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 vi
... important of all relations .. Page 44 CHAPTER IV . NATURAL SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages ...
... important of all relations .. Page 44 CHAPTER IV . NATURAL SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages ...
Página 4
... importance , for they determine the present welfare , and , as I believe , the future success and modification of every ... important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of ...
... importance , for they determine the present welfare , and , as I believe , the future success and modification of every ... important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of ...
Página 6
... important ; for nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on ...
... important ; for nearly similar variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on ...
Página 8
... importance in comparison with the nature of the organism in determining each particular form of variation ; -perhaps ... Important changes in the embryo or larva will probably entail changes in the mature animal . In monstrosities , the ...
... importance in comparison with the nature of the organism in determining each particular form of variation ; -perhaps ... Important changes in the embryo or larva will probably entail changes in the mature animal . In monstrosities , the ...
Página 10
... importance to us , that peculiarities appearing in the males of our domestic breeds are often transmitted , either exclu- sively or in a much greater degree , to the males alone . A much more important rule , which I think may be ...
... importance to us , that peculiarities appearing in the males of our domestic breeds are often transmitted , either exclu- sively or in a much greater degree , to the males alone . A much more important rule , which I think may be ...
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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