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 34
... action of the external conditions of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray- and race- horse , a greyhound and bloodhound , a carrier and tumbler ...
... action of the external conditions of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray- and race- horse , a greyhound and bloodhound , a carrier and tumbler ...
Página 49
... do not know , may be attributed to the definite action of the conditions of life . Some , perhaps a great , effect may be attributed The final re- to the increased use or disuse of. CHAP . I. ] 49 CIRCUMSTANCES FAVOURABLE .
... do not know , may be attributed to the definite action of the conditions of life . Some , perhaps a great , effect may be attributed The final re- to the increased use or disuse of. CHAP . I. ] 49 CIRCUMSTANCES FAVOURABLE .
Página 50
... action of Selection , whether applied method- ically and quickly , or unconsciously and slowly but more efficiently seems to have been the predominant Power . CHAPTER II . VARIATION UNDER NATURE . Variability Individual differences. 50 ...
... action of Selection , whether applied method- ically and quickly , or unconsciously and slowly but more efficiently seems to have been the predominant Power . CHAPTER II . VARIATION UNDER NATURE . Variability Individual differences. 50 ...
Página 65
... action of natural selection , hereafter to be explained , and to the effects of the increased use or disuse of parts . A well - marked variety may therefore be called an incipient species ; but whether this belief is justifiable must be ...
... action of natural selection , hereafter to be explained , and to the effects of the increased use or disuse of parts . A well - marked variety may therefore be called an incipient species ; but whether this belief is justifiable must be ...
Página 70
... action , more especially as we have every reason to believe the process of manufacturing new species to be a slow one . And this certainly holds true , if varieties be looked at as incipient species ; for my tables clearly show as a ...
... action , more especially as we have every reason to believe the process of manufacturing new species to be a slow one . And this certainly holds true , if varieties be looked at as incipient species ; for my tables clearly show as a ...
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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