The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 1
... naturalist , I was much struck with certain facts in the distribution of the organic beings inhabiting South America , and in the geological relations of the present to the past in- habitants of that continent . These facts , as will be ...
... naturalist , I was much struck with certain facts in the distribution of the organic beings inhabiting South America , and in the geological relations of the present to the past in- habitants of that continent . These facts , as will be ...
Página 3
... naturalists , some of them personally unknown to me . I cannot , however , let this opportunity pass without expressing my deep obligations to Dr. Hooker , who , for the last fifteen years , has aided me in every possible way by his ...
... naturalists , some of them personally unknown to me . I cannot , however , let this opportunity pass without expressing my deep obligations to Dr. Hooker , who , for the last fifteen years , has aided me in every possible way by his ...
Página 4
... naturalists . From these considerations , I shall devote the first chapter of this Abstract to Variation under Domesti- cation . We shall thus see that a large amount of hereditary modification is at least possible ; and , what is ...
... naturalists . From these considerations , I shall devote the first chapter of this Abstract to Variation under Domesti- cation . We shall thus see that a large amount of hereditary modification is at least possible ; and , what is ...
Página 6
... naturalists until recently enter- tained , and which I formerly entertained - namely , that each species has been independently created - is errone- ous . I am fully convinced that species are not immuta- ble ; but that those belonging ...
... naturalists until recently enter- tained , and which I formerly entertained - namely , that each species has been independently created - is errone- ous . I am fully convinced that species are not immuta- ble ; but that those belonging ...
Página 11
... naturalists have maintained that all variations . are connected with the act of 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 ...
... naturalists have maintained that all variations . are connected with the act of 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 ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young