On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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82개의 결과 중 1 - 5개
xviii 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 two or three 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 B to do this , as Mr. Wallace , who ...
... nearly finished ; but as it will take me two or three 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 B to do this , as Mr. Wallace , who ...
8 페이지
... nearly uniform . The effects on the offspring are either definite or in- definite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modi ...
... nearly uniform . The effects on the offspring are either definite or in- definite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modi ...
9 페이지
... nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but mon- strosities cannot be separated by any distinct line from slighter variations . All such changes of structure ...
... nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but mon- strosities cannot be separated by any distinct line from slighter variations . All such changes of structure ...
11 페이지
... nearly the same variety - for instance , buds on peach - trees pro- ducing nectarines , and buds on common roses producing moss - roses - we clearly see that the nature of the con- ditions is of quite subordinate importance in ...
... nearly the same variety - for instance , buds on peach - trees pro- ducing nectarines , and buds on common roses producing moss - roses - we clearly see that the nature of the con- ditions is of quite subordinate importance in ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely