The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - Всего страниц: 432 |
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Стр. xvi
... nearly depopulated at successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand ...
... nearly depopulated at successive periods , and then re - stocked ; and he gives as an alternative , that new forms may be generated " without the presence of any mould or germ of former aggregates . " I am not sure that I understand ...
Стр. 1
... nearly finished ; but as it will take me many more years to complete it , and as my health is far from strong , I have been urged to publish this Abstract . I have more especially been induced to do this , as Mr. Wallace , who is now ...
... nearly finished ; but as it will take me many more years to complete it , and as my health is far from strong , I have been urged to publish this Abstract . I have more especially been induced to do this , as Mr. Wallace , who is now ...
Стр. 6
... nearly uniform . The effects on the offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several genera- tions are ...
... nearly uniform . The effects on the offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several genera- tions are ...
Стр. 10
... nearly mature ; peculiarities in the silkworm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when ...
... nearly mature ; peculiarities in the silkworm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that , when ...
Стр. 13
... 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 fowl , Gallus bankiva ; and this is the ...
... 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 fowl , Gallus bankiva ; and this is the ...
Другие издания - Просмотреть все
The Origin of Species by Means of Natural Selection: Or, The ..., Том 1 Charles Darwin Полный просмотр - 1889 |
The Origin of Species by Means of Natural Selection: Or, the ..., Том 1 Charles Darwin Полный просмотр - 1898 |
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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