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 vi
... namely , intercrossing , isolation , number of individuals — Slow action - Extinction caused by Natural Se- lection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action ...
... namely , intercrossing , isolation , number of individuals — Slow action - Extinction caused by Natural Se- lection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action ...
Página 6
... 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 to what are called the same genera are lineal descendants of some other and ...
... 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 to what are called the same genera are lineal descendants of some other and ...
Página 8
... namely , the nature of the organ- ism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and ...
... namely , the nature of the organ- ism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and ...
Página 10
... namely , through the repro- ductive system being affected , we may infer that vari- ability is thus induced , partly from the fact of this system being extremely sensitive to any change in the conditions , and partly from the similarity ...
... namely , through the repro- ductive system being affected , we may infer that vari- ability is thus induced , partly from the fact of this system being extremely sensitive to any change in the conditions , and partly from the similarity ...
Página 16
... namely , that our domestic varieties , when run wild , gradually but invariably revert in character to their aboriginal stocks . Hence it has been argued that no deductions can be drawn from domestic races to species in a state of ...
... namely , that our domestic varieties , when run wild , gradually but invariably revert in character to their aboriginal stocks . Hence it has been argued that no deductions can be drawn from domestic races to species in a state of ...
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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