , yet admit that many ...
... successive generations . May not those naturalists who , knowing far less of the laws of inheritance than does the breeder , and knowing no more than he does of the inter- mediate links in the long lines of descent , yet admit that many ...
21 페이지
... successive variations ; man adds them up in certain direc- tions useful to him . In this sense he may be said to have made for himself useful breeds . The great power of this principle of selection is not hypotheti- cal . It is certain ...
... successive variations ; man adds them up in certain direc- tions useful to him . In this sense he may be said to have made for himself useful breeds . The great power of this principle of selection is not hypotheti- cal . It is certain ...
22 페이지
... successive generations , of differences absolutely inappreciable by an uneducated eye - differences which I for one have vainly attempted to appreciate . Not one man in a thousand has accuracy of eye and judgment sufficient to become an ...
... successive generations , of differences absolutely inappreciable by an uneducated eye - differences which I for one have vainly attempted to appreciate . Not one man in a thousand has accuracy of eye and judgment sufficient to become an ...
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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