The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página v
... favourable to Man's power of Selection 7 CHAPTER II . VARIATION UNDER NATURE . Variability - Individual differences - Doubtful species - Wide rang- ing , much diffused , and common species , vary most - Species of the larger genera in ...
... favourable to Man's power of Selection 7 CHAPTER II . VARIATION UNDER NATURE . Variability - Individual differences - Doubtful species - Wide rang- ing , much diffused , and common species , vary most - Species of the larger genera in ...
Página vi
... favourable and unfavourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Se- lection - Divergence of Character , related to the diversity ...
... favourable and unfavourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Se- lection - Divergence of Character , related to the diversity ...
Página 7
... favourable to Man's power of Selection . Causes of Variability . WHEN we compare the individuals of the same vari- ety or sub - variety of our older cultivated plants and ani- mals , one of the first points which strikes us is , that ...
... favourable to Man's power of Selection . Causes of Variability . WHEN we compare the individuals of the same vari- ety or sub - variety of our older cultivated plants and ani- mals , one of the first points which strikes us is , that ...
Página 32
... favourable circumstance for the production of distinct breeds , that male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of ...
... favourable circumstance for the production of distinct breeds , that male and female pigeons can be easily mated for life ; and thus different breeds can be kept together in the same aviary . I have discussed the probable origin of ...
Página 46
... favourable to Man's Power of Selection . I will now say a few words on the circumstances , favourable , or the reverse , to man's power of selection . A high degree of variability is obviously favourable , as freely giving the materials ...
... favourable to Man's Power of Selection . I will now say a few words on the circumstances , favourable , or the reverse , to man's power of selection . A high degree of variability is obviously favourable , as freely giving the materials ...
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Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young