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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86개의 결과 중 1 - 5개
v 페이지
... Causes of Variability - Effects of Habit and the use or disuse of Parts- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties ...
... Causes of Variability - Effects of Habit and the use or disuse of Parts- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties ...
vii 페이지
... Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed functions- Widely different organs in members of the same class , developed from one and the same source ...
... Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed functions- Widely different organs in members of the same class , developed from one and the same source ...
xii 페이지
... causes which prevent in many cases the acquisition through natural selection of useful structures . Lastly , reasons are given for disbelieving in great and sudden modifications . Gradations of character , often accompanied by changes ...
... causes which prevent in many cases the acquisition through natural selection of useful structures . Lastly , reasons are given for disbelieving in great and sudden modifications . Gradations of character , often accompanied by changes ...
xiv 페이지
... cause of change . He was cautious in drawing conclusions , and did not believe that existing species are now undergoing modifica- tion ; and , as his son adds , " C'est donc un problème à réserver * I have taken the date of the first ...
... cause of change . He was cautious in drawing conclusions , and did not believe that existing species are now undergoing modifica- tion ; and , as his son adds , " C'est donc un problème à réserver * I have taken the date of the first ...
xvii 페이지
... causes the orderly succession and progression of such organic phenomena may have been committed , we , as yet , are ignorant . " In his Address to the British Associa- tion , in 1858 , he speaks ( p . li ... Cause. HISTORICAL SKETCH . xvii.
... causes the orderly succession and progression of such organic phenomena may have been committed , we , as yet , are ignorant . " In his Address to the British Associa- tion , in 1858 , he speaks ( p . li ... Cause. HISTORICAL SKETCH . xvii.
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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