The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1895 - 432페이지 |
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vi 페이지
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at al ! ages and on both sexes - Sexual selection - On the generality ...
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at al ! ages and on both sexes - Sexual selection - On the generality ...
vii 페이지
... sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary .. . Page 164 CHAPTER VI . DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with ...
... sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary .. . Page 164 CHAPTER VI . DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with ...
11 페이지
... sexual reproduction ; but this is certainly an error ; for I have given in another work a long list of " sporting plants , " as they are called by gardeners ; —that is , of plants which have suddenly produced a single bud with a new and ...
... sexual reproduction ; but this is certainly an error ; for I have given in another work a long list of " sporting plants , " as they are called by gardeners ; —that is , of plants which have suddenly produced a single bud with a new and ...
97 페이지
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual Selection - On the generality ...
... SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual Selection - On the generality ...
107 페이지
... hereditarily attached to that sex , so no doubt it will be under nature . Thus it is rendered possible for the two sexes to be modified through natural selection in relation to different habits of life. CHAP . IV . ] 107 SEXUAL SELECTION .
... hereditarily attached to that sex , so no doubt it will be under nature . Thus it is rendered possible for the two sexes to be modified through natural selection in relation to different habits of life. CHAP . IV . ] 107 SEXUAL SELECTION .
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adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced 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 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 theory tion trees variability variations varieties vary whilst whole wings young