The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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xvi 페이지
... 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 ...
1 페이지
... 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 ...
6 페이지
... 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 ...
8 페이지
... nearly the same variety for instance , buds on peach - trees producing nectarines , and buds on common roses producing moss - roses - we clearly see that the nature of the condition is of subordinate importance in comparison with the ...
... nearly the same variety for instance , buds on peach - trees producing nectarines , and buds on common roses producing moss - roses - we clearly see that the nature of the condition is of subordinate importance in comparison with the ...
10 페이지
... 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 ...
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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 fact 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 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