The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página xviii
... nearly de- populated 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 de- populated 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 ...
Página 1
... same object . I hope that I may be ex- cused for entering on these personal details , as I give them to show that I have not been hasty in coming to a decision . My work is now ( 1859 ) nearly finished ;. 1 INTRODUCTION.
... same object . I hope that I may be ex- cused for entering on these personal details , as I give them to show that I have not been hasty in coming to a decision . My work is now ( 1859 ) nearly finished ;. 1 INTRODUCTION.
Página 2
... 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 ...
Página 8
... nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring ...
... nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring ...
Página 9
... nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities 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 monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure ...
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Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young