On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página vi
... favourable and unfa- vourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection - Divergence of Character , related to the diversity ...
... favourable and unfa- vourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection - Divergence of Character , related to the diversity ...
Página 3
... favourable to variation . In the next chapter the Struggle for Existence amongst all organic beings throughout the world , which inevitably follows from the high geometrical ratio of their increase , will be considered . This is the ...
... favourable to variation . In the next chapter the Struggle for Existence amongst all organic beings throughout the world , which inevitably follows from the high geometrical ratio of their increase , will be considered . This is the ...
Página 21
... favourable circumstance for the production of dis- tinct 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 dis- tinct 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 29
... 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 vari- ability is obviously favourable , as freely giving the ...
... 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 vari- ability is obviously favourable , as freely giving the ...
Página 30
... reared and a large stock not kept : in geese , from being valuable only or two purposes , food and feathers , and more especially from no pleasure having been felt in the display 30 Circumstances favourable to Selection . CHAP . L.
... reared and a large stock not kept : in geese , from being valuable only or two purposes , food and feathers , and more especially from no pleasure having been felt in the display 30 Circumstances favourable to Selection . CHAP . L.
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Términos y frases comunes
adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young