The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, by Charles Darwin, with an Introduction by Edmund B. WilsonMacmillan, 1927 - 557 páginas |
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Página x
... favorable vari- ations will have an improved chance of surviving long enough to produce offspring and to transmit to them their advanta- geous traits . In this process , always at work as the ages passed , especially effective during ...
... favorable vari- ations will have an improved chance of surviving long enough to produce offspring and to transmit to them their advanta- geous traits . In this process , always at work as the ages passed , especially effective during ...
Página xv
... favorable ones to pass . The real creative agent , accordingly , is not selection but variation . The objection had at least the merit of directing attention more closely to the study of variation ; but how does it weaken the theory of ...
... favorable ones to pass . The real creative agent , accordingly , is not selection but variation . The objection had at least the merit of directing attention more closely to the study of variation ; but how does it weaken the theory of ...
Página xvii
... favorable ones . ' Of these traits we may read between the lines in all of Darwin's works . The " Origin of Species " in particular is more than a masterpiece of modern science . It is a human document which , as we turn its pages ...
... favorable ones . ' Of these traits we may read between the lines in all of Darwin's works . The " Origin of Species " in particular is more than a masterpiece of modern science . It is a human document which , as we turn its pages ...
Página xxxi
... favorable to Man's power of Selection 6 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 each ...
... favorable to Man's power of Selection 6 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 each ...
Página xxxii
... favorable and unfavorable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals Slow action - Extinction caused by Natural Selec- tion - Divergence of Character , related to the diversity of ...
... favorable and unfavorable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals Slow action - Extinction caused by Natural Selec- tion - Divergence of Character , related to the diversity of ...
Términos y frases comunes
adapted admit affinities allied species analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation formerly forms fossil Fritz Müller genera genus geological Glacial period gradations groups of species habits Hence hybrids hybrids produced 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 organs Origin of Species parent peculiar perfect pigeon pistil pollen present principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend tion trees variability variations varieties vary whole widely different wings young