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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87개의 결과 중 1 - 5개
vii 페이지
... Supposed incompetence of natural selection to account for the incipient stages of useful structures -Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed ...
... Supposed incompetence of natural selection to account for the incipient stages of useful structures -Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed ...
xii 페이지
... supposed incompetency of natural selection to account for the incipient stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures ...
... supposed incompetency of natural selection to account for the incipient stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures ...
xvii 페이지
... supposed " impulses " account in a scientific sense for the numerous and beautiful co - adaptations which we see throughout nature ; I cannot see that we thus gain any insight how , for instance , a woodpecker has become adapted to its ...
... supposed " impulses " account in a scientific sense for the numerous and beautiful co - adaptations which we see throughout nature ; I cannot see that we thus gain any insight how , for instance , a woodpecker has become adapted to its ...
xx 페이지
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circum- ambient molecules of a particular nature , and thus ...
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circum- ambient molecules of a particular nature , and thus ...
xxi 페이지
... suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the ... supposes the species living at any time to be the result of the gradual modification of pre - existing species a ...
... suppose that each species of animal and plant , or each great type of organisation , was formed and placed upon the ... supposes the species living at any time to be the result of the gradual modification of pre - existing species 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