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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viii 페이지
... present chapter .. CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . 272 Present distribution cannot be accounted for by differences in physical con- ditions - Importance of barriers - Affinity of the productions of the same continent - Centres ...
... present chapter .. CHAPTER XII . GEOGRAPHICAL DISTRIBUTION . 272 Present distribution cannot be accounted for by differences in physical con- ditions - Importance of barriers - Affinity of the productions of the same continent - Centres ...
1 페이지
... present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mystery of mysteries , as it has been called by one of ...
... present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mystery of mysteries , as it has been called by one of ...
4 페이지
... present welfare , and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of the mutual relations of the innumerable inhabitants of the world during the many past geological ...
... present welfare , and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of the mutual relations of the innumerable inhabitants of the world during the many past geological ...
12 페이지
... present empirical . When it is explained how genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races . In attempting to estimate the amount ...
... present empirical . When it is explained how genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races . In attempting to estimate the amount ...
13 페이지
... present day there is hardly a tribe so barbarous , as not to have domesticated at least the dog . The origin of most of our domestic animals will probably for ever remain vague . But I may here state , that , looking to the domestic ...
... present day there is hardly a tribe so barbarous , as not to have domesticated at least the dog . The origin of most of our domestic animals will probably for ever remain vague . But I may here state , that , looking to the domestic ...
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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