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
... namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of ...
... namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of ...
Página 3
... and gravest difficulties in accepting the theory will be given namely , first , the difficulties of transitions , or how a simple being or a simple organ can be changed and 2 Introduction . CHAPTER I VARIATION UNDER DOMESTICATION.
... and gravest difficulties in accepting the theory will be given namely , first , the difficulties of transitions , or how a simple being or a simple organ can be changed and 2 Introduction . CHAPTER I VARIATION UNDER DOMESTICATION.
Página 6
... namely , the nature of the organism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on ...
... namely , the nature of the organism , and the nature of the conditions . The former seems to be much the more important ; for nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on ...
Página 7
... namely , through the reproductive system being affected , we may infer that variability is thus induced , partly from the fact of this system being extremely sensitive to any change in the con- ditions , and partly from the similarity ...
... namely , through the reproductive system being affected , we may infer that variability is thus induced , partly from the fact of this system being extremely sensitive to any change in the con- ditions , and partly from the similarity ...
Página 11
... namely , that our domestic varieties , when run wild , gradually but invariably revert in charac- ter 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 charac- ter 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 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