The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página xvii
... means ' a process he knows not what . " " He amplifies this idea by adding that when such cases as that of the Red Grouse are " enumerated by the zoologist as evidence of distinct creation of the bird in and for such islands , he ...
... means ' a process he knows not what . " " He amplifies this idea by adding that when such cases as that of the Red Grouse are " enumerated by the zoologist as evidence of distinct creation of the bird in and for such islands , he ...
Página 4
... that species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of variability -. 4 INTRODUCTION .
... that species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of variability -. 4 INTRODUCTION .
Página 11
... mean , that , although differing from each other , and from other species of the same genus , in several trifling respects , they often differ in an extreme degree in some one part , both when compared one with another , and more ...
... mean , that , although differing from each other , and from other species of the same genus , in several trifling respects , they often differ in an extreme degree in some one part , both when compared one with another , and more ...
Página 21
... means of which he may summon into life whatever form and mould he pleases . " Lord Somerville , speak- ing of what breeders have done for sheep , says : - " It would seem as if they had chalked out upon a wall a form perfect in itself ...
... means of which he may summon into life whatever form and mould he pleases . " Lord Somerville , speak- ing of what breeders have done for sheep , says : - " It would seem as if they had chalked out upon a wall a form perfect in itself ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young