The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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4 페이지
... belonging to what are called the same genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I ...
... belonging to what are called the same genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I ...
12 페이지
... belonging to equally diverse classes and countries , were taken from a state of nature , and could be made to breed for an equal number of generations under domestication , they would on an average vary as largely as the parent species ...
... belonging to equally diverse classes and countries , were taken from a state of nature , and could be made to breed for an equal number of generations under domestication , they would on an average vary as largely as the parent species ...
13 페이지
... belong to the same species . Having kept nearly all the English breeds of the fowl alive , having bred and crossed them , and examined their skeletons , it appears to me almost certain that all are the descend- ants of the wild Indian ...
... belong to the same species . Having kept nearly all the English breeds of the fowl alive , having bred and crossed them , and examined their skeletons , it appears to me almost certain that all are the descend- ants of the wild Indian ...
17 페이지
... belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To give one instance out of several ...
... belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To give one instance out of several ...
28 페이지
... belong to poor people , and are mostly in small lots , they never can be improved . " On the other hand , nurserymen , from keeping large stocks of the same plant , are generally far more successful than amateurs in raising new and ...
... belong to poor people , and are mostly in small lots , they never can be improved . " On the other hand , nurserymen , from keeping large stocks of the same plant , are generally far more successful than amateurs in raising new and ...
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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